diff options
Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/net/loader/JarURLLoader.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/net/loader/JarURLLoader.java | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/net/loader/JarURLLoader.java b/gcc-4.4.3/libjava/classpath/gnu/java/net/loader/JarURLLoader.java new file mode 100644 index 000000000..40194be79 --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/net/loader/JarURLLoader.java @@ -0,0 +1,215 @@ +package gnu.java.net.loader; + +import gnu.java.net.IndexListParser; + +import java.io.IOException; +import java.net.JarURLConnection; +import java.net.MalformedURLException; +import java.net.URL; +import java.net.URLClassLoader; +import java.net.URLStreamHandlerFactory; +import java.util.ArrayList; +import java.util.Iterator; +import java.util.LinkedHashMap; +import java.util.Map; +import java.util.Set; +import java.util.StringTokenizer; +import java.util.jar.Attributes; +import java.util.jar.JarEntry; +import java.util.jar.JarFile; +import java.util.jar.Manifest; + +/** + * A <code>JarURLLoader</code> is a type of <code>URLLoader</code> + * only loading from jar url. + */ +public final class JarURLLoader extends URLLoader +{ + // True if we've initialized -- i.e., tried open the jar file. + boolean initialized; + // The jar file for this url. + JarFile jarfile; + // Base jar: url for all resources loaded from jar. + final URL baseJarURL; + // The "Class-Path" attribute of this Jar's manifest. + ArrayList<URLLoader> classPath; + // If not null, a mapping from INDEX.LIST for this jar only. + // This is a set of all prefixes and top-level files that + // ought to be available in this jar. + Set indexSet; + + // This constructor is used internally. It purposely does not open + // the jar file -- it defers this until later. This allows us to + // implement INDEX.LIST lazy-loading semantics. + private JarURLLoader(URLClassLoader classloader, URLStreamHandlerCache cache, + URLStreamHandlerFactory factory, + URL baseURL, URL absoluteUrl, + Set indexSet) + { + super(classloader, cache, factory, baseURL, absoluteUrl); + + URL newBaseURL = null; + try + { + // Cache url prefix for all resources in this jar url. + String base = baseURL.toExternalForm() + "!/"; + newBaseURL = new URL("jar", "", -1, base, cache.get(factory, "jar")); + } + catch (MalformedURLException ignore) + { + // Ignore. + } + this.baseJarURL = newBaseURL; + this.classPath = null; + this.indexSet = indexSet; + } + + // This constructor is used by URLClassLoader. It will immediately + // try to read the jar file, in case we've found an index or a class-path + // setting. FIXME: it would be nice to defer this as well, but URLClassLoader + // makes this hard. + public JarURLLoader(URLClassLoader classloader, URLStreamHandlerCache cache, + URLStreamHandlerFactory factory, + URL baseURL, URL absoluteUrl) + { + this(classloader, cache, factory, baseURL, absoluteUrl, null); + initialize(); + } + + private void initialize() + { + JarFile jarfile = null; + try + { + jarfile = + ((JarURLConnection) baseJarURL.openConnection()).getJarFile(); + + Manifest manifest; + Attributes attributes; + String classPathString; + + IndexListParser parser = new IndexListParser(jarfile, baseJarURL, + baseURL); + LinkedHashMap<URL, Set<String>> indexMap = parser.getHeaders(); + if (indexMap != null) + { + // Note that the index also computes + // the resulting Class-Path -- there are jars out there + // where the index lists some required jars which do + // not appear in the Class-Path attribute in the manifest. + this.classPath = new ArrayList<URLLoader>(); + Iterator<Map.Entry<URL, Set<String>>> it = indexMap.entrySet().iterator(); + while (it.hasNext()) + { + Map.Entry<URL, Set<String>> entry = it.next(); + URL subURL = entry.getKey(); + Set<String> prefixes = entry.getValue(); + if (subURL.equals(baseURL)) + this.indexSet = prefixes; + else + { + JarURLLoader subLoader = new JarURLLoader(classloader, + cache, + factory, subURL, + subURL, + prefixes); + // Note that we don't care if the sub-loader itself has an + // index or a class-path -- only the top-level jar + // file gets this treatment; its index should cover + // everything. + this.classPath.add(subLoader); + } + } + } + else if ((manifest = jarfile.getManifest()) != null + && (attributes = manifest.getMainAttributes()) != null + && ((classPathString + = attributes.getValue(Attributes.Name.CLASS_PATH)) + != null)) + { + this.classPath = new ArrayList<URLLoader>(); + StringTokenizer st = new StringTokenizer(classPathString, " "); + while (st.hasMoreElements ()) + { + String e = st.nextToken (); + try + { + URL subURL = new URL(baseURL, e); + // We've seen at least one jar file whose Class-Path + // attribute includes the original jar. If we process + // that normally we end up with infinite recursion. + if (subURL.equals(baseURL)) + continue; + JarURLLoader subLoader = new JarURLLoader(classloader, + cache, factory, + subURL, subURL); + this.classPath.add(subLoader); + ArrayList<URLLoader> extra = subLoader.getClassPath(); + if (extra != null) + this.classPath.addAll(extra); + } + catch (java.net.MalformedURLException xx) + { + // Give up + } + } + } + } + catch (IOException ioe) + { + /* ignored */ + } + + this.jarfile = jarfile; + this.initialized = true; + } + + /** get resource with the name "name" in the jar url */ + public Resource getResource(String name) + { + if (name.startsWith("/")) + name = name.substring(1); + if (indexSet != null) + { + // Trust the index. + String basename = name; + int offset = basename.lastIndexOf('/'); + if (offset != -1) + basename = basename.substring(0, offset); + if (! indexSet.contains(basename)) + return null; + // FIXME: if the index claim to hold the resource, and jar file + // doesn't have it, we're supposed to throw an exception. However, + // in our model this is tricky to implement, as another URLLoader from + // the same top-level jar may have an overlapping index entry. + } + + if (! initialized) + initialize(); + if (jarfile == null) + return null; + + JarEntry je = jarfile.getJarEntry(name); + if (je != null) + return new JarURLResource(this, name, je); + else + return null; + } + + public Manifest getManifest() + { + try + { + return (jarfile == null) ? null : jarfile.getManifest(); + } + catch (IOException ioe) + { + return null; + } + } + + public ArrayList<URLLoader> getClassPath() + { + return classPath; + } +} |