// Copyright 2005 The Apache Software Foundation
//
// Licensed 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.tapestry.enhance;
import java.util.Iterator;
import org.apache.hivemind.ErrorLog;
import org.apache.hivemind.Location;
import org.apache.hivemind.service.BodyBuilder;
import org.apache.hivemind.service.ClassFabUtils;
import org.apache.hivemind.util.Defense;
import org.apache.tapestry.IComponent;
import org.apache.tapestry.TapestryUtils;
import org.apache.tapestry.spec.IComponentSpecification;
import org.apache.tapestry.spec.IContainedComponent;
/**
* Injects components for which the property attribute of the <component>
* element was specified. This makes it easier to reference a particular
* component from Java code.
*
* @author Howard M. Lewis Ship
* @since 4.0
*/
public class InjectComponentWorker implements EnhancementWorker
{
private ErrorLog _errorLog;
public void performEnhancement(EnhancementOperation op,
IComponentSpecification spec)
{
Iterator i = spec.getComponentIds().iterator();
while(i.hasNext())
{
String id = (String) i.next();
IContainedComponent cc = spec.getComponent(id);
String propertyName = cc.getPropertyName();
if (propertyName != null)
{
try
{
injectComponent(op, id, propertyName, cc.getLocation());
}
catch (Exception ex)
{
_errorLog.error(EnhanceMessages.errorAddingProperty(
propertyName, op.getBaseClass(), ex), cc
.getLocation(), ex);
}
}
}
}
public void injectComponent(EnhancementOperation op, String componentId,
String propertyName, Location location)
{
Defense.notNull(op, "op");
Defense.notNull(componentId, "componentId");
Defense.notNull(propertyName, "propertyName");
Class propertyType = EnhanceUtils.extractPropertyType(op, propertyName,
null);
op.claimReadonlyProperty(propertyName);
String fieldName = "_$" + propertyName;
String classField = op.getClassReference(propertyType);
String locationField = op.addInjectedField(fieldName + "$location",
Location.class, location);
op.addField(fieldName, propertyType);
EnhanceUtils.createSimpleAccessor(op, fieldName, propertyName,
propertyType, location);
// I.e. _$fred = (IComponent) TapestryUtils.getComponent(this, "fred",
// IComponent.class,
// location)
BodyBuilder builder = new BodyBuilder();
builder.add("{0} = ({1}) ", fieldName, ClassFabUtils
.getJavaClassName(propertyType));
builder.add("{0}#getComponent(this, ", TapestryUtils.class.getName());
builder.addQuoted(componentId);
builder.add(", {0}, {1});", classField, locationField);
op.extendMethodImplementation(IComponent.class,
EnhanceUtils.FINISH_LOAD_SIGNATURE, builder.toString());
}
public void setErrorLog(ErrorLog errorLog)
{
_errorLog = errorLog;
}
}