QualifierConverter.java

/*
 * Copyright 2012 Red Hat, Inc. and/or its affiliates.
 *
 * 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.kie.workbench.common.services.backend.kmodule.converters;

import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import org.drools.core.util.AbstractXStreamConverter;
import org.kie.workbench.common.services.shared.kmodule.QualifierModel;

import java.util.Map;

public class QualifierConverter
        extends AbstractXStreamConverter {

    public QualifierConverter() {
        super(QualifierModel.class);
    }

    public void marshal(Object value, HierarchicalStreamWriter writer, MarshallingContext context) {
        QualifierModel qualifier = (QualifierModel) value;
        writer.addAttribute("type", qualifier.getType());
        if (qualifier.getValue() != null) {
            writer.addAttribute("value", qualifier.getValue());
        } else {
            for (Map.Entry<String, String> entry : qualifier.getArguments().entrySet()) {
                writer.startNode("arg");
                writer.addAttribute("key", entry.getKey());
                writer.addAttribute("value", entry.getValue());
                writer.endNode();
            }
        }
    }

    public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
        final QualifierModel qualifier = new QualifierModel();
        qualifier.setType(reader.getAttribute("type"));
        String value = reader.getAttribute("value");

        if (value != null) {
            qualifier.setValue(value);
        } else {
            readNodes( reader, new AbstractXStreamConverter.NodeReader() {
                public void onNode(HierarchicalStreamReader reader,
                                   String name,
                                   String value) {
                    if ( "arg".equals( name ) ) {
                        qualifier.addArgument(reader.getAttribute("key"), reader.getAttribute("value"));
                    }
                }
            } );
        }

        return qualifier;
    }
}