434 lines
14 KiB
Java
434 lines
14 KiB
Java
/*
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* Copyright (C) 2008 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;
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import com.google.gson.internal.NonNullElementWrapperList;
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import java.math.BigDecimal;
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import java.math.BigInteger;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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/**
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* A class representing an array type in JSON. An array is a list of {@link JsonElement}s each of
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* which can be of a different type. This is an ordered list, meaning that the order in which
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* elements are added is preserved. This class does not support {@code null} values. If {@code null}
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* is provided as element argument to any of the methods, it is converted to a {@link JsonNull}.
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*
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* <p>{@code JsonArray} only implements the {@link Iterable} interface but not the {@link List}
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* interface. A {@code List} view of it can be obtained with {@link #asList()}.
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*
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* @author Inderjeet Singh
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* @author Joel Leitch
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*/
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public final class JsonArray extends JsonElement implements Iterable<JsonElement> {
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private final ArrayList<JsonElement> elements;
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/**
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* Creates an empty JsonArray.
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*/
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@SuppressWarnings("deprecation") // superclass constructor
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public JsonArray() {
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elements = new ArrayList<>();
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}
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/**
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* Creates an empty JsonArray with the desired initial capacity.
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*
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* @param capacity initial capacity.
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* @throws IllegalArgumentException if the {@code capacity} is
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* negative
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* @since 2.8.1
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*/
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@SuppressWarnings("deprecation") // superclass constructor
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public JsonArray(int capacity) {
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elements = new ArrayList<>(capacity);
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}
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/**
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* Creates a deep copy of this element and all its children.
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*
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* @since 2.8.2
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*/
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@Override
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public JsonArray deepCopy() {
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if (!elements.isEmpty()) {
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JsonArray result = new JsonArray(elements.size());
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for (JsonElement element : elements) {
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result.add(element.deepCopy());
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}
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return result;
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}
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return new JsonArray();
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}
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/**
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* Adds the specified boolean to self.
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*
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* @param bool the boolean that needs to be added to the array.
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* @since 2.4
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*/
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public void add(Boolean bool) {
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elements.add(bool == null ? JsonNull.INSTANCE : new JsonPrimitive(bool));
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}
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/**
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* Adds the specified character to self.
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*
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* @param character the character that needs to be added to the array.
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* @since 2.4
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*/
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public void add(Character character) {
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elements.add(character == null ? JsonNull.INSTANCE : new JsonPrimitive(character));
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}
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/**
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* Adds the specified number to self.
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*
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* @param number the number that needs to be added to the array.
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* @since 2.4
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*/
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public void add(Number number) {
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elements.add(number == null ? JsonNull.INSTANCE : new JsonPrimitive(number));
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}
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/**
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* Adds the specified string to self.
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*
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* @param string the string that needs to be added to the array.
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* @since 2.4
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*/
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public void add(String string) {
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elements.add(string == null ? JsonNull.INSTANCE : new JsonPrimitive(string));
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}
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/**
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* Adds the specified element to self.
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*
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* @param element the element that needs to be added to the array.
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*/
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public void add(JsonElement element) {
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if (element == null) {
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element = JsonNull.INSTANCE;
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}
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elements.add(element);
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}
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/**
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* Adds all the elements of the specified array to self.
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*
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* @param array the array whose elements need to be added to the array.
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*/
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public void addAll(JsonArray array) {
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elements.addAll(array.elements);
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}
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/**
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* Replaces the element at the specified position in this array with the specified element.
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*
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* @param index index of the element to replace
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* @param element element to be stored at the specified position
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* @return the element previously at the specified position
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* @throws IndexOutOfBoundsException if the specified index is outside the array bounds
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*/
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public JsonElement set(int index, JsonElement element) {
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return elements.set(index, element == null ? JsonNull.INSTANCE : element);
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}
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/**
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* Removes the first occurrence of the specified element from this array, if it is present.
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* If the array does not contain the element, it is unchanged.
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*
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* @param element element to be removed from this array, if present
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* @return true if this array contained the specified element, false otherwise
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* @since 2.3
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*/
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public boolean remove(JsonElement element) {
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return elements.remove(element);
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}
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/**
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* Removes the element at the specified position in this array. Shifts any subsequent elements
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* to the left (subtracts one from their indices). Returns the element that was removed from
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* the array.
