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JSONArray.java
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package org.json;
/*
Copyright (c) 2002 JSON.org
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
The Software shall be used for Good, not Evil.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Array;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* A JSONArray is an ordered sequence of values. Its external text form is a
* string wrapped in square brackets with commas separating the values. The
* internal form is an object having <code>get</code> and <code>opt</code>
* methods for accessing the values by index, and <code>put</code> methods for
* adding or replacing values. The values can be any of these types:
* <code>Boolean</code>, <code>JSONArray</code>, <code>JSONObject</code>,
* <code>Number</code>, <code>String</code>, or the
* <code>JSONObject.NULL object</code>.
* <p>
* The constructor can convert a JSON text into a Java object. The
* <code>toString</code> method converts to JSON text.
* <p>
* A <code>get</code> method returns a value if one can be found, and throws an
* exception if one cannot be found. An <code>opt</code> method returns a
* default value instead of throwing an exception, and so is useful for
* obtaining optional values.
* <p>
* The generic <code>get()</code> and <code>opt()</code> methods return an
* object which you can cast or query for type. There are also typed
* <code>get</code> and <code>opt</code> methods that do type checking and type
* coercion for you.
* <p>
* The texts produced by the <code>toString</code> methods strictly conform to
* JSON syntax rules. The constructors are more forgiving in the texts they will
* accept:
* <ul>
* <li>An extra <code>,</code> <small>(comma)</small> may appear just
* before the closing bracket.</li>
* <li>The <code>null</code> value will be inserted when there is <code>,</code>
* <small>(comma)</small> elision.</li>
* <li>Strings may be quoted with <code>'</code> <small>(single
* quote)</small>.</li>
* <li>Strings do not need to be quoted at all if they do not begin with a quote
* or single quote, and if they do not contain leading or trailing spaces, and
* if they do not contain any of these characters:
* <code>{ } [ ] / \ : , #</code> and if they do not look like numbers and
* if they are not the reserved words <code>true</code>, <code>false</code>, or
* <code>null</code>.</li>
* </ul>
*
* @author JSON.org
* @version 2016-08/15
*/
public class JSONArray implements Iterable<Object> {
/**
* The arrayList where the JSONArray's properties are kept.
*/
private final ArrayList<Object> myArrayList;
/**
* Construct an empty JSONArray.
*/
public JSONArray() {
this.myArrayList = new ArrayList<Object>();
}
/**
* Construct a JSONArray from a JSONTokener.
*
* @param x
* A JSONTokener
* @throws JSONException
* If there is a syntax error.
*/
public JSONArray(JSONTokener x) throws JSONException {
this();
if (x.nextClean() != '[') {
throw x.syntaxError("A JSONArray text must start with '['");
}
char nextChar = x.nextClean();
if (nextChar == 0) {
// array is unclosed. No ']' found, instead EOF
throw x.syntaxError("Expected a ',' or ']'");
}
if (nextChar != ']') {
x.back();
for (;;) {
if (x.nextClean() == ',') {
x.back();
this.myArrayList.add(JSONObject.NULL);
} else {
x.back();
this.myArrayList.add(x.nextValue());
}
switch (x.nextClean()) {
case 0:
// array is unclosed. No ']' found, instead EOF
throw x.syntaxError("Expected a ',' or ']'");
case ',':
nextChar = x.nextClean();
if (nextChar == 0) {
// array is unclosed. No ']' found, instead EOF
throw x.syntaxError("Expected a ',' or ']'");
}
if (nextChar == ']') {
return;
}
x.back();
break;
case ']':
return;
default:
throw x.syntaxError("Expected a ',' or ']'");
}
}
}
}
/**
* Construct a JSONArray from a source JSON text.
*
* @param source
* A string that begins with <code>[</code> <small>(left
* bracket)</small> and ends with <code>]</code>
* <small>(right bracket)</small>.
* @throws JSONException
* If there is a syntax error.
*/
public JSONArray(String source) throws JSONException {
this(new JSONTokener(source));
}
/**
* Construct a JSONArray from a Collection.
*
* @param collection
* A Collection.
*/
public JSONArray(Collection<?> collection) {
if (collection == null) {
this.myArrayList = new ArrayList<Object>();
} else {
this.myArrayList = new ArrayList<Object>(collection.size());
this.addAll(collection, true);
}
}
/**
* Construct a JSONArray from an Iterable. This is a shallow copy.
*
* @param iter
* A Iterable collection.
*/
public JSONArray(Iterable<?> iter) {
this();
if (iter == null) {
return;
}
this.addAll(iter, true);
}
/**
* Construct a JSONArray from another JSONArray. This is a shallow copy.
