org.puder.trs80.ActivityHelper.java Source code

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Here is the source code for org.puder.trs80.ActivityHelper.java

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/*
 * Copyright 2017, Sascha Haeberling
 *
 * 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 org.puder.trs80;

import android.content.Intent;
import android.util.Log;

import com.google.common.base.Optional;

/**
 * Helper for common Activity-related functions.
 */
class ActivityHelper {
    private static final String TAG = "ActivityHelper";

    /**
     * Returns an extra value with the given key, if the intent, the extras and the key itself are
     * present.
     */
    static Optional<Integer> getIntExtra(Intent intent, String key) {
        if (intent == null) {
            Log.i(TAG, "No intent.");
            return Optional.absent();
        }
        if (!intent.hasExtra(key)) {
            Log.i(TAG, StrUtil.form("No extra named '%s'.", key));
            return Optional.absent();
        }
        return Optional.of(intent.getIntExtra(key, 0));
    }
}