/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2003 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 acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation", "Tapestry"
* 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"
* or "Tapestry", nor may "Apache" or "Tapestry" appear in their
* name, without prior written permission of the Apache Software Foundation.
*
* 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 TAPESTRY CONTRIBUTOR COMMUNITY
* 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.tapestry.parse;
import java.util.Iterator;
import org.apache.commons.lang.StringUtils;
import org.apache.tapestry.Tapestry;
import org.apache.tapestry.spec.IBindingSpecification;
import org.apache.tapestry.spec.IComponentSpecification;
import org.apache.tapestry.spec.IContainedComponent;
import org.apache.tapestry.util.xml.DocumentParseException;
import org.xml.sax.Attributes;
/**
* A rule for processing the copy-of attribute
* of the <component> element (in a page
* or component specification).
*
* @author Howard Lewis Ship
* @version $Id: ComponentCopyOfRule.java,v 1.5 2003/07/01 20:49:32 hlship Exp $
* @since 3.0
*
**/
public class ComponentCopyOfRule extends AbstractSpecificationRule
{
/**
* Validates that the element has either type or copy-of (not both, not neither).
* Uses the copy-of attribute to find a previously declared component
* and copies its type and bindings into the new component (on top of the stack).
*
**/
public void begin(String namespace, String name, Attributes attributes) throws Exception
{
String id = getValue(attributes, "id");
String copyOf = getValue(attributes, "copy-of");
String type = getValue(attributes, "type");
if (StringUtils.isEmpty(copyOf))
{
if (StringUtils.isEmpty(type))
throw new DocumentParseException(
Tapestry.format("SpecificationParser.missing-type-or-copy-of", id),
getResourceLocation());
return;
}
if (!StringUtils.isEmpty(type))
throw new DocumentParseException(
Tapestry.format("SpecificationParser.both-type-and-copy-of", id),
getResourceLocation());
IComponentSpecification spec = (IComponentSpecification) digester.getRoot();
IContainedComponent source = spec.getComponent(copyOf);
if (source == null)
throw new DocumentParseException(
Tapestry.format("SpecificationParser.unable-to-copy", copyOf),
getResourceLocation());
IContainedComponent target = (IContainedComponent) digester.peek();
target.setType(source.getType());
target.setCopyOf(copyOf);
Iterator i = source.getBindingNames().iterator();
while (i.hasNext())
{
String bindingName = (String) i.next();
IBindingSpecification binding = source.getBinding(bindingName);
target.setBinding(bindingName, binding);
}
}
}