org.apache.tuscany.sca.core.databinding.transformers.Collection2CollectionTransformer Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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,
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*/
package org.apache.tuscany.sca.core.databinding.transformers;
import java.util.Collection;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.core.UtilityExtensionPoint;
import org.apache.tuscany.sca.databinding.BaseTransformer;
import org.apache.tuscany.sca.databinding.Mediator;
import org.apache.tuscany.sca.databinding.PullTransformer;
import org.apache.tuscany.sca.databinding.TransformationContext;
import org.apache.tuscany.sca.databinding.TransformationException;
import org.apache.tuscany.sca.interfacedef.DataType;
/**
* This is a special transformer to transform the output from one IDL to the
* other one
*
* @version $Rev: 928344 $ $Date: 2010-03-27 22:25:51 -0700 (Sat, 27 Mar 2010) $
*/
public class Collection2CollectionTransformer extends BaseTransformer implements
PullTransformer {
private static final String JAVA_COLLECTION = "java:collection";
protected Mediator mediator;
public Collection2CollectionTransformer(ExtensionPointRegistry registry) {
super();
this.mediator = registry.getExtensionPoint(UtilityExtensionPoint.class).getUtility(Mediator.class);
}
@Override
public String getSourceDataBinding() {
return JAVA_COLLECTION;
}
@Override
public String getTargetDataBinding() {
return JAVA_COLLECTION;
}
/**
* @see org.apache.tuscany.sca.databinding.BaseTransformer#getSourceType()
*/
@Override
protected Class getSourceType() {
return Collection.class;
}
/**
* @see org.apache.tuscany.sca.databinding.BaseTransformer#getTargetType()
*/
@Override
protected Class getTargetType() {
return Collection.class;
}
/**
* @see org.apache.tuscany.sca.databinding.Transformer#getWeight()
*/
@Override
public int getWeight() {
return 10;
}
@SuppressWarnings("unchecked")
public Collection transform(Collection sourceCollection, TransformationContext context) {
try {
if (sourceCollection == null) {
return null;
}
DataType sourceType = context.getSourceDataType();
DataType targetType = context.getTargetDataType();
Collection targetCollection = createCollection(targetType.getPhysical());
for (Object sourceItem : sourceCollection) {
Object targetItem =
mediator.mediate(sourceItem, sourceType.getLogical(), targetType.getLogical(), context
.getMetadata());
targetCollection.add(targetItem);
}
return targetCollection;
} catch (Exception e) {
throw new TransformationException(e);
}
}
private Collection createCollection(Class collectionClass) throws Exception {
return (Collection) collectionClass.newInstance();
}
}