/*
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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 cn.emay.sdk.util.json.gson;
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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
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* {@link JsonElement}s each of which can be of a different type. This is an
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* ordered list, meaning that the order in which elements are added is
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* preserved.
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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 List<JsonElement> elements;
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/**
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* Creates an empty JsonArray.
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*/
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public JsonArray() {
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elements = new ArrayList<JsonElement>();
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}
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@Override
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JsonArray deepCopy() {
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JsonArray result = new JsonArray();
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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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/**
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* Adds the specified boolean to self.
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*
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* @param bool
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* the boolean that needs to be added to the array.
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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
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* the character that needs to be added to the array.
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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
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* the number that needs to be added to the array.
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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
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* the string that needs to be added to the array.
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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
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* 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
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* 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
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* specified element. Element can be null.
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*
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* @param index
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* index of the element to replace
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* @param element
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* 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
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* 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);
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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
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* is present. If the array does not contain the element, it is unchanged.
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*
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* @param element
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* 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
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* subsequent elements to the left (subtracts one from their indices). Returns
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* the element that was removed from the array.
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*
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* @param index
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* 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
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* 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
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* 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 an iterator to navigate the elements of the array. Since the array is
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* an ordered list, the iterator navigates the elements in the order they were
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* 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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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 ith element of the array.
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*
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* @param i
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* the index of the element that is being sought.
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* @return the element present at the ith index.
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* @throws IndexOutOfBoundsException
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* if i is negative or greater than or equal to the {@link #size()}
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* 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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/**
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* convenience method to get this array as a {@link Number} if it contains a
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* single element.
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*
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* @return get this element as a number if it is single element array.
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* @throws ClassCastException
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* if the element in the array is of not a {@link JsonPrimitive} and
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* is not a valid Number.
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* @throws IllegalStateException
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* if the array 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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if (elements.size() == 1) {
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return elements.get(0).getAsNumber();
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}
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throw new IllegalStateException();
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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
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* single element.
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*
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* @return get this element as a String if it is single element array.
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* @throws ClassCastException
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* if the element in the array is of not a {@link JsonPrimitive} and
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* is not a valid String.
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* @throws IllegalStateException
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* if the array 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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if (elements.size() == 1) {
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return elements.get(0).getAsString();
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}
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throw new IllegalStateException();
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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
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* element.
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*
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* @return get this element as a double if it is single element array.
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* @throws ClassCastException
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* if the element in the array is of not a {@link JsonPrimitive} and
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* is not a valid double.
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* @throws IllegalStateException
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* if the array 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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if (elements.size() == 1) {
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return elements.get(0).getAsDouble();
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}
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throw new IllegalStateException();
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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
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* single element.
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*
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* @return get this element as a {@link BigDecimal} if it is single element
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* array.
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* @throws ClassCastException
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* if the element in the array is of not a {@link JsonPrimitive}.
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* @throws NumberFormatException
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* if the element at index 0 is not a valid {@link BigDecimal}.
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* @throws IllegalStateException
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* if the array 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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if (elements.size() == 1) {
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return elements.get(0).getAsBigDecimal();
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}
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throw new IllegalStateException();
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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
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* single element.
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*
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* @return get this element as a {@link BigInteger} if it is single element
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* array.
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* @throws ClassCastException
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* if the element in the array is of not a {@link JsonPrimitive}.
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* @throws NumberFormatException
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* if the element at index 0 is not a valid {@link BigInteger}.
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* @throws IllegalStateException
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* if the array 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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if (elements.size() == 1) {
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return elements.get(0).getAsBigInteger();
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}
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throw new IllegalStateException();
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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
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* element.
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*
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* @return get this element as a float if it is single element array.
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* @throws ClassCastException
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* if the element in the array is of not a {@link JsonPrimitive} and
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* is not a valid float.
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* @throws IllegalStateException
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* if the array 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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if (elements.size() == 1) {
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return elements.get(0).getAsFloat();
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}
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throw new IllegalStateException();
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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
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* element.
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*
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* @return get this element as a long if it is single element array.
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* @throws ClassCastException
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* if the element in the array is of not a {@link JsonPrimitive} and
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* is not a valid long.
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* @throws IllegalStateException
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* if the array 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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if (elements.size() == 1) {
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return elements.get(0).getAsLong();
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}
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throw new IllegalStateException();
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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
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* element.
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*
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* @return get this element as an integer if it is single element array.
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* @throws ClassCastException
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* if the element in the array is of not a {@link JsonPrimitive} and
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* is not a valid integer.
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* @throws IllegalStateException
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* if the array 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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if (elements.size() == 1) {
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return elements.get(0).getAsInt();
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}
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throw new IllegalStateException();
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}
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@Override
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public byte getAsByte() {
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if (elements.size() == 1) {
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return elements.get(0).getAsByte();
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}
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throw new IllegalStateException();
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}
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@Override
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public char getAsCharacter() {
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if (elements.size() == 1) {
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return elements.get(0).getAsCharacter();
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}
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throw new IllegalStateException();
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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
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* single element.
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*
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* @return get this element as a primitive short if it is single element array.
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* @throws ClassCastException
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* if the element in the array is of not a {@link JsonPrimitive} and
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* is not a valid short.
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* @throws IllegalStateException
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* if the array 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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if (elements.size() == 1) {
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return elements.get(0).getAsShort();
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}
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throw new IllegalStateException();
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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
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* element.
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*
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* @return get this element as a boolean if it is single element array.
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* @throws ClassCastException
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* if the element in the array is of not a {@link JsonPrimitive} and
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* is not a valid boolean.
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* @throws IllegalStateException
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* if the array 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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if (elements.size() == 1) {
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return elements.get(0).getAsBoolean();
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}
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throw new IllegalStateException();
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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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@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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