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*
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* @param index index the index of the element to be removed
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* @return the element previously at the specified position
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* @throws IndexOutOfBoundsException if the specified index is outside the array bounds
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* @since 2.3
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*/
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public JsonElement remove(int index) {
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return elements.remove(index);
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}
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/**
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* Returns true if this array contains the specified element.
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*
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* @return true if this array contains the specified element.
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* @param element whose presence in this array is to be tested
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* @since 2.3
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*/
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public boolean contains(JsonElement element) {
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return elements.contains(element);
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}
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/**
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* Returns the number of elements in the array.
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*
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* @return the number of elements in the array.
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*/
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public int size() {
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return elements.size();
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}
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/**
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* Returns true if the array is empty.
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*
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* @return true if the array is empty.
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* @since 2.8.7
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*/
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public boolean isEmpty() {
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return elements.isEmpty();
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}
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/**
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* Returns an iterator to navigate the elements of the array. Since the array is an ordered list,
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* the iterator navigates the elements in the order they were inserted.
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*
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* @return an iterator to navigate the elements of the array.
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*/
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@Override
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public Iterator<JsonElement> iterator() {
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return elements.iterator();
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}
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/**
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* Returns the i-th element of the array.
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*
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* @param i the index of the element that is being sought.
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* @return the element present at the i-th index.
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* @throws IndexOutOfBoundsException if i is negative or greater than or equal to the
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* {@link #size()} of the array.
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*/
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public JsonElement get(int i) {
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return elements.get(i);
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}
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private JsonElement getAsSingleElement() {
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int size = elements.size();
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if (size == 1) {
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return elements.get(0);
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}
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throw new IllegalStateException("Array must have size 1, but has size " + size);
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}
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/**
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* Convenience method to get this array as a {@link Number} if it contains a single element.
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* This method calls {@link JsonElement#getAsNumber()} on the element, therefore any
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* of the exceptions declared by that method can occur.
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*
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* @return this element as a number if it is single element array.
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* @throws IllegalStateException if the array is empty or has more than one element.
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*/
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@Override
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public Number getAsNumber() {
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return getAsSingleElement().getAsNumber();
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}
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/**
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* Convenience method to get this array as a {@link String} if it contains a single element.
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* This method calls {@link JsonElement#getAsString()} on the element, therefore any
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* of the exceptions declared by that method can occur.
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*
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* @return this element as a String if it is single element array.
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* @throws IllegalStateException if the array is empty or has more than one element.
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*/
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@Override
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public String getAsString() {
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return getAsSingleElement().getAsString();
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}
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/**
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* Convenience method to get this array as a double if it contains a single element.
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* This method calls {@link JsonElement#getAsDouble()} on the element, therefore any
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* of the exceptions declared by that method can occur.
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*
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* @return this element as a double if it is single element array.
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* @throws IllegalStateException if the array is empty or has more than one element.
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*/
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@Override
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public double getAsDouble() {
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return getAsSingleElement().getAsDouble();
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}
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/**
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* Convenience method to get this array as a {@link BigDecimal} if it contains a single element.
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* This method calls {@link JsonElement#getAsBigDecimal()} on the element, therefore any
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* of the exceptions declared by that method can occur.
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*
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* @return this element as a {@link BigDecimal} if it is single element array.
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* @throws IllegalStateException if the array is empty or has more than one element.
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* @since 1.2
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*/
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@Override
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public BigDecimal getAsBigDecimal() {
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return getAsSingleElement().getAsBigDecimal();
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}
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/**
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* Convenience method to get this array as a {@link BigInteger} if it contains a single element.
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* This method calls {@link JsonElement#getAsBigInteger()} on the element, therefore any
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* of the exceptions declared by that method can occur.
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*
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* @return this element as a {@link BigInteger} if it is single element array.
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* @throws IllegalStateException if the array is empty or has more than one element.
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* @since 1.2
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*/
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@Override
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public BigInteger getAsBigInteger() {
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return getAsSingleElement().getAsBigInteger();
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}
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/**
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* Convenience method to get this array as a float if it contains a single element.
