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216
test/org/apache/catalina/tribes/demos/IntrospectionUtils.java
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216
test/org/apache/catalina/tribes/demos/IntrospectionUtils.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.catalina.tribes.demos;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import java.util.Hashtable;
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import org.apache.juli.logging.Log;
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import org.apache.juli.logging.LogFactory;
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/**
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* Utils for introspection and reflection
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*/
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public final class IntrospectionUtils {
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private static final Log log = LogFactory.getLog(IntrospectionUtils.class);
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/*
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* Find a method with the right name If found, call the method ( if param is
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* int or boolean we'll convert value to the right type before) - that means
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* you can have setDebug(1).
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*/
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@SuppressWarnings("null")
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public static boolean setProperty(Object o, String name, String value) {
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if (log.isDebugEnabled())
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log.debug("IntrospectionUtils: setProperty(" +
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o.getClass() + " " + name + "=" + value + ")");
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String setter = "set" + capitalize(name);
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try {
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Method methods[] = findMethods(o.getClass());
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Method setPropertyMethodVoid = null;
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Method setPropertyMethodBool = null;
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// First, the ideal case - a setFoo( String ) method
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for (int i = 0; i < methods.length; i++) {
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Class<?> paramT[] = methods[i].getParameterTypes();
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if (setter.equals(methods[i].getName()) && paramT.length == 1
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&& "java.lang.String".equals(paramT[0].getName())) {
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methods[i].invoke(o, new Object[] { value });
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return true;
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}
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}
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// Try a setFoo ( int ) or ( boolean )
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for (int i = 0; i < methods.length; i++) {
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boolean ok = true;
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if (setter.equals(methods[i].getName())
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&& methods[i].getParameterTypes().length == 1) {
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// match - find the type and invoke it
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Class<?> paramType = methods[i].getParameterTypes()[0];
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Object params[] = new Object[1];
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// Try a setFoo ( int )
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if ("java.lang.Integer".equals(paramType.getName())
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|| "int".equals(paramType.getName())) {
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try {
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params[0] = Integer.valueOf(value);
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} catch (NumberFormatException ex) {
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ok = false;
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}
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// Try a setFoo ( long )
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}else if ("java.lang.Long".equals(paramType.getName())
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|| "long".equals(paramType.getName())) {
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try {
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params[0] = Long.valueOf(value);
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} catch (NumberFormatException ex) {
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ok = false;
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}
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// Try a setFoo ( boolean )
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} else if ("java.lang.Boolean".equals(paramType.getName())
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|| "boolean".equals(paramType.getName())) {
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params[0] = Boolean.valueOf(value);
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// Try a setFoo ( InetAddress )
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} else if ("java.net.InetAddress".equals(paramType
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.getName())) {
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try {
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params[0] = InetAddress.getByName(value);
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} catch (UnknownHostException exc) {
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if (log.isDebugEnabled())
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log.debug("IntrospectionUtils: Unable to resolve host name:" + value);
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ok = false;
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}
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// Unknown type
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} else {
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if (log.isDebugEnabled())
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log.debug("IntrospectionUtils: Unknown type " +
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paramType.getName());
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}
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if (ok) {
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methods[i].invoke(o, params);
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return true;
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}
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}
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// save "setProperty" for later
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if ("setProperty".equals(methods[i].getName())) {
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if (methods[i].getReturnType()==Boolean.TYPE){
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setPropertyMethodBool = methods[i];
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}else {
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setPropertyMethodVoid = methods[i];
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}
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}
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}
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// Ok, no setXXX found, try a setProperty("name", "value")
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if (setPropertyMethodBool != null || setPropertyMethodVoid != null) {
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Object params[] = new Object[2];
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params[0] = name;
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params[1] = value;
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if (setPropertyMethodBool != null) {
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try {
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return ((Boolean) setPropertyMethodBool.invoke(o,
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params)).booleanValue();
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}catch (IllegalArgumentException biae) {
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//the boolean method had the wrong
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//parameter types. lets try the other
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if (setPropertyMethodVoid!=null) {
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setPropertyMethodVoid.invoke(o, params);
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return true;
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}else {
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throw biae;
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}
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}
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} else {
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setPropertyMethodVoid.invoke(o, params);
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return true;
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}
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}
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} catch (IllegalArgumentException ex2) {
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log.warn("IAE " + o + " " + name + " " + value, ex2);
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} catch (SecurityException ex1) {
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if (log.isDebugEnabled())
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log.debug("IntrospectionUtils: SecurityException for " +
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o.getClass() + " " + name + "=" + value + ")", ex1);
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} catch (IllegalAccessException iae) {
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if (log.isDebugEnabled())
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log.debug("IntrospectionUtils: IllegalAccessException for " +
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o.getClass() + " " + name + "=" + value + ")", iae);
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} catch (InvocationTargetException ie) {
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Throwable cause = ie.getCause();
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if (cause instanceof ThreadDeath) {
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throw (ThreadDeath) cause;
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}
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if (cause instanceof VirtualMachineError) {
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throw (VirtualMachineError) cause;
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}
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if (log.isDebugEnabled())
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log.debug("IntrospectionUtils: InvocationTargetException for " +
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o.getClass() + " " + name + "=" + value + ")", ie);
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}
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return false;
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}
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/*
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* Reverse of Introspector.decapitalize
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*/
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public static String capitalize(String name) {
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if (name == null || name.length() == 0) {
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return name;
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}
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char chars[] = name.toCharArray();
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chars[0] = Character.toUpperCase(chars[0]);
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return new String(chars);
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}
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// -------------------- other utils --------------------
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/**
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* @deprecated Not used, but code must be updated to call it
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*/
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@Deprecated
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public static void clear() {
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objectMethods.clear();
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}
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static Hashtable<Class<?>,Method[]> objectMethods = new Hashtable<>();
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public static Method[] findMethods(Class<?> c) {
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Method methods[] = objectMethods.get(c);
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if (methods != null)
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return methods;
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methods = c.getMethods();
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objectMethods.put(c, methods);
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return methods;
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}
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}
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