1 files changed, 269 insertions, 0 deletions
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
new file mode 100644
index 000000000..75b75ae2e
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
@@ -0,0 +1,269 @@
+/*
+/*
+ * 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.annotations.UsedForTesting;
+import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.CharEncoding;
+import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
+import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
+import com.android.inputmethod.latin.makedict.FusionDictionary.DictionaryOptions;
+import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
+import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
+import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.Iterator;
+
+/**
+ * An implementation of DictEncoder for version 4 binary dictionary.
+ */
+@UsedForTesting
+public class Ver4DictEncoder implements DictEncoder {
+    private final File mDictPlacedDir;
+    private byte[] mTrieBuf;
+    private byte[] mFreqBuf;
+    private int mTriePos;
+    private OutputStream mTrieOutStream;
+    private OutputStream mFreqOutStream;
+
+    @UsedForTesting
+    public Ver4DictEncoder(final File dictPlacedDir) {
+        mDictPlacedDir = dictPlacedDir;
+    }
+
+    private void openStreams(final FormatOptions formatOptions, final DictionaryOptions dictOptions)
+            throws FileNotFoundException, IOException {
+        final FileHeader header = new FileHeader(0, dictOptions, formatOptions);
+        final String filename = header.getId() + "." + header.getVersion();
+        final File mDictDir = new File(mDictPlacedDir, filename);
+        final File trieFile = new File(mDictDir, filename + FormatSpec.TRIE_FILE_EXTENSION);
+        final File freqFile = new File(mDictDir, filename + FormatSpec.FREQ_FILE_EXTENSION);
+        if (!mDictDir.isDirectory()) {
+            if (mDictDir.exists()) mDictDir.delete();
+            mDictDir.mkdirs();
+        }
+        if (!trieFile.exists()) trieFile.createNewFile();
+        if (!freqFile.exists()) freqFile.createNewFile();
+        mTrieOutStream = new FileOutputStream(trieFile);
+        mFreqOutStream = new FileOutputStream(freqFile);
+    }
+
+    private void close() throws IOException {
+        try {
+            if (mTrieOutStream != null) {
+                mTrieOutStream.close();
+            }
+            if (mFreqOutStream != null) {
+                mFreqOutStream.close();
+            }
+        } finally {
+            mTrieOutStream = null;
+            mFreqOutStream = null;
+        }
+    }
+
+    @Override
+    public void writeDictionary(final FusionDictionary dict, final FormatOptions formatOptions)
+            throws IOException, UnsupportedFormatException {
+        if (formatOptions.mVersion != FormatSpec.VERSION4) {
+            throw new UnsupportedFormatException("File header has a wrong version number : "
+                    + formatOptions.mVersion);
+        }
+        if (!mDictPlacedDir.isDirectory()) {
+            throw new UnsupportedFormatException("Given path is not a directory.");
+        }
+
+        if (mTrieOutStream == null) {
+            openStreams(formatOptions, dict.mOptions);
+        }
+
+        BinaryDictEncoderUtils.writeDictionaryHeader(mTrieOutStream, dict, formatOptions);
+
+        MakedictLog.i("Flattening the tree...");
+        ArrayList<PtNodeArray> flatNodes = BinaryDictEncoderUtils.flattenTree(dict.mRootNodeArray);
+        int terminalCount = 0;
+        for (final PtNodeArray array : flatNodes) {
+            for (final PtNode node : array.mData) {
+                if (node.isTerminal()) node.mTerminalId = terminalCount++;
+            }
+        }
