/*
* Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package com.sun.beans.decoder;
import com.sun.beans.finder.MethodFinder;
import java.beans.IndexedPropertyDescriptor;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import sun.reflect.misc.MethodUtil;
/**
* This class is intended to handle <property> element.
* This element simplifies access to the properties.
* If the {@code index} attribute is specified
* this element uses additional {@code int} parameter.
* If the {@code name} attribute is not specified
* this element uses method "get" as getter
* and method "set" as setter.
* This element defines getter if it contains no argument.
* It returns the value of the property in this case.
* For example:<pre>
* <property name="object" index="10"/></pre>
* is shortcut to<pre>
* <method name="getObject">
* <int>10</int>
* </method></pre>
* which is equivalent to {@code getObject(10)} in Java code.
* This element defines setter if it contains one argument.
* It does not return the value of the property in this case.
* For example:<pre>
* <property><int>0</int></property></pre>
* is shortcut to<pre>
* <method name="set">
* <int>0</int>
* </method></pre>
* which is equivalent to {@code set(0)} in Java code.
* <p>The following atributes are supported:
* <dl>
* <dt>name
* <dd>the property name
* <dt>index
* <dd>the property index
* <dt>id
* <dd>the identifier of the variable that is intended to store the result
* </dl>
*
* @since 1.7
*
* @author Sergey A. Malenkov
*/
final class PropertyElementHandler extends AccessorElementHandler {
static final String GETTER = "get"; // NON-NLS: the getter prefix
static final String SETTER = "set"; // NON-NLS: the setter prefix
private Integer index;
/**
* Parses attributes of the element.
* The following atributes are supported:
* <dl>
* <dt>name
* <dd>the property name
* <dt>index
* <dd>the property index
* <dt>id
* <dd>the identifier of the variable that is intended to store the result
* </dl>
*
* @param name the attribute name
* @param value the attribute value
*/
@Override
public void addAttribute(String name, String value) {
if (name.equals("index")) { // NON-NLS: the attribute name
this.index = Integer.valueOf(value);
} else {
super.addAttribute(name, value);
}
}
/**
* Tests whether the value of this element can be used
* as an argument of the element that contained in this one.
*
* @return {@code true} if the value of this element should be used
* as an argument of the element that contained in this one,
* {@code false} otherwise
*/
@Override
protected boolean isArgument() {
return false; // non-static accessor cannot be used an argument
}
/**
* Returns the value of the property with specified {@code name}.
*
* @param name the name of the property
* @return the value of the specified property
*/
@Override
protected Object getValue(String name) {
try {
return getPropertyValue(getContextBean(), name, this.index);
}
catch (Exception exception) {
getOwner().handleException(exception);
}
return null;
}
/**
* Sets the new value for the property with specified {@code name}.
*
* @param name the name of the property
* @param value the new value for the specified property
*/
@Override
protected void setValue(String name, Object value) {
try {
setPropertyValue(getContextBean(), name, this.index, value);
}
catch (Exception exception) {
getOwner().handleException(exception);
}
}
/**
* Performs the search of the getter for the property
* with specified {@code name} in specified class
* and returns value of the property.
*
* @param bean the context bean that contains property
* @param name the name of the property
* @param index the index of the indexed property
* @return the value of the property
* @throws IllegalAccessException if the property is not accesible
* @throws IntrospectionException if the bean introspection is failed
* @throws InvocationTargetException if the getter cannot be invoked
* @throws NoSuchMethodException if the getter is not found
*/
private static Object getPropertyValue(Object bean, String name, Integer index) throws IllegalAccessException, IntrospectionException, InvocationTargetException, NoSuchMethodException {
Class<?> type = bean.getClass();
if (index == null) {
return MethodUtil.invoke(findGetter(type, name), bean, new Object[] {});
} else if (type.isArray() && (name == null)) {
return Array.get(bean, index);
} else {
return MethodUtil.invoke(findGetter(type, name, int.class), bean, new Object[] {index});
}
}
/**
* Performs the search of the setter for the property
* with specified {@code name} in specified class
* and updates value of the property.
*
* @param bean the context bean that contains property
* @param name the name of the property
* @param index the index of the indexed property
* @param value the new value for the property
* @throws IllegalAccessException if the property is not accesible
* @throws IntrospectionException if the bean introspection is failed
* @throws InvocationTargetException if the setter cannot be invoked
* @throws NoSuchMethodException if the setter is not found
*/
private static void setPropertyValue(Object bean, String name, Integer index, Object value) throws IllegalAccessException, IntrospectionException, InvocationTargetException, NoSuchMethodException {
Class<?> type = bean.getClass();
Class<?> param = (value != null)
? value.getClass()
: null;
if (index == null) {
MethodUtil.invoke(findSetter(type, name, param), bean, new Object[] {value});
} else if (type.isArray() && (name == null)) {
Array.set(bean, index, value);
} else {
MethodUtil.invoke(findSetter(type, name, int.class, param), bean, new Object[] {index, value});
}
}
/**
* Performs the search of the getter for the property
* with specified {@code name} in specified class.
*
* @param type the class that contains method
* @param name the name of the property
* @param args the method arguments
* @return method object that represents found getter
* @throws IntrospectionException if the bean introspection is failed
* @throws NoSuchMethodException if method is not found
*/
private static Method findGetter(Class<?> type, String name, Class<?>...args) throws IntrospectionException, NoSuchMethodException {
if (name == null) {
return MethodFinder.findInstanceMethod(type, GETTER, args);
}
PropertyDescriptor pd = getProperty(type, name);
if (args.length == 0) {
Method method = pd.getReadMethod();
if (method != null) {
return method;
}
} else if (pd instanceof IndexedPropertyDescriptor) {
IndexedPropertyDescriptor ipd = (IndexedPropertyDescriptor) pd;
Method method = ipd.getIndexedReadMethod();
if (method != null) {
return method;
}
}
throw new IntrospectionException("Could not find getter for the " + name + " property");
}
/**
* Performs the search of the setter for the property
* with specified {@code name} in specified class.
*
* @param type the class that contains method
* @param name the name of the property
* @param args the method arguments
* @return method object that represents found setter
* @throws IntrospectionException if the bean introspection is failed
* @throws NoSuchMethodException if method is not found
*/
private static Method findSetter(Class<?> type, String name, Class<?>...args) throws IntrospectionException, NoSuchMethodException {
if (name == null) {
return MethodFinder.findInstanceMethod(type, SETTER, args);
}
PropertyDescriptor pd = getProperty(type, name);
if (args.length == 1) {
Method method = pd.getWriteMethod();
if (method != null) {
return method;
}
} else if (pd instanceof IndexedPropertyDescriptor) {
IndexedPropertyDescriptor ipd = (IndexedPropertyDescriptor) pd;
Method method = ipd.getIndexedWriteMethod();
if (method != null) {
return method;
}
}
throw new IntrospectionException("Could not find setter for the " + name + " property");
}
/**
* Performs the search of the descriptor for the property
* with specified {@code name} in specified class.
*
* @param type the class to introspect
* @param name the property name
* @return descriptor for the named property
* @throws IntrospectionException if property descriptor is not found
*/
private static PropertyDescriptor getProperty(Class<?> type, String name) throws IntrospectionException {
for (PropertyDescriptor pd : Introspector.getBeanInfo(type).getPropertyDescriptors()) {
if (name.equals(pd.getName())) {
return pd;
}
}
throw new IntrospectionException("Could not find the " + name + " property descriptor");
}
}