All Downloads are FREE. Search and download functionalities are using the official Maven repository.

org.jbpm.jpdl.el.impl.BeanInfoManager Maven / Gradle / Ivy

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written 
 *    permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 */
package org.jbpm.jpdl.el.impl;

import java.beans.BeanInfo;
import java.beans.EventSetDescriptor;
import java.beans.IndexedPropertyDescriptor;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;

import org.jbpm.jpdl.el.ELException;

/**
 * 
 * 

* Manages the BeanInfo for one class - contains the BeanInfo, and also a * mapping from property name to BeanInfoProperty. There are also static methods * for accessing the BeanInfoManager for a class - those mappings are cached * permanently so that once the BeanInfoManager is calculated, it doesn't have * to be calculated again. * * @author Nathan Abramson - Art Technology Group * @author Tom Baeyens - JBoss * @version $Change: 181181 $$DateTime: 2001/06/26 09:55:09 $$Author$ */ public class BeanInfoManager { // ------------------------------------- // Properties // ------------------------------------- // property beanClass Class mBeanClass; public Class getBeanClass() { return mBeanClass; } // ------------------------------------- // Member variables // ------------------------------------- // The BeanInfo BeanInfo mBeanInfo; // Mapping from property name to BeanInfoProperty Map mPropertyByName; // Mapping from property name to BeanInfoIndexedProperty Map mIndexedPropertyByName; // Mapping from method name to BeanMethod Map mMethodByName; // Mapping from event set name to event set descriptor Map mEventSetByName; // Flag if this is initialized boolean mInitialized; // The global mapping from class to BeanInfoManager static Map mBeanInfoManagerByClass = new HashMap(); // ------------------------------------- /** * * Constructor */ BeanInfoManager(Class pBeanClass) { mBeanClass = pBeanClass; } // ------------------------------------- /** * * Returns the BeanInfoManager for the specified class */ public static BeanInfoManager getBeanInfoManager(Class pClass) { BeanInfoManager ret = (BeanInfoManager) mBeanInfoManagerByClass.get(pClass); if (ret == null) { ret = createBeanInfoManager(pClass); } return ret; } // ------------------------------------- /** * * Creates and registers the BeanInfoManager for the given class if it isn't * already registered. */ static synchronized BeanInfoManager createBeanInfoManager(Class pClass) { // Because this method is synchronized statically, the // BeanInfoManager is not initialized at this time (otherwise it // could end up being a bottleneck for the entire system). It is // put into the map in an uninitialized state. The first time // someone tries to use it, it will be initialized (with proper // synchronizations in place to make sure it is only initialized // once). BeanInfoManager ret = (BeanInfoManager) mBeanInfoManagerByClass.get(pClass); if (ret == null) { ret = new BeanInfoManager(pClass); mBeanInfoManagerByClass.put(pClass, ret); } return ret; } // ------------------------------------- /** * * Returns the BeanInfoProperty for the specified property in the given class, * or null if not found. */ public static BeanInfoProperty getBeanInfoProperty(Class pClass, String pPropertyName, Logger pLogger) throws ELException { return getBeanInfoManager(pClass).getProperty(pPropertyName, pLogger); } // ------------------------------------- /** * * Returns the BeanInfoIndexedProperty for the specified property in the given * class, or null if not found. */ public static BeanInfoIndexedProperty getBeanInfoIndexedProperty(Class pClass, String pIndexedPropertyName, Logger pLogger) throws ELException { return getBeanInfoManager(pClass).getIndexedProperty(pIndexedPropertyName, pLogger); } public static BeanMethod getBeanMethod(Class pClass, String indexStr, Logger logger) throws ELException { return getBeanInfoManager(pClass).getBeanMethod(indexStr,logger); } // ------------------------------------- /** * * Makes sure that this class has been initialized, and synchronizes the * initialization if it's required. */ void checkInitialized(Logger pLogger) throws ELException { if (!mInitialized) { synchronized (this) { if (!mInitialized) { initialize(pLogger); mInitialized = true; } } } } // ------------------------------------- /** * * Initializes by mapping property names to BeanInfoProperties */ void initialize(Logger pLogger) throws ELException { try { mBeanInfo = Introspector.getBeanInfo(mBeanClass); mPropertyByName = new HashMap(); mIndexedPropertyByName = new HashMap(); mMethodByName = new HashMap(); PropertyDescriptor[] pds = mBeanInfo.getPropertyDescriptors(); for (int i = 0; pds != null && i < pds.length; i++) { // Treat as both an indexed property and a normal property PropertyDescriptor pd = pds[i]; if (pd instanceof IndexedPropertyDescriptor) { IndexedPropertyDescriptor ipd = (IndexedPropertyDescriptor) pd; Method readMethod = getPublicMethod(ipd.getIndexedReadMethod()); Method writeMethod = getPublicMethod(ipd.getIndexedWriteMethod()); BeanInfoIndexedProperty property = new BeanInfoIndexedProperty(readMethod, writeMethod, ipd); mIndexedPropertyByName.put(ipd.getName(), property); } Method readMethod = getPublicMethod(pd.getReadMethod()); Method writeMethod = getPublicMethod(pd.getWriteMethod()); BeanInfoProperty property = new BeanInfoProperty(readMethod, writeMethod, pd); mPropertyByName.put(pd.getName(), property); } mEventSetByName = new HashMap(); EventSetDescriptor[] esds = mBeanInfo.getEventSetDescriptors(); for (int i = 0; esds != null && i < esds.length; i++) { EventSetDescriptor esd = esds[i]; mEventSetByName.put(esd.getName(), esd); } } catch (IntrospectionException exc) { if (pLogger.isLoggingWarning()) { pLogger.logWarning(Constants.EXCEPTION_GETTING_BEANINFO, exc, mBeanClass.getName()); } } // parsing the bean methods Class scannedClass = mBeanClass; while (scannedClass!=null) { Method[] methods = scannedClass.getDeclaredMethods(); for (int i=0; i





© 2015 - 2025 Weber Informatics LLC | Privacy Policy