AbstractFilter.java

/*
 * Copyright 2016 Christoph Böhme
 *
 * 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.api.helpers;

/**
 * Base class for functions that act as filters.
 *
 * @author Markus Michael Geipel
 */
public abstract class AbstractFilter extends AbstractSimpleStatelessFunction {

	private String string;

	@Override
	public final String process(final String value) {
		if(accept(value)){
			return value;
		}
		return null;
	}

	protected abstract boolean accept(String value);

	protected final  String getString() {
		return string;
	}

	public final void setString(final String string) {
		this.string = string;
	}

}