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Commons Digester example source code file (LoaderFromClass.java)
The Commons Digester LoaderFromClass.java source code/* $Id: LoaderFromClass.java 992060 2010-09-02 19:09:47Z simonetripodi $ * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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. */ package org.apache.commons.digester.plugins.strategies; import java.lang.reflect.Method; import org.apache.commons.digester.Digester; import org.apache.commons.beanutils.MethodUtils; import org.apache.commons.logging.Log; import org.apache.commons.digester.plugins.RuleLoader; import org.apache.commons.digester.plugins.PluginException; /** * A RuleLoader which invokes a static method on a target class, leaving that * method to actually instantiate and add new rules to a Digester instance. * * @since 1.6 */ public class LoaderFromClass extends RuleLoader { private Class<?> rulesClass; private Method rulesMethod; /** Constructor. */ public LoaderFromClass(Class<?> rulesClass, Method rulesMethod) { this.rulesClass = rulesClass; this.rulesMethod = rulesMethod; } /** Constructor. */ public LoaderFromClass(Class<?> rulesClass, String methodName) throws PluginException { Method method = locateMethod(rulesClass, methodName); if (method == null) { throw new PluginException( "rule class " + rulesClass.getName() + " does not have method " + methodName + " or that method has an invalid signature."); } this.rulesClass = rulesClass; this.rulesMethod = method; } /** * Just invoke the target method. */ @Override public void addRules(Digester d, String path) throws PluginException { Log log = d.getLogger(); boolean debug = log.isDebugEnabled(); if (debug) { log.debug( "LoaderFromClass loading rules for plugin at path [" + path + "]"); } try { Object[] params = {d, path}; rulesMethod.invoke(null, params); } catch (Exception e) { throw new PluginException( "Unable to invoke rules method " + rulesMethod + " on rules class " + rulesClass, e); } } /** * Find a method on the specified class whose name matches methodName, * and whose signature is: * <code> public static void foo(Digester d, String patternPrefix);. * * @return null if no such method exists. */ public static Method locateMethod(Class<?> rulesClass, String methodName) throws PluginException { Class<?>[] paramSpec = { Digester.class, String.class }; Method rulesMethod = MethodUtils.getAccessibleMethod( rulesClass, methodName, paramSpec); return rulesMethod; } } Other Commons Digester examples (source code examples)Here is a short list of links related to this Commons Digester LoaderFromClass.java source code file: |
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