com.google.common.collect.CollectPreconditions Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* Copyright (C) 2008 The Guava Authors
*
* 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.common.collect;
import static com.google.common.base.Preconditions.checkState;
import com.google.common.annotations.GwtCompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
/** Precondition checks useful in collection implementations. */
@GwtCompatible
@ElementTypesAreNonnullByDefault
final class CollectPreconditions {
static void checkEntryNotNull(Object key, Object value) {
if (key == null) {
throw new NullPointerException("null key in entry: null=" + value);
} else if (value == null) {
throw new NullPointerException("null value in entry: " + key + "=null");
}
}
@CanIgnoreReturnValue
static int checkNonnegative(int value, String name) {
if (value < 0) {
throw new IllegalArgumentException(name + " cannot be negative but was: " + value);
}
return value;
}
@CanIgnoreReturnValue
static long checkNonnegative(long value, String name) {
if (value < 0) {
throw new IllegalArgumentException(name + " cannot be negative but was: " + value);
}
return value;
}
static void checkPositive(int value, String name) {
if (value <= 0) {
throw new IllegalArgumentException(name + " must be positive but was: " + value);
}
}
/**
* Precondition tester for {@code Iterator.remove()} that throws an exception with a consistent
* error message.
*/
static void checkRemove(boolean canRemove) {
checkState(canRemove, "no calls to next() since the last call to remove()");
}
}