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authorJim Hahn <jrh3@att.com>2019-02-06 13:14:57 -0500
committerJim Hahn <jrh3@att.com>2019-02-08 17:18:45 -0500
commit4ec725ef0905cd5490ed71b6576fdc1ef8fef17e (patch)
tree45fa7a22bbb586b3c6bf3821dcd4618403dbe9e5 /gson/src/main/java/org
parent7f1be8710503b4c34a49c96be8a6818757499bd6 (diff)
Add superclasses for gson-jackson migration
Added common classes needed by other gson-jackson code. Modified some logic to make it more maintainable or perform better. Updated comments and spacing. Fix another comment. Moved gson classes from utils to a separate gson project. Added GsonXxx annotations to mirror jackson annotations. Removed unneeded dependencies from gson pom. Removed old GsonMessage class from policy-endpoints. Removed trailing spaces. Updated licenses. Removed more trailing spaces. Removed unneeded checkstyle suppression file from utils. Change-Id: I1a285500faeb0a0b6a1467d09b92ecd3cded713e Issue-ID: POLICY-1428 Signed-off-by: Jim Hahn <jrh3@att.com>
Diffstat (limited to 'gson/src/main/java/org')
-rw-r--r--gson/src/main/java/org/onap/policy/common/gson/GsonMessageBodyHandler.java124
-rw-r--r--gson/src/main/java/org/onap/policy/common/gson/JacksonExclusionStrategy.java104
-rw-r--r--gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonAnyGetter.java38
-rw-r--r--gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonAnySetter.java38
-rw-r--r--gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonIgnore.java39
-rw-r--r--gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonProperty.java44
-rw-r--r--gson/src/main/java/org/onap/policy/common/gson/internal/Adapter.java339
-rw-r--r--gson/src/main/java/org/onap/policy/common/gson/internal/ClassWalker.java389
-rw-r--r--gson/src/main/java/org/onap/policy/common/gson/internal/Deserializer.java39
9 files changed, 1154 insertions, 0 deletions
diff --git a/gson/src/main/java/org/onap/policy/common/gson/GsonMessageBodyHandler.java b/gson/src/main/java/org/onap/policy/common/gson/GsonMessageBodyHandler.java
new file mode 100644
index 00000000..2112c97c
--- /dev/null
+++ b/gson/src/main/java/org/onap/policy/common/gson/GsonMessageBodyHandler.java
@@ -0,0 +1,124 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.gson;
+
+import com.google.gson.Gson;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Type;
+import java.nio.charset.StandardCharsets;
+import javax.ws.rs.Consumes;
+import javax.ws.rs.Produces;
+import javax.ws.rs.WebApplicationException;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.MultivaluedMap;
+import javax.ws.rs.ext.MessageBodyReader;
+import javax.ws.rs.ext.MessageBodyWriter;
+import javax.ws.rs.ext.Provider;
+
+/**
+ * Provider that serializes and de-serializes JSON via gson.
+ */
+@Provider
+@Consumes(MediaType.WILDCARD)
+@Produces(MediaType.WILDCARD)
+public class GsonMessageBodyHandler implements MessageBodyReader<Object>, MessageBodyWriter<Object> {
+
+ /**
+ * Object to be used to serialize and de-serialize.
+ */
+ private Gson gson;
+
+ /**
+ * Constructs the object, using a plain Gson object.
+ */
+ public GsonMessageBodyHandler() {
+ this(new Gson());
+ }
+
+ /**
+ * Constructs the object.
+ *
+ * @param gson the Gson object to be used to serialize and de-serialize
+ */
+ public GsonMessageBodyHandler(Gson gson) {
+ this.gson = gson;
+ }
+
+ @Override
+ public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
+ return canHandle(mediaType);
+ }
+
+ @Override
+ public long getSize(Object object, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
+ return -1;
+ }
+
+ @Override
+ public void writeTo(Object object, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType,
+ MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
+ throws IOException, WebApplicationException {
+
+ try (OutputStreamWriter writer = new OutputStreamWriter(entityStream, StandardCharsets.UTF_8)) {
+ Type jsonType = (type.equals(genericType) ? type : genericType);
+ gson.toJson(object, jsonType, writer);
+ }
+ }
+
+ @Override
+ public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
+ return canHandle(mediaType);
+ }
+
+ /**
+ * Determines if this provider can handle the given media type.
