/*
* Copyright (C) 2017 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.app.timezone;
/**
* Shared code for android.app.timezone classes.
*/
final class Utils {
private Utils() {}
static int validateVersion(String type, int version) {
if (version < 0 || version > 999) {
throw new IllegalArgumentException("Invalid " + type + " version=" + version);
}
return version;
}
static String validateRulesVersion(String type, String rulesVersion) {
validateNotNull(type, rulesVersion);
if (rulesVersion.isEmpty()) {
throw new IllegalArgumentException(type + " must not be empty");
}
return rulesVersion;
}
/** Validates that {@code object} is not null. Always returns {@code object}. */
static <T> T validateNotNull(String type, T object) {
if (object == null) {
throw new NullPointerException(type + " == null");
}
return object;
}
/**
* If {@code requireNotNull} is {@code true} calls {@link #validateNotNull(String, Object)},
* and {@link #validateNull(String, Object)} otherwise. Returns {@code object}.
*/
static <T> T validateConditionalNull(boolean requireNotNull, String type, T object) {
if (requireNotNull) {
return validateNotNull(type, object);
} else {
return validateNull(type, object);
}
}
/** Validates that {@code object} is null. Always returns null. */
static <T> T validateNull(String type, T object) {
if (object != null) {
throw new IllegalArgumentException(type + " != null");
}
return null;
}
}