Revert "ResearchLogging capture full n-gram data"

This reverts commit 221e756fd7d585f0eb75377b851f23cad24ccd7f

Change-Id: Iefc4e4e27ddc925d4a4634627b0467bd4ee2a66e

1 files changed, 0 insertions, 127 deletions

diff --git a/java/src/com/android/inputmethod/research/MainLogBuffer.java b/java/src/com/android/inputmethod/research/MainLogBuffer.java
deleted file mode 100644
index 745768d35..000000000
--- a/java/src/com/android/inputmethod/research/MainLogBuffer.java
+++ /dev/null
@@ -1,127 +0,0 @@
-/*
- * Copyright (C) 2012 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.research;
-
-import com.android.inputmethod.latin.Dictionary;
-import com.android.inputmethod.latin.Suggest;
-
-import java.util.Random;
-
-public class MainLogBuffer extends LogBuffer {
-    // The size of the n-grams logged.  E.g. N_GRAM_SIZE = 2 means to sample bigrams.
-    private static final int N_GRAM_SIZE = 2;
-    // The number of words between n-grams to omit from the log.
-    private static final int DEFAULT_NUMBER_OF_WORDS_BETWEEN_SAMPLES = 18;
-
-    private final ResearchLog mResearchLog;
-    private Suggest mSuggest;
-
-    // The minimum periodicity with which n-grams can be sampled.  E.g. mWinWordPeriod is 10 if
-    // every 10th bigram is sampled, i.e., words 1-8 are not, but the bigram at words 9 and 10, etc.
-    // for 11-18, and the bigram at words 19 and 20.  If an n-gram is not safe (e.g. it  contains a
-    // number in the middle or an out-of-vocabulary word), then sampling is delayed until a safe
-    // n-gram does appear.
-    /* package for test */ int mMinWordPeriod;
-
-    // Counter for words left to suppress before an n-gram can be sampled.  Reset to mMinWordPeriod
-    // after a sample is taken.
-    /* package for test */ int mWordsUntilSafeToSample;
-
-    public MainLogBuffer(final ResearchLog researchLog) {
-        super(N_GRAM_SIZE);
-        mResearchLog = researchLog;
-        mMinWordPeriod = DEFAULT_NUMBER_OF_WORDS_BETWEEN_SAMPLES + N_GRAM_SIZE;
-        final Random random = new Random();
-        mWordsUntilSafeToSample = random.nextInt(mMinWordPeriod);
-    }
-
-    public void setSuggest(Suggest suggest) {
-        mSuggest = suggest;
-    }
-
-    @Override
-    public void shiftIn(final LogUnit newLogUnit) {
-        super.shiftIn(newLogUnit);
-        if (newLogUnit.hasWord()) {
-            if (mWordsUntilSafeToSample > 0) {
-                mWordsUntilSafeToSample--;
-            }
-        }
-    }
-
-    public void resetWordCounter() {
-        mWordsUntilSafeToSample = mMinWordPeriod;
-    }
-
-    /**
-     * Determines whether the content of the MainLogBuffer can be safely uploaded in its complete
-     * form and still protect the user's privacy.
-     *
-     * The size of the MainLogBuffer is just enough to hold one n-gram, its corrections, and any
-     * non-character data that is typed between words.  The decision about privacy is made based on
-     * the buffer's entire content.  If it is decided that the privacy risks are too great to upload
-     * the contents of this buffer, a censored version of the LogItems may still be uploaded.  E.g.,
-     * the screen orientation and other characteristics about the device can be uploaded without
-     * revealing much about the user.
-     */
-    public boolean isSafeToLog() {
-        // Check that we are not sampling too frequently.  Having sampled recently might disclose
-        // too much of the user's intended meaning.
-        if (mWordsUntilSafeToSample > 0) {
-            return false;
-        }
-        if (mSuggest == null || !mSuggest.hasMainDictionary()) {
-            // Main dictionary is unavailable.  Since we cannot check it, we cannot tell if a word
-            // is out-of-vocabulary or not.  Therefore, we must judge the entire buffer contents to
-            // potentially pose a privacy risk.
-            return false;
-        }
-        // Reload the dictionary in case it has changed (e.g., because the user has changed
-        // languages).
-        final Dictionary dictionary = mSuggest.getMainDictionary();
-        if (dictionary == null) {
-            return false;
-        }
-        // Check each word in the buffer.  If any word poses a privacy threat, we cannot upload the
-        // complete buffer contents in detail.
-        final int length = mLogUnits.size();
-        for (int i = 0; i < length; i++) {
-            final LogUnit logUnit = mLogUnits.get(i);
-            final String word = logUnit.getWord();
-            if (word == null) {
-                // Digits outside words are a privacy threat.
-                if (logUnit.hasDigit()) {
-                    return false;
-                }
-            } else {
-                // Words not in the dictionary are a privacy threat.
-                if (!(dictionary.isValidWord(word))) {
-                    return false;
-                }
-            }
-        }
-        // All checks have passed; this buffer's content can be safely uploaded.
-        return true;
-    }
-
-    @Override
-    protected void onShiftOut(LogUnit logUnit) {
-        if (mResearchLog != null) {
-            mResearchLog.publish(logUnit, false /* isIncludingPrivateData */);
-        }
-    }
-}