CompositeStringTransformer.java

/*
 *  This file is part of the Wayback archival access software
 *   (http://archive-access.sourceforge.net/projects/wayback/).
 *
 *  Licensed to the Internet Archive (IA) by one or more individual
 *  contributors.
 *
 *  The IA 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.archive.wayback.replay.html.transformer;

import java.util.List;

import org.archive.wayback.replay.html.ReplayParseContext;
import org.archive.wayback.replay.html.StringTransformer;
import org.archive.wayback.replay.html.rewrite.RewriteRule;

/**
 * {@link StringTransformer} that aggregates multiple sub-
 * {@code StringTransformer}s that are applied in sequence. Formerly known as
 * {@code MultiRegexReplaceStringTransformer}.
 */
public class CompositeStringTransformer extends RewriteRule implements
		StringTransformer {

	List<StringTransformer> transformers;

	public String transform(ReplayParseContext context, String input) {
		if (transformers == null) {
			return input;
		}
		for (StringTransformer t : transformers) {
			input = t.transform(context, input);
		}
		return input;
	}

	/**
	 * @return the transformers
	 */
	public List<StringTransformer> getTransformers() {
		return transformers;
	}

	/**
	 * @param transformers the transformers to set
	 */
	public void setTransformers(List<StringTransformer> transformers) {
		this.transformers = transformers;
	}

	@Override
	public String rewrite(ReplayParseContext context, String policy,
			String input) {
		return transform(context, input);
	}

}