2008-09-01 05:13:32 +02:00
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/*
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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 java.math.BigDecimal;
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import java.math.BigInteger;
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/**
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* A class representing a Json primitive value. A primitive value
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* is either a String, a Java primitive, or a Java primitive
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* wrapper type.
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*
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* @author Inderjeet Singh
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*/
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public final class JsonPrimitive extends JsonElement {
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private Object value;
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/**
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* Create a primitive containing a boolean value.
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*
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* @param bool the value to create the primitive with.
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*/
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public JsonPrimitive(Boolean bool) {
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this.value = bool;
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}
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/**
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* Create a primitive containing a {@link Number}.
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*
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* @param number the value to create the primitive with.
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*/
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public JsonPrimitive(Number number) {
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this.value = number;
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}
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/**
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* Create a primitive containing a String value.
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*
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* @param string the value to create the primitive with.
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*/
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public JsonPrimitive(String string) {
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this.value = string;
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}
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/**
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* Create a primitive containing a character. The character is turned into a one character String
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* since Json only supports String.
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*
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* @param c the value to create the primitive with.
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*/
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public JsonPrimitive(Character c) {
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this.value = String.valueOf(c);
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}
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/**
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* Create a primitive containing a character. The character is turned into a one character String
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* since Json only supports String.
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*
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* @param c the value to create the primitive with.
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*/
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public JsonPrimitive(char c) {
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this.value = String.valueOf(c);
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}
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/**
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* Create a primitive using the specified Object. It must be an instance of {@link Number}, a
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* Java primitive type, or a String.
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*
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* @param primitive the value to create the primitive with.
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*/
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JsonPrimitive(Object primitive) {
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setValue(primitive);
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}
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void setValue(Object primitive) {
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if (primitive instanceof Character) {
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// convert characters to strings since in JSON, characters are represented as a single
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// character string
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char c = ((Character)primitive).charValue();
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this.value = String.valueOf(c);
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} else {
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Preconditions.checkArgument(primitive instanceof Number
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|| ObjectNavigator.isPrimitiveOrString(primitive));
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this.value = primitive;
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}
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}
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/**
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* Check whether this primitive contains a boolean value.
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*
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* @return true if this primitive contains a boolean value, false otherwise.
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*/
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public boolean isBoolean() {
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return value instanceof Boolean;
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}
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/**
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* convenience method to get this element as a {@link Boolean}.
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*
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* @return get this element as a {@link Boolean}.
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* @throws ClassCastException if the value contained is not a valid boolean value.
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*/
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@Override
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Boolean getAsBooleanWrapper() {
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return (Boolean) value;
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}
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/**
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* convenience method to get this element as a boolean value.
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*
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* @return get this element as a primitive boolean value.
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* @throws ClassCastException if the value contained is not a valid boolean value.
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*/
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@Override
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public boolean getAsBoolean() {
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2008-11-20 20:40:12 +01:00
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if (isBoolean()) {
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return getAsBooleanWrapper().booleanValue();
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} else {
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return Boolean.parseBoolean(getAsString());
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}
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2008-09-01 05:13:32 +02:00
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}
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/**
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* Check whether this primitive contains a Number.
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*
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* @return true if this primitive contains a Number, false otherwise.
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*/
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public boolean isNumber() {
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return value instanceof Number;
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}
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/**
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* convenience method to get this element as a Number.
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*
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* @return get this element as a Number.
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* @throws ClassCastException if the value contained is not a valid Number.
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*/
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@Override
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public Number getAsNumber() {
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return (Number) value;
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}
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/**
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* Check whether this primitive contains a String value.
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*
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* @return true if this primitive contains a String value, false otherwise.
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*/
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public boolean isString() {
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return value instanceof String;
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}
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/**
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* convenience method to get this element as a String.
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*
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* @return get this element as a String.
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* @throws ClassCastException if the value contained is not a valid String.
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*/
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@Override
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public String getAsString() {
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return (String) value;
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}
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/**
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* convenience method to get this element as a primitive double.
