1 files changed, 279 insertions, 0 deletions
diff --git a/tests/src/com/android/inputmethod/latin/makedict/Ver2DictEncoder.java b/tests/src/com/android/inputmethod/latin/makedict/Ver2DictEncoder.java
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+++ b/tests/src/com/android/inputmethod/latin/makedict/Ver2DictEncoder.java
@@ -0,0 +1,279 @@
+/*
+ * 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.BinaryDictEncoderUtils.CodePointTable;
+import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
+import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
+import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
+
+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.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map.Entry;
+
+/**
+ * An implementation of DictEncoder for version 2 binary dictionary.
+ */
+@UsedForTesting
+public class Ver2DictEncoder implements DictEncoder {
+
+    private final File mDictFile;
+    private OutputStream mOutStream;
+    private byte[] mBuffer;
+    private int mPosition;
+    private final int mCodePointTableMode;
+    public static final int CODE_POINT_TABLE_OFF = 0;
+    public static final int CODE_POINT_TABLE_ON = 1;
+
+    @UsedForTesting
+    public Ver2DictEncoder(final File dictFile, final int codePointTableMode) {
+        mDictFile = dictFile;
+        mOutStream = null;
+        mBuffer = null;
+        mCodePointTableMode = codePointTableMode;
+    }
+
+    // This constructor is used only by BinaryDictOffdeviceUtilsTests.
+    // If you want to use this in the production code, you should consider keeping consistency of
+    // the interface of Ver3DictDecoder by using factory.
+    @UsedForTesting
+    public Ver2DictEncoder(final OutputStream outStream) {
+        mDictFile = null;
+        mOutStream = outStream;
+        mCodePointTableMode = CODE_POINT_TABLE_OFF;
+    }
+
+    private void openStream() throws FileNotFoundException {
+        mOutStream = new FileOutputStream(mDictFile);
+    }
+
+    private void close() throws IOException {
+        if (mOutStream != null) {
+            mOutStream.close();
+            mOutStream = null;
+        }
+    }
+
+    // Package for testing
+    static CodePointTable makeCodePointTable(final FusionDictionary dict) {
+        final HashMap<Integer, Integer> codePointOccurrenceCounts = new HashMap<>();
+        for (final WordProperty word : dict) {
+            // Store per code point occurrence
+            final String wordString = word.mWord;
+            for (int i = 0; i < wordString.length(); ++i) {
+                final int codePoint = Character.codePointAt(wordString, i);
+                if (codePointOccurrenceCounts.containsKey(codePoint)) {
+                    codePointOccurrenceCounts.put(codePoint,
+                            codePointOccurrenceCounts.get(codePoint) + 1);
+                } else {
+                    codePointOccurrenceCounts.put(codePoint, 1);
+                }
+            }
+        }
+        final ArrayList<Entry<Integer, Integer>> codePointOccurrenceArray =
+                new ArrayList<>(codePointOccurrenceCounts.entrySet());
+        // Descending order sort by occurrence (value side)
+        Collections.sort(codePointOccurrenceArray, new Comparator<Entry<Integer, Integer>>() {
+            @Override
+            public int compare(final Entry<Integer, Integer> a, final Entry<Integer, Integer> b) {
+                if (a.getValue() != b.getValue()) {
+                    return b.getValue().compareTo(a.getValue());
+                }
+                return b.getKey().compareTo(a.getKey());
+            }
+        });
+        int currentCodePointTableIndex = FormatSpec.MINIMAL_ONE_BYTE_CHARACTER_VALUE;
+        // Temporary map for writing of nodes
+        final HashMap<Integer, Integer> codePointToOneByteCodeMap = new HashMap<>();
+        for (final Entry<Integer, Integer> entry : codePointOccurrenceArray) {
+            // Put a relation from the original code point to the one byte code.
