Change the dictionary file passing schema to a list of ids

The dictionary filename used to be passed directly to Latin IME.
This change implements, on the part of Latin IME, the passing of
them as an id that should then be passed through
openAssetFileDescriptor.

Bug: 5095140
Change-Id: I7d1e9d57c19f0645045368f68681680f238189fc

1 files changed, 56 insertions, 10 deletions

diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionaryFileDumper.java b/java/src/com/android/inputmethod/latin/BinaryDictionaryFileDumper.java
index 41b577cf3..1c7599442 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionaryFileDumper.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionaryFileDumper.java
@@ -20,8 +20,10 @@ import android.content.ContentResolver;
 import android.content.Context;
 import android.content.res.AssetFileDescriptor;
 import android.content.res.Resources;
+import android.database.Cursor;
 import android.net.Uri;
 import android.text.TextUtils;
+import android.util.Log;
 
 import java.io.File;
 import java.io.FileInputStream;
@@ -29,7 +31,8 @@ import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
-import java.util.Arrays;
+import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
 
@@ -43,6 +46,8 @@ public class BinaryDictionaryFileDumper {
      */
     static final int FILE_READ_BUFFER_SIZE = 1024;
 
+    private static final String DICTIONARY_PROJECTION[] = { "id" };
+
     // Prevents this class to be accidentally instantiated.
     private BinaryDictionaryFileDumper() {
     }
@@ -75,6 +80,7 @@ public class BinaryDictionaryFileDumper {
     /**
      * Return for a given locale the provider URI to query to get the dictionary.
      */
+    // TODO: remove this
     public static Uri getProviderUri(Locale locale) {
         return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT)
                 .authority(BinaryDictionary.DICTIONARY_PACK_AUTHORITY).appendPath(
@@ -82,6 +88,40 @@ public class BinaryDictionaryFileDumper {
     }
 
     /**
+     * Return for a given locale or dictionary id the provider URI to get the dictionary.
+     */
+    private static Uri getProviderUri(String path) {
+        return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT)
+                .authority(BinaryDictionary.DICTIONARY_PACK_AUTHORITY).appendPath(
+                        path).build();
+    }
+
+    /**
+     * Queries a content provider for the list of dictionaries for a specific locale
+     * available to copy into Latin IME.
+     */
+    private static List<String> getDictIdList(final Locale locale, final Context context) {
+        final ContentResolver resolver = context.getContentResolver();
+        final Uri dictionaryPackUri = getProviderUri(locale);
+
+        final Cursor c = resolver.query(dictionaryPackUri, DICTIONARY_PROJECTION, null, null, null);
+        if (null == c) return Collections.<String>emptyList();
+        if (c.getCount() <= 0 || !c.moveToFirst()) {
+            c.close();
+            return Collections.<String>emptyList();
+        }
+
+        final List<String> list = new ArrayList<String>();
+        do {
+            final String id = c.getString(0);
+            if (TextUtils.isEmpty(id)) continue;
+            list.add(id);
+        } while (c.moveToNext());
+        c.close();
+        return list;
+    }
+
+    /**
      * Queries a content provider for dictionary data for some locale and returns the file addresses
      *
      * This will query a content provider for dictionary data for a given locale, and return
@@ -95,20 +135,26 @@ public class BinaryDictionaryFileDumper {
      * @throw FileNotFoundException if the provider returns non-existent data.
      * @throw IOException if the provider-returned data could not be read.
      */
-    public static List<AssetFileAddress> getDictSetFromContentProvider(Locale locale,
-            Context context) throws FileNotFoundException, IOException {
+    public static List<AssetFileAddress> getDictSetFromContentProvider(final Locale locale,
+            final Context context) throws FileNotFoundException, IOException {
         // TODO: check whether the dictionary is the same or not and if it is, return the cached
         // file.
         // TODO: This should be able to read a number of files from the dictionary pack, copy
         // them all and return them.
         final ContentResolver resolver = context.getContentResolver();
-        final Uri dictionaryPackUri = getProviderUri(locale);
-        final AssetFileDescriptor afd = resolver.openAssetFileDescriptor(dictionaryPackUri, "r");
-        if (null == afd) return null;
-        final String fileName =
-                copyFileTo(afd.createInputStream(), getCacheFileNameForLocale(locale, context));
-        afd.close();
-        return Arrays.asList(AssetFileAddress.makeFromFileName(fileName));
+        final List<String> idList = getDictIdList(locale, context);
+        final List<AssetFileAddress> fileAddressList = new ArrayList<AssetFileAddress>();
+        for (String id : idList) {
+            final Uri dictionaryPackUri = getProviderUri(id);
+            final AssetFileDescriptor afd =
+                    resolver.openAssetFileDescriptor(dictionaryPackUri, "r");
+            if (null == afd) continue;
+            final String fileName =
+                    copyFileTo(afd.createInputStream(), getCacheFileNameForLocale(locale, context));
+            afd.close();
+            fileAddressList.add(AssetFileAddress.makeFromFileName(fileName));
+        }
+        return fileAddressList;
     }
 
     /**