+ *
+ * @param mediaType the media type of interest
+ * @return {@code true} if this provider handles the given media type, {@code false}
+ * otherwise
+ */
+ private boolean canHandle(MediaType mediaType) {
+ if (mediaType == null) {
+ return true;
+ }
+
+ String subtype = mediaType.getSubtype();
+
+ return "json".equalsIgnoreCase(subtype) || subtype.endsWith("+json") || "javascript".equals(subtype)
+ || "x-javascript".equals(subtype) || "x-json".equals(subtype);
+ }
+
+ @Override
+ public Object readFrom(Class<Object> type, Type genericType, Annotation[] annotations, MediaType mediaType,
+ MultivaluedMap<String, String> httpHeaders, InputStream entityStream)
+ throws IOException, WebApplicationException {
+
+ try (InputStreamReader streamReader = new InputStreamReader(entityStream, StandardCharsets.UTF_8)) {
+ Type jsonType = (type.equals(genericType) ? type : genericType);
+ return gson.fromJson(streamReader, jsonType);
+ }
+ }
+}
diff --git a/gson/src/main/java/org/onap/policy/common/gson/JacksonExclusionStrategy.java b/gson/src/main/java/org/onap/policy/common/gson/JacksonExclusionStrategy.java
new file mode 100644
index 00000000..cb959c43
--- /dev/null
+++ b/gson/src/main/java/org/onap/policy/common/gson/JacksonExclusionStrategy.java
@@ -0,0 +1,104 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.gson;
+
+import com.google.gson.ExclusionStrategy;
+import com.google.gson.FieldAttributes;
+import com.google.gson.JsonElement;
+import java.lang.reflect.GenericArrayType;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Excludes all fields from serialization/deserialization, if the class is managed.
+ */
+public class JacksonExclusionStrategy implements ExclusionStrategy {
+
+ /**
+ * Classes that are explicitly not managed by the GSON jackson adapters.
+ */
+ // @formatter:off
+ private static final Set<Class<?>> unmanaged = new HashSet<>(Arrays.asList(
+ boolean.class,
+ byte.class,
+ short.class,
+ int.class,
+ long.class,
+ float.class,
+ double.class,
+ char.class,
+ Boolean.class,
+ Byte.class,
+ Short.class,
+ Integer.class,
+ Long.class,
+ Float.class,
+ Double.class,
+ Character.class,
+ String.class));
+ // @formatter:on
+
+ /**
+ * Classes whose subclasses are explicitly not managed by the GSON jackson adapters.
+ */
+ // @formatter:off
+ private static final Set<Class<?>> unmanagedSuper = new HashSet<>(Arrays.asList(
+ GenericArrayType.class,
+ Map.class,
+ Collection.class,
+ JsonElement.class));
+ // @formatter:on
+
+ @Override
+ public boolean shouldSkipField(FieldAttributes attrs) {
+ return isManaged(attrs.getDeclaringClass());
+ }
+
+ @Override
+ public boolean shouldSkipClass(Class<?> clazz) {
+ return false;
+ }
+
+ /**
+ * Determines if a class is managed by this adapter, which typically means that it is
+ * <i>not</i> a generic class such as {@link JsonElement} or some type of collection.
