trunk/core/src/main/java/org/apache/struts2/views/xslt/MapAdapter.java

/*
 * $Id$
 *
 * Copyright 2006 The Apache Software Foundation.
 *
 * 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.apache.struts2.views.xslt;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.w3c.dom.Node;

/**
 * MapAdapter adapters a java.util.Map type to an XML DOM with the following
 * structure:
 * <pre>
 * 	<myMap>
 * 		<entry>
 * 			<key>...</key>
 * 			<value>...</value>
 * 		</entry>
 * 		...
 * 	</myMap>
 * </pre>
 */
public class MapAdapter extends AbstractAdapterElement {

    public MapAdapter() { }

    public MapAdapter(AdapterFactory adapterFactory, AdapterNode parent, String propertyName, Map value) {
        setContext( adapterFactory, parent, propertyName, value );
    }

    public Map map() {
        return (Map)getPropertyValue();
    }

    protected List<Node> buildChildAdapters() {
        List<Node> children = new ArrayList<Node>(map().entrySet().size());

        for (Object o : map().entrySet()) {
            Map.Entry entry = (Map.Entry) o;
            Object key = entry.getKey();
            Object value = entry.getValue();
            EntryElement child = new EntryElement(
                    getAdapterFactory(), this, "entry", key, value);
            children.add(child);
        }

        return children;
    }

    class EntryElement extends AbstractAdapterElement {
        Object key, value;

        public EntryElement(  AdapterFactory adapterFactory,
                              AdapterNode parent, String propertyName, Object key, Object value ) {
            setContext( adapterFactory, parent, propertyName, null/*we have two values*/ );
            this.key = key;
            this.value = value;
        }

        protected List<Node> buildChildAdapters() {
            List<Node> children = new ArrayList<Node>();
            children.add( getAdapterFactory().adaptNode( this, "key", key ) );
            children.add( getAdapterFactory().adaptNode( this, "value", value ) );
            return children;
        }
    }
}