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authorJim Hahn <jrh3@att.com>2019-09-13 12:14:25 -0400
committerJim Hahn <jrh3@att.com>2019-09-13 17:40:29 -0400
commitaf2e4018c92b0fb311f60dfe507335b12e2935a4 (patch)
tree62705712e2a88682e17bdd9fef248e866c7407e4 /utils/src/main
parent63922e3dc9101f019cb490f6c5d02991c10fcdf5 (diff)
Extract YamlJsonTranslator from StandardYamlCoder
Refactored StandardYamlCoder, extracting a new class, YamlJsonTranslator, from it. This facilitates performing yaml translation when not using a standard "gson" coder. Added YamlJacksonHandler which supports YAML translation layered on top of a JacksonHandler instead of a GsonMessageBodyHandler. Also added junit tests to complete coverage of StandardCoder. Also added public APPLICATION_YAML to YamlMessageBodyHandler. Change-Id: Ia470fa194661fbf1aebeaf0f18b57f2a984cb64b Issue-ID: POLICY-2081 Signed-off-by: Jim Hahn <jrh3@att.com>
Diffstat (limited to 'utils/src/main')
-rw-r--r--utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java3
-rw-r--r--utils/src/main/java/org/onap/policy/common/utils/coder/StandardYamlCoder.java217
-rw-r--r--utils/src/main/java/org/onap/policy/common/utils/coder/YamlJsonTranslator.java321
3 files changed, 330 insertions, 211 deletions
diff --git a/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java
index d3d69812..c3f2d993 100644
--- a/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java
+++ b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java
@@ -38,6 +38,8 @@ import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.nio.charset.StandardCharsets;
+import lombok.AccessLevel;
+import lombok.Getter;
import org.onap.policy.common.gson.DoubleConverter;
import org.onap.policy.common.gson.MapDoubleAdapterFactory;
@@ -49,6 +51,7 @@ public class StandardCoder implements Coder {
/**
* Gson object used to encode and decode messages.
*/
+ @Getter(AccessLevel.PROTECTED)
private static final Gson GSON =
new GsonBuilder().registerTypeAdapter(StandardCoderObject.class, new StandardTypeAdapter())
.registerTypeAdapterFactory(new MapDoubleAdapterFactory()).create();
diff --git a/utils/src/main/java/org/onap/policy/common/utils/coder/StandardYamlCoder.java b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardYamlCoder.java
index 357b106e..36f15b96 100644
--- a/utils/src/main/java/org/onap/policy/common/utils/coder/StandardYamlCoder.java
+++ b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardYamlCoder.java
@@ -20,245 +20,40 @@
package org.onap.policy.common.utils.coder;
-import com.google.gson.JsonArray;
-import com.google.gson.JsonElement;
-import com.google.gson.JsonNull;
-import com.google.gson.JsonObject;
-import com.google.gson.JsonPrimitive;
-import java.io.IOException;
import java.io.Reader;
-import java.io.StringReader;
-import java.io.StringWriter;
import java.io.Writer;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Map.Entry;
-import org.yaml.snakeyaml.DumperOptions;
-import org.yaml.snakeyaml.Yaml;
-import org.yaml.snakeyaml.emitter.Emitter;
-import org.yaml.snakeyaml.error.YAMLException;
-import org.yaml.snakeyaml.nodes.MappingNode;
-import org.yaml.snakeyaml.nodes.Node;
-import org.yaml.snakeyaml.nodes.NodeTuple;
-import org.yaml.snakeyaml.nodes.ScalarNode;
-import org.yaml.snakeyaml.nodes.SequenceNode;
-import org.yaml.snakeyaml.nodes.Tag;
-import org.yaml.snakeyaml.resolver.Resolver;
-import org.yaml.snakeyaml.serializer.Serializer;
/**
* YAML encoder and decoder using the "standard" mechanism, which is currently gson. All
* of the methods perform conversion to/from YAML (instead of JSON).
*/
public class StandardYamlCoder extends StandardCoder {
+ private final YamlJsonTranslator translator;
/**
* Constructs the object.
