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authorJim Hahn <jrh3@att.com>2020-01-30 00:11:26 -0500
committerJim Hahn <jrh3@att.com>2020-01-30 01:28:59 -0500
commitce4ba883cc815e107dd8671ccaa03b64ae08b840 (patch)
treea856e71503171d2be17f94f9afd246a8a689b2f2 /common-parameters/src/main/java
parent2ce955e7c3c53b16596a18b0f5f68f2b491d1de6 (diff)
Add a bean validator
Added a bean validator that will validate the fields within an arbitrary object using the annotations in the parameters package. Also added validateMap to the bean validators. Issue-ID: POLICY-1625 Signed-off-by: Jim Hahn <jrh3@att.com> Change-Id: I2192f3d1ba735d3779c35711a7dba053918aa547
Diffstat (limited to 'common-parameters/src/main/java')
-rw-r--r--common-parameters/src/main/java/org/onap/policy/common/parameters/BeanValidationResult.java35
-rw-r--r--common-parameters/src/main/java/org/onap/policy/common/parameters/BeanValidator.java353
2 files changed, 386 insertions, 2 deletions
diff --git a/common-parameters/src/main/java/org/onap/policy/common/parameters/BeanValidationResult.java b/common-parameters/src/main/java/org/onap/policy/common/parameters/BeanValidationResult.java
index f8eebcf1..752e4d40 100644
--- a/common-parameters/src/main/java/org/onap/policy/common/parameters/BeanValidationResult.java
+++ b/common-parameters/src/main/java/org/onap/policy/common/parameters/BeanValidationResult.java
@@ -1,6 +1,6 @@
-/*
+/*-
* ============LICENSE_START=======================================================
- * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2019-2020 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.
@@ -23,6 +23,9 @@ package org.onap.policy.common.parameters;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.function.BiConsumer;
import java.util.function.Function;
/**
@@ -129,6 +132,34 @@ public class BeanValidationResult extends ValidationResultImpl {
}
/**
+ * Validates the entries in a map.
+ *
+ * @param mapName name of the list
+ * @param map map whose entries are to be validated, or {@code null}
+ * @param entryValidator function to validate an entry in the map
+ * @return {@code true} if all entries in the map are valid, {@code false} otherwise
+ */
+ public <V> boolean validateMap(String mapName, Map<String, V> map,
+ BiConsumer<BeanValidationResult, Entry<String, V>> entryValidator) {
+ if (map == null) {
+ return true;
+ }
+
+ BeanValidationResult result = new BeanValidationResult(mapName, null);
+ for (Entry<String, V> ent : map.entrySet()) {
+ entryValidator.accept(result, ent);
+ }
+
+ if (result.isValid()) {
+ return true;
+
+ } else {
+ addResult(result);
+ return false;
+ }
+ }
+
+ /**
* Gets the validation result.
*
* @param initialIndentation the indentation to use on the main result output
diff --git a/common-parameters/src/main/java/org/onap/policy/common/parameters/BeanValidator.java b/common-parameters/src/main/java/org/onap/policy/common/parameters/BeanValidator.java
new file mode 100644
index 00000000..dbd3c7ce
--- /dev/null
+++ b/common-parameters/src/main/java/org/onap/policy/common/parameters/BeanValidator.java
@@ -0,0 +1,353 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2020 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.parameters;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.BiPredicate;
+import java.util.function.Predicate;
+import org.apache.commons.lang3.StringUtils;
+import org.onap.policy.common.parameters.annotations.Max;
+import org.onap.policy.common.parameters.annotations.Min;
+import org.onap.policy.common.parameters.annotations.NotBlank;
+import org.onap.policy.common.parameters.annotations.NotNull;
+
+/**
+ * Bean validator, supporting the parameter annotations.
+ * <p/>
+ * Note: this currently does not support Min/Max validation of "short" or "byte"; these
+ * annotations are simply ignored for these types.
+ */
+public class BeanValidator {
+
+ /**
+ * {@code True} if there is a field-level annotation, {@code false} otherwise.
+ */
+ private boolean fieldIsAnnotated;
+
+ /**
+ * Validates top level fields within an object. For each annotated field, it retrieves
+ * the value using the public "getter" method for the field. If there is no public
+ * "getter" method, then it throws an exception. Otherwise, it validates the retrieved
+ * value based on the annotations. This recurses through super classes looking for
+ * fields to be verified, but it does not examine any interfaces.
+ *
+ * @param name name of the object being validated
+ * @param object object to be validated. If {@code null}, then an empty result is
+ * returned
+ * @return the validation result
+ */
+ public BeanValidationResult validateTop(String name, Object object) {
+ BeanValidationResult result = new BeanValidationResult(name, object);
+ if (object == null) {
+ return result;
+ }
+
+ // check class hierarchy - don't need to check interfaces
+ for (Class<?> clazz = object.getClass(); clazz != null; clazz = clazz.getSuperclass()) {
+ validateFields(result, object, clazz);
+ }
+
+ return result;
+ }
+
+ /**
+ * Performs validation of all annotated fields found within the class.
