Merge "Add different ways of reading the dictionary file."

1 files changed, 52 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/latin/AssetFileAddress.java b/java/src/com/android/inputmethod/latin/AssetFileAddress.java
new file mode 100644
index 000000000..074ecacc5
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/AssetFileAddress.java
@@ -0,0 +1,52 @@
+/*
+ * 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 java.io.File;
+
+/**
+ * Immutable class to hold the address of an asset.
+ * As opposed to a normal file, an asset is usually represented as a contiguous byte array in
+ * the package file. Open it correctly thus requires the name of the package it is in, but
+ * also the offset in the file and the length of this data. This class encapsulates these three.
+ */
+class AssetFileAddress {
+    public final String mFilename;
+    public final long mOffset;
+    public final long mLength;
+
+    public AssetFileAddress(final String filename, final long offset, final long length) {
+        mFilename = filename;
+        mOffset = offset;
+        mLength = length;
+    }
+
+    public static AssetFileAddress makeFromFileName(final String filename) {
+        if (null == filename) return null;
+        File f = new File(filename);
+        if (null == f || !f.isFile()) return null;
+        return new AssetFileAddress(filename, 0l, f.length());
+    }
+
+    public static AssetFileAddress makeFromFileNameAndOffset(final String filename,
+            final long offset, final long length) {
+        if (null == filename) return null;
+        File f = new File(filename);
+        if (null == f || !f.isFile()) return null;
+        return new AssetFileAddress(filename, offset, length);
+    }
+}