*/
public StandardYamlCoder() {
- super();
+ translator = new YamlJsonTranslator(getGSON());
}
@Override
protected String toJson(Object object) {
- StringWriter output = new StringWriter();
- toJson(output, object);
- return output.toString();
+ return translator.toYaml(object);
}
@Override
protected void toJson(Writer target, Object object) {
- DumperOptions dumper = new DumperOptions();
- Serializer serializer = new Serializer(new Emitter(target, dumper), new Resolver(), dumper, null);
-
- try {
- serializer.open();
- serializer.serialize(makeYaml(toJsonTree(object)));
- serializer.close();
-
- } catch (IOException e) {
- throw new YAMLException(e);
- }
+ translator.toYaml(target, object);
}
@Override
protected <T> T fromJson(String yaml, Class<T> clazz) {
- Node node = new Yaml().compose(new StringReader(yaml));
- return fromJson(makeGson(node), clazz);
+ return translator.fromYaml(yaml, clazz);
}
@Override
protected <T> T fromJson(Reader source, Class<T> clazz) {
- Node node = new Yaml().compose(source);
- return fromJson(makeGson(node), clazz);
- }
-
- /**
- * Converts an arbitrary gson element into a corresponding Yaml node.
- *
- * @param jel gson element to be converted
- * @return a yaml node corresponding to the element
- */
- private Node makeYaml(JsonElement jel) {
- if (jel.isJsonArray()) {
- return makeYamlSequence((JsonArray) jel);
-
- } else if (jel.isJsonObject()) {
- return makeYamlMap((JsonObject) jel);
-
- } else if (jel.isJsonPrimitive()) {
- return makeYamlPrim((JsonPrimitive) jel);
-
- } else {
- return new ScalarNode(Tag.NULL, "", null, null, DumperOptions.ScalarStyle.PLAIN);
- }
- }
-
- /**
- * Converts an arbitrary gson array into a corresponding Yaml sequence.
- *
- * @param jel gson element to be converted
- * @return a yaml node corresponding to the element
- */
- private Node makeYamlSequence(JsonArray jel) {
- List<Node> nodes = new ArrayList<>(jel.size());
- jel.forEach(item -> nodes.add(makeYaml(item)));
-
- return new SequenceNode(Tag.SEQ, true, nodes, null, null, DumperOptions.FlowStyle.AUTO);
- }
-
- /**
- * Converts an arbitrary gson object into a corresponding Yaml map.
- *
- * @param jel gson element to be converted
- * @return a yaml node corresponding to the element
- */
- private Node makeYamlMap(JsonObject jel) {
- List<NodeTuple> nodes = new ArrayList<>(jel.size());
-
- for (Entry<String, JsonElement> entry : jel.entrySet()) {
- Node key = new ScalarNode(Tag.STR, entry.getKey(), null, null, DumperOptions.ScalarStyle.PLAIN);
- Node value = makeYaml(entry.getValue());
-
- nodes.add(new NodeTuple(key, value));
- }
-
- return new MappingNode(Tag.MAP, true, nodes, null, null, DumperOptions.FlowStyle.AUTO);
- }
-
- /**
- * Converts an arbitrary gson primitive into a corresponding Yaml scalar.
- *
- * @param jel gson element to be converted
- * @return a yaml node corresponding to the element
- */
- private Node makeYamlPrim(JsonPrimitive jel) {
- Tag tag;
- if (jel.isNumber()) {
- Class<? extends Number> clazz = jel.getAsNumber().getClass();
-
- if (clazz == Double.class || clazz == Float.class) {
- tag = Tag.FLOAT;
-
- } else {
- tag = Tag.INT;
- }
-
- } else if (jel.isBoolean()) {
- tag = Tag.BOOL;
-
- } else {
- // treat anything else as a string
- tag = Tag.STR;
- }
-
- return new ScalarNode(tag, jel.getAsString(), null, null, DumperOptions.ScalarStyle.PLAIN);
- }
-
- /**
- * Converts an arbitrary Yaml node into a corresponding gson element.