+ *
+ * @param result validation results are added here
+ * @param object object whose fields are to be validated
+ * @param clazz class, within the object's hierarchy, to be examined for fields to be
+ * verified
+ */
+ private void validateFields(BeanValidationResult result, Object object, Class<?> clazz) {
+ for (Field field : clazz.getDeclaredFields()) {
+ validateField(result, object, clazz, field);
+ }
+ }
+
+ /**
+ * Performs validation of a single field.
+ *
+ * @param result validation results are added here
+ * @param object object whose fields are to be validated
+ * @param clazz class, within the object's hierarchy, containing the field
+ * @param field field whose value is to be validated
+ */
+ private void validateField(BeanValidationResult result, Object object, Class<?> clazz, Field field) {
+ final String fieldName = field.getName();
+ if (fieldName.contains("$")) {
+ return;
+ }
+
+ /*
+ * Identify the annotations. NotNull MUST be first so the check is run before the
+ * others.
+ */
+ fieldIsAnnotated = false;
+ List<Predicate<Object>> checkers = new ArrayList<>(10);
+ addAnnotation(clazz, field, checkers, NotNull.class, (annot, value) -> verNotNull(result, fieldName, value));
+ addAnnotation(clazz, field, checkers, NotBlank.class, (annot, value) -> verNotBlank(result, fieldName, value));
+ addAnnotation(clazz, field, checkers, Max.class, (annot, value) -> verMax(result, fieldName, annot, value));
+ addAnnotation(clazz, field, checkers, Min.class, (annot, value) -> verMin(result, fieldName, annot, value));
+
+ if (checkers.isEmpty()) {
+ // has no annotations - nothing to check
+ return;
+ }
+
+ // verify the field type is of interest
+ int mod = field.getModifiers();
+ if (Modifier.isStatic(mod)) {
+ classOnly(clazz.getName() + "." + fieldName + " is annotated but the field is static");
+ return;
+ }
+
+ // get the field's "getter" method
+ Method accessor = getAccessor(object.getClass(), fieldName);
+ if (accessor == null) {
+ classOnly(clazz.getName() + "." + fieldName + " is annotated but has no \"get\" method");
+ return;
+ }
+
+ // get the value
+ Object value = getValue(object, clazz, fieldName, accessor);
+
+ // perform the checks
+ if (value == null && field.getAnnotation(NotNull.class) == null && clazz.getAnnotation(NotNull.class) == null) {
+ // value is null and there's no null check - just return
+ return;
+ }
+
+ for (Predicate<Object> checker : checkers) {
+ if (!checker.test(value)) {
+ // invalid - don't bother with additional checks
+ return;
+ }
+ }
+ }
+
+ /**
+ * Gets the value from the object using the accessor function.
+ *
+ * @param object object whose value is to be retrieved
+ * @param clazz class containing the field
+ * @param fieldName name of the field
+ * @param accessor "getter" method
+ * @return the object's value
+ */
+ private Object getValue(Object object, Class<?> clazz, final String fieldName, Method accessor) {
+ try {
+ return accessor.invoke(object);
+
+ } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
+ throw new IllegalArgumentException(clazz.getName() + "." + fieldName + " accessor threw an exception", e);
+ }
+ }
+
+ /**
+ * Throws an exception if there are field-level annotations.
+ *
+ * @param exceptionMessage exception message
+ */
+ private void classOnly(String exceptionMessage) {
+ if (fieldIsAnnotated) {
+ throw new IllegalArgumentException(exceptionMessage);
+ }
+ }
+
+ /**
+ * Looks for an annotation at the class or field level. If an annotation is found at
+ * either the field or class level, then it adds a verifier to the list of checkers.
+ *
+ * @param clazz class to be searched
+ * @param field field to be searched
+ * @param checkers where to place the new field verifier
+ * @param annotClass class of annotation to find
+ * @param check verification function to be added to the list, if the annotation is
+ * found
+ */
+ private <T extends Annotation> void addAnnotation(Class<?> clazz, Field field, List<Predicate<Object>> checkers,
+ Class<T> annotClass, BiPredicate<T, Object> check) {
+
+ // field annotation takes precedence over class annotation
+ T annot = field.getAnnotation(annotClass);
+ if (annot != null) {
+ fieldIsAnnotated = true;
+
+ } else if ((annot = clazz.getAnnotation(annotClass)) == null) {
+ return;
+ }
+
+ T annot2 = annot;
+ checkers.add(value -> check.test(annot2, value));
+ }
+
+ /**
+ * Verifies that the value is not null.