+
+        MakedictLog.i("Computing addresses...");
+        BinaryDictEncoderUtils.computeAddresses(dict, flatNodes, formatOptions);
+        if (MakedictLog.DBG) BinaryDictEncoderUtils.checkFlatPtNodeArrayList(flatNodes);
+
+        final PtNodeArray lastNodeArray = flatNodes.get(flatNodes.size() - 1);
+        final int bufferSize = lastNodeArray.mCachedAddressAfterUpdate + lastNodeArray.mCachedSize;
+        mTrieBuf = new byte[bufferSize];
+        mFreqBuf = new byte[terminalCount * FormatSpec.FREQUENCY_AND_FLAGS_SIZE];
+
+        MakedictLog.i("Writing file...");
+        for (PtNodeArray nodeArray : flatNodes) {
+            BinaryDictEncoderUtils.writePlacedPtNodeArray(dict, this, nodeArray, formatOptions);
+        }
+        if (MakedictLog.DBG) {
+            BinaryDictEncoderUtils.showStatistics(flatNodes);
+            MakedictLog.i("has " + terminalCount + " terminals.");
+        }
+        mTrieOutStream.write(mTrieBuf);
+        mFreqOutStream.write(mFreqBuf);
+
+        MakedictLog.i("Done");
+        close();
+    }
+
+    @Override
+    public void setPosition(int position) {
+        if (mTrieBuf == null || position < 0 || position >- mTrieBuf.length) return;
+        mTriePos = position;
+    }
+
+    @Override
+    public int getPosition() {
+        return mTriePos;
+    }
+
+    @Override
+    public void writePtNodeCount(int ptNodeCount) {
+        final int countSize = BinaryDictIOUtils.getPtNodeCountSize(ptNodeCount);
+        // ptNodeCount must fit on one byte or two bytes.
+        // Please see comments in FormatSpec
+        if (countSize != 1 && countSize != 2) {
+            throw new RuntimeException("Strange size from getPtNodeCountSize : " + countSize);
+        }
+        mTriePos = BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, mTriePos, ptNodeCount,
+                countSize);
+    }
+
+    private void writePtNodeFlags(final PtNode ptNode, final int parentAddress,
+            final FormatOptions formatOptions) {
+        final int childrenPos = BinaryDictEncoderUtils.getChildrenPosition(ptNode, formatOptions);
+        mTriePos = BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, mTriePos,
+                BinaryDictEncoderUtils.makePtNodeFlags(ptNode, mTriePos, childrenPos,
+                        formatOptions),
+                FormatSpec.PTNODE_FLAGS_SIZE);
+    }
+
+    private void writeParentPosition(int parentPos, final PtNode ptNode,
+            final FormatOptions formatOptions) {
+        if (parentPos != FormatSpec.NO_PARENT_ADDRESS) {
+            parentPos -= ptNode.mCachedAddressAfterUpdate;
+        }
+        mTriePos = BinaryDictEncoderUtils.writeParentAddress(mTrieBuf, mTriePos, parentPos,
+                formatOptions);
+    }
+
+    private void writeCharacters(final int[] characters, final boolean hasSeveralChars) {
+        mTriePos = CharEncoding.writeCharArray(characters, mTrieBuf, mTriePos);
+        if (hasSeveralChars) {
+            mTrieBuf[mTriePos++] = FormatSpec.PTNODE_CHARACTERS_TERMINATOR;
+        }
+    }
+
+    private void writeTerminalId(final int terminalId) {
+        mTriePos = BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, mTriePos, terminalId,
+                FormatSpec.PTNODE_TERMINAL_ID_SIZE);
+    }
+
+    private void writeFrequency(final int frequency, final int terminalId) {
+        final int freqPos = terminalId * FormatSpec.FREQUENCY_AND_FLAGS_SIZE;
+        BinaryDictEncoderUtils.writeUIntToBuffer(mFreqBuf, freqPos, frequency,
+                FormatSpec.FREQUENCY_AND_FLAGS_SIZE);
+    }
+
+    private void writeChildrenPosition(PtNode ptNode, FormatOptions formatOptions) {
+        final int childrenPos = BinaryDictEncoderUtils.getChildrenPosition(ptNode, formatOptions);
