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/*
* Copyright (C) 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.gson;
import com.google.gson.internal.$Gson$Preconditions;
import java.math.BigDecimal;
import java.math.BigInteger;
import com.google.gson.internal.LazilyParsedNumber;
/**
* A class representing a Json primitive value. A primitive value
* is either a String, a Java primitive, or a Java primitive
* wrapper type.
*
* @author Inderjeet Singh
* @author Joel Leitch
*/
public final class JsonPrimitive extends JsonElement {
private final Object value;
/**
* Create a primitive containing a boolean value.
*
* @param bool the value to create the primitive with.
*/
public JsonPrimitive(Boolean bool) {
value = $Gson$Preconditions.checkNotNull(bool);
}
/**
* Create a primitive containing a {@link Number}.
*
* @param number the value to create the primitive with.
*/
public JsonPrimitive(Number number) {
value = $Gson$Preconditions.checkNotNull(number);
}
/**
* Create a primitive containing a String value.
*
* @param string the value to create the primitive with.
*/
public JsonPrimitive(String string) {
value = $Gson$Preconditions.checkNotNull(string);
}
/**
* Create a primitive containing a character. The character is turned into a one character String
* since Json only supports String.
*
* @param c the value to create the primitive with.
*/
public JsonPrimitive(Character c) {
// convert characters to strings since in JSON, characters are represented as a single
// character string
value = $Gson$Preconditions.checkNotNull(c).toString();
}
/**
* Returns the same value as primitives are immutable.
* @since 2.8.2
*/
@Override
public JsonPrimitive deepCopy() {
return this;
}
/**
* Check whether this primitive contains a boolean value.
*
* @return true if this primitive contains a boolean value, false otherwise.
*/
public boolean isBoolean() {
return value instanceof Boolean;
}
/**
* convenience method to get this element as a boolean value.
*
* @return get this element as a primitive boolean value.
*/
@Override
public boolean getAsBoolean() {
if (isBoolean()) {
return ((Boolean) value).booleanValue();
}
// Check to see if the value as a String is "true" in any case.
return Boolean.parseBoolean(getAsString());
}
/**
* Check whether this primitive contains a Number.
*
* @return true if this primitive contains a Number, false otherwise.
*/
public boolean isNumber() {
return value instanceof Number;
}
/**
* convenience method to get this element as a Number.
*
* @return get this element as a Number.
* @throws NumberFormatException if the value contained is not a valid Number.
*/
@Override
public Number getAsNumber() {
return value instanceof String ? new LazilyParsedNumber((String) value) : (Number) value;
}
/**
* Check whether this primitive contains a String value.
*
* @return true if this primitive contains a String value, false otherwise.
*/
public boolean isString() {
return value instanceof String;
}
/**
* convenience method to get this element as a String.
*
* @return get this element as a String.
*/
@Override
public String getAsString() {
if (isNumber()) {
return getAsNumber().toString();
} else if (isBoolean()) {
return ((Boolean) value).toString();
} else {
return (String) value;
}
}
/**
* convenience method to get this element as a primitive double.
*
* @return get this element as a primitive double.
* @throws NumberFormatException if the value contained is not a valid double.
*/
@Override
public double getAsDouble() {
return isNumber() ? getAsNumber().doubleValue() : Double.parseDouble(getAsString());
}
/**
* convenience method to get this element as a {@link BigDecimal}.
*
* @return get this element as a {@link BigDecimal}.
* @throws NumberFormatException if the value contained is not a valid {@link BigDecimal}.
*/
@Override
public BigDecimal getAsBigDecimal() {
return value instanceof BigDecimal ? (BigDecimal) value : new BigDecimal(value.toString());
}
/**
* convenience method to get this element as a {@link BigInteger}.
*
* @return get this element as a {@link BigInteger}.
* @throws NumberFormatException if the value contained is not a valid {@link BigInteger}.
*/
@Override
public BigInteger getAsBigInteger() {
return value instanceof BigInteger ?
(BigInteger) value : new BigInteger(value.toString());
}
/**
* convenience method to get this element as a float.
*
* @return get this element as a float.
* @throws NumberFormatException if the value contained is not a valid float.
*/
@Override
public float getAsFloat() {
return isNumber() ? getAsNumber().floatValue() : Float.parseFloat(getAsString());
}
/**
* convenience method to get this element as a primitive long.
*
* @return get this element as a primitive long.
* @throws NumberFormatException if the value contained is not a valid long.
*/
@Override
public long getAsLong() {
return isNumber() ? getAsNumber().longValue() : Long.parseLong(getAsString());
}
/**
* convenience method to get this element as a primitive short.
*
* @return get this element as a primitive short.
* @throws NumberFormatException if the value contained is not a valid short value.
*/
@Override
public short getAsShort() {
return isNumber() ? getAsNumber().shortValue() : Short.parseShort(getAsString());
}
/**
* convenience method to get this element as a primitive integer.
*
* @return get this element as a primitive integer.
* @throws NumberFormatException if the value contained is not a valid integer.
*/
@Override
public int getAsInt() {
return isNumber() ? getAsNumber().intValue() : Integer.parseInt(getAsString());
}
@Override
public byte getAsByte() {
return isNumber() ? getAsNumber().byteValue() : Byte.parseByte(getAsString());
}
@Override
public char getAsCharacter() {
return getAsString().charAt(0);
}
@Override
public int hashCode() {
if (value == null) {
return 31;
}
// Using recommended hashing algorithm from Effective Java for longs and doubles
if (isIntegral(this)) {
long value = getAsNumber().longValue();
return (int) (value ^ (value >>> 32));
}
if (value instanceof Number) {
long value = Double.doubleToLongBits(getAsNumber().doubleValue());
return (int) (value ^ (value >>> 32));
}
return value.hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
JsonPrimitive other = (JsonPrimitive)obj;
if (value == null) {
return other.value == null;
}
if (isIntegral(this) && isIntegral(other)) {
return getAsNumber().longValue() == other.getAsNumber().longValue();
}
if (value instanceof Number && other.value instanceof Number) {
double a = getAsNumber().doubleValue();
// Java standard types other than double return true for two NaN. So, need
// special handling for double.
double b = other.getAsNumber().doubleValue();
return a == b || (Double.isNaN(a) && Double.isNaN(b));
}
return value.equals(other.value);
}
/**
* Returns true if the specified number is an integral type
* (Long, Integer, Short, Byte, BigInteger)
*/
private static boolean isIntegral(JsonPrimitive primitive) {
if (primitive.value instanceof Number) {
Number number = (Number) primitive.value;
return number instanceof BigInteger || number instanceof Long || number instanceof Integer
|| number instanceof Short || number instanceof Byte;
}
return false;
}
}
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