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/*
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* Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package com.sun.tools.javac.processing;
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import java.io.BufferedReader;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.net.MalformedURLException;
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import java.net.URL;
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/**
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* Utility class to determine if a service can be found on the
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* path that might be used to create a class loader.
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*
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* <p><b>This is NOT part of any API supported by Sun Microsystems.
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* If you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b>
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*
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*/
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// based on sun.misc.Service
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class ServiceProxy {
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static class ServiceConfigurationError extends Error {
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static final long serialVersionUID = 7732091036771098303L;
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ServiceConfigurationError(String msg) {
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super(msg);
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}
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}
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private static final String prefix = "META-INF/services/";
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private static void fail(Class service, String msg)
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throws ServiceConfigurationError {
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throw new ServiceConfigurationError(service.getName() + ": " + msg);
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}
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private static void fail(Class service, URL u, int line, String msg)
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throws ServiceConfigurationError {
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fail(service, u + ":" + line + ": " + msg);
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}
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/**
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* Parse the content of the given URL as a provider-configuration file.
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*
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* @param service
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* The service class for which providers are being sought;
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* used to construct error detail strings
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*
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* @param url
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* The URL naming the configuration file to be parsed
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*
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* @return true if the name of a service is found
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*
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* @throws ServiceConfigurationError
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* If an I/O error occurs while reading from the given URL, or
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* if a configuration-file format error is detected
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*/
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private static boolean parse(Class service, URL u) throws ServiceConfigurationError {
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InputStream in = null;
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BufferedReader r = null;
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try {
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in = u.openStream();
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r = new BufferedReader(new InputStreamReader(in, "utf-8"));
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int lc = 1;
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String ln;
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while ((ln = r.readLine()) != null) {
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int ci = ln.indexOf('#');
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if (ci >= 0) ln = ln.substring(0, ci);
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ln = ln.trim();
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int n = ln.length();
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if (n != 0) {
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if ((ln.indexOf(' ') >= 0) || (ln.indexOf('\t') >= 0))
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fail(service, u, lc, "Illegal configuration-file syntax");
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int cp = ln.codePointAt(0);
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if (!Character.isJavaIdentifierStart(cp))
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fail(service, u, lc, "Illegal provider-class name: " + ln);
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for (int i = Character.charCount(cp); i < n; i += Character.charCount(cp)) {
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cp = ln.codePointAt(i);
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if (!Character.isJavaIdentifierPart(cp) && (cp != '.'))
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fail(service, u, lc, "Illegal provider-class name: " + ln);
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}
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return true;
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}
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}
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} catch (FileNotFoundException x) {
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return false;
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} catch (IOException x) {
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fail(service, ": " + x);
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} finally {
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try {
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if (r != null) r.close();
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} catch (IOException y) {
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fail(service, ": " + y);
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}
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try {
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if (in != null) in.close();
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} catch (IOException y) {
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fail(service, ": " + y);
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}
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}
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return false;
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}
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/**
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* Return true if a description for at least one service is found in the
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* service configuration files in the given URLs.
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*/
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public static boolean hasService(Class<?> service, URL[] urls)
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throws ServiceConfigurationError {
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for (URL url: urls) {
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try {
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String fullName = prefix + service.getName();
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URL u = new URL(url, fullName);
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boolean found = parse(service, u);
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if (found)
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return true;
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} catch (MalformedURLException e) {
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// should not happen; ignore it if it does
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}
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}
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return false;
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}
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}
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