001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.servicemix.jbi.management;
018
019 import java.beans.PropertyDescriptor;
020 import java.lang.reflect.InvocationTargetException;
021 import java.util.ArrayList;
022 import java.util.List;
023
024 import javax.management.IntrospectionException;
025 import javax.management.MBeanAttributeInfo;
026 import javax.management.ReflectionException;
027
028 import org.apache.commons.beanutils.PropertyUtilsBean;
029
030 /**
031 * A Helper class to build a list of MBeanAttributInfos
032 *
033 * @version $Revision: 564607 $
034 */
035 public class AttributeInfoHelper {
036 private PropertyUtilsBean beanUtil = new PropertyUtilsBean();
037
038 private List<MBeanAttributeInfo> list = new ArrayList<MBeanAttributeInfo>();
039
040 /**
041 * Add an attribute
042 *
043 * @param theObject
044 * @param name
045 * @param description
046 * @throws ReflectionException
047 *
048 */
049 public void addAttribute(Object theObject, String name, String description) throws ReflectionException {
050 PropertyDescriptor pd;
051 try {
052 pd = beanUtil.getPropertyDescriptor(theObject, name);
053 MBeanAttributeInfo info = new MBeanAttributeInfo(name, description, pd.getReadMethod(), pd.getWriteMethod());
054 list.add(info);
055 } catch (IntrospectionException e) {
056 throw new ReflectionException(e);
057 } catch (IllegalAccessException e) {
058 throw new ReflectionException(e);
059 } catch (InvocationTargetException e) {
060 throw new ReflectionException(e);
061 } catch (NoSuchMethodException e) {
062 throw new ReflectionException(e);
063 }
064
065 }
066
067 /**
068 * Get array of MBeanAttriubteInfos registered
069 *
070 * @return MBeanAttributeInfos
071 */
072 public MBeanAttributeInfo[] getAttributeInfos() {
073 MBeanAttributeInfo[] result = new MBeanAttributeInfo[list.size()];
074 list.toArray(result);
075 return result;
076 }
077
078 /**
079 * clear the internal list
080 */
081 public void clear() {
082 list.clear();
083 }
084
085 /**
086 * Join two MBeanAttributeInfo[] arrays
087 *
088 * @param attrs1
089 * @param attrs2
090 * @return new MBeanAttributeInfo array containing contents of attr1 and
091 * attr2
092 */
093 public static MBeanAttributeInfo[] join(MBeanAttributeInfo[] attrs1, MBeanAttributeInfo[] attrs2) {
094 MBeanAttributeInfo[] result = null;
095 int length = 0;
096 int startPos = 0;
097 if (attrs1 != null) {
098 length = attrs1.length;
099 }
100 if (attrs2 != null) {
101 length += attrs2.length;
102 }
103
104 result = new MBeanAttributeInfo[length];
105 if (attrs1 != null) {
106 System.arraycopy(attrs1, 0, result, startPos, attrs1.length);
107 startPos = attrs1.length;
108 }
109 if (attrs2 != null) {
110 System.arraycopy(attrs2, 0, result, startPos, attrs2.length);
111 }
112 return result;
113 }
114 }