Count.java

/*
 * Copyright 2013, 2014 Deutsche Nationalbibliothek
 *
 * 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.culturegraph.mf.metamorph.functions;

import org.culturegraph.mf.metamorph.api.helpers.AbstractStatefulFunction;

/**
 * Counts the number of values received.
 *
 * @author Markus Michael Geipel
 *
 */
public final class Count extends AbstractStatefulFunction {

	private int count;

	@Override
	public String process(final String value) {
		++count;
		return String.valueOf(count);
	}

	@Override
	protected void reset() {
		count = 0;
	}

	@Override
	protected boolean doResetOnEntityChange() {
		return false;
	}

}