- *
- * @param node node to be converted
- * @return a gson element corresponding to the node
- */
- private JsonElement makeGson(Node node) {
- if (node instanceof MappingNode) {
- return makeGsonObject((MappingNode) node);
-
- } else if (node instanceof SequenceNode) {
- return makeGsonArray((SequenceNode) node);
-
- } else {
- return makeGsonPrim((ScalarNode) node);
- }
-
- // yaml doesn't appear to use anchor nodes when decoding so ignore them for now
- }
-
- /**
- * Converts a Yaml sequence into a corresponding gson array.
- *
- * @param node node to be converted
- * @return a gson element corresponding to the node
- */
- private JsonElement makeGsonArray(SequenceNode node) {
- List<Node> nodes = node.getValue();
-
- JsonArray array = new JsonArray(nodes.size());
- nodes.forEach(subnode -> array.add(makeGson(subnode)));
-
- return array;
- }
-
- /**
- * Converts a Yaml map into a corresponding gson object.
- *
- * @param node node to be converted
- * @return a gson element corresponding to the node
- */
- private JsonElement makeGsonObject(MappingNode node) {
- JsonObject obj = new JsonObject();
-
- for (NodeTuple tuple : node.getValue()) {
- Node key = tuple.getKeyNode();
- String skey = ((ScalarNode) key).getValue();
-
- obj.add(skey, makeGson(tuple.getValueNode()));
- }
-
- return obj;
- }
-
- /**
- * Converts a Yaml scalar into a corresponding gson primitive.
- *
- * @param node node to be converted
- * @return a gson element corresponding to the node
- */
- private JsonElement makeGsonPrim(ScalarNode node) {
- try {
- Tag tag = node.getTag();
-
- if (tag == Tag.INT) {
- return new JsonPrimitive(Long.valueOf(node.getValue()));
-
- } else if (tag == Tag.FLOAT) {
- return new JsonPrimitive(Double.valueOf(node.getValue()));
-
- } else if (tag == Tag.BOOL) {
- return new JsonPrimitive(Boolean.valueOf(node.getValue()));
-
- } else if (tag == Tag.NULL) {
- return JsonNull.INSTANCE;
-
- } else {
- // treat anything else as a string
- return new JsonPrimitive(node.getValue());
- }
-
- } catch (NumberFormatException ex) {
- // just treat it as a string
- return new JsonPrimitive(node.getValue());
- }
+ return translator.fromYaml(source, clazz);
}
}
diff --git a/utils/src/main/java/org/onap/policy/common/utils/coder/YamlJsonTranslator.java b/utils/src/main/java/org/onap/policy/common/utils/coder/YamlJsonTranslator.java
new file mode 100644
index 00000000..906c9fdd
--- /dev/null
+++ b/utils/src/main/java/org/onap/policy/common/utils/coder/YamlJsonTranslator.java
@@ -0,0 +1,321 @@
+/*-
+ * ============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.utils.coder;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonNull;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonPrimitive;
+import java.io.IOException;
+import java.io.Reader;
+import java.io.StringReader;
+import java.io.StringWriter;
+import java.io.Writer;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map.Entry;
+import org.yaml.snakeyaml.DumperOptions;
+import org.yaml.snakeyaml.Yaml;
+import org.yaml.snakeyaml.emitter.Emitter;
+import org.yaml.snakeyaml.error.YAMLException;
+import org.yaml.snakeyaml.nodes.MappingNode;
+import org.yaml.snakeyaml.nodes.Node;
+import org.yaml.snakeyaml.nodes.NodeTuple;
+import org.yaml.snakeyaml.nodes.ScalarNode;
+import org.yaml.snakeyaml.nodes.SequenceNode;
+import org.yaml.snakeyaml.nodes.Tag;
+import org.yaml.snakeyaml.resolver.Resolver;
+import org.yaml.snakeyaml.serializer.Serializer;
+
+/**
+ * YAML-JSON translator. The methods may throw either of the runtime exceptions,
+ * YAMLException or JsonSyntaxException.
+ */
+public class YamlJsonTranslator {
+
+ /**
+ * Object to be used to translate between YAML and JsonElement.
+ */
+ private final Gson gson;
+
+ /**
+ * Constructs the object.
