001 /**
002 * GRANITE DATA SERVICES
003 * Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 * This file is part of the Granite Data Services Platform.
006 *
007 * Granite Data Services is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * Granite Data Services is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 * General Public License for more details.
016 *
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this library; if not, write to the Free Software
019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 * USA, or see <http://www.gnu.org/licenses/>.
021 */
022 package org.granite.util;
023
024 import java.lang.reflect.Method;
025
026
027 public class PropertyDescriptor {
028
029 private String name;
030 private Method getter;
031 private Method setter;
032
033 public PropertyDescriptor(String propertyName, Method getter, Method setter) {
034 this.name = propertyName;
035 setReadMethod(getter);
036 setWriteMethod(setter);
037 }
038
039 public PropertyDescriptor(String propertyName, Class<?> beanClass) {
040 this.name = propertyName;
041 try {
042 setReadMethod(beanClass, createDefaultMethodName(propertyName, "is"));
043 }
044 catch (Exception e) {
045 setReadMethod(beanClass, createDefaultMethodName(propertyName, "get"));
046 }
047
048 setWriteMethod(beanClass, createDefaultMethodName(propertyName, "set"));
049 }
050
051 public String getName() {
052 return this.name;
053 }
054
055 public void setWriteMethod(Method setter) {
056 this.setter = setter;
057 }
058
059 public void setReadMethod(Method getter) {
060 this.getter = getter;
061 }
062
063 public Method getWriteMethod() {
064 return setter;
065 }
066
067 public Method getReadMethod() {
068 return getter;
069 }
070
071 @Override
072 public boolean equals(Object object) {
073 if (!(object instanceof PropertyDescriptor))
074 return false;
075
076 PropertyDescriptor pd = (PropertyDescriptor)object;
077 if (!((this.getter == null && pd.getter == null)
078 || (this.getter != null && this.getter.equals(pd.getter))))
079 return false;
080
081 if (!((this.setter == null && pd.setter == null)
082 || (this.setter != null && this.setter.equals(pd.setter))))
083 return false;
084
085 return this.getPropertyType() == pd.getPropertyType();
086 }
087
088 @Override
089 public int hashCode() {
090 int hashCode = getter != null ? getter.hashCode() : 0;
091 if (setter != null)
092 hashCode = hashCode*31 + setter.hashCode();
093 if (getPropertyType() != null)
094 hashCode = hashCode*31 + getPropertyType().hashCode();
095 return hashCode;
096 }
097
098 public Class<?> getPropertyType() {
099 if (getter != null)
100 return getter.getReturnType();
101 if (setter != null) {
102 Class<?>[] parameterTypes = setter.getParameterTypes();
103 return parameterTypes[0];
104 }
105 return null;
106 }
107
108 private String createDefaultMethodName(String propertyName, String prefix) {
109 return prefix + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1);
110 }
111
112 private void setReadMethod(Class<?> beanClass, String getterName) {
113 try {
114 Method readMethod = beanClass.getMethod(getterName, new Class[] {});
115 setReadMethod(readMethod);
116 }
117 catch (Exception e) {
118 throw new RuntimeException("Introspection exception", e);
119 }
120 }
121
122 private void setWriteMethod(Class<?> beanClass, String setterName) {
123 Method writeMethod = null;
124 try {
125 if (getter != null) {
126 writeMethod = beanClass.getMethod(setterName, new Class[] { getter.getReturnType() });
127 }
128 else {
129 Class<?> clazz = beanClass;
130 Method[] methods = null;
131 while (clazz != null && writeMethod == null) {
132 methods = clazz.getDeclaredMethods();
133 for (Method method : methods) {
134 if (setterName.equals(method.getName())) {
135 if (method.getParameterTypes().length == 1) {
136 writeMethod = method;
137 break;
138 }
139 }
140 }
141 clazz = clazz.getSuperclass();
142 }
143 }
144 }
145 catch (Exception e) {
146 throw new RuntimeException("Introspection exception", e);
147 }
148 if (writeMethod == null)
149 throw new RuntimeException("Could not find setter for property " + name);
150
151 setWriteMethod(writeMethod);
152 }
153 }