/*
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* The contents of this file are subject to the terms of the Common Development and
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* Distribution License (the License). You may not use this file except in compliance with the
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* License.
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*
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* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
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* specific language governing permission and limitations under the License.
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*
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* When distributing Covered Software, include this CDDL Header Notice in each file and include
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* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
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* Header, with the fields enclosed by brackets [] replaced by your own identifying
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* information: "Portions Copyright [year] [name of copyright owner]".
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*
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* Copyright 2013-2016 ForgeRock AS.
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*/
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package org.forgerock.opendj.config;
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import static org.mockito.Mockito.mock;
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import java.lang.reflect.Method;
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import java.lang.reflect.ParameterizedType;
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import java.util.Collection;
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import java.util.SortedSet;
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import java.util.TreeSet;
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import org.mockito.internal.stubbing.defaultanswers.ReturnsEmptyValues;
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import org.mockito.invocation.InvocationOnMock;
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/**
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* Provides Mockito mocks for Configuration objects with default values
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* corresponding to those defined in xml configuration files.
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* <p>
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* These mocks can be used like any other mocks, e.g, you can define stubs using
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* {@code when} method or verify calls using {@code verify} method.
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* <p>
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* Example:
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*
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* <pre>
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* LDAPConnectionHandlerCfg mockCfg = mockCfg(LDAPConnectionHandlerCfg.class);
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* assertThat(mockCfg.getMaxRequestSize()).isEqualTo(5 * 1000 * 1000);
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* </pre>
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*/
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public final class ConfigurationMock {
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private static final ConfigAnswer CONFIG_ANSWER = new ConfigAnswer();
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/**
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* Returns a mock for the provided configuration class.
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* <p>
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* If a setting has a default value, the mock automatically returns the
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* default value when the getter is called on the setting.
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* <p>
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* It is possible to override this default behavior with the usual methods
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* calls with Mockito (e.g, {@code when} method).
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*
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* @param <T>
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* The type of configuration.
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* @param configClass
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* The configuration class.
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* @return a mock
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*/
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public static <T extends Configuration> T mockCfg(Class<T> configClass) {
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return mock(configClass, CONFIG_ANSWER);
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}
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/**
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* A stubbed answer for Configuration objects, allowing to return default
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* value for settings when available.
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*/
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private static class ConfigAnswer extends ReturnsEmptyValues {
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private static final long serialVersionUID = 1L;
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@Override
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public Object answer(InvocationOnMock invocation) {
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try {
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String definitionClassName =
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toDefinitionClassName(invocation.getMethod().getDeclaringClass().getName());
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Class<?> definitionClass = Class.forName(definitionClassName);
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ManagedObjectDefinition<?, ?> definition =
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(ManagedObjectDefinition<?, ?>) definitionClass.getMethod("getInstance").invoke(null);
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String invokedMethodName = invocation.getMethod().getName();
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if (!isGetterMethod(invokedMethodName)) {
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return answerFromDefaultMockitoBehavior(invocation);
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}
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Method getPropertyDefMethod = getPropertyDefinitionMethod(definitionClass, invokedMethodName);
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Class<?> propertyReturnType = getPropertyReturnType(getPropertyDefMethod);
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Object defaultValue = getDefaultValue(definition, getPropertyDefMethod, propertyReturnType);
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if (defaultValue != null) {
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return defaultValue;
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}
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return answerFromDefaultMockitoBehavior(invocation);
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} catch (Exception e) {
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return answerFromDefaultMockitoBehavior(invocation);
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}
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}
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private Object answerFromDefaultMockitoBehavior(InvocationOnMock invocation) {
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return super.answer(invocation);
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}
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private boolean isGetterMethod(String invokedMethodName) {
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return invokedMethodName.startsWith("get") || invokedMethodName.startsWith("is");
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}
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private Method getPropertyDefinitionMethod(Class<?> definitionClass, String invokedMethodName)
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throws SecurityException, NoSuchMethodException {
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// Methods for boolean starts with "is" in Cfg class but with "get" in CfgDefn class.
