documents-archive/src/android/support/provider/Preconditions.java

/*
 * Copyright (C) 2015 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 android.support.provider;

import android.support.annotation.Nullable;
import android.text.TextUtils;

import java.util.Collection;

/**
 * Simple static methods to be called at the start of your own methods to verify
 * correct arguments and state.
 * @hide
 */
final class Preconditions {
    static void checkArgument(boolean expression, String message) {
        if (!expression) {
            throw new IllegalArgumentException(message);
        }
    }

    static void checkArgumentNotNull(Object object, String message) {
        if (object == null) {
            throw new IllegalArgumentException(message);
        }
    }

    static void checkArgumentEquals(String expected, @Nullable String actual, String message) {
        if (!TextUtils.equals(expected, actual)) {
            throw new IllegalArgumentException(String.format(message, String.valueOf(expected),
                    String.valueOf(actual)));
        }
    }

    static void checkState(boolean expression, String message) {
        if (!expression) {
            throw new IllegalStateException(message);
        }
    }
}