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Posted to dev@commons.apache.org by sa...@apache.org on 2002/01/09 21:26:06 UTC
cvs commit: jakarta-commons/digester/src/java/org/apache/commons/digester SetRootRule.java
sanders 02/01/09 12:26:05
Added: digester/src/java/org/apache/commons/digester
SetRootRule.java
Log:
Handy rule for acessing the root object in the stack.
Revision Changes Path
1.1 jakarta-commons/digester/src/java/org/apache/commons/digester/SetRootRule.java
Index: SetRootRule.java
===================================================================
/*
* $Header: /home/cvs/jakarta-commons/digester/src/java/org/apache/commons/digester/SetRootRule.java,v 1.1 2002/01/09 20:26:05 sanders Exp $
* $Revision: 1.1 $
* $Date: 2002/01/09 20:26:05 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.commons.digester;
import java.lang.ClassLoader;
import java.lang.reflect.Method;
import org.xml.sax.Attributes;
import org.apache.commons.beanutils.MethodUtils;
/**
* Rule implementation that calls a method on the root object on the stack,
* passing the top object (child) as an argument.
*
* @author Scott Sanders
* @version $Revision: 1.1 $ $Date: 2002/01/09 20:26:05 $
*/
public class SetRootRule extends Rule {
// ----------------------------------------------------------- Constructors
/**
* Construct a "set root" rule with the specified method name. The
* method's argument type is assumed to be the class of the
* child object.
*
* @param digester The associated Digester
* @param methodName Method name of the parent method to call
*/
public SetRootRule(Digester digester, String methodName) {
this(digester, methodName, null);
}
/**
* Construct a "set next" rule with the specified method name.
*
* @param digester The associated Digester
* @param methodName Method name of the parent method to call
* @param paramType Java class of the parent method's argument
* (if you wish to use a primitive type, specify the corresonding
* Java wrapper class instead, such as <code>java.lang.Boolean</code>
* for a <code>boolean</code> parameter)
*/
public SetRootRule(Digester digester, String methodName,
String paramType) {
super(digester);
this.methodName = methodName;
this.paramType = paramType;
}
// ----------------------------------------------------- Instance Variables
/**
* The method name to call on the parent object.
*/
protected String methodName = null;
/**
* The Java class name of the parameter type expected by the method.
*/
protected String paramType = null;
// --------------------------------------------------------- Public Methods
/**
* Process the end of this element.
*/
public void end() throws Exception {
// Identify the objects to be used
Object child = digester.peek(0);
Object parent = digester.root;
if (digester.log.isDebugEnabled()) {
if (parent == null) {
digester.log.debug("Call [NULL ROOT]." +
methodName + "(" + child + ")");
} else {
digester.log.debug("Call " + parent.getClass().getName() + "." +
methodName + "(" + child + ")");
}
}
// Call the specified method
Class paramTypes[] = new Class[1];
if (paramType != null) {
paramTypes[0] =
digester.getClassLoader().loadClass(paramType);
} else {
paramTypes[0] = child.getClass();
}
MethodUtils.invokeExactMethod(parent, methodName,
new Object[]{ child }, paramTypes);
}
/**
* Render a printable version of this Rule.
*/
public String toString() {
StringBuffer sb = new StringBuffer("SetRootRule[");
sb.append("methodName=");
sb.append(methodName);
sb.append(", paramType=");
sb.append(paramType);
sb.append("]");
return (sb.toString());
}
}
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