SingleValue.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.javaintegration;

import java.util.Collection;

import org.culturegraph.mf.framework.helpers.DefaultStreamReceiver;


/**
 * just records the value of the last received literal.
 * @author Markus Michael Geipel
 *
 */
public final class SingleValue extends DefaultStreamReceiver
		implements Collector<String> {

	private boolean closed;
	private String value = "";
	private Collection<String> collection;

	public SingleValue() {
		super();
		collection = null;
	}

	public SingleValue(final Collection<String> collection) {
		super();
		this.collection = collection;
	}

	public boolean isClosed() {
		return closed;
	}

	/**
	 * @return collected value, if nothing collected return ""
	 */
	public String getValue() {
		return value;
	}

	private void setValue(final String value) {
		this.value = value;
	}

	@Override
	public void startRecord(final String identifier) {
		this.setValue("");

	}

	@Override
	public void endRecord() {
		assert !closed;
		if (collection != null) {
			collection.add(value);
		}
	}

	@Override
	public void literal(final String name, final String value) {
		assert !closed;
		this.setValue(value);
	}

	@Override
	public void resetStream() {
		value = "";
		closed = false;
	}

	@Override
	public void closeStream() {
		closed = true;
	}

	@Override
	public Collection<String> getCollection() {
		return collection;
	}

	@Override
	public void setCollection(final Collection<String> collection) {
		this.collection = collection;
	}

}