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// Copyright 2014 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.lib.packages;
/**
* A helper class for PredicateWithMessage with default predicates.
*/
public abstract class PredicatesWithMessage implements PredicateWithMessage<Object> {
private static final PredicateWithMessage<?> ALWAYS_TRUE = new PredicateWithMessage<Object>() {
@Override
public boolean apply(Object input) {
return true;
}
@Override
public String getErrorReason(Object param) {
throw new UnsupportedOperationException();
}
};
@SuppressWarnings("unchecked")
public static <T> PredicateWithMessage<T> alwaysTrue() {
return (PredicateWithMessage<T>) ALWAYS_TRUE;
}
}
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