/*
* Copyright 2009 the original author or authors.
*
* 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.gradle.api.internal;
import groovy.lang.Closure;
import groovy.lang.GString;
import java.util.List;
import java.util.ArrayList;
import org.gradle.api.Transformer;
public class ChainingTransformer<T> implements Transformer<T, T> {
private final List<Transformer<T, T>> transformers = new ArrayList<Transformer<T, T>>();
private final Class<T> type;
public ChainingTransformer(Class<T> type) {
this.type = type;
}
public T transform(T original) {
T value = original;
for (Transformer<T, T> transformer : transformers) {
value = type.cast(transformer.transform(value));
}
return value;
}
public void add(Transformer<T, T> transformer) {
transformers.add(transformer);
}
public void add(final Closure transformer) {
transformers.add(new Transformer<T, T>() {
public T transform(T original) {
transformer.setDelegate(original);
transformer.setResolveStrategy(Closure.DELEGATE_FIRST);
Object value = transformer.call(original);
if (type.isInstance(value)) {
return type.cast(value);
}
if (type == String.class && value instanceof GString) {
return type.cast(value.toString());
}
return original;
}
});
}
public boolean hasTransformers() {
return !transformers.isEmpty();
}
}