+ */
+ public YamlJsonTranslator() {
+ this(new Gson());
+ }
+
+ /**
+ * Constructs the object.
+ *
+ * @param gson the Gson object to be used to serialize and de-serialize
+ */
+ public YamlJsonTranslator(Gson gson) {
+ this.gson = gson;
+ }
+
+ /**
+ * Translates a POJO into a YAML String.
+ *
+ * @param object POJO to be translated
+ * @return YAML representing the original object
+ */
+ public String toYaml(Object object) {
+ StringWriter output = new StringWriter();
+ toYaml(output, object);
+ return output.toString();
+ }
+
+ /**
+ * Serializes a POJO to a writer, as YAML.
+ *
+ * @param target target writer
+ * @param object POJO to be translated
+ */
+ public void toYaml(Writer target, Object object) {
+ DumperOptions dumper = new DumperOptions();
+ Serializer serializer = new Serializer(new Emitter(target, dumper), new Resolver(), dumper, null);
+
+ try {
+ serializer.open();
+ serializer.serialize(makeYaml(toJsonTree(object)));
+ serializer.close();
+
+ } catch (IOException e) {
+ throw new YAMLException(e);
+ }
+ }
+
+ /**
+ * Translates a POJO into a JsonElement.
+ *
+ * @param object POJO to be translated
+ * @return a JsonElement representing the original object
+ */
+ protected JsonElement toJsonTree(Object object) {
+ return gson.toJsonTree(object);
+ }
+
+ /**
+ * Translates a YAML string to a POJO.
+ *
+ * @param yaml YAML string to be translated
+ * @param clazz class of POJO to be created
+ * @return a POJO representing the original YAML
+ */
+ public <T> T fromYaml(String yaml, Class<T> clazz) {
+ return fromYaml(new StringReader(yaml), clazz);
+ }
+
+ /**
+ * Translates a YAML string, read from a reader, into a POJO.
+ *
+ * @param source source of the YAML string to be translated
+ * @param clazz class of POJO to be created
+ * @return a POJO representing the YAML read from the reader
+ */
+ public <T> T fromYaml(Reader source, Class<T> clazz) {
+ Node node = new Yaml().compose(source);
+ return fromJson(makeJson(node), clazz);
+ }
+
+ /**
+ * Translates a JsonElement to a POJO of the given class.
+ *
+ * @param jel element to be translated
+ * @param clazz class of POJO to be created
+ * @return a POJO representing the original element
+ */
+ protected <T> T fromJson(JsonElement jel, Class<T> clazz) {
+ return gson.fromJson(jel, clazz);
+ }
+
+ /**
+ * Converts an arbitrary gson element into a corresponding Yaml node.
+ *
+ * @param jel gson element to be converted
+ * @return a yaml node corresponding to the element
+ */
+ protected Node makeYaml(JsonElement jel) {
+ if (jel.isJsonArray()) {
+ return makeYamlSequence((JsonArray) jel);
+
+ } else if (jel.isJsonObject()) {
+ return makeYamlMap((JsonObject) jel);
+
+ } else if (jel.isJsonPrimitive()) {
+ return makeYamlPrim((JsonPrimitive) jel);
+
+ } else {
+ return new ScalarNode(Tag.NULL, "", null, null, DumperOptions.ScalarStyle.PLAIN);
+ }
+ }
+
+ /**
+ * Converts an arbitrary gson array into a corresponding Yaml sequence.
+ *
+ * @param jel gson element to be converted
+ * @return a yaml node corresponding to the element
+ */
+ protected SequenceNode makeYamlSequence(JsonArray jel) {
+ List<Node> nodes = new ArrayList<>(jel.size());
+ jel.forEach(item -> nodes.add(makeYaml(item)));
+
+ return new SequenceNode(Tag.SEQ, true, nodes, null, null, DumperOptions.FlowStyle.AUTO);
+ }
+
+ /**
+ * Converts an arbitrary gson object into a corresponding Yaml map.
