/*
 * Copyright (c) 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Nuxeo - initial API and implementation
 *
 * $Id$
 */

package org.eclipse.ecr.runtime.model.impl;

import java.io.Serializable;

import org.eclipse.ecr.runtime.model.Extension;
import org.eclipse.ecr.runtime.model.ExtensionPoint;
import org.eclipse.ecr.runtime.model.RegistrationInfo;
import org.nuxeo.common.xmap.XMap;
import org.nuxeo.common.xmap.annotation.XContent;
import org.nuxeo.common.xmap.annotation.XNode;
import org.nuxeo.common.xmap.annotation.XNodeList;
import org.nuxeo.common.xmap.annotation.XObject;
import org.nuxeo.common.xmap.annotation.XParent;
import org.w3c.dom.Element;

/**
 * @author  <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
 *
 */
@XObject
public class ExtensionPointImpl implements ExtensionPoint, Serializable {

    private static final long serialVersionUID = 3959978759388449332L;

    @XNode("@name")
    public String name;

    @XNode("@target")
    public String superComponent;

    @XContent("documentation")
    public String documentation;

    @XNodeList(value = "object@class", type = Class[].class, componentType = Class.class)
    public transient Class[] contributions;

    public transient XMap xmap;

    @XParent
    public transient RegistrationInfo ri;


    @Override
    public Class[] getContributions() {
        return contributions;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public String getDocumentation() {
        return documentation;
    }

    @Override
    public String getSuperComponent() {
        return superComponent;
    }

    public Extension createExtension(Element element) {
        return null;
    }

    public Object[] loadContributions(RegistrationInfo owner, Extension extension) throws Exception {
        Object[] contribs = extension.getContributions();
        if (contribs != null) {
            // contributions already computed - this should e an overloaded (extended) extension point
            return contribs;
        }
        // should compute now the contributions
        if (contributions != null) {
            if (xmap == null) {
                xmap = new XMap();
                for (Class contrib : contributions) {
                    xmap.register(contrib);
                }
            }
            contribs = xmap.loadAll(
                    new XMapContext(extension.getContext()),
                    extension.getElement());
            extension.setContributions(contribs);
        }
        return contribs;
    }

}