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jsyntaxpane.util.JarServiceProvider Maven / Gradle / Ivy
/*
* Copyright 2008 Ayman Al-Sairafi [email protected]
*
* 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 jsyntaxpane.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
* @author subwiz
* @author Ayman Al-Sairafi
*/
public class JarServiceProvider {
public static final String SERVICES_ROOT = "META-INF/services/";
private static final Logger LOG = Logger.getLogger(JarServiceProvider.class.getName());
/**
* Prevent anyone from instantiating this class.
* Just use the static method
*/
private JarServiceProvider() {
}
private static ClassLoader getClassLoader() {
ClassLoader cl = JarServiceProvider.class.getClassLoader();
return cl == null ? ClassLoader.getSystemClassLoader() : cl;
}
/**
* Return an Object array from the file in META-INF/resources/{classname}
* @param cls
* @return
* @throws java.io.IOException
*/
public static List getServiceProviders(Class cls) throws IOException {
ArrayList l = new ArrayList();
ClassLoader cl = getClassLoader();
String serviceFile = SERVICES_ROOT + cls.getName();
Enumeration e = cl.getResources(serviceFile);
while (e.hasMoreElements()) {
URL u = e.nextElement();
InputStream is = u.openStream();
BufferedReader br = null;
try {
br = new BufferedReader(
new InputStreamReader(is, Charset.forName("UTF-8")));
String str = null;
while ((str = br.readLine()) != null) {
int commentStartIdx = str.indexOf("#");
if (commentStartIdx != -1) {
str = str.substring(0, commentStartIdx);
}
str = str.trim();
if (str.length() == 0) {
continue;
}
try {
Object obj = cl.loadClass(str).newInstance();
l.add(obj);
} catch (Exception ex) {
LOG.warning("Could not load: " + str);
LOG.warning(ex.getMessage());
}
}
} finally {
if (br != null) {
br.close();
}
}
}
return l;
}
/**
* Read a file in the META-INF/services location. File name will be
* fully qualified classname, in all lower-case, appended with ".properties"
* If no file is found, then a an empty Property instance will be returned
* @param clazz
* @return Property file read.
*/
public static Properties readProperties(Class clazz) {
return readProperties(clazz.getName());
}
/**
* Read a file in the META-INF/services named name appended with
* ".properties"
*
* If no file is found, then a an empty Property instance will be returned
* @param name name of file (use dots to separate subfolders).
* @return Property file read.
*/
public static Properties readProperties(String name) {
Properties props = new Properties();
String serviceFile = name.toLowerCase();
if (!serviceFile.endsWith(".properties")) {
serviceFile += ".properties";
}
InputStream is = findResource(serviceFile);
if (is != null) {
try {
props.load(new InputStreamReader(is, "UTF-8"));
} catch (IOException ex) {
Logger.getLogger(JarServiceProvider.class.getName()).log(Level.SEVERE, null, ex);
}
}
return props;
}
/**
* Read language specific files in the META-INF/services named name appended
* with ".properties". The contents of the files are merged as follows:
*
* First the default language file (<name>.properties) is read
* Then the general language variant of the file
* (<name>_<lang>.properties) is read and its
* entries are added to/overwrite the entries of the default life
* Last the country specific language variant of the file
* (<name>_<lang>_<country>.properties) is read and its
* entries are added to/overwrite the existing entries
*
* Example: You have three files:
*
* config.properties which contains the complete configuration
* (most likely with English menus, tooltips)
* config_de.properties which only contains menu names and tooltips
* in German language
* config_de_CH which might just contain entries for specific
* Swiss spelling variant of some words in a tooltip
*
*
* If no filesis found, then a an empty Property instance will be returned
* @param name name of file (use dots to separate subfolders).
* @param locale The locale for which to read the files
* @return Property file read.
*/
public static Properties readProperties(String name, Locale locale) {
// If name already ends in ".properties", then cut this off
name = name.toLowerCase();
int idx = name.lastIndexOf(".properties");
if (idx > 0) {
name = name.substring(0, idx);
}
// 1. Read properties of default langauge
Properties props = readProperties(name);
// 2. Read properties of general language variant
if (locale != null && locale.getLanguage() != null) {
name += "_"+locale.getLanguage();
Properties langProps = readProperties(name);
props.putAll(langProps);
}
// 3. Read properties of country specific language variant
if (locale != null && locale.getCountry() != null) {
name += "_"+locale.getCountry();
Properties countryProps = readProperties(name);
props.putAll(countryProps);
}
return props;
}
/**
* Read a file in the META-INF/services named name appended with
* ".properties", and returns it as a Map
* If no file is found, then a an empty Property instance will be returned
* @param name name of file (use dots to separate subfolders).
* @return Map of keys and values
*/
public static Map readStringsMap(String name) {
Properties props = readProperties(name);
HashMap map = new HashMap();
if (props != null) {
for (Map.Entry e : props.entrySet()) {
map.put(e.getKey().toString(), e.getValue().toString());
}
}
return map;
}
/**
* Read the given URL and returns a List of Strings for each input line
* Each line will not have the line terminator.
*
* The resource is searched in /META-INF/services/url, then in
* url, then the url is treated as a location in the current classpath
* and an attempt to read it from that location is done.
*
* @param url location of file to read
* @return List of Strings for each line read. or EMPTY_LIST if URL is not found
*/
@SuppressWarnings("unchecked")
public static List readLines(String url) {
InputStream is = findResource(url);
if (is == null) {
return Collections.EMPTY_LIST;
}
List lines = new ArrayList();
try {
BufferedReader br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
for (String line = br.readLine(); line != null; line = br.readLine()) {
// Trim and unescape some control chars
line = line.trim().replace("\\n", "\n").replace("\\t", "\t");
lines.add(line);
}
} catch (IOException ex) {
LOG.log(Level.SEVERE, null, ex);
} finally {
try {
is.close();
} catch (IOException ex) {
LOG.log(Level.SEVERE, null, ex);
}
return lines;
}
}
/**
* Attempt to find a location url. The following locations are searched in
* sequence:
* url,
* SERVICES_ROOT/url
* all classpath/url
* @param url
* @param cl classloader
* @return InputSTream at that location, or null if not found
* @see JarServiceProvider#findResource(java.lang.String)
*/
public static InputStream findResource(String url, ClassLoader cl) {
InputStream is = null;
URL loc = cl.getResource(url);
if (loc == null) {
loc = cl.getResource(url);
}
if (loc == null) {
loc = cl.getResource(SERVICES_ROOT + url);
}
if (loc == null) {
is = ClassLoader.getSystemResourceAsStream(url);
} else {
try {
is = loc.openStream();
} catch (IOException ex) {
Logger.getLogger(JarServiceProvider.class.getName()).log(Level.SEVERE, null, ex);
}
}
return is;
}
/**
* Attempt to find a location url. The following locations are searched in
* sequence:
* url,
* SERVICES_ROOT/url
* all classpath/url
* The System ClassLoader is used.
* @param url
* @return InputSTream at that location, or null if not found
* @see JarServiceProvider#findResource(java.lang.String, java.lang.ClassLoader)
*/
public static InputStream findResource(String url) {
return findResource(url, getClassLoader());
}
}
