Add different ways of reading the dictionary file.

This change adds basic support for an external dictionary provider.
It adds methods for reading the dictionary itself from an asset in
the dictionary provider package directly, obtaining the file name
through the ContentProvider interface; it also adds a way of getting
the data through an InputStream and copying the file locally.

Incidentally this change also adds the code needed to listen for
updating the dictionary provider package and reloading it in time.

This change also goes hand-in-hand with Iab31db6e, which implements
the small closed part of this.

Issue: 3414944

Change-Id: I5e4fff99a59bb99dbdb002102db6c90e6cb41c8a

1 files changed, 83 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/latin/DictionaryPackInstallBroadcastReceiver.java b/java/src/com/android/inputmethod/latin/DictionaryPackInstallBroadcastReceiver.java
new file mode 100644
index 000000000..7a3bcd8f7
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/DictionaryPackInstallBroadcastReceiver.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2011 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.inputmethod.latin;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.ProviderInfo;
+import android.net.Uri;
+
+/**
+ * Takes action to reload the necessary data when a dictionary pack was added/removed.
+ */
+public class DictionaryPackInstallBroadcastReceiver extends BroadcastReceiver {
+
+    final LatinIME mService;
+
+    public DictionaryPackInstallBroadcastReceiver(final LatinIME service) {
+        mService = service;
+    }
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        final String action = intent.getAction();
+        final PackageManager manager = context.getPackageManager();
+
+        // We need to reread the dictionary if a new dictionary package is installed.
+        if (action.equals(Intent.ACTION_PACKAGE_ADDED)) {
+            final Uri packageUri = intent.getData();
+            if (null == packageUri) return; // No package name : we can't do anything
+            final String packageName = packageUri.getSchemeSpecificPart();
+            if (null == packageName) return;
+            final PackageInfo packageInfo;
+            try {
+                packageInfo = manager.getPackageInfo(packageName, PackageManager.GET_PROVIDERS);
+            } catch (android.content.pm.PackageManager.NameNotFoundException e) {
+                return; // No package info : we can't do anything
+            }
+            final ProviderInfo[] providers = packageInfo.providers;
+            if (null == providers) return; // No providers : it is not a dictionary.
+
+            // Search for some dictionary pack in the just-installed package. If found, reread.
+            boolean found = false;
+            for (ProviderInfo info : providers) {
+                if (BinaryDictionary.DICTIONARY_PACK_AUTHORITY.equals(info.authority)) {
+                    mService.resetSuggestMainDict();
+                    return;
+                }
+            }
+            // If we come here none of the authorities matched the one we searched for.
+            // We can exit safely.
+            return;
+        } else if (action.equals(Intent.ACTION_PACKAGE_REMOVED)
+                && !intent.getBooleanExtra(Intent.EXTRA_REPLACING, false)) {
+            // When the dictionary package is removed, we need to reread dictionary (to use the
+            // next-priority one, or stop using a dictionary at all if this was the only one,
+            // since this is the user request).
+            // If we are replacing the package, we will receive ADDED right away so no need to
+            // remove the dictionary at the moment, since we will do it when we receive the
+            // ADDED broadcast.
+
+            // TODO: Only reload dictionary on REMOVED when the removed package is the one we
+            // read dictionary from?
+            mService.resetSuggestMainDict();
+        }
+    }
+}