115 lines
3.0 KiB
Java
115 lines
3.0 KiB
Java
/*
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* Copyright (C) 2018 Google Inc.
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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.gson.internal;
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import java.util.AbstractList;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.List;
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import java.util.Objects;
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import java.util.RandomAccess;
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/**
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* {@link List} which wraps another {@code List} but prevents insertion of
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* {@code null} elements. Methods which only perform checks with the element
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* argument (e.g. {@link #contains(Object)}) do not throw exceptions for
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* {@code null} arguments.
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*/
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public class NonNullElementWrapperList<E> extends AbstractList<E> implements RandomAccess {
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// Explicitly specify ArrayList as type to guarantee that delegate implements RandomAccess
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private final ArrayList<E> delegate;
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public NonNullElementWrapperList(ArrayList<E> delegate) {
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this.delegate = Objects.requireNonNull(delegate);
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}
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@Override public E get(int index) {
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return delegate.get(index);
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}
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@Override public int size() {
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return delegate.size();
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}
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private E nonNull(E element) {
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if (element == null) {
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throw new NullPointerException("Element must be non-null");
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}
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return element;
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}
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@Override public E set(int index, E element) {
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return delegate.set(index, nonNull(element));
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}
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@Override public void add(int index, E element) {
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delegate.add(index, nonNull(element));
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}
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@Override public E remove(int index) {
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return delegate.remove(index);
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}
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/* The following methods are overridden because their default implementation is inefficient */
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@Override public void clear() {
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delegate.clear();
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}
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@Override public boolean remove(Object o) {
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return delegate.remove(o);
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}
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@Override public boolean removeAll(Collection<?> c) {
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return delegate.removeAll(c);
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}
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@Override public boolean retainAll(Collection<?> c) {
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return delegate.retainAll(c);
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}
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@Override public boolean contains(Object o) {
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return delegate.contains(o);
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}
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@Override public int indexOf(Object o) {
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return delegate.indexOf(o);
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}
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@Override public int lastIndexOf(Object o) {
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return delegate.lastIndexOf(o);
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}
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@Override public Object[] toArray() {
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return delegate.toArray();
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}
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@Override public <T> T[] toArray(T[] a) {
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return delegate.toArray(a);
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}
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@Override public boolean equals(Object o) {
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return delegate.equals(o);
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}
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@Override public int hashCode() {
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return delegate.hashCode();
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}
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// TODO: Once Gson targets Java 8 also override List.sort
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}
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