/* $Id: SetPropertyRule.java 992060 2010-09-02 19:09:47Z simonetripodi $
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.digester;
import java.beans.PropertyDescriptor;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.DynaBean;
import org.apache.commons.beanutils.DynaProperty;
import org.apache.commons.beanutils.PropertyUtils;
import org.xml.sax.Attributes;
/**
* Rule implementation that sets an individual property on the object at the
* top of the stack, based on attributes with specified names.
*/
public class SetPropertyRule extends Rule {
// ----------------------------------------------------------- Constructors
/**
* Construct a "set property" rule with the specified name and value
* attributes.
*
* @param digester The digester with which this rule is associated
* @param name Name of the attribute that will contain the name of the
* property to be set
* @param value Name of the attribute that will contain the value to which
* the property should be set
*
* @deprecated The digester instance is now set in the {@link Digester#addRule} method.
* Use {@link #SetPropertyRule(String name, String value)} instead.
*/
@Deprecated
public SetPropertyRule(Digester digester, String name, String value) {
this(name, value);
}
/**
* Construct a "set property" rule with the specified name and value
* attributes.
*
* @param name Name of the attribute that will contain the name of the
* property to be set
* @param value Name of the attribute that will contain the value to which
* the property should be set
*/
public SetPropertyRule(String name, String value) {
this.name = name;
this.value = value;
}
// ----------------------------------------------------- Instance Variables
/**
* The attribute that will contain the property name.
*/
protected String name = null;
/**
* The attribute that will contain the property value.
*/
protected String value = null;
// --------------------------------------------------------- Public Methods
/**
* Process the beginning of this element.
*
* @param attributes The attribute list of this element
*
* @exception NoSuchMethodException if the bean does not
* have a writeable property of the specified name
*/
@Override
public void begin(Attributes attributes) throws Exception {
if (attributes.getLength() == 0 ) {
return;
}
// Identify the actual property name and value to be used
String actualName = null;
String actualValue = null;
for (int i = 0; i < attributes.getLength(); i++) {
String name = attributes.getLocalName(i);
if ("".equals(name)) {
name = attributes.getQName(i);
}
String value = attributes.getValue(i);
if (name.equals(this.name)) {
actualName = value;
} else if (name.equals(this.value)) {
actualValue = value;
}
}
// Get a reference to the top object
Object top = digester.peek();
// Log some debugging information
if (digester.log.isDebugEnabled()) {
digester.log.debug("[SetPropertyRule]{" + digester.match +
"} Set " + top.getClass().getName() + " property " +
actualName + " to " + actualValue);
}
// Force an exception if the property does not exist
// (BeanUtils.setProperty() silently returns in this case)
//
// This code should probably use PropertyUtils.isWriteable(),
// like SetPropertiesRule does.
if (top instanceof DynaBean) {
DynaProperty desc =
((DynaBean) top).getDynaClass().getDynaProperty(actualName);
if (desc == null) {
throw new NoSuchMethodException
("Bean has no property named " + actualName);
}
} else /* this is a standard JavaBean */ {
PropertyDescriptor desc =
PropertyUtils.getPropertyDescriptor(top, actualName);
if (desc == null) {
throw new NoSuchMethodException
("Bean has no property named " + actualName);
}
}
// Set the property (with conversion as necessary)
BeanUtils.setProperty(top, actualName, actualValue);
}
/**
* Render a printable version of this Rule.
*/
@Override
public String toString() {
StringBuffer sb = new StringBuffer("SetPropertyRule[");
sb.append("name=");
sb.append(name);
sb.append(", value=");
sb.append(value);
sb.append("]");
return (sb.toString());
}
}