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/*
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the License).  You may not use this file except in
 * compliance with the License.
 * 
 * You can obtain a copy of the license at
 * https://glassfish.dev.java.net/public/CDDLv1.0.html.
 * See the License for the specific language governing
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL
 * Header Notice in each file and include the License file
 * at https://glassfish.dev.java.net/public/CDDLv1.0.html.
 * If applicable, add the following below the CDDL Header,
 * with the fields enclosed by brackets [] replaced by
 * you own identifying information:
 * "Portions Copyrighted [year] [name of copyright owner]"
 * 
 * Copyright 2006 Sun Microsystems Inc. All Rights Reserved
 */

package com.sun.xml.ws.message;

import com.sun.istack.NotNull;
import com.sun.xml.ws.api.SOAPVersion;
import com.sun.xml.ws.api.message.AttachmentSet;
import com.sun.xml.ws.api.message.Header;
import com.sun.xml.ws.api.message.HeaderList;
import com.sun.xml.ws.api.message.Message;
import org.xml.sax.ContentHandler;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;

import javax.xml.soap.SOAPException;
import javax.xml.soap.SOAPMessage;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.transform.Source;

/**
 * {@link Message} that has no body.
 * 
 * @author Kohsuke Kawaguchi
 */
public class EmptyMessageImpl extends AbstractMessageImpl {

    /**
     * If a message has no payload, it's more likely to have
     * some header, so we create it eagerly here.
     */
    private final HeaderList headers;
    private final AttachmentSet attachmentSet;

    public EmptyMessageImpl(SOAPVersion version) {
        super(version);
        this.headers = new HeaderList();
        this.attachmentSet = new AttachmentSetImpl();
    }

    public EmptyMessageImpl(HeaderList headers, @NotNull AttachmentSet attachmentSet, SOAPVersion version){
        super(version);
        if(headers==null)
            headers = new HeaderList();
        this.attachmentSet = attachmentSet;
        this.headers = headers;
    }

    /**
     * Copy constructor.
     */
    private EmptyMessageImpl(EmptyMessageImpl that) {
        super(that);
        this.headers = new HeaderList(that.headers);
        this.attachmentSet = that.attachmentSet;
    }

    public boolean hasHeaders() {
        return !headers.isEmpty();
    }
    
    @Override
    public @NotNull AttachmentSet getAttachments() {
        return attachmentSet;
    }

    public HeaderList getHeaders() {
        return headers;
    }

    public String getPayloadLocalPart() {
        return null;
    }

    public String getPayloadNamespaceURI() {
        return null;
    }

    public boolean hasPayload() {
        return false;
    }

    public Source readPayloadAsSource() {
        return null;
    }

    public XMLStreamReader readPayload() throws XMLStreamException {
        return null;
    }

    public void writePayloadTo(XMLStreamWriter sw) throws XMLStreamException {
        // noop
    }

    public void writePayloadTo(ContentHandler contentHandler, ErrorHandler errorHandler, boolean fragment) throws SAXException {
        // noop
    }

    public Message copy() {
        return new EmptyMessageImpl(this);
    }
}