+ *
+ * @param jel gson element to be converted
+ * @return a yaml node corresponding to the element
+ */
+ protected MappingNode makeYamlMap(JsonObject jel) {
+ List<NodeTuple> nodes = new ArrayList<>(jel.size());
+
+ for (Entry<String, JsonElement> entry : jel.entrySet()) {
+ Node key = new ScalarNode(Tag.STR, entry.getKey(), null, null, DumperOptions.ScalarStyle.PLAIN);
+ Node value = makeYaml(entry.getValue());
+
+ nodes.add(new NodeTuple(key, value));
+ }
+
+ return new MappingNode(Tag.MAP, true, nodes, null, null, DumperOptions.FlowStyle.AUTO);
+ }
+
+ /**
+ * Converts an arbitrary gson primitive into a corresponding Yaml scalar.
+ *
+ * @param jel gson element to be converted
+ * @return a yaml node corresponding to the element
+ */
+ protected ScalarNode makeYamlPrim(JsonPrimitive jel) {
+ Tag tag;
+ if (jel.isNumber()) {
+ Class<? extends Number> clazz = jel.getAsNumber().getClass();
+
+ if (clazz == Double.class || clazz == Float.class) {
+ tag = Tag.FLOAT;
+
+ } else {
+ tag = Tag.INT;
+ }
+
+ } else if (jel.isBoolean()) {
+ tag = Tag.BOOL;
+
+ } else {
+ // treat anything else as a string
+ tag = Tag.STR;
+ }
+
+ return new ScalarNode(tag, jel.getAsString(), null, null, DumperOptions.ScalarStyle.PLAIN);
+ }
+
+ /**
+ * Converts an arbitrary Yaml node into a corresponding gson element.
+ *
+ * @param node node to be converted
+ * @return a gson element corresponding to the node
+ */
+ protected JsonElement makeJson(Node node) {
+ if (node instanceof MappingNode) {
+ return makeJsonObject((MappingNode) node);
+
+ } else if (node instanceof SequenceNode) {
+ return makeJsonArray((SequenceNode) node);
+
+ } else {
+ return makeJsonPrim((ScalarNode) node);
+ }
+
+ // yaml doesn't appear to use anchor nodes when decoding so ignore them for now
+ }
+
+ /**
+ * Converts a Yaml sequence into a corresponding gson array.
+ *
+ * @param node node to be converted
+ * @return a gson element corresponding to the node
+ */
+ protected JsonArray makeJsonArray(SequenceNode node) {
+ List<Node> nodes = node.getValue();
+
+ JsonArray array = new JsonArray(nodes.size());
+ nodes.forEach(subnode -> array.add(makeJson(subnode)));
+
+ return array;
+ }
+
+ /**
+ * Converts a Yaml map into a corresponding gson object.
+ *
+ * @param node node to be converted
+ * @return a gson element corresponding to the node
+ */
+ protected JsonObject makeJsonObject(MappingNode node) {
+ JsonObject obj = new JsonObject();
+
+ for (NodeTuple tuple : node.getValue()) {
+ Node key = tuple.getKeyNode();
+ String skey = ((ScalarNode) key).getValue();
+
+ obj.add(skey, makeJson(tuple.getValueNode()));
+ }
+
+ return obj;
+ }
+
+ /**
+ * Converts a Yaml scalar into a corresponding gson primitive.
+ *
+ * @param node node to be converted
+ * @return a gson element corresponding to the node
+ */
+ protected JsonElement makeJsonPrim(ScalarNode node) {
+ try {
+ Tag tag = node.getTag();
+
+ if (tag == Tag.INT) {
+ return new JsonPrimitive(Long.valueOf(node.getValue()));
+
+ } else if (tag == Tag.FLOAT) {
+ return new JsonPrimitive(Double.valueOf(node.getValue()));
+
+ } else if (tag == Tag.BOOL) {
+ return new JsonPrimitive(Boolean.valueOf(node.getValue()));
+
+ } else if (tag == Tag.NULL) {
+ return JsonNull.INSTANCE;
+
+ } else {
+ // treat anything else as a string
+ return new JsonPrimitive(node.getValue());
+ }
+
+ } catch (NumberFormatException ex) {
+ // just treat it as a string
+ return new JsonPrimitive(node.getValue());
+ }
+ }
+}