/*
 * 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:
 *     bstefanescu
 *
 * $Id$
 */

package org.eclipse.ecr.web.rendering.fm.adapters;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.ecr.core.api.Blob;

import freemarker.template.AdapterTemplateModel;
import freemarker.template.SimpleNumber;
import freemarker.template.SimpleScalar;
import freemarker.template.TemplateCollectionModel;
import freemarker.template.TemplateHashModelEx;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;

/**
 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
 *
 */
public class BlobTemplate extends PropertyWrapper implements
        TemplateHashModelEx, AdapterTemplateModel {

    protected static final String[] keys = { "filename", "data", "length",
            "mimeType", "encoding", "digest" };

    protected final Blob blob;

    public BlobTemplate(DocumentObjectWrapper wrapper, Blob blob) {
        super(wrapper);
        this.blob = blob;
    }

    @SuppressWarnings("unchecked")
    public Object getAdaptedObject(Class hint) {
        return blob;
    }

    public TemplateCollectionModel keys() throws TemplateModelException {
        return (TemplateCollectionModel) wrapper.wrap(keys);
    }

    public int size() throws TemplateModelException {
        return keys.length;
    }

    public TemplateCollectionModel values() throws TemplateModelException {
        try {
            List<Object> list = new ArrayList<Object>(keys.length);
            if (blob != null) {
                list.add(blob.getFilename());
                list.add(blob.getString());
                list.add(blob.getLength());
                list.add(blob.getMimeType());
                list.add(blob.getEncoding());
                list.add(blob.getDigest());
            } else {
                list.add("");
                list.add("");
                list.add("");
                list.add("");
                list.add("");
                list.add("");
            }
            return (TemplateCollectionModel) wrapper.wrap(list);
        } catch (Exception e) {
            throw new TemplateModelException(
                    "Failed to adapt complex property values", e);
        }
    }

    public TemplateModel get(String name) throws TemplateModelException {
        try {
            if (blob != null) {
                if (keys[0].equals(name)) {
                    return new SimpleScalar(blob.getFilename());
                } else if (keys[1].equals(name)) {
                    return new SimpleScalar(blob.getString());
                } else if (keys[2].equals(name)) {
                    return new SimpleNumber(blob.getLength());
                } else if (keys[3].equals(name)) {
                    return new SimpleScalar(blob.getMimeType());
                } else if (keys[4].equals(name)) {
                    return new SimpleScalar(blob.getEncoding());
                } else if (keys[5].equals(name)) {
                    return new SimpleScalar(blob.getDigest());
                }
            }
            return NOTHING;
        } catch (IOException e) {
            throw new TemplateModelException(e);
        }
    }

    public boolean isEmpty() throws TemplateModelException {
        return false;
    }

}