KeyComboPersister.java

/*
 * Copyright (C) 2016 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.talkback.keyboard;

import android.content.Context;
import android.content.SharedPreferences;

import com.android.utils.SharedPreferencesUtils;

/**
 * Key value store to make key combo code persistent.
 */
public class KeyComboPersister {
    private static final String PREFIX_CONCATENATOR = "|";

    private SharedPreferences mPrefs;
    private final String mKeyPrefix;

    public KeyComboPersister(Context context, String keyPrefix) {
        mPrefs = SharedPreferencesUtils.getSharedPreferences(context);
        mKeyPrefix = keyPrefix;
    }

    private String getPrefixedKey(String key) {
        if (mKeyPrefix == null) {
            return key;
        } else {
            return mKeyPrefix + PREFIX_CONCATENATOR + key;
        }
    }

    public void saveKeyCombo(String key, long keyComboCode) {
        mPrefs.edit().putLong(getPrefixedKey(key), keyComboCode).apply();
    }

    public boolean contains(String key) {
        return mPrefs.contains(getPrefixedKey(key));
    }

    public Long getKeyComboCode(String key) {
        return mPrefs.getLong(getPrefixedKey(key), KeyComboModel.KEY_COMBO_CODE_UNASSIGNED);
    }
}