/* ====================================================================
* 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
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*
* 5. Products derived from this software may not be called "Apache"
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* 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.pageload;
import java.util.Iterator;
import org.apache.tapestry.IBinding;
import org.apache.tapestry.IComponent;
import org.apache.tapestry.IResourceResolver;
import org.apache.tapestry.binding.ExpressionBinding;
import org.apache.tapestry.spec.IComponentSpecification;
import org.apache.tapestry.spec.IParameterSpecification;
/**
* For all parameters in the examined component that have default values, but are not bound,
* automatically add an ExpressionBinding with the default value.
*
* @author mindbridge
* @version $Id: EstablishDefaultParameterValuesVisitor.java,v 1.1 2003/06/21 21:25:21 mindbridge Exp $
* @since 3.0
*/
public class EstablishDefaultParameterValuesVisitor implements IComponentVisitor
{
private IResourceResolver _resolver;
public EstablishDefaultParameterValuesVisitor(IResourceResolver resolver)
{
_resolver = resolver;
}
/**
* @see org.apache.tapestry.pageload.IComponentVisitor#visitComponent(org.apache.tapestry.IComponent)
*/
public void visitComponent(IComponent component)
{
IComponentSpecification spec = component.getSpecification();
Iterator i = spec.getParameterNames().iterator();
while (i.hasNext())
{
String name = (String) i.next();
IParameterSpecification parameterSpec = spec.getParameter(name);
String defaultValue = parameterSpec.getDefaultValue();
if (defaultValue != null && component.getBinding(name) == null) {
// there is no binding for this parameter. bind it to the default value
IBinding binding = new ExpressionBinding(_resolver, component, defaultValue, parameterSpec.getLocation());
component.setBinding(name, binding);
}
}
}
}