+            codePointToOneByteCodeMap.put(entry.getKey(), currentCodePointTableIndex);
+            if (FormatSpec.MAXIMAL_ONE_BYTE_CHARACTER_VALUE < ++currentCodePointTableIndex) {
+                break;
+            }
+        }
+        // codePointToOneByteCodeMap for writing the trie
+        // codePointOccurrenceArray for writing the header
+        return new CodePointTable(codePointToOneByteCodeMap, codePointOccurrenceArray);
+    }
+
+    @Override
+    public void writeDictionary(final FusionDictionary dict, final FormatOptions formatOptions)
+            throws IOException, UnsupportedFormatException {
+        // We no longer support anything but the latest version of v2.
+        if (formatOptions.mVersion != FormatSpec.VERSION202) {
+            throw new UnsupportedFormatException(
+                    "The given format options has wrong version number : "
+                    + formatOptions.mVersion);
+        }
+
+        if (mOutStream == null) {
+            openStream();
+        }
+
+        // Make code point conversion table ordered by occurrence of code points
+        // Version 201 or later have codePointTable
+        final CodePointTable codePointTable;
+        if (mCodePointTableMode == CODE_POINT_TABLE_OFF || formatOptions.mVersion
+                < FormatSpec.MINIMUM_SUPPORTED_VERSION_OF_CODE_POINT_TABLE) {
+            codePointTable = new CodePointTable();
+        } else {
+            codePointTable = makeCodePointTable(dict);
+        }
+
+        BinaryDictEncoderUtils.writeDictionaryHeader(mOutStream, dict, formatOptions,
+                codePointTable.mCodePointOccurrenceArray);
+
+        // Addresses are limited to 3 bytes, but since addresses can be relative to each node
+        // array, the structure itself is not limited to 16MB. However, if it is over 16MB deciding
+        // the order of the PtNode arrays becomes a quite complicated problem, because though the
+        // dictionary itself does not have a size limit, each node array must still be within 16MB
+        // of all its children and parents. As long as this is ensured, the dictionary file may
+        // grow to any size.
+
+        // Leave the choice of the optimal node order to the flattenTree function.
+        MakedictLog.i("Flattening the tree...");
+        ArrayList<PtNodeArray> flatNodes = BinaryDictEncoderUtils.flattenTree(dict.mRootNodeArray);
+
+        MakedictLog.i("Computing addresses...");
+        BinaryDictEncoderUtils.computeAddresses(dict, flatNodes,
+                codePointTable.mCodePointToOneByteCodeMap);
+        MakedictLog.i("Checking PtNode array...");
+        if (MakedictLog.DBG) BinaryDictEncoderUtils.checkFlatPtNodeArrayList(flatNodes);
+
+        // Create a buffer that matches the final dictionary size.
+        final PtNodeArray lastNodeArray = flatNodes.get(flatNodes.size() - 1);
+        final int bufferSize = lastNodeArray.mCachedAddressAfterUpdate + lastNodeArray.mCachedSize;
+        mBuffer = new byte[bufferSize];
+
+        MakedictLog.i("Writing file...");
+
+        for (PtNodeArray nodeArray : flatNodes) {
+            BinaryDictEncoderUtils.writePlacedPtNodeArray(dict, this, nodeArray,
+                    codePointTable.mCodePointToOneByteCodeMap);
+        }
+        if (MakedictLog.DBG) BinaryDictEncoderUtils.showStatistics(flatNodes);
+        mOutStream.write(mBuffer, 0, mPosition);
+
+        MakedictLog.i("Done");
+        close();
+    }
+
+    @Override
+    public void setPosition(final int position) {
+        if (mBuffer == null || position < 0 || position >= mBuffer.length) return;
+        mPosition = position;
+    }
+
+    @Override
+    public int getPosition() {
+        return mPosition;
+    }
+
+    @Override
+    public void writePtNodeCount(final int ptNodeCount) {
+        final int countSize = BinaryDictIOUtils.getPtNodeCountSize(ptNodeCount);
+        if (countSize != 1 && countSize != 2) {
+            throw new RuntimeException("Strange size from getGroupCountSize : " + countSize);
+        }
+        final int encodedPtNodeCount = (countSize == 2) ?
