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The source code/* * Copyright (C) The Apache Software Foundation. All rights reserved. * * This software is published under the terms of the Apache Software * License version 1.1, a copy of which has been included with this * distribution in the LICENSE.txt file. */ package org.apache.log4j.config; import java.beans.*; import java.lang.reflect.*; import org.apache.log4j.Priority; import org.apache.log4j.helpers.LogLog; /** Used for inferring configuration information for a log4j's component. @author Anders Kristensen */ public class PropertyGetter { protected static final Object[] NULL_ARG = new Object[] {}; protected Object obj; protected PropertyDescriptor[] props; public interface PropertyCallback { void foundProperty(Object obj, String prefix, String name, Object value); } /** Create a new PropertyGetter for the specified Object. This is done in prepartion for invoking {@link #getProperties(PropertyGetter.PropertyCallback, String)} one or more times. @param obj the object for which to set properties */ public PropertyGetter(Object obj) throws IntrospectionException { BeanInfo bi = Introspector.getBeanInfo(obj.getClass()); props = bi.getPropertyDescriptors(); this.obj = obj; } public static void getProperties(Object obj, PropertyCallback callback, String prefix) { try { new PropertyGetter(obj).getProperties(callback, prefix); } catch (IntrospectionException ex) { LogLog.error("Failed to introspect object " + obj, ex); } } public void getProperties(PropertyCallback callback, String prefix) { for (int i = 0; i < props.length; i++) { Method getter = props[i].getReadMethod(); if (getter == null) continue; if (!isHandledType(getter.getReturnType())) { //System.err.println("Ignoring " + props[i].getName() +" " + getter.getReturnType()); continue; } String name = props[i].getName(); try { Object result = getter.invoke(obj, NULL_ARG); //System.err.println("PROP " + name +": " + result); if (result != null) { callback.foundProperty(obj, prefix, name, result); } } catch (Exception ex) { LogLog.warn("Failed to get value of property " + name); } } } protected boolean isHandledType(Class type) { return String.class.isAssignableFrom(type) || Integer.TYPE.isAssignableFrom(type) || Long.TYPE.isAssignableFrom(type) || Boolean.TYPE.isAssignableFrom(type) || Priority.class.isAssignableFrom(type); } } |
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