Move //webapk to //chrome/android/webapk

webapk/shell_apk/src/org/chromium/webapk/shell_apk/WebApkApplication.java

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.webapk.shell_apk;
-
-import android.app.Application;
-import android.content.Context;
-import android.util.Log;
-
-import org.chromium.webapk.lib.common.WebApkUtils;
-
-import java.lang.reflect.Array;
-import java.util.List;
-
-/**
- * Example application for a minted APK.
- */
-public class WebApkApplication extends Application {
-    // Context of Chrome.
-    private Context mRemoteContext = null;
-
-    private static final String TAG = "cr.WebApkApplication";
-    /**
-     * Copy all the objects from a specified field of the hostInstance to the same field of the
-     * mintInstance. As a result, the given field of the mintInstance will contain all the
-     * objects from both instances.
-     * @param mintInstance the first instance which contains a field of the given fieldName.
-     * @param fieldName the name of field to expand to an Object array.
-     * @param hostInstance the second instance which has a field of the given fieldName.
-     * @throws NoSuchFieldException
-     * @throws IllegalArgumentException
-     * @throws IllegalAccessException
-     */
-    private static void expandField(Object mintInstance, String fieldName, Object hostInstance)
-            throws NoSuchFieldException, IllegalArgumentException,
-            IllegalAccessException {
-        try {
-            Object hostCurrentDirs = Reflect.getField(hostInstance, fieldName);
-            Object mintCurrentDirs = Reflect.getField(mintInstance, fieldName);
-            // Switched from an array to an ArrayList in Lollipop.
-            if (mintCurrentDirs instanceof List) {
-                List<Object> mintDirsAsList = (List<Object>) mintCurrentDirs;
-                concatAndRemoveEndDuplicates(mintDirsAsList, (List<Object>) hostCurrentDirs);
-            } else {
-                Object[] mintDirsAsArray = (Object[]) mintCurrentDirs;
-                Object[] hostDirsAsArray = (Object[]) hostCurrentDirs;
-                Reflect.setField(mintInstance, fieldName,
-                        concatAndRemoveEndDuplicates(mintDirsAsArray, hostDirsAsArray));
-            }
-        } catch (ReflectiveOperationException e) {
-            e.printStackTrace();
-        }
-    }
-
-    /**
-     * Combines two arrays into a new array.
-     * If the two arrays end with duplicated elements, keep one copy only. For example,
-     * the first array is [A, B, C, D], and the second array is [E, F, C, D], the combined one is
-     * [A, B, E, F, C, D]. The unique elements are stored before the duplicates.
-     *  The arrays must be of the same type.
-     * @param mintArrays: the array from a WebAPK
-     * @param hostArrays: the array from the host
-     * @return: a combined array consists of [WebAPK unique elements, host's unique elements,
-     *  duplicated one]
-     */
-    private static Object[] concatAndRemoveEndDuplicates(Object[] mintArrays, Object[] hostArrays) {
-        int duplicate1 = mintArrays.length - 1;
-        int duplicate2 = hostArrays.length - 1;
-        int count = 0;
-        while (duplicate1 >= 0 && duplicate2 >= 0
-                && mintArrays[duplicate1].toString().equals(hostArrays[duplicate2].toString())) {
-            --duplicate1;
-            --duplicate2;
-            ++count;
-        }
-        Object[] combined = (Object[]) Array.newInstance(mintArrays.getClass().getComponentType(),
-                mintArrays.length + hostArrays.length - count);
-        if (mintArrays.length - count > 0) {
-            System.arraycopy(mintArrays, 0, combined, 0, mintArrays.length - count);
-        }
-        System.arraycopy(hostArrays, 0, combined, mintArrays.length - count, hostArrays.length);
-        return combined;
-    }
-
-    /**
-     * Add the unique elements of the second list to the first one.
-     * If the two lists end with duplicated elements, keep one copy only. For example,
-     * the first list is [A, B, C, D], and the second list is [E, F, C, D], the combined one is
-     * [A, B, E, F, C, D]. The unique elements are store before the duplicates.
-     * The lists must be of the same type.
-     * @param mintList: the list from a WebAPK
-     * @param hostList: the list from the host
-     * @return: a combined list consists of [WebAPK unique elements, host's unique elements,
-     *  duplicated one]
-     */
-    private static void concatAndRemoveEndDuplicates(List<Object> mintList, List<Object> hostList) {
-        int duplicate1 = mintList.size() - 1;
-        int duplicate2 = hostList.size() - 1;
-        while (duplicate1 >= 0 && duplicate2 >= 0
-                && mintList.get(duplicate1).toString().equals(hostList.get(duplicate2).toString()))
-        {
-            --duplicate1;
-            --duplicate2;
-        }
-        for (int i = 0; i < duplicate2 + 1; i++) {
-            mintList.add(duplicate1 + i, hostList.get(i));
-        }
-    }
-
-    private void addExternalLoader() throws ReflectiveOperationException {
-        if (mRemoteContext == null) {
-            Log.w(TAG, "Failed to add external loader since the remote context is null.");
-            return;
-        }
-        ClassLoader externalLoader = mRemoteContext.getClassLoader();
-        ClassLoader mintLoader = getClassLoader();
-
-        Object extDexPathList = Reflect.getField(externalLoader, "pathList");
-        Object mintDexPathList = Reflect.getField(mintLoader, "pathList");
-        expandField(mintDexPathList, "dexElements", extDexPathList);
-    }
-
-    private void addNativeLibrarySearchPath() throws ReflectiveOperationException {
-        if (mRemoteContext == null) {
-            Log.w(TAG, "Failed to add external loader since the remote context is null.");
-            return;
-        }
-        ClassLoader externalLoader = mRemoteContext.getClassLoader();
-        ClassLoader mintLoader = getClassLoader();
-
-        // Since both WebAPK and its host have the "system/lib" and "vendor/lib" at the end of
-        // the native library directory path list, we want to add host's directories before the
-        // system directory, and only keep one copy of the system directories.
-        // This is because when System.loadLibrary() is called, we want it search the host's
-        // native library directories first. If a ".so" file doesn't exit, then search /system/lib.
-        Object extDexPathList = Reflect.getField(externalLoader, "pathList");
-        Object mintDexPathList = Reflect.getField(mintLoader, "pathList");
-        expandField(mintDexPathList, "nativeLibraryDirectories", extDexPathList);
-        expandField(mintDexPathList, "nativeLibraryPathElements", extDexPathList);
-    }
-
-    @Override
-    public void onCreate() {
-        super.onCreate();
-        mRemoteContext = WebApkUtils.getHostBrowserContext(this);
-        try {
-            addExternalLoader();
-            addNativeLibrarySearchPath();
-        } catch (ReflectiveOperationException e) {
-            e.printStackTrace();
-        }
-        Log.w(TAG, "Successfully add external loader.");
-    }
-}