/*
 * Copyright (C) 2007-2012 Argeo GmbH
 *
 * Licensed 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.argeo.eclipse.ui.specific;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.rap.rwt.RWT;
import org.eclipse.rap.rwt.client.service.UrlLauncher;

/**
 * RWT specific object to open a file retrieved from the server. It forwards the
 * request to the correct service after encoding file name and path in the
 * request URI.
 * 
 * <p>
 * The parameter "URI" is used to determine the correct file service, the path
 * and the file name. An optional file name can be added to present the end user
 * with a different file name as the one used to retrieve it.
 * </p>
 * 
 * 
 * <p>
 * The instance specific service is called by its ID and must have been
 * externally created
 * </p>
 */
public class OpenFile {
	private final static Log log = LogFactory.getLog(OpenFile.class);

	// /* DEPENDENCY INJECTION */
	// private String openFileServiceId;
	//
	// public final static String PARAM_FILE_NAME =
	// OpenFileService.PARAM_FILE_NAME;
	// public final static String PARAM_FILE_URI =
	// OpenFileService.PARAM_FILE_URI; // "param.fileURI";

	public Object execute(String openFileServiceId, String fileUri,
			String fileName) {
		// // Sanity check
		// if (fileUri == null || "".equals(fileUri.trim())
		// || openFileServiceId == null
		// || "".equals(openFileServiceId.trim()))
		// return null;

		StringBuilder url = new StringBuilder();
		url.append(RWT.getServiceManager().getServiceHandlerUrl(
				openFileServiceId));

		url.append("&").append(OpenFileService.PARAM_FILE_NAME).append("=");
		url.append(fileName);
		url.append("&").append(OpenFileService.PARAM_FILE_URI).append("=");
		url.append(fileUri);

		String downloadUrl = url.toString();
		if (log.isTraceEnabled())
			log.debug("URL : " + downloadUrl);

		UrlLauncher launcher = RWT.getClient().getService(UrlLauncher.class);
		launcher.openURL(downloadUrl);
		return null;
	}

	// /* DEPENDENCY INJECTION */
	// public void setOpenFileServiceId(String openFileServiceId) {
	// this.openFileServiceId = openFileServiceId;
	// }
}