+ *
+ * @param clazz the class to be examined
+ * @return {@code true} if the class is managed by this adapter, {@code false}
+ * otherwise
+ */
+ public static boolean isManaged(Class<?> clazz) {
+ if (clazz.isArray() || clazz.isEnum() || clazz.isPrimitive() || unmanaged.contains(clazz)) {
+ return false;
+ }
+
+ for (Class<?> sup : unmanagedSuper) {
+ if (sup.isAssignableFrom(clazz)) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+}
diff --git a/gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonAnyGetter.java b/gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonAnyGetter.java
new file mode 100644
index 00000000..859f5386
--- /dev/null
+++ b/gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonAnyGetter.java
@@ -0,0 +1,38 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.gson.annotation;
+
+import static java.lang.annotation.ElementType.METHOD;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+/**
+ * Mimics Jackson JsonAnyGetter annotation, but used by gson. This requires the gson
+ * object to be configured with the jackson default behaviors (i.e., the associated
+ * JacksonXxx strategy and adapters must be registered with the gson object).
+ */
+@Retention(RUNTIME)
+@Target(METHOD)
+public @interface GsonJsonAnyGetter {
+
+}
diff --git a/gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonAnySetter.java b/gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonAnySetter.java
new file mode 100644
index 00000000..87e0f330
--- /dev/null
+++ b/gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonAnySetter.java
@@ -0,0 +1,38 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.gson.annotation;
+
+import static java.lang.annotation.ElementType.METHOD;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+/**
+ * Mimics Jackson JsonAnySetter annotation, but used by gson. This requires the gson
+ * object to be configured with the jackson default behaviors (i.e., the associated
+ * JacksonXxx strategy and adapters must be registered with the gson object).
+ */
+@Retention(RUNTIME)
+@Target(METHOD)
+public @interface GsonJsonAnySetter {
+
+}
diff --git a/gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonIgnore.java b/gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonIgnore.java
new file mode 100644
index 00000000..cf2d4394
--- /dev/null
+++ b/gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonIgnore.java
@@ -0,0 +1,39 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.gson.annotation;
+
+import static java.lang.annotation.ElementType.FIELD;
+import static java.lang.annotation.ElementType.METHOD;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+/**
+ * Mimics Jackson JsonIgnore annotation, but used by gson. This requires the gson object
+ * to be configured with the jackson default behaviors (i.e., the associated JacksonXxx
+ * strategy and adapters must be registered with the gson object).
+ */
+@Retention(RUNTIME)
+@Target({FIELD, METHOD})
+public @interface GsonJsonIgnore {
+
+}
diff --git a/gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonProperty.java b/gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonProperty.java
new file mode 100644
index 00000000..c31c19bb
--- /dev/null
+++ b/gson/src/main/java/org/onap/policy/common/gson/annotation/GsonJsonProperty.java
@@ -0,0 +1,44 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.gson.annotation;
+
+import static java.lang.annotation.ElementType.FIELD;
+import static java.lang.annotation.ElementType.METHOD;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+/**
+ * Mimics Jackson JsonProperty annotation, but used by gson. This requires the gson object
+ * to be configured with the jackson default behaviors (i.e., the associated JacksonXxx
+ * strategy and adapters must be registered with the gson object).
+ */
+@Retention(RUNTIME)
+@Target({FIELD, METHOD})
+public @interface GsonJsonProperty {
+
+ /**
+ * Property name of this item when placed into a JsonObject.
+ * @return the item's serialized name
+ */
+ String value() default "";
+}
diff --git a/gson/src/main/java/org/onap/policy/common/gson/internal/Adapter.java b/gson/src/main/java/org/onap/policy/common/gson/internal/Adapter.java
new file mode 100644
index 00000000..b4ef53f7
--- /dev/null
+++ b/gson/src/main/java/org/onap/policy/common/gson/internal/Adapter.java
@@ -0,0 +1,339 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.gson.internal;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonElement;
+import com.google.gson.TypeAdapter;
+import com.google.gson.reflect.TypeToken;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.lang.reflect.Type;
+import java.util.function.Supplier;
+import java.util.regex.Pattern;
+import org.onap.policy.common.gson.annotation.GsonJsonProperty;
+
+/**
+ * Super class of adapters used to serialize and de-serialize an item.
+ */
+public class Adapter {
+
+ /**
+ * Pattern to match valid identifiers.
+ */
+ private static final Pattern VALID_NAME_PAT = Pattern.compile("[a-zA-Z_]\\w*");
+
+ /**
+ * Name of the property within the json structure containing the item.