+                (ptNodeCount | FormatSpec.LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE_FLAG) : ptNodeCount;
+        mPosition = BinaryDictEncoderUtils.writeUIntToBuffer(mBuffer, mPosition, encodedPtNodeCount,
+                countSize);
+    }
+
+    private void writePtNodeFlags(final PtNode ptNode,
+            final HashMap<Integer, Integer> codePointToOneByteCodeMap) {
+        final int childrenPos = BinaryDictEncoderUtils.getChildrenPosition(ptNode,
+                codePointToOneByteCodeMap);
+        mPosition = BinaryDictEncoderUtils.writeUIntToBuffer(mBuffer, mPosition,
+                BinaryDictEncoderUtils.makePtNodeFlags(ptNode, childrenPos),
+                FormatSpec.PTNODE_FLAGS_SIZE);
+    }
+
+    private void writeCharacters(final int[] codePoints, final boolean hasSeveralChars,
+            final HashMap<Integer, Integer> codePointToOneByteCodeMap) {
+        mPosition = CharEncoding.writeCharArray(codePoints, mBuffer, mPosition,
+                codePointToOneByteCodeMap);
+        if (hasSeveralChars) {
+            mBuffer[mPosition++] = FormatSpec.PTNODE_CHARACTERS_TERMINATOR;
+        }
+    }
+
+    private void writeFrequency(final int frequency) {
+        if (frequency >= 0) {
+            mPosition = BinaryDictEncoderUtils.writeUIntToBuffer(mBuffer, mPosition, frequency,
+                    FormatSpec.PTNODE_FREQUENCY_SIZE);
+        }
+    }
+
+    private void writeChildrenPosition(final PtNode ptNode,
+            final HashMap<Integer, Integer> codePointToOneByteCodeMap) {
+        final int childrenPos = BinaryDictEncoderUtils.getChildrenPosition(ptNode,
+                codePointToOneByteCodeMap);
+        mPosition += BinaryDictEncoderUtils.writeChildrenPosition(mBuffer, mPosition,
+                childrenPos);
+    }
+
+    /**
+     * Write a bigram attributes list to mBuffer.
+     *
+     * @param bigrams the bigram attributes list.
+     * @param dict the dictionary the node array is a part of (for relative offsets).
+     */
+    private void writeBigrams(final ArrayList<WeightedString> bigrams,
+            final 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.getProbability();
+            final int offset = addressOfBigram
+                    - (mPosition + FormatSpec.PTNODE_ATTRIBUTE_FLAGS_SIZE);
+            final int bigramFlags = BinaryDictEncoderUtils.makeBigramFlags(bigramIterator.hasNext(),
+                    offset, bigram.getProbability(), unigramFrequencyForThisWord, bigram.mWord);
+            mPosition = BinaryDictEncoderUtils.writeUIntToBuffer(mBuffer, mPosition, bigramFlags,
+                    FormatSpec.PTNODE_ATTRIBUTE_FLAGS_SIZE);
+            mPosition += BinaryDictEncoderUtils.writeChildrenPosition(mBuffer, mPosition,
+                    Math.abs(offset));
+        }
+    }
+
+    @Override
+    public void writePtNode(final PtNode ptNode, final FusionDictionary dict,
+            final HashMap<Integer, Integer> codePointToOneByteCodeMap) {
+        writePtNodeFlags(ptNode, codePointToOneByteCodeMap);
+        writeCharacters(ptNode.mChars, ptNode.hasSeveralChars(), codePointToOneByteCodeMap);
+        writeFrequency(ptNode.getProbability());
+        writeChildrenPosition(ptNode, codePointToOneByteCodeMap);
+        writeBigrams(ptNode.mBigrams, dict);
+    }
+}