52 lines
1.5 KiB
Java
52 lines
1.5 KiB
Java
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/*
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* Copyright (C) 2008 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.collect;
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import static com.google.common.base.Preconditions.checkState;
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import com.google.common.annotations.GwtCompatible;
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/**
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* Precondition checks useful in collection implementations.
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*/
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@GwtCompatible
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final class CollectPreconditions {
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static void checkEntryNotNull(Object key, Object value) {
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if (key == null) {
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throw new NullPointerException("null key in entry: null=" + value);
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} else if (value == null) {
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throw new NullPointerException("null value in entry: " + key + "=null");
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}
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}
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static int checkNonnegative(int value, String name) {
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if (value < 0) {
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throw new IllegalArgumentException(name + " cannot be negative but was: " + value);
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}
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return value;
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}
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/**
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* Precondition tester for {@code Iterator.remove()} that throws an exception
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* with a consistent error message.
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*/
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static void checkRemove(boolean canRemove) {
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checkState(canRemove, "no calls to next() since the last call to remove()");
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}
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}
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