+ */
+ private final String propName;
+
+ /**
+ * Gson object that will provide the type converter.
+ */
+ private final Gson gson;
+
+ /**
+ * Converter used when reading.
+ */
+ private final ConvInfo reader;
+
+ /**
+ * Converter used when writing, allocated lazily, once an actual type is determined.
+ */
+ private volatile ConvInfo writer = null;
+
+ /**
+ * Name of the item being lifted - used when throwing exceptions.
+ */
+ private final String fullName;
+
+ /**
+ * Constructs the object.
+ *
+ * @param gson Gson object providing type adapters
+ * @param field field used to access the item from within an object
+ */
+ public Adapter(Gson gson, Field field) {
+ this.propName = detmPropName(field);
+ this.reader = new ConvInfo(TypeToken.get(field.getGenericType()));
+ this.gson = gson;
+ this.fullName = getQualifiedName(field);
+
+ field.setAccessible(true);
+ }
+
+ /**
+ * Constructs the object.
+ *
+ * @param gson Gson object providing type adapters
+ * @param accessor method used to access the item from within an object
+ * @param forGetter {@code true} if the name is for a "getter" method, {@code false}
+ * if for a "setter"
+ * @param valueType the class of value on which this operates
+ */
+ public Adapter(Gson gson, Method accessor, boolean forGetter, Type valueType) {
+ this.propName = (forGetter ? detmGetterPropName(accessor) : detmSetterPropName(accessor));
+ this.reader = new ConvInfo(TypeToken.get(valueType));
+ this.gson = gson;
+ this.fullName = getQualifiedName(accessor);
+
+ accessor.setAccessible(true);
+ }
+
+ /**
+ * Converts an object to a json tree.
+ *
+ * @param object the object to be converted
+ * @return a json tree representing the object
+ */
+ @SuppressWarnings("unchecked")
+ public JsonElement toJsonTree(Object object) {
+ // always use a converter for the specific subclass
+ Class<? extends Object> clazz = object.getClass();
+
+ if (writer == null) {
+ // race condition here, but it's ok to overwrite a previous value
+ writer = new ConvInfo(TypeToken.get(clazz));
+ }
+
+ ConvInfo wtr = writer;
+ TypeAdapter<Object> conv =
+ (TypeAdapter<Object>) (wtr.clazz == clazz ? wtr.getConverter() : gson.getAdapter(clazz));
+
+ return conv.toJsonTree(object);
+ }
+
+ /**
+ * Converts a json tree to an object.
+ *
+ * @param tree the tree to be converted
+ * @return the object represented by the tree
+ */
+ public Object fromJsonTree(JsonElement tree) {
+ return reader.getConverter().fromJsonTree(tree);
+ }
+
+ public final String getPropName() {
+ return propName;
+ }
+
+ public final String getFullName() {
+ return fullName;
+ }
+
+ /**
+ * Makes an error message, appending the item's full name to the message prefix.
+ *
+ * @param prefix the message prefix
+ * @return the error message
+ */
+ public String makeError(String prefix) {
+ return (prefix + fullName);
+ }
+
+ /**
+ * Determines if the field is managed by the walker.
+ *
+ * @param field the field to examine
+ * @return {@code true} if the field is managed by the walker, {@code false} otherwise
+ */
+ public static boolean isManaged(Field field) {
+ return VALID_NAME_PAT.matcher(field.getName()).matches();
+ }
+
+ /**
+ * Determines if the method is managed by the walker.
+ *
+ * @param method the method to examine
+ * @return {@code true} if the method is managed by the walker, {@code false}
+ * otherwise
+ */
+ public static boolean isManaged(Method method) {
+ return VALID_NAME_PAT.matcher(method.getName()).matches();
+ }
+
+ /**
+ * Determines the property name of an item within the json structure.
