org.apache.cocoon.util.MIMEUtils Maven / Gradle / Ivy
/*
* 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.cocoon.util;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;
/**
* A collection of File, URL and filename
* utility methods.
*
* @version $Id: MIMEUtils.java 587751 2007-10-24 02:41:36Z vgritsenko $
*/
public class MIMEUtils {
private static final String MIME_MAPPING_FILE = "org/apache/cocoon/util/mime.types";
/** Default extensions for MIME types. */
final private static Map extMap = new HashMap();
/** MIME types for extensions. */
final private static Map mimeMap = new HashMap();
/**
* Load the MIME type mapping
*/
static {
try {
final InputStream is = MIMEUtils.class.getClassLoader().getResourceAsStream(MIME_MAPPING_FILE);
if (null == is) {
throw new RuntimeException("Cocoon cannot load MIME type mappings from " + MIME_MAPPING_FILE);
}
loadMimeTypes(new InputStreamReader(is), extMap, mimeMap);
} catch (IOException ioe) {
throw new RuntimeException("Cocoon cannot load MIME type mappings from " + MIME_MAPPING_FILE);
}
}
/**
* Return the MIME type for a given file.
*
* @param file File.
* @return MIME type.
*/
public static String getMIMEType(final File file)
throws FileNotFoundException, IOException {
BufferedInputStream in = null;
try {
in = new BufferedInputStream(new FileInputStream(file));
byte[] buf = new byte[3];
int count = in.read(buf, 0, 3);
if (count < 3) {
return (null);
}
if ((buf[0]) == (byte)'G' && (buf[1]) == (byte)'I' && (buf[2]) == (byte)'F') {
return ("image/gif");
}
if ((buf[0]) == (byte)0xFF && (buf[1]) == (byte)0xD8) {
return ("image/jpeg");
}
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
}
}
}
final String name = file.getName();
int index = name.lastIndexOf(".");
String fileExt = ".";
if (index != -1) {
fileExt = name.substring(index);
}
return getMIMEType(fileExt);
}
/**
* Return the MIME type for a given filename extension.
*
* @param ext Filename extension.
*
* @return MIME type.
*/
public static String getMIMEType(final String ext) {
return (String)mimeMap.get(ext);
}
/**
* Return the default filename extension for a given MIME type.
*
* @param type MIME type.
*
* @return Filename extension.
*/
public static String getDefaultExtension(final String type) {
return (String)extMap.get(type);
}
/**
* Parses a mime.types file, and generates mappings between
* MIME types and extensions.
* For example, if a line contains:
* text/html html htm
* Then 'html' will be the default extension for text/html, and both 'html'
* and 'htm' will have MIME type 'text/html'.
* Lines starting with '#' are treated as comments and ignored. If an
* extension is listed for two MIME types, the first will be chosen.
*
* @param in Reader of bytes from mime.types file content
* @param extMap Empty map of default extensions, keyed by MIME type. Will
* be filled in by this method.
* @param mimeMap Empty map of MIME types, keyed by extension. Will be
* filled in by this method.
*/
public static void loadMimeTypes(Reader in, Map extMap, Map mimeMap) throws IOException {
BufferedReader br = new BufferedReader(in);
String line;
while ((line = br.readLine()) != null) {
if (line.startsWith("#")) {
continue;
}
if (line.trim().length() == 0) {
continue;
}
StringTokenizer tok = new StringTokenizer(line, " \t");
String mimeType = tok.nextToken();
if (tok.hasMoreTokens()) {
String defaultExt = tok.nextToken();
if (!extMap.containsKey(mimeType)) {
extMap.put(mimeType, "." + defaultExt);
}
if (!mimeMap.containsKey("." + defaultExt)) {
mimeMap.put("." + defaultExt, mimeType);
}
while (tok.hasMoreTokens()) {
String ext = tok.nextToken();
if (!mimeMap.containsKey("." + ext)) {
mimeMap.put("." + ext, mimeType);
}
}
}
}
}
}