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*
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* @return get this element as a primitive double.
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* @throws ClassCastException if the value contained is not a valid double.
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*/
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@Override
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public double getAsDouble() {
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2008-11-20 20:40:12 +01:00
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if (isNumber()) {
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return getAsNumber().doubleValue();
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} else {
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return Double.parseDouble(getAsString());
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}
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2008-09-01 05:13:32 +02:00
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}
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/**
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* convenience method to get this element as a {@link BigDecimal}.
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*
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* @return get this element as a {@link BigDecimal}.
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* @throws NumberFormatException if the value contained is not a valid {@link BigDecimal}.
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*/
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@Override
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public BigDecimal getAsBigDecimal() {
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if (value instanceof BigDecimal) {
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return (BigDecimal) value;
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} else {
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return new BigDecimal(value.toString());
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}
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}
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/**
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* convenience method to get this element as a {@link BigInteger}.
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*
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* @return get this element as a {@link BigInteger}.
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* @throws NumberFormatException if the value contained is not a valid {@link BigInteger}.
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*/
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@Override
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public BigInteger getAsBigInteger() {
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if (value instanceof BigInteger) {
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return (BigInteger) value;
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} else {
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return new BigInteger(value.toString());
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}
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}
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/**
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* convenience method to get this element as a float.
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*
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* @return get this element as a float.
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* @throws ClassCastException if the value contained is not a valid float.
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*/
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@Override
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public float getAsFloat() {
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if (isNumber()) {
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return getAsNumber().floatValue();
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} else {
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return Float.parseFloat(getAsString());
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}
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2008-09-01 05:13:32 +02:00
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}
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/**
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* convenience method to get this element as a primitive long.
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*
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* @return get this element as a primitive long.
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* @throws ClassCastException if the value contained is not a valid long.
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*/
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@Override
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public long getAsLong() {
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2008-11-20 20:40:12 +01:00
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if (isNumber()) {
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return getAsNumber().longValue();
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} else {
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return Long.parseLong(getAsString());
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}
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2008-09-01 05:13:32 +02:00
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}
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/**
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* convenience method to get this element as a primitive short.
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*
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* @return get this element as a primitive short.
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* @throws ClassCastException if the value contained is not a valid short value.
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*/
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2008-11-20 20:40:12 +01:00
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@Override
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2008-09-01 05:13:32 +02:00
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public short getAsShort() {
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2008-11-20 20:40:12 +01:00
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if (isNumber()) {
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return getAsNumber().shortValue();
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} else {
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return Short.parseShort(getAsString());
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}
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2008-09-01 05:13:32 +02:00
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}
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/**
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* convenience method to get this element as a primitive integer.
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*
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* @return get this element as a primitive integer.
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* @throws ClassCastException if the value contained is not a valid integer.
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*/
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@Override
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public int getAsInt() {
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2008-11-20 20:40:12 +01:00
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if (isNumber()) {
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return getAsNumber().intValue();
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} else {
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return Integer.parseInt(getAsString());
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}
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2008-09-01 05:13:32 +02:00
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}
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2008-11-15 03:26:57 +01:00
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@Override
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public byte getAsByte() {
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2008-11-20 20:40:12 +01:00
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if (isNumber()) {
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return getAsNumber().byteValue();
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} else {
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return Byte.parseByte(getAsString());
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}
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2008-11-15 03:26:57 +01:00
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}
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@Override
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public char getAsCharacter() {
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return getAsString().charAt(0);
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}
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2008-09-01 05:13:32 +02:00
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/**
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* convenience method to get this element as an Object.
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*
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* @return get this element as an Object that can be converted to a suitable value.
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*/
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@Override
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Object getAsObject() {
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return value;
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}
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@Override
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protected void toString(StringBuilder sb) {
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if (value != null) {
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if (value instanceof String) {
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sb.append('"');
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sb.append(value);
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sb.append('"');
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} else {
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sb.append(value);
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}
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}
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}
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}
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