+ *
+ * @param field the item within the object
+ * @return the json property name for the item or {@code null} if the name is invalid
+ */
+ public static String detmPropName(Field field) {
+ // use the serialized name, if specified
+ GsonJsonProperty prop = field.getAnnotation(GsonJsonProperty.class);
+ if (prop != null && !prop.value().isEmpty()) {
+ return prop.value();
+ }
+
+ // no name provided - use it as is
+ return (isManaged(field) ? field.getName() : null);
+ }
+
+ /**
+ * Determines the property name of an item, within the json structure, associated with
+ * a "get" method.
+ *
+ * @param method method to be invoked to get the item within the object
+ * @return the json property name for the item, or {@code null} if the method name is
+ * not valid
+ */
+ public static String detmGetterPropName(Method method) {
+
+ return detmPropNameCommon(method, () -> {
+
+ if (!isManaged(method)) {
+ return null;
+ }
+
+ String name = method.getName();
+
+ if (name.startsWith("get")) {
+ return name.substring(3);
+
+ } else if (name.startsWith("is")) {
+ Class<?> treturn = method.getReturnType();
+
+ if (treturn == boolean.class || treturn == Boolean.class) {
+ return name.substring(2);
+ }
+ }
+
+ // not a valid name for a "getter" method
+ return null;
+ });
+ }
+
+ /**
+ * Determines the property name of an item, within the json structure, associated with
+ * a "set" method.
+ *
+ * @param method method to be invoked to set the item within the object
+ * @return the json property name for the item, or {@code null} if the method name is
+ * not valid
+ */
+ public static String detmSetterPropName(Method method) {
+
+ return detmPropNameCommon(method, () -> {
+
+ if (!isManaged(method)) {
+ return null;
+ }
+
+ String name = method.getName();
+
+ if (name.startsWith("set")) {
+ return name.substring(3);
+ }
+
+ // not a valid name for a "setter" method
+ return null;
+ });
+ }
+
+ /**
+ * Determines the property name of an item within the json structure.
+ *
+ * @param method method to be invoked to get/set the item within the object
+ * @param extractor function to extract the name directly from the method name
+ * @return the json property name for the item, or {@code null} if the method name is
+ * not valid
+ */
+ private static String detmPropNameCommon(Method method, Supplier<String> extractor) {
+
+ // use the property name, if specified
+ GsonJsonProperty propName = method.getAnnotation(GsonJsonProperty.class);
+ if (propName != null && !propName.value().isEmpty()) {
+ return propName.value();
+ }
+
+ // no name provided - must compute it from the method name
+ String name = extractor.get();
+
+ if (name == null || name.isEmpty()) {
+ // nothing left after stripping the prefix - invalid name
+ return null;
+ }
+
+ // translate the first letter to lower-case
+ return name.substring(0, 1).toLowerCase() + name.substring(1);
+ }
+
+ /**
+ * Gets the fully qualified name of a field.
+ *
+ * @param field field whose name is desired
+ * @return the field fully qualified name
+ */
+ public static String getQualifiedName(Field field) {
+ return (field.getDeclaringClass().getName() + "." + field.getName());
+ }
+
+ /**
+ * Gets the fully qualified name of a method.
+ *
+ * @param method method whose name is desired
+ * @return the method's fully qualified name
+ */
+ public static String getQualifiedName(Method method) {
+ return (method.getDeclaringClass().getName() + "." + method.getName());
+ }
+
+ /**
+ * Converter info.
+ */
+ private class ConvInfo {
+
+ /**
+ * Type on which the converter works.
+ */
+ private TypeToken<?> type;
+
+ /**
+ * Class of object on which the converter works.
+ */
+ private Class<?> clazz;
+
+ /**
+ * Converter to use, initialized lazily.
+ */
+ private volatile TypeAdapter<?> conv = null;
+
+ /**
+ * Constructs the object.
