/*
 * 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.axis2.scripting.convertors;

import javax.xml.stream.XMLStreamException;

import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.impl.builder.StAXOMBuilder;
import org.apache.xmlbeans.XmlObject;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.Wrapper;
import org.mozilla.javascript.xml.XMLObject;

/**
 * JSObjectConvertor converts between OMElements and JavaScript E4X XML objects
 */
public class JSOMElementConvertor extends DefaultOMElementConvertor {

    protected Scriptable scope;

    public JSOMElementConvertor() {
        Context cx = Context.enter();
        try {
            this.scope = cx.initStandardObjects();
        } finally {
            Context.exit();
        }
    }

    public Object toScript(OMElement o) {
        XmlObject xml;
        try {
            xml = XmlObject.Factory.parse(o.getXMLStreamReader());
        } catch (Exception e) {
            throw new RuntimeException("exception getting message XML: " + e);
        }

        Context cx = Context.enter();
        try {

            Object wrappedXML = cx.getWrapFactory().wrap(cx, scope, xml, XmlObject.class);
            Scriptable jsXML = cx.newObject(scope, "XML", new Object[] { wrappedXML });

            return jsXML;

        } finally {
            Context.exit();
        }
    }

    public OMElement fromScript(Object o) {
        if (!(o instanceof XMLObject)) {
            return super.fromScript(o);
        }

        // TODO: E4X Bug? Shouldn't need this copy, but without it the outer element gets lost. See Mozilla bugzilla 361722
        Scriptable jsXML = (Scriptable) ScriptableObject.callMethod((Scriptable) o, "copy", new Object[0]);
        Wrapper wrapper = (Wrapper) ScriptableObject.callMethod((XMLObject)jsXML, "getXmlObject", new Object[0]);
        XmlObject xmlObject = (XmlObject)wrapper.unwrap();
        try {

            StAXOMBuilder builder = new StAXOMBuilder(xmlObject.newInputStream());
            OMElement omElement = builder.getDocumentElement();

            return omElement;

        } catch (XMLStreamException e) {
            throw new RuntimeException(e);
        }
    }

}