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// Copyright 2018 The Bazel Authors. All rights reserved.
//
// 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.google.devtools.build.runfiles;
/**
* Utilities for the other classes in this package.
*
* <p>These functions are implementations of some basic utilities in the Guava library. We
* reimplement these functions instead of depending on Guava, so that the Runfiles library has no
* third-party dependencies, thus any Java project can depend on it without the risk of pulling
* unwanted or conflicting dependencies (for example if the project already depends on Guava, or
* wishes not to depend on it at all).
*/
class Util {
private Util() {}
/** Returns true when {@code s} is null or an empty string. */
public static boolean isNullOrEmpty(String s) {
return s == null || s.isEmpty();
}
/** Throws an {@code IllegalArgumentException} if {@code condition} is false. */
public static void checkArgument(boolean condition) {
checkArgument(condition, null, null);
}
/** Throws an {@code IllegalArgumentException} if {@code condition} is false. */
public static void checkArgument(boolean condition, String error, Object arg1) {
if (!condition) {
if (isNullOrEmpty(error)) {
throw new IllegalArgumentException("argument validation failed");
} else {
throw new IllegalArgumentException(String.format(error, arg1));
}
}
}
}
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