/*
* 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.
*/
/*
* $Id: CreateValidatorCommand.java 471910 2006-11-06 22:44:56Z gvanmatre $
*/
package org.apache.shale.clay.component.chain;
import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;
import javax.faces.validator.Validator;
import org.apache.commons.chain.Context;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.shale.clay.config.beans.AttributeBean;
import org.apache.shale.clay.config.beans.ComponentBean;
/**
* <p>
* Creates an object implementing the {@link Validator} interface and assigns it
* to the <code>parent</code> from the {@link ClayContext}.
* </p>
*/
public class CreateValidatorCommand extends AbstractCommand {
/**
* <p>
* Common Logger utility.
* </p>
*/
private static Log log;
static {
log = LogFactory.getLog(CreateValidatorCommand.class);
}
/**
* <p>
* Creates a faces validator object that is registered in the
* <strong>faces-config.xml</strong> file and assigns it to the parent.
* </p>
*
* @param context commons chains
* @return <code>true</code> if the chain is final
* @exception Exception propagated to the top chain
*/
public boolean execute(Context context) throws Exception {
boolean isFinal = false;
ClayContext clayContext = (ClayContext) context;
if (clayContext == null) {
throw new NullPointerException(getMessages()
.getMessage("clay.null.clayContext"));
}
UIComponent child = (UIComponent) clayContext.getChild();
if (child == null) {
throw new NullPointerException(getMessages()
.getMessage("clay.null.childComponent"));
}
ComponentBean displayElement = clayContext.getDisplayElement();
if (displayElement == null) {
throw new NullPointerException(getMessages()
.getMessage("clay.null.componentBean"));
}
EditableValueHolder parent = (EditableValueHolder) clayContext
.getParent();
if (parent == null) {
throw new NullPointerException(getMessages()
.getMessage("clay.null.parentComponent"));
}
FacesContext facesContext = clayContext.getFacesContext();
if (facesContext == null) {
throw new NullPointerException(getMessages()
.getMessage("clay.null.facesContext"));
}
Validator validator = null;
try {
AttributeBean attr = displayElement.getAttribute("binding");
if (attr != null && isValueReference(attr.getValue())) {
clayContext.setAttribute(attr);
String expr = replaceMnemonic(clayContext);
ValueBinding vb = facesContext.getApplication()
.createValueBinding(expr);
validator = (Validator) vb.getValue(facesContext);
} else {
validator = facesContext.getApplication().createValidator(
displayElement.getComponentType());
}
} catch (Exception e) {
log.error(getMessages().getMessage("create.validator.error",
new Object[] { displayElement }), e);
throw e;
}
parent.addValidator(validator);
// reassign the child to the validator for the
// AssignPropertiesCommand
clayContext.setChild(validator);
return isFinal;
}
}