Mercurial > hg > blitz_condensed
view src/com/go/trove/util/CompleteIntrospector.java @ 28:4b2f23b6feca
Add a schema compatibility check to indexer that parallels storage.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:11:15 +0100 |
parents | 3dc0c5604566 |
children |
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/* ==================================================================== * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group * ==================================================================== * The Tea Software License, Version 1.1 * * Copyright (c) 2000 Walt Disney Internet Group. 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 acknowledgment: * "This product includes software developed by the * Walt Disney Internet Group (http://opensource.go.com/)." * Alternately, this acknowledgment may appear in the software itself, * if and wherever such third-party acknowledgments normally appear. * * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must * not be used to endorse or promote products derived from this * software without prior written permission. For written * permission, please contact opensource@dig.com. * * 5. Products derived from this software may not be called "Tea", * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior * written permission of the Walt Disney Internet 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 WALT DISNEY INTERNET GROUP 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. * ==================================================================== * * For more information about Tea, please see http://opensource.go.com/. */ package com.go.trove.util; import java.beans.*; import java.util.*; import java.lang.ref.*; /****************************************************************************** * A JavaBean Introspector that ensures interface properties are properly * discovered. * * @author Brian S O'Neill * @version * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/12/13 <!-- $--> */ public class CompleteIntrospector { // Weakly maps Class objects to softly referenced PropertyDescriptor maps. private static Map cPropertiesCache; static { cPropertiesCache = new IdentityMap(); // The Introspector has a poor design in that a special GLOBAL setting // is used. The default setting has a negative affect because the // BeanInfo search path disregards packages. By default, the search // path provides a BeanInfo for Component, which is for // java.awt.Component. However, any class with this name, in any // package, will be given the visible properties of java.awt.Component. Introspector.setBeanInfoSearchPath(new String[0]); } /** * Test program. */ public static void main(String[] args) throws Exception { Map map = getAllProperties(Class.forName(args[0])); Iterator keys = map.keySet().iterator(); while (keys.hasNext()) { String key = (String)keys.next(); PropertyDescriptor desc = (PropertyDescriptor)map.get(key); System.out.println(key + " = " + desc); } } /** * A function that returns a Map of all the available properties on * a given class including write-only properties. The properties returned * is mostly a superset of those returned from the standard JavaBeans * Introspector except more properties are made available to interfaces. * * @return an unmodifiable mapping of property names (Strings) to * PropertyDescriptor objects. * */ public static Map getAllProperties(Class clazz) throws IntrospectionException { synchronized (cPropertiesCache) { Map properties; Reference ref = (Reference)cPropertiesCache.get(clazz); if (ref != null) { properties = (Map)ref.get(); if (properties != null) { return properties; } else { // Clean up cleared reference. cPropertiesCache.remove(clazz); } } properties = Collections.unmodifiableMap(createProperties(clazz)); cPropertiesCache.put(clazz, new SoftReference(properties)); return properties; } } private static Map createProperties(Class clazz) throws IntrospectionException { Map properties = new HashMap(); if (clazz == null || clazz.isPrimitive()) { return properties; } BeanInfo info; try { info = Introspector.getBeanInfo(clazz); } catch (LinkageError e) { throw new IntrospectionException(e.toString()); } if (info != null) { PropertyDescriptor[] pdArray = info.getPropertyDescriptors(); // Standard properties. int length = pdArray.length; for (int i=0; i<length; i++) { properties.put(pdArray[i].getName(), pdArray[i]); } } // Properties defined in Object are also available to interfaces. if (clazz.isInterface()) { properties.putAll(getAllProperties(Object.class)); } // Ensure that all implemented interfaces are properly analyzed. Class[] interfaces = clazz.getInterfaces(); for (int i=0; i<interfaces.length; i++) { properties.putAll(getAllProperties(interfaces[i])); } // Filter out properties with names that contain '$' characters. Iterator it = properties.keySet().iterator(); while (it.hasNext()) { String propertyName = (String)it.next(); if (propertyName.indexOf('$') >= 0) { it.remove(); } } return properties; } }