Add binary dictionary tests.

/*

 * 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;

import android.test.AndroidTestCase;

import android.test.suitebuilder.annotation.LargeTest;

import com.android.inputmethod.latin.makedict.DictEncoder;

import com.android.inputmethod.latin.makedict.FormatSpec;

import com.android.inputmethod.latin.makedict.FusionDictionary;

import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;

import com.android.inputmethod.latin.makedict.UnsupportedFormatException;

import com.android.inputmethod.latin.makedict.Ver3DictEncoder;

import java.io.File;

import java.io.IOException;

import java.util.HashMap;

import java.util.Locale;

@LargeTest

public class BinaryDictionaryTests extends AndroidTestCase {

    private static final FormatSpec.FormatOptions FORMAT_OPTIONS =

            new FormatSpec.FormatOptions(3 /* version */, true /* supportsDynamicUpdate */);

    private static final String TEST_DICT_FILE_EXTENSION = ".testDict";

    private static final String TEST_LOCALE = "test";

    @Override

    protected void setUp() throws Exception {

        super.setUp();

    }

    @Override

    protected void tearDown() throws Exception {

        super.tearDown();

    }

    private File createEmptyDictionaryAndGetFile(final String filename) throws IOException,

            UnsupportedFormatException {

        final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),

                new FusionDictionary.DictionaryOptions(new HashMap<String,String>(), false, false));

        final File file = File.createTempFile(filename, TEST_DICT_FILE_EXTENSION,

                getContext().getCacheDir());

        final DictEncoder dictEncoder = new Ver3DictEncoder(file);

        dictEncoder.writeDictionary(dict, FORMAT_OPTIONS);

        return file;

    }

    public void testIsValidDictionary() {

        File dictFile = null;

        try {

            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");

        } catch (IOException e) {

            fail("IOException while writing an initial dictionary : " + e);

        } catch (UnsupportedFormatException e) {

            fail("UnsupportedFormatException while writing an initial dictionary : " + e);

        }

        BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),

                0 /* offset */, dictFile.length(), true /* useFullEditDistance */,

                Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);

        assertTrue("binaryDictionary must be valid for existing valid dictionary file.",

                binaryDictionary.isValidDictionary());

        binaryDictionary.close();

        assertFalse("binaryDictionary must be invalid after closing.",

                binaryDictionary.isValidDictionary());

        dictFile.delete();

        binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(), 0 /* offset */,

                dictFile.length(), true /* useFullEditDistance */, Locale.getDefault(),

                TEST_LOCALE, true /* isUpdatable */);

        assertFalse("binaryDictionary must be invalid for not existing dictionary file.",

                binaryDictionary.isValidDictionary());

        binaryDictionary.close();

    }

}