// =================================================================================================
// Copyright 2011 Twitter, Inc.
// -------------------------------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this work except in compliance with the License.
// You may obtain a copy of the License in the LICENSE file, or 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.twitter.common.args.constraints;
import java.lang.annotation.Annotation;
import com.twitter.common.args.Verifier;
import com.twitter.common.args.VerifierFor;
import static com.google.common.base.Preconditions.checkArgument;
/**
* Verifier to ensure that a number is non-negative.
*
* @author William Farner
*/
@VerifierFor(NotNegative.class)
public class NotNegativeNumberVerifier implements Verifier<Number> {
@Override
public void verify(Number number, Annotation annotation) {
checkArgument(number.doubleValue() >= 0, "Value must be non-negative.");
}
@Override
public String toString(Class<? extends Number> argType, Annotation annotation) {
return "must be >= 0";
}
}