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return definitionClass.getMethod(invokedMethodName.replaceAll("^is", "get") + "PropertyDefinition");
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}
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/** Returns the type of values returned by the property. */
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private Class<?> getPropertyReturnType(Method getPropertyDefMethod) {
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Class<?> returnClass = getPropertyDefMethod.getReturnType();
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return ((ParameterizedType) returnClass.getGenericSuperclass())
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.getActualTypeArguments()[0].getClass();
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}
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/**
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* Retrieve class name of definition from class name of configuration.
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* <p>
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* Convert class name "[package].server.FooCfg" to "[package].meta.FooCfgDef"
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*/
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private String toDefinitionClassName(String configClassName) {
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int finalDot = configClassName.lastIndexOf('.');
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return configClassName.substring(0, finalDot - 6) + "meta."
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+ configClassName.substring(finalDot + 1) + "Defn";
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}
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/**
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* Returns the default value corresponding to the provided property
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* definition getter method from the provided managed object definition.
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*
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* @param <T>
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* The data type of values provided by the property
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* definition.
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* @param definition
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* The definition of the managed object.
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* @param getPropertyDefMethod
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* The method to retrieve the property definition from the
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* definition.
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* @param propertyReturnClass
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* The class of values provided by the property definition.
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* @return the default value of property definition, or
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* {@code null} if there is no default value.
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* @throws Exception
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* If an error occurs.
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*/
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@SuppressWarnings("unchecked")
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private <T> Object getDefaultValue(ManagedObjectDefinition<?, ?> definition,
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Method getPropertyDefMethod, Class<T> propertyReturnClass)
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throws Exception {
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PropertyDefinition<T> propertyDefinition = (PropertyDefinition<T>) getPropertyDefMethod.invoke(definition);
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DefaultBehaviorProvider<T> defaultBehaviorProvider = (DefaultBehaviorProvider<T>) propertyDefinition
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.getClass().getMethod("getDefaultBehaviorProvider").invoke(propertyDefinition);
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MockProviderVisitor<T> visitor = new MockProviderVisitor<>(propertyDefinition);
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Collection<T> values = defaultBehaviorProvider.accept(visitor, null);
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if (values == null) {
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// No default behavior defined
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return null;
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} else if (propertyDefinition.hasOption(PropertyOption.MULTI_VALUED)) {
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return values;
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} else {
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// Single value returned
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return values.iterator().next();
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}
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}
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}
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/** Visitor used to retrieve the default value. */
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private static class MockProviderVisitor<T> implements DefaultBehaviorProviderVisitor<T, Collection<T>, Void> {
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/** The property definition used to decode the values. */
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private PropertyDefinition<T> propertyDef;
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MockProviderVisitor(PropertyDefinition<T> propertyDef) {
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this.propertyDef = propertyDef;
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}
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@Override
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public Collection<T> visitAbsoluteInherited(AbsoluteInheritedDefaultBehaviorProvider<T> provider, Void p) {
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// not handled
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return null;
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}
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@Override
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public Collection<T> visitAlias(AliasDefaultBehaviorProvider<T> provider, Void p) {
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// not handled
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return null;
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}
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/** Returns the default value for the property as a collection. */
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@Override
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public Collection<T> visitDefined(DefinedDefaultBehaviorProvider<T> provider, Void p) {
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SortedSet<T> values = new TreeSet<>();
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for (String stringValue : provider.getDefaultValues()) {
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values.add(propertyDef.decodeValue(stringValue));
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}
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return values;
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}
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@Override
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public Collection<T> visitRelativeInherited(RelativeInheritedDefaultBehaviorProvider<T> d, Void p) {
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// not handled
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return null;
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}
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@Override
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public Collection<T> visitUndefined(UndefinedDefaultBehaviorProvider<T> d, Void p) {
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// not handled
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return null;
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}
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}
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}
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