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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.tuscany.sca.contribution.service.impl;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Map;
import org.apache.tuscany.sca.contribution.ContentType;
import org.apache.tuscany.sca.contribution.service.TypeDescriber;
import org.apache.tuscany.sca.contribution.service.util.FileHelper;
/**
* Implementation of the content describer for contribution packages
*
* @version $Rev$ $Date$
*/
public class PackageTypeDescriberImpl implements TypeDescriber {
private final Map<String, String> contentTypeRegistry = new HashMap<String, String>();
public PackageTypeDescriberImpl() {
super();
init();
}
/**
* Initialize contentType registry with know types based on known file extensions
*/
private void init() {
contentTypeRegistry.put("JAR", ContentType.JAR);
}
protected String resolveContentyTypeByExtension(URL resourceURL) {
String artifactExtension = FileHelper.getExtension(resourceURL.getPath());
if (artifactExtension == null) {
return null;
}
return contentTypeRegistry.get(artifactExtension.toUpperCase());
}
/**
* Build contentType for a specific resource. We first check if the file is
* a supported one (looking into our registry based on resource extension)
* If not found, we try to check file contentType Or we return
* defaultContentType provided
*
* @param resourceURL The artifact url
* @param defaultContentType The default content type if we can't find the correc one
* @return The content type
*/
public String getType(URL resourceURL, String defaultContentType) {
URLConnection connection = null;
String contentType = defaultContentType;
if (resourceURL.getProtocol().equals("file") && FileHelper.toFile(resourceURL).isDirectory()) {
// Special case : contribution is a folder
contentType = ContentType.FOLDER;
} else {
contentType = resolveContentyTypeByExtension(resourceURL);
if (contentType == null) {
try {
connection = resourceURL.openConnection();
contentType = connection.getContentType();
if (contentType == null || contentType.equals("content/unknown")) {
// here we couldn't figure out from our registry or from URL and it's not a special file
// return defaultContentType if provided
contentType = defaultContentType;
}
} catch (IOException io) {
// could not access artifact, just ignore and we will return
// null contentType
}
}
}
return contentType == null ? defaultContentType : contentType;
}
}
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