SequenceStreamTransformer.java

/*******************************************************************************
 * 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.
 ******************************************************************************/
package org.apache.sling.scripting.sightly.impl.compiler.optimization;

import java.util.ArrayList;
import java.util.List;

import org.apache.sling.scripting.sightly.compiler.commands.CommandStream;

/**
 * Applies a list of transformations in sequence.
 */
public class SequenceStreamTransformer implements StreamTransformer {

    private List<StreamTransformer> transformers;

    public SequenceStreamTransformer(List<StreamTransformer> transformers) {
        this.transformers = new ArrayList<>(transformers);
    }

    @Override
    public CommandStream transform(CommandStream inStream) {
        CommandStream stream = inStream;
        for (StreamTransformer transformer : transformers) {
            stream = transformer.transform(stream);
        }
        return stream;
    }
}