+ *
+ * @param type type of object to be converted
+ */
+ public ConvInfo(TypeToken<?> type) {
+ this.type = type;
+ this.clazz = type.getRawType();
+ }
+
+ public final TypeAdapter<?> getConverter() {
+ if (conv == null) {
+ // race condition here, but it's ok to overwrite a previous value
+ this.conv = gson.getAdapter(type);
+ }
+
+ return conv;
+ }
+ }
+}
diff --git a/gson/src/main/java/org/onap/policy/common/gson/internal/ClassWalker.java b/gson/src/main/java/org/onap/policy/common/gson/internal/ClassWalker.java
new file mode 100644
index 00000000..e985d98a
--- /dev/null
+++ b/gson/src/main/java/org/onap/policy/common/gson/internal/ClassWalker.java
@@ -0,0 +1,389 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.gson.internal;
+
+import com.google.gson.JsonParseException;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import org.onap.policy.common.gson.annotation.GsonJsonAnyGetter;
+import org.onap.policy.common.gson.annotation.GsonJsonAnySetter;
+import org.onap.policy.common.gson.annotation.GsonJsonIgnore;
+import org.onap.policy.common.gson.annotation.GsonJsonProperty;
+
+/**
+ * Data populated while walking the hierarchy of a class.
+ */
+public class ClassWalker {
+
+ public static final String ANY_GETTER_MISMATCH_ERR =
+ GsonJsonAnyGetter.class.getSimpleName() + " parameter mismatch for: ";
+
+ public static final String ANY_SETTER_MISMATCH_ERR =
+ GsonJsonAnySetter.class.getSimpleName() + " parameter mismatch for: ";
+
+ public static final String ANY_SETTER_TYPE_ERR =
+ GsonJsonAnySetter.class.getSimpleName() + " first parameter must be a string: ";
+
+ /**
+ * Maps an input property name to an item within the class, where item is one of:
+ * {@link Field}, {@link Method}, or {@code null}. Entries are overwritten as new
+ * items are added.
+ */
+ private final Map<String, Object> inProps = new HashMap<>();
+
+ /**
+ * Maps an output property name to an item within the class, where item is one of:
+ * {@link Field}, {@link Method}, or {@code null}. Entries are overwritten as new
+ * items are added.
+ */
+ private final Map<String, Object> outProps = new HashMap<>();
+
+ /**
+ * Maps a method name to a "get" method. Used when overriding properties associated
+ * with a method.
+ */
+ private final Map<String, Method> getters = new HashMap<>();
+
+ /**
+ * Maps a method name to a "set" method. Used when overriding properties associated
+ * with a method.
+ */
+ private final Map<String, Method> setters = new HashMap<>();
+
+ /**
+ * Method having {@link GsonJsonAnyGetter} annotation. Overwritten as new "any-getters"
+ * are identified.
+ */
+ private Method anyGetter = null;
+
+ /**
+ * Method having {@link GsonJsonAnySetter} annotation. Overwritten as new "any-setters"
+ * are identified.
+ */
+ private Method anySetter = null;
+
+
+ public Method getAnyGetter() {
+ return anyGetter;
+ }
+
+ public Method getAnySetter() {
+ return anySetter;
+ }
+
+ /**
+ * Gets the names of input properties that are not being ignored.
+ *
+ * @return the non-ignored input property names
+ */
+ public List<String> getInNotIgnored() {
+ return getNonNull(inProps);
+ }
+
+ /**
+ * Gets the names of output properties that are not being ignored.
+ *
+ * @return the non-ignored output property names
+ */
+ public List<String> getOutNotIgnored() {
+ return getNonNull(outProps);
+ }
+
+ /**
+ * Gets the property names, associated with a non-null value, from a set of
+ * properties.
+ *
+ * @param props set of properties from which to extract the names
+ * @return the property names having a non-null value
+ */
+ private List<String> getNonNull(Map<String, Object> props) {
+ List<String> lst = new ArrayList<String>(props.size());
+
+ for (Entry<String, Object> ent : props.entrySet()) {
+ if (ent.getValue() != null) {
+ lst.add(ent.getKey());
+ }
+ }
+
+ return lst;
+ }
+
+ /**
+ * Gets the input properties whose values are of the given class.
+ *
+ * @param clazz class of properties to get
+ * @return the input properties of the given class
+ */
+ public <T> List<T> getInProps(Class<T> clazz) {
+ return getProps(clazz, inProps.values());
+ }
+
+ /**
+ * Gets the output properties whose values are of the given class.
