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package org.mozc.android.inputmethod.japanese.mushroom;

import android.util.SparseArray;

/**
 * Simple map object to proxy the result from Mushroom application.
 *
 * Background: MozcService is the {@code Service} instance but Mushroom application is
 * {@code Activity}, and its protocol to tell the result of the activity uses
 * "result" of Activity stack.
 * Thus, we need to tell it to ImeService somehow. Unfortunately, there seems
 * no good way, so we use global map instance for the proxy.
 *
 * This class is a singleton.
 *
 */
public class MushroomResultProxy {
  private static final MushroomResultProxy INSTANCE = new MushroomResultProxy();

  /** A map from fieldId to mushroom result. */
  private final SparseArray<String> replaceKeyMap = new SparseArray<String>();
  private MushroomResultProxy() {
  }

  /**
   * @return the singleton instance of this class.
   */
  public static MushroomResultProxy getInstance() {
    return INSTANCE;
  }

  /**
   * Registers the {@code replaceKey} which should be filled into the field with the given
   * {@fieldId}.
   */
  public void addReplaceKey(int fieldId, String replaceKey) {
    replaceKeyMap.put(fieldId, replaceKey);
  }

  /**
   * @return the String to be filled in the field with the given {@code fieldId} if available.
   *   Otherwise, {@code null}.
   */
  public String getReplaceKey(int fieldId) {
    return replaceKeyMap.get(fieldId);
  }

  /**
   * Clears all the data in the instance.
   */
  public void clear() {
    replaceKeyMap.clear();
  }
}