+        if (formatOptions.mSupportsDynamicUpdate) {
+            mTriePos += BinaryDictEncoderUtils.writeSignedChildrenPosition(mTrieBuf,
+                    mTriePos, childrenPos);
+        } else {
+            mTriePos += BinaryDictEncoderUtils.writeChildrenPosition(mTrieBuf,
+                    mTriePos, childrenPos);
+        }
+    }
+
+    private void writeShortcuts(ArrayList<WeightedString> shortcuts) {
+        if (null == shortcuts || shortcuts.isEmpty()) return;
+
+        final int indexOfShortcutByteSize = mTriePos;
+        mTriePos += FormatSpec.PTNODE_SHORTCUT_LIST_SIZE_SIZE;
+        final Iterator<WeightedString> shortcutIterator = shortcuts.iterator();
+        while (shortcutIterator.hasNext()) {
+            final WeightedString target = shortcutIterator.next();
+            final int shortcutFlags = BinaryDictEncoderUtils.makeShortcutFlags(
+                    shortcutIterator.hasNext(),
+                    target.mFrequency);
+            mTrieBuf[mTriePos++] = (byte)shortcutFlags;
+            final int shortcutShift = CharEncoding.writeString(mTrieBuf, mTriePos,
+                    target.mWord);
+            mTriePos += shortcutShift;
+        }
+        final int shortcutByteSize = mTriePos - indexOfShortcutByteSize;
+        if (shortcutByteSize > FormatSpec.MAX_SHORTCUT_LIST_SIZE_IN_A_PTNODE) {
+            throw new RuntimeException("Shortcut list too large : " + shortcutByteSize);
+        }
+        BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, indexOfShortcutByteSize,
+                shortcutByteSize, FormatSpec.PTNODE_SHORTCUT_LIST_SIZE_SIZE);
+    }
+
+    private void writeBigrams(ArrayList<WeightedString> bigrams, FusionDictionary dict) {
+        if (bigrams == null) return;
+
+        final Iterator<WeightedString> bigramIterator = bigrams.iterator();
+        while (bigramIterator.hasNext()) {
+            final WeightedString bigram = bigramIterator.next();
+            final PtNode target =
+                    FusionDictionary.findWordInTree(dict.mRootNodeArray, bigram.mWord);
+            final int addressOfBigram = target.mCachedAddressAfterUpdate;
+            final int unigramFrequencyForThisWord = target.mFrequency;
+            final int offset = addressOfBigram
+                    - (mTriePos + FormatSpec.PTNODE_ATTRIBUTE_FLAGS_SIZE);
+            int bigramFlags = BinaryDictEncoderUtils.makeBigramFlags(bigramIterator.hasNext(),
+                    offset, bigram.mFrequency, unigramFrequencyForThisWord, bigram.mWord);
+            mTrieBuf[mTriePos++] = (byte) bigramFlags;
+            mTriePos += BinaryDictEncoderUtils.writeChildrenPosition(mTrieBuf,
+                    mTriePos, Math.abs(offset));
+        }
+    }
+
+    @Override
+    public void writeForwardLinkAddress(int forwardLinkAddress) {
+        mTriePos = BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, mTriePos,
+                forwardLinkAddress, FormatSpec.FORWARD_LINK_ADDRESS_SIZE);
+    }
+
+    @Override
+    public void writePtNode(final PtNode ptNode, final int parentPosition,
+            final FormatOptions formatOptions, final FusionDictionary dict) {
+        writePtNodeFlags(ptNode, parentPosition, formatOptions);
+        writeParentPosition(parentPosition, ptNode, formatOptions);
+        writeCharacters(ptNode.mChars, ptNode.hasSeveralChars());
+        if (ptNode.isTerminal()) {
+            writeTerminalId(ptNode.mTerminalId);
+            writeFrequency(ptNode.mFrequency, ptNode.mTerminalId);
+        }
+        writeChildrenPosition(ptNode, formatOptions);
+        writeShortcuts(ptNode.mShortcutTargets);
+        writeBigrams(ptNode.mBigrams, dict);
+    }
+}