Add dexgen helper classes and Android.mk

[android-x86/dalvik.git] / dexgen / src / com / android / dexgen / util / DexJarMaker.java

diff --git a/dexgen/src/com/android/dexgen/util/DexJarMaker.java b/dexgen/src/com/android/dexgen/util/DexJarMaker.java
new file mode 100644 (file)
index 0000000..4fe5a56
--- /dev/null
+++ b/dexgen/src/com/android/dexgen/util/DexJarMaker.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * 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 com.android.dexgen.util;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.util.jar.Attributes;
+import java.util.jar.JarEntry;
+import java.util.jar.JarOutputStream;
+import java.util.jar.Manifest;
+
+/**
+ * Helper class used to encapsulate generated .dex file into .jar
+ * so that it fits {@code DexClassLoader} constructor.
+ */
+public class DexJarMaker {
+
+    /** indicates name of the dex file added to jar */
+    public static final String DEX_FILE_NAME_IN_JAR = "classes" + PathHolder.DEX_FILE_EXTENSION;
+
+    /** {@code non-null;} storage for all the paths related to current dex file */
+    private final PathHolder pathHolder;
+
+    public DexJarMaker(PathHolder pathHolder) {
+        this.pathHolder = pathHolder;
+    }
+
+    /** Packs previously added files into a single jar archive. */
+    public void create() throws DexClassLoadingException {
+        Manifest manifest = new Manifest();
+        manifest.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0");
+        JarOutputStream target = null;
+        try {
+            target = new JarOutputStream(
+                    new BufferedOutputStream(new FileOutputStream(pathHolder.getJarFilePath())),
+                    manifest);
+            add(new File(pathHolder.getDexFilePath()), target);
+
+        } catch (IOException e) {
+            throw new DexClassLoadingException(e);
+        }
+        finally {
+            try {
+                if (target != null) {
+                    target.close();
+                }
+            } catch(IOException e) {
+                // Ignoring deliberately in order to keep the original exception clear.
+            }
+        }
+    }
+
+    /**
+     * Adds indicated file to the requested archive.
+     *
+     * @param source {@code non-null;} dex file to add
+     * @param target {@code non-null;} target jar archive
+     * @throws IOException
+     */
+    private void add(File source, JarOutputStream target) throws IOException {
+
+        if (!source.isFile()) {
+            throw new IllegalArgumentException("Wrong source dex file provided");
+        }
+
+        BufferedInputStream in = new BufferedInputStream(new FileInputStream(source));
+        JarEntry entry = new JarEntry(DEX_FILE_NAME_IN_JAR);
+        entry.setTime(source.lastModified());
+        target.putNextEntry(entry);
+
+        int curr = -1;
+        while ((curr = in.read()) != -1) {
+            target.write(curr);
+        }
+        target.closeEntry();
+    }
+}
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