+ *
+ * @param clazz class of properties to get
+ * @return the output properties of the given class
+ */
+ public <T> List<T> getOutProps(Class<T> clazz) {
+ return getProps(clazz, outProps.values());
+ }
+
+ /**
+ * Gets the properties whose values are of the given class.
+ *
+ * @param clazz class of properties to get
+ * @param values values from which to select
+ * @return the output properties of the given class
+ */
+ @SuppressWarnings("unchecked")
+ private <T> List<T> getProps(Class<T> clazz, Collection<Object> values) {
+ List<T> lst = new ArrayList<T>(values.size());
+
+ for (Object val : values) {
+ if (val != null && val.getClass() == clazz) {
+ lst.add((T) val);
+ }
+ }
+
+ return lst;
+ }
+
+ /**
+ * Recursively walks a class hierarchy, including super classes and interfaces,
+ * examining each class for various annotations.
+ *
+ * @param clazz class whose hierarchy is to be walked
+ */
+ public void walkClassHierarchy(Class<?> clazz) {
+ if (clazz == Object.class) {
+ return;
+ }
+
+ // walk interfaces first
+ for (Class<?> intfc : clazz.getInterfaces()) {
+ walkClassHierarchy(intfc);
+ }
+
+ // walk superclass next, overwriting previous items
+ Class<?> sup = clazz.getSuperclass();
+ if (sup != null) {
+ walkClassHierarchy(sup);
+ }
+
+ // finally, examine this class, overwriting previous items
+ examine(clazz);
+ }
+
+ /**
+ * Examines a class for annotations, examining fields and then methods.
+ *
+ * @param clazz class to be examined
+ */
+ protected void examine(Class<?> clazz) {
+ for (Field field : clazz.getDeclaredFields()) {
+ examine(field);
+ }
+
+ for (Method method : clazz.getDeclaredMethods()) {
+ examine(method);
+ }
+ }
+
+ /**
+ * Examines a field for annotations.
+ *
+ * @param field field to be examined
+ */
+ protected void examine(Field field) {
+ if (field.isSynthetic()) {
+ return;
+ }
+
+ int mod = field.getModifiers();
+
+ if (Modifier.isStatic(mod)) {
+ // skip static fields
+ return;
+ }
+
+ if (!Modifier.isPublic(mod) && field.getAnnotation(GsonJsonProperty.class) == null) {
+ // private/protected - skip it unless explicitly exposed
+ return;
+ }
+
+ if (Modifier.isTransient(mod) && field.getAnnotation(GsonJsonProperty.class) == null) {
+ // transient - skip it unless explicitly exposed
+ return;
+ }
+
+ String name = Adapter.detmPropName(field);
+ if (name == null) {
+ // invalid name
+ return;
+ }
+
+ // if ignoring, then insert null into the map, otherwise insert the field
+ Field annotField = (field.getAnnotation(GsonJsonIgnore.class) != null ? null : field);
+
+ // a field can be both an input and an output
+
+ inProps.put(name, annotField);
+ outProps.put(name, annotField);
+ }
+
+ /**
+ * Examines a method for annotations.
+ *
+ * @param method method to be examined
+ */
+ protected void examine(Method method) {
+ if (method.isSynthetic()) {
+ return;
+ }
+
+ int mod = method.getModifiers();
+
+ if (Modifier.isStatic(mod)) {
+ // static methods are not exposed
+ return;
+ }
+
+ GsonJsonProperty prop = method.getAnnotation(GsonJsonProperty.class);
+ GsonJsonAnyGetter get = method.getAnnotation(GsonJsonAnyGetter.class);
+ GsonJsonAnySetter set = method.getAnnotation(GsonJsonAnySetter.class);
+
+ if (!Modifier.isPublic(mod) && prop == null && get == null && set == null) {
+ // private/protected methods are not exposed, unless annotated
+ return;
+ }
+
+
+ if (method.getReturnType() == void.class) {
+ // "void" return type - must be a "setter" method
+ if (set == null) {
+ examineSetter(method);
+
+ } else {
+ examineAnySetter(method);
+ }
+
+ } else {
+ // must be a "getter" method
+ if (get == null) {
+ examineGetter(method);
+
+ } else {
+ examineAnyGetter(method);
+ }
+ }
+ }
+
+ /**
+ * Examines a "setter" method.
