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Grid BPEL Engine Client developed by Extreme Computing Lab, Indiana University
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/* -*- mode: Java; c-basic-offset: 4; indent-tabs-mode: nil; -*-  //------100-columns-wide------>|*/
/* Copyright (c) 2005 Extreme! Lab, Indiana University. All rights reserved.
 * This software is open source. See the bottom of this file for the license.
 * $Id: GcAtomResource.java,v 1.5 2006/12/07 04:55:28 aslom Exp $ */
package org.gpel.client;

import java.net.URI;
import org.gpel.GpelConstants;
import org.xmlpull.infoset.XmlElement;
import org.xmlpull.infoset.XmlInfosetBuilder;
import org.xmlpull.infoset.XmlNamespace;
import org.xmlpull.infoset.view.TypedXmlElementView;
import org.xmlpull.infoset.view.XmlValidationException;

public abstract class GcAtomResource extends TypedXmlElementView implements GcWebResource {
    private final static XmlInfosetBuilder builder = GpelConstants.BUILDER;
    private URI location;
    private String rel;
    
    public GcAtomResource(String title, String mimeType) {
        //TODO: use ATOMIXMISER?
        super(builder.newFragment(GcUtil.ATOM_NS, GcUtil.ATOM_ENTRY_EL));
        if (title == null) throw new IllegalArgumentException();
        setTitle(title);
        setMimeType(mimeType);
//        XmlElement contentEl = xml().addElement(GcUtil.ATOM_NS, GcUtil.ATOM_CONTENT_EL);
//        contentEl.setAttributeValue("type", GcUtil.XML_MIMETYPE);
//        contentEl.addElement(GpelConstants.GPEL_NS, GcTemplate.TYPE_NAME);
        //loadResourcesFromLinks();
        //super(wrapped);
    }
    
    public GcAtomResource(XmlElement atomRes) {
        super(atomRes);
        if (!atomRes.getNamespace().equals(GcUtil.ATOM_NS)) {
            throw new XmlValidationException("must be in ATOM namespace");
        }
        if (!atomRes.getName().equals(GcUtil.ATOM_ENTRY_EL)) {
            throw new XmlValidationException("must be atom:entry");
        }
        if (getTitle(false) == null) {
            throw new XmlValidationException("required atom:title");
        }
        if (getContentEl(false) == null) {
            throw new XmlValidationException("required atom:content");
        }
    }
    
    public XmlNamespace xmlTypeNs() {
        return xml().getNamespace();
    }
    
    public String xmlTypeName() {
        return xml().getName();
    }
    
    public void xmlSet(XmlElement xmlEl) {
        this.xml = xmlEl;
    }
    
    
    protected XmlElement getContentEl(boolean create) {
        return xml().element(GcUtil.ATOM_NS, GcUtil.ATOM_CONTENT_EL, create);
//        XmlElement topEl = xml();
//        if (topEl.getName().equals(GcUtil.ATOM_ENTRY_EL)) { //&& topEl.getNamespace(GcUtil.ATOM_NS)) {
//            XmlElement contentEl  = topEl.element(GcUtil.ATOM_NS, GcUtil.ATOM_CONTENT_EL);
//            return contentEl;
//        }
//        return null;
    }
        
    public URI getId() throws GcException {
        //if(xml().getName().equals(TYPE_NAME)) {
        XmlElement idEl = xml().element(GpelConstants.ATOM_NS, "id");
        if (idEl == null) {
//            if (getLocation() != null) {
//                URI id = client.mapLocationToId(getLocation());
//                return id;
//            }
            throw new GcException("resource must be first deployed to server have id");
        } else {
            String id = idEl.requiredText();
            return URI.create(id);
        }
    }
    
    public String getMimeType() {
        XmlElement contentEl = getContentEl(true);
        String mimeType  = contentEl.attributeValue(GcUtil.ATOM_CONTENT_TYPE_ATTR);
        return mimeType;
    }
    
    public void setMimeType(String mimeType) {
        if (mimeType == null) throw new IllegalArgumentException();
//        if (!GcWebResourceType.XML.equals(GcUtil.categorizeContentType(mimeType))) {
//            throw new IllegalArgumentException("content type must be xml and not " + mimeType);
//        }
        XmlElement contentEl = getContentEl(true);
        contentEl.setAttributeValue(GcUtil.ATOM_CONTENT_TYPE_ATTR, mimeType);
    }
    
    
    public String getTitle(boolean require) throws GcException {
        XmlElement titleEl;
        if (require) {
            titleEl = xml().requiredElement(GcUtil.ATOM_NS, GcUtil.ATOM_TITLE_EL);
        } else {
            titleEl = xml().element(GcUtil.ATOM_NS, GcUtil.ATOM_TITLE_EL);
            if (titleEl == null) {
                return null;
            }
        }
        String title = titleEl.requiredText();
        return title;
    }
    
    public String getTitle() throws GcException {
        return getTitle(true);
    }
    
    public void setTitle(String title) throws GcException {
        XmlElement titleEl = xml().element(GpelConstants.ATOM_NS, "title", true);
        titleEl.setText(title);
    }

//    public DcDate getUpdated() throws GcException {
//        XmlElement updatedEl = xml().requiredElement(GcUtil.ATOM_NS, GcUtil.ATOM_UPDATED_EL);
//        String updatedText = updatedEl.requiredText();
//        DcDate updated = DcDate.create(updatedText);
//        return updated;
//        //return updated.getTimeInMillis();
//    }
        
    
    public URI getLocation() {
        return location;
    }
    
    public void setLocation(URI location) {
        //this.oldLocation = this.location;
        this.location = location;
    }
    
    public String getRel() {
        return this.rel;
    }
    public void setRel(String rel) {
        this.rel = rel;
    }
}