org.eclipse.skalli.core/src/main/java/org/eclipse/skalli/core/xstream/NoopConverter.java

/*******************************************************************************
 * Copyright (c) 2010-2014 SAP AG and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     SAP AG - initial API and implementation
 *******************************************************************************/
package org.eclipse.skalli.core.xstream;

import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;

/**
 * Converter for skipping unknown tags when unmarshaling entities or configurations.
 * Be careful using this converter to unmarshal entries of collections that cannot
 * handle <code>null</code> pointers, like for example <code>TreeSet</code>.
 */
public class NoopConverter implements Converter {

    @Override
    public boolean canConvert(@SuppressWarnings("rawtypes") Class type) {
        return type.equals(Noop.class);
    }

    /**
     * This method does nothing.
     */
    @Override
    public void marshal(Object source, HierarchicalStreamWriter writer, MarshallingContext contex) {
    }

    /**
     * This method always returns <code>null</code>.
     */
    @Override
    public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
        return null;
    }
}