/**
* Copyright (C) 2012-2017 52°North Initiative for Geospatial Open Source
* Software GmbH
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* If the program is linked with libraries which are licensed under one of
* the following licenses, the combination of the program with the linked
* library is not considered a "derivative work" of the program:
*
* - Apache License, version 2.0
* - Apache Software License, version 1.0
* - GNU Lesser General Public License, version 3
* - Mozilla Public License, versions 1.0, 1.1 and 2.0
* - Common Development and Distribution License (CDDL), version 1.0
*
* Therefore the distribution of the program linked with libraries licensed
* under the aforementioned licenses, is permitted by the copyright holders
* if the distribution is compliant with both the GNU General Public
* License version 2 and the aforementioned licenses.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*/
package org.n52.sos.decode.xml.stream;
import java.util.Map;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import org.n52.sos.ogc.ows.OwsExceptionReport;
/**
* TODO JavaDoc
*
* @author Christian Autermann
*/
public class ChoiceReader<T> extends XmlReader<T> {
private final Map<QName, ? extends XmlReader<? extends T>> delegates;
private T t;
public ChoiceReader(Map<QName, ? extends XmlReader<? extends T>> delegates) {
this.delegates = delegates;
}
@Override
protected void read(QName name)
throws XMLStreamException, OwsExceptionReport {
XmlReader<? extends T> delegate = delegates.get(name);
if (this.t == null && delegate != null) {
this.t = delegate(delegate);
} else {
ignore();
}
}
@Override
protected T finish() {
return t;
}
}