Reset to 9bd6dac4708ad94fd0257c53e977df62b152e20c

The bulk merge from -bayo to klp-dev should not have been merged to master.

Change-Id: I527a03a76f5247e4939a672f27c314dc11cbb854

1 files changed, 120 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/latin/makedict/SparseTableContentReader.java b/java/src/com/android/inputmethod/latin/makedict/SparseTableContentReader.java
new file mode 100644
index 000000000..06088b651
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/makedict/SparseTableContentReader.java
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2013 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.makedict;
+
+import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.DictBuffer;
+import com.android.inputmethod.latin.makedict.DictDecoder.DictionaryBufferFactory;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+/**
+ * An auxiliary class for reading SparseTable and data written by SparseTableContentWriter.
+ */
+public class SparseTableContentReader {
+
+    /**
+     * An interface of a function which is passed to SparseTableContentReader.read.
+     */
+    public interface SparseTableContentReaderInterface {
+        /**
+         * Reads data.
+         *
+         * @param buffer the DictBuffer. The position of the buffer is set to the head of data.
+         */
+        public void read(final DictBuffer buffer);
+    }
+
+    protected final int mContentCount;
+    protected final int mBlockSize;
+    protected final File mBaseDir;
+    protected final File mLookupTableFile;
+    protected final File[] mAddressTableFiles;
+    protected final File[] mContentFiles;
+    protected DictBuffer mLookupTableBuffer;
+    protected final DictBuffer[] mAddressTableBuffers;
+    private final DictBuffer[] mContentBuffers;
+    protected final DictionaryBufferFactory mFactory;
+
+    /**
+     * Sole constructor of SparseTableContentReader.
+     *
+     * @param name the name of SparseTable.
+     * @param blockSize the block size of the content table.
+     * @param baseDir the directory which contains the files of the content table.
+     * @param contentFilenames the file names of content files.
+     * @param contentIds the ids of contents. These ids are used for a suffix of a name of
+     * address files and content files.
+     * @param factory the DictionaryBufferFactory which is used for opening the files.
+     */
+    public SparseTableContentReader(final String name, final int blockSize, final File baseDir,
+            final String[] contentFilenames, final String[] contentIds,
+            final DictionaryBufferFactory factory) {
+        if (contentFilenames.length != contentIds.length) {
+            throw new RuntimeException("The length of contentFilenames and the length of"
+                    + " contentIds are different " + contentFilenames.length + ", "
+                    + contentIds.length);
+        }
+        mBlockSize = blockSize;
+        mBaseDir = baseDir;
+        mFactory = factory;
+        mContentCount = contentFilenames.length;
+        mLookupTableFile = new File(baseDir, name + FormatSpec.LOOKUP_TABLE_FILE_SUFFIX);
+        mAddressTableFiles = new File[mContentCount];
+        mContentFiles = new File[mContentCount];
+        for (int i = 0; i < mContentCount; ++i) {
+            mAddressTableFiles[i] = new File(mBaseDir,
+                    name + FormatSpec.CONTENT_TABLE_FILE_SUFFIX + contentIds[i]);
+            mContentFiles[i] = new File(mBaseDir, contentFilenames[i] + contentIds[i]);
+        }
+        mAddressTableBuffers = new DictBuffer[mContentCount];
+        mContentBuffers = new DictBuffer[mContentCount];
+    }
+
+    public void openBuffers() throws FileNotFoundException, IOException {
+        mLookupTableBuffer = mFactory.getDictionaryBuffer(mLookupTableFile);
+        for (int i = 0; i < mContentCount; ++i) {
+            mAddressTableBuffers[i] = mFactory.getDictionaryBuffer(mAddressTableFiles[i]);
+            mContentBuffers[i] = mFactory.getDictionaryBuffer(mContentFiles[i]);
+        }
+    }
+
+    protected void read(final int contentIndex, final int index,
+            final SparseTableContentReaderInterface reader) {
+        if (index < 0 || (index / mBlockSize) * SparseTable.SIZE_OF_INT_IN_BYTES
+                >= mLookupTableBuffer.limit()) {
+            return;
+        }
+
+        mLookupTableBuffer.position((index / mBlockSize) * SparseTable.SIZE_OF_INT_IN_BYTES);
+        final int posInAddressTable = mLookupTableBuffer.readInt();
+        if (posInAddressTable == SparseTable.NOT_EXIST) {
+            return;
+        }
+
+        mAddressTableBuffers[contentIndex].position(
+                (posInAddressTable + index % mBlockSize) * SparseTable.SIZE_OF_INT_IN_BYTES);
+        final int address = mAddressTableBuffers[contentIndex].readInt();
+        if (address == SparseTable.NOT_EXIST) {
+            return;
+        }
+
+        mContentBuffers[contentIndex].position(address);
+        reader.read(mContentBuffers[contentIndex]);
+    }
+}
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