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Diffstat (limited to 'libjava/classpath/gnu/java/net/IndexListParser.java')
| -rw-r--r-- | libjava/classpath/gnu/java/net/IndexListParser.java | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/net/IndexListParser.java b/libjava/classpath/gnu/java/net/IndexListParser.java new file mode 100644 index 000000000..bf274b172 --- /dev/null +++ b/libjava/classpath/gnu/java/net/IndexListParser.java @@ -0,0 +1,183 @@ +/* IndexListParser.java -- + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.net; + +import java.io.BufferedReader; +import java.io.InputStreamReader; +import java.net.URL; +import java.util.HashSet; +import java.util.LinkedHashMap; +import java.util.Set; +import java.util.jar.JarFile; + +/** + * The INDEX.LIST file contains sections each separated by a blank line. + * Each section defines the content of a jar, with a + * header defining the jar file path name, followed by a list of paths. + * The jar file paths are relative to the codebase of the root jar. + * + Specification + index file : version-info blankline section* + version-info : JarIndex-Version: version-number + version-number : digit+{.digit+}* + section : body blankline + body : header name* + header : char+.jar newline + name : char+ newline + + * @author langel at redhat dot com + */ +public class IndexListParser +{ + public static final String JAR_INDEX_FILE = "META-INF/INDEX.LIST"; + public static final String JAR_INDEX_VERSION_KEY = "JarIndex-Version: "; + + double versionNumber; + // Map each jar to the prefixes defined for the jar. + // This is intentionally kept in insertion order. + LinkedHashMap<URL, Set<String>> prefixes + = new LinkedHashMap<URL, Set<String>>(); + + /** + * Parses the given jarfile's INDEX.LIST file if it exists. + * + * @param jarfile - the given jar file + * @param baseJarURL - the codebase of the jar file + * @param baseURL - the base url for the headers + */ + public IndexListParser(JarFile jarfile, URL baseJarURL, URL baseURL) + { + try + { + // Parse INDEX.LIST if it exists + if (jarfile.getEntry(JAR_INDEX_FILE) != null) + { + BufferedReader br = new BufferedReader(new InputStreamReader(new URL(baseJarURL, + JAR_INDEX_FILE).openStream())); + + // Must start with version info + String line = br.readLine(); + if (!line.startsWith(JAR_INDEX_VERSION_KEY)) + return; + versionNumber = Double.parseDouble(line.substring(JAR_INDEX_VERSION_KEY.length()).trim()); + + // Blank line must be next + line = br.readLine(); + if (! "".equals(line)) + { + clearAll(); + return; + } + + // May contain sections. + while ((line = br.readLine()) != null) + { + URL jarURL = new URL(baseURL, line); + HashSet<String> values = new HashSet<String>(); + + // Read the names in the section. + while ((line = br.readLine()) != null) + { + // Stop at section boundary. + if ("".equals(line)) + break; + values.add(line.trim()); + } + prefixes.put(jarURL, values); + // Might have seen an early EOF. + if (line == null) + break; + } + + br.close(); + } + else + { + // INDEX.LIST does not exist + clearAll(); + } + } + catch (Exception ex) + { + clearAll(); + } + } + + /** + * Clears all the variables. This is called when parsing fails. + */ + void clearAll() + { + versionNumber = 0; + prefixes = null; + } + + /** + * Gets the version info for the file. + * + * @return the version info. + */ + public String getVersionInfo() + { + return JAR_INDEX_VERSION_KEY + getVersionNumber(); + } + + /** + * Gets the version number of the file. + * + * @return the version number. + */ + public double getVersionNumber() + { + return versionNumber; + } + + /** + * Gets the map of all the headers found in the file. + * The keys in the map are URLs of jars. The values in the map + * are Sets of package prefixes (and top-level file names), as + * specifed in INDEX.LIST. + * + * @return an map of all the headers, or null if no INDEX.LIST was found + */ + public LinkedHashMap<URL, Set<String>> getHeaders() + { + return prefixes; + } +} |