+ *
+ * @param result where to add the validation result
+ * @param fieldName field whose value is being verified
+ * @param value value to be verified, assumed to be non-null
+ * @return {@code true} if the value is valid, {@code false} otherwise
+ */
+ private boolean verNotNull(BeanValidationResult result, String fieldName, Object value) {
+ return result.validateNotNull(fieldName, value);
+ }
+
+ /**
+ * Verifies that the value is not blank.
+ *
+ * @param result where to add the validation result
+ * @param fieldName field whose value is being verified
+ * @param value value to be verified, assumed to be non-null
+ * @return {@code true} if the value is valid, {@code false} otherwise
+ */
+ private boolean verNotBlank(BeanValidationResult result, String fieldName, Object value) {
+ if (value instanceof String && StringUtils.isBlank(value.toString())) {
+ ObjectValidationResult fieldResult =
+ new ObjectValidationResult(fieldName, value, ValidationStatus.INVALID, "is blank");
+ result.addResult(fieldResult);
+ return false;
+ }
+
+ return true;
+ }
+
+ /**
+ * Verifies that the value is <= the minimum value.
+ *
+ * @param result where to add the validation result
+ * @param fieldName field whose value is being verified
+ * @param annot annotation against which the value is being verified
+ * @param value value to be verified, assumed to be non-null
+ * @return {@code true} if the value is valid, {@code false} otherwise
+ */
+ private boolean verMax(BeanValidationResult result, String fieldName, Max annot, Object value) {
+ if (!(value instanceof Number)) {
+ return true;
+ }
+
+ Number num = (Number) value;
+ if (num instanceof Integer || num instanceof Long) {
+ if (num.longValue() <= annot.value()) {
+ return true;
+ }
+
+ } else if (num instanceof Float || num instanceof Double) {
+ if (num.doubleValue() <= annot.value()) {
+ return true;
+ }
+
+ } else {
+ return true;
+ }
+
+ ObjectValidationResult fieldResult = new ObjectValidationResult(fieldName, value, ValidationStatus.INVALID,
+ "exceeds the maximum value: " + annot.value());
+ result.addResult(fieldResult);
+ return false;
+ }
+
+ /**
+ * Verifies that the value is >= the minimum value.
+ *
+ * @param result where to add the validation result
+ * @param fieldName field whose value is being verified
+ * @param annot annotation against which the value is being verified
+ * @param value value to be verified, assumed to be non-null
+ * @return {@code true} if the value is valid, {@code false} otherwise
+ */
+ private boolean verMin(BeanValidationResult result, String fieldName, Min annot, Object value) {
+ if (!(value instanceof Number)) {
+ return true;
+ }
+
+ Number num = (Number) value;
+ if (num instanceof Integer || num instanceof Long) {
+ if (num.longValue() >= annot.value()) {
+ return true;
+ }
+
+ } else if (num instanceof Float || num instanceof Double) {
+ if (num.doubleValue() >= annot.value()) {
+ return true;
+ }
+
+ } else {
+ return true;
+ }
+
+ ObjectValidationResult fieldResult = new ObjectValidationResult(fieldName, value, ValidationStatus.INVALID,
+ "is below the minimum value: " + annot.value());
+ result.addResult(fieldResult);
+ return false;
+ }
+
+ /**
+ * Gets an accessor method for the given field.
+ *
+ * @param clazz class whose methods are to be searched
+ * @param fieldName field whose "getter" is to be identified
+ * @return the field's "getter" method, or {@code null} if it is not found
+ */
+ private Method getAccessor(Class<?> clazz, String fieldName) {
+ String capname = StringUtils.capitalize(fieldName);
+ Method accessor = getMethod(clazz, "get" + capname);
+ if (accessor != null) {
+ return accessor;
+ }
+
+ return getMethod(clazz, "is" + capname);
+ }
+
+ /**
+ * Gets the "getter" method having the specified name.
+ *
+ * @param clazz class whose methods are to be searched
+ * @param methodName name of the method of interest
+ * @return the method, or {@code null} if it is not found
+ */
+ private Method getMethod(Class<?> clazz, String methodName) {
+ for (Method method : clazz.getMethods()) {
+ if (methodName.equals(method.getName()) && validMethod(method)) {
+ return method;
+ }
+ }
+
+ return null;
+ }
+
+ /**
+ * Determines if a method is a valid "getter".
+ *
+ * @param method method to be checked
+ * @return {@code true} if the method is a valid "getter", {@code false} otherwise
+ */
+ private boolean validMethod(Method method) {
+ int mod = method.getModifiers();
+ return !(Modifier.isStatic(mod) || method.getReturnType() == void.class || method.getParameterCount() != 0);
+ }
+}