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/*
 * Copyright 2010 Google Inc.
 *
 * 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.googlecode.tcime;

import android.content.Context;
import android.util.Log;

import java.util.concurrent.CountDownLatch;

/**
 * Reads a word-dictionary and provides word-suggestions as a list of characters
 * for the specified input.
 */
public abstract class WordDictionary {

  private final CountDownLatch loading = new CountDownLatch(1);
  private final DictionaryLoader loader;

  protected WordDictionary(
      Context context, int dictionaryId, int approxDictionarySize) {
    loader = new DictionaryLoader(
        context.getResources().openRawResource(dictionaryId),
        approxDictionarySize, loading);
    new Thread(loader).start();
  }

  protected char[][] dictionary() {
    try {
      loading.await();
    } catch (InterruptedException e) {
      Log.e("WordDictionary", "Loading is interrupted: ", e);
    }
    return loader.result();
  }

  /**
   * Returns a string containing words as suggestions for the specified input.
   * 
   * @param input should not be null.
   * @return a concatenated string of characters, or an empty string if there
   *     is no word for that input.
   */
  public abstract String getWords(CharSequence input);
}