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* This method calls {@link JsonElement#getAsFloat()} on the element, therefore any
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* of the exceptions declared by that method can occur.
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*
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* @return this element as a float if it is single element array.
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* @throws IllegalStateException if the array is empty or has more than one element.
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*/
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@Override
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public float getAsFloat() {
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return getAsSingleElement().getAsFloat();
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}
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/**
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* Convenience method to get this array as a long if it contains a single element.
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* This method calls {@link JsonElement#getAsLong()} on the element, therefore any
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* of the exceptions declared by that method can occur.
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*
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* @return this element as a long if it is single element array.
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* @throws IllegalStateException if the array is empty or has more than one element.
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*/
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@Override
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public long getAsLong() {
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return getAsSingleElement().getAsLong();
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}
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/**
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* Convenience method to get this array as an integer if it contains a single element.
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* This method calls {@link JsonElement#getAsInt()} on the element, therefore any
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* of the exceptions declared by that method can occur.
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*
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* @return this element as an integer if it is single element array.
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* @throws IllegalStateException if the array is empty or has more than one element.
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*/
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@Override
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public int getAsInt() {
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return getAsSingleElement().getAsInt();
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}
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/**
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* Convenience method to get this array as a primitive byte if it contains a single element.
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* This method calls {@link JsonElement#getAsByte()} on the element, therefore any
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* of the exceptions declared by that method can occur.
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*
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* @return this element as a primitive byte if it is single element array.
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* @throws IllegalStateException if the array is empty or has more than one element.
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*/
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@Override
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public byte getAsByte() {
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return getAsSingleElement().getAsByte();
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}
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/**
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* Convenience method to get this array as a character if it contains a single element.
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* This method calls {@link JsonElement#getAsCharacter()} on the element, therefore any
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* of the exceptions declared by that method can occur.
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*
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* @return this element as a primitive short if it is single element array.
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* @throws IllegalStateException if the array is empty or has more than one element.
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* @deprecated This method is misleading, as it does not get this element as a char but rather as
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* a string's first character.
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*/
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@Deprecated
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@Override
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public char getAsCharacter() {
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return getAsSingleElement().getAsCharacter();
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}
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/**
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* Convenience method to get this array as a primitive short if it contains a single element.
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* This method calls {@link JsonElement#getAsShort()} on the element, therefore any
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* of the exceptions declared by that method can occur.
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*
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* @return this element as a primitive short if it is single element array.
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* @throws IllegalStateException if the array is empty or has more than one element.
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*/
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@Override
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public short getAsShort() {
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return getAsSingleElement().getAsShort();
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}
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/**
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* Convenience method to get this array as a boolean if it contains a single element.
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* This method calls {@link JsonElement#getAsBoolean()} on the element, therefore any
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* of the exceptions declared by that method can occur.
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*
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* @return this element as a boolean if it is single element array.
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* @throws IllegalStateException if the array is empty or has more than one element.
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*/
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@Override
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public boolean getAsBoolean() {
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return getAsSingleElement().getAsBoolean();
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}
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/**
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* Returns a mutable {@link List} view of this {@code JsonArray}. Changes to the {@code List}
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* are visible in this {@code JsonArray} and the other way around.
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*
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* <p>The {@code List} does not permit {@code null} elements. Unlike {@code JsonArray}'s
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* {@code null} handling, a {@link NullPointerException} is thrown when trying to add {@code null}.
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* Use {@link JsonNull} for JSON null values.
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*
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* @return mutable {@code List} view
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* @since $next-version$
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*/
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public List<JsonElement> asList() {
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return new NonNullElementWrapperList<>(elements);
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}
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/**
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* Returns whether the other object is equal to this. This method only considers
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* the other object to be equal if it is an instance of {@code JsonArray} and has
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* equal elements in the same order.
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*/
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@Override
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public boolean equals(Object o) {
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return (o == this) || (o instanceof JsonArray && ((JsonArray) o).elements.equals(elements));
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}
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/**
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* Returns the hash code of this array. This method calculates the hash code based
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* on the elements of this array.
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*/
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@Override
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public int hashCode() {
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return elements.hashCode();
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}
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}
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