+ *
+ * @param method method to be examined
+ */
+ private void examineSetter(Method method) {
+ String name = Adapter.detmSetterPropName(method);
+ if (name != null && method.getParameterCount() == 1) {
+ // remove old name mapping, if any
+ Method old = setters.get(method.getName());
+ if (old != null) {
+ inProps.remove(Adapter.detmSetterPropName(old));
+ }
+
+ setters.put(method.getName(), method);
+
+ // if ignoring, then insert null into the map, otherwise insert the method
+ inProps.put(name, (method.getAnnotation(GsonJsonIgnore.class) != null ? null : method));
+ }
+ }
+
+ /**
+ * Examines a "getter" method.
+ *
+ * @param method method to be examined
+ */
+ private void examineGetter(Method method) {
+ String name = Adapter.detmGetterPropName(method);
+ if (name != null && method.getParameterCount() == 0) {
+ // remove old name mapping, if any
+ Method old = getters.get(method.getName());
+ if (old != null) {
+ outProps.remove(Adapter.detmGetterPropName(old));
+ }
+
+ getters.put(method.getName(), method);
+
+ // if ignoring, then insert null into the map, otherwise insert the method
+ outProps.put(name, (method.getAnnotation(GsonJsonIgnore.class) != null ? null : method));
+ }
+ }
+
+ /**
+ * Examines a method having a {@link GsonJsonAnySetter} annotation.
+ *
+ * @param method method to be examined
+ */
+ private void examineAnySetter(Method method) {
+ if (method.getParameterCount() != 2) {
+ throw new JsonParseException(ANY_SETTER_MISMATCH_ERR + getFqdn(method));
+ }
+
+ if (method.getParameterTypes()[0] != String.class) {
+ throw new JsonParseException(ANY_SETTER_TYPE_ERR + getFqdn(method));
+ }
+
+ // if ignoring, then use null, otherwise use the method
+ anySetter = (method.getAnnotation(GsonJsonIgnore.class) != null ? null : method);
+ }
+
+ /**
+ * Examines a method having a {@link GsonJsonAnyGetter} annotation.
+ *
+ * @param method method to be examined
+ */
+ private void examineAnyGetter(Method method) {
+ if (method.getParameterCount() != 0) {
+ throw new JsonParseException(ANY_GETTER_MISMATCH_ERR + getFqdn(method));
+ }
+
+ // if ignoring, then use null, otherwise use the method
+ anyGetter = (method.getAnnotation(GsonJsonIgnore.class) != null ? null : method);
+ }
+
+ /**
+ * Gets the fully qualified name of a method.
+ *
+ * @param method method whose name is desired
+ * @return the fully qualified method name
+ */
+ private String getFqdn(Method method) {
+ return (method.getDeclaringClass().getName() + "." + method.getName());
+ }
+}
diff --git a/gson/src/main/java/org/onap/policy/common/gson/internal/Deserializer.java b/gson/src/main/java/org/onap/policy/common/gson/internal/Deserializer.java
new file mode 100644
index 00000000..f2975860
--- /dev/null
+++ b/gson/src/main/java/org/onap/policy/common/gson/internal/Deserializer.java
@@ -0,0 +1,39 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.gson.internal;
+
+import com.google.gson.JsonObject;
+
+/**
+ * Super class of all de-serializers.
+ */
+public interface Deserializer {
+
+ String INVOKE_ERR = "cannot invoke method to deserialize: ";
+
+ /**
+ * Gets an value from a tree, converts it, and puts it into a target object.
+ *
+ * @param source tree from which to get the value
+ * @param target where to place the converted value
+ */
+ void getFromTree(JsonObject source, Object target);
+}