DOMWrapperHandler.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.tuscany.sca.databinding.xml;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.xml.namespace.QName;

import org.apache.tuscany.sca.common.xml.dom.DOMHelper;
import org.apache.tuscany.sca.databinding.WrapperHandler;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.interfacedef.impl.DataTypeImpl;
import org.apache.tuscany.sca.interfacedef.util.ElementInfo;
import org.apache.tuscany.sca.interfacedef.util.WrapperInfo;
import org.apache.tuscany.sca.interfacedef.util.XMLType;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class DOMWrapperHandler implements WrapperHandler<Node> {
    private DOMHelper domHelper;
    
    public DOMWrapperHandler(DOMHelper domHelper) {
        super();
        this.domHelper = domHelper;
    }

    public Node create(Operation operation, boolean input) {

        WrapperInfo wrapperInfo = operation.getWrapper();
        ElementInfo element = input ? wrapperInfo.getInputWrapperElement() : wrapperInfo.getOutputWrapperElement();
        // Class<?> wrapperClass = input ? wrapperInfo.getInputWrapperClass() : wrapperInfo.getOutputWrapperClass();
        Document document = domHelper.newDocument();
        QName name = element.getQName();
        return DOMHelper.createElement(document, name);
    }

    public void setChildren(Node wrapper,
                            Object[] childObjects,
                            Operation operation, boolean input) {
        List<ElementInfo> childElements = input? operation.getWrapper().getInputChildElements():
            operation.getWrapper().getOutputChildElements();
        for (int i = 0; i < childElements.size(); i++) {
            setChild(wrapper, i, childElements.get(i), childObjects[i]);
        }

    }
    public void setChild(Node wrapper, int i, ElementInfo childElement, Object value) {
        Node node = (Node)value;
        if (node.getNodeType() == Node.DOCUMENT_NODE) {
            node = ((Document)node).getDocumentElement();
        }
        wrapper.appendChild(wrapper.getOwnerDocument().importNode(node, true));
    }

    public List getChildren(Node wrapper, Operation operation, boolean input) {
        assert wrapper != null;
        List<ElementInfo> childElements = input? operation.getWrapper().getInputChildElements():
            operation.getWrapper().getOutputChildElements();
        if (wrapper.getNodeType() == Node.DOCUMENT_NODE) {
            wrapper = ((Document)wrapper).getDocumentElement();
        }
        List<Node> elements = new ArrayList<Node>();
        NodeList nodes = wrapper.getChildNodes();
        for (int j = 0; j < nodes.getLength(); j++) {
            Node node = nodes.item(j);
            if (node.getNodeType() == Node.ELEMENT_NODE) {
                elements.add(node);
            }
        }
        return elements;
    }

    /**
     * @see org.apache.tuscany.sca.databinding.WrapperHandler#getWrapperType(Operation, boolean)
     */
    public DataType getWrapperType(Operation operation, boolean input) {
        WrapperInfo wrapper = operation.getWrapper();
        ElementInfo element = input? wrapper.getInputWrapperElement(): wrapper.getOutputWrapperElement();
        DataType<XMLType> wrapperType =
            new DataTypeImpl<XMLType>(DOMDataBinding.NAME, Node.class, new XMLType(element));
        return wrapperType;
    }

    public boolean isInstance(Object wrapperObj,
                              Operation operation,
                              boolean input) {
        WrapperInfo wrapperInfo = operation.getWrapper();
        ElementInfo element = input ? wrapperInfo.getInputWrapperElement() : wrapperInfo.getOutputWrapperElement();
        List<ElementInfo> childElements =
            input ? wrapperInfo.getInputChildElements() : wrapperInfo.getOutputChildElements();
        Node wrapper = (Node)wrapperObj;
        if (wrapper.getNodeType() == Node.DOCUMENT_NODE) {
            wrapper = ((Document)wrapper).getDocumentElement();
        }
        QName elementName = new QName(wrapper.getNamespaceURI(), wrapper.getLocalName());
        if (!element.getQName().equals(elementName)) {
            return false;
        }
        Set<QName> names = new HashSet<QName>();
        for (ElementInfo e : childElements) {
            names.add(e.getQName());
        }
        NodeList nodes = wrapper.getChildNodes();
        for (int j = 0; j < nodes.getLength(); j++) {
            Node node = nodes.item(j);
            if (node.getNodeType() == Node.ELEMENT_NODE) {
                elementName = new QName(wrapper.getNamespaceURI(), wrapper.getLocalName());
                if (!names.contains(elementName)) {
                    return false;
                }
            }
        }
        return true;
    }

}