*
* @param array
* A array.
*/
public JSONArray(JSONArray array) {
if (array == null) {
this.myArrayList = new ArrayList<Object>();
} else {
// shallow copy directly the internal array lists as any wrapping
// should have been done already in the original JSONArray
this.myArrayList = new ArrayList<Object>(array.myArrayList);
}
}
/**
* Construct a JSONArray from an array.
*
* @param array
* Array. If the parameter passed is null, or not an array, an
* exception will be thrown.
*
* @throws JSONException
* If not an array or if an array value is non-finite number.
* @throws NullPointerException
* Thrown if the array parameter is null.
*/
public JSONArray(Object array) throws JSONException {
this();
if (!array.getClass().isArray()) {
throw new JSONException(
"JSONArray initial value should be a string or collection or array.");
}
this.addAll(array, true);
}
/**
* Construct a JSONArray with the specified initial capacity.
*
* @param initialCapacity
* the initial capacity of the JSONArray.
* @throws JSONException
* If the initial capacity is negative.
*/
public JSONArray(int initialCapacity) throws JSONException {
if (initialCapacity < 0) {
throw new JSONException(
"JSONArray initial capacity cannot be negative.");
}
this.myArrayList = new ArrayList<Object>(initialCapacity);
}
@Override
public Iterator<Object> iterator() {
return this.myArrayList.iterator();
}
/**
* Get the object value associated with an index.
*
* @param index
* The index must be between 0 and length() - 1.
* @return An object value.
* @throws JSONException
* If there is no value for the index.
*/
public Object get(int index) throws JSONException {
if (index < 0 || index >= length()) {
throw new JSONException("JSONArray[" + index + "] not found.");
}
return this.opt(index);
}
/**
* Get the boolean value associated with an index. The string values "true"
* and "false" are converted to boolean.
*
* @param index
* The index must be between 0 and length() - 1.
* @return The truth.
* @throws JSONException
* If there is no value for the index or if the value is not
* convertible to boolean.
*/
public boolean getBoolean(int index) throws JSONException {
Object object = this.get(index);
if (object.equals(Boolean.FALSE)
|| (object instanceof String && ((String) object)
.equalsIgnoreCase("false"))) {
return false;
} else if (object.equals(Boolean.TRUE)
|| (object instanceof String && ((String) object)
.equalsIgnoreCase("true"))) {
return true;
}
throw wrongValueFormatException(index, "boolean", null);
}
/**
* Get the double value associated with an index.
*
* @param index
* The index must be between 0 and length() - 1.
* @return The value.
* @throws JSONException
* If the key is not found or if the value cannot be converted
* to a number.
*/
public double getDouble(int index) throws JSONException {
final Object object = this.get(index);
if(object instanceof Number) {
return ((Number)object).doubleValue();
}
try {
return Double.parseDouble(object.toString());
} catch (Exception e) {
throw wrongValueFormatException(index, "double", e);
}
}
/**
* Get the float value associated with a key.
*
* @param index
* The index must be between 0 and length() - 1.
* @return The numeric value.
* @throws JSONException
* if the key is not found or if the value is not a Number
* object and cannot be converted to a number.
*/
public float getFloat(int index) throws JSONException {
final Object object = this.get(index);
if(object instanceof Number) {
return ((Float)object).floatValue();
}
try {
return Float.parseFloat(object.toString());
} catch (Exception e) {
throw wrongValueFormatException(index, "float", e);
}
}
/**
* Get the Number value associated with a key.
*
* @param index
* The index must be between 0 and length() - 1.
* @return The numeric value.
* @throws JSONException
* if the key is not found or if the value is not a Number
* object and cannot be converted to a number.
*/
public Number getNumber(int index) throws JSONException {
Object object = this.get(index);
try {
if (object instanceof Number) {
return (Number)object;
}
return JSONObject.stringToNumber(object.toString());
} catch (Exception e) {
throw wrongValueFormatException(index, "number", e);
}
}
/**
* Get the enum value associated with an index.
*
* @param <E>
* Enum Type
* @param clazz
* The type of enum to retrieve.
* @param index
* The index must be between 0 and length() - 1.
* @return The enum value at the index location
* @throws JSONException
* if the key is not found or if the value cannot be converted
* to an enum.
*/
public <E extends Enum<E>> E getEnum(Class<E> clazz, int index) throws JSONException {
E val = optEnum(clazz, index);
if(val==null) {
// JSONException should really take a throwable argument.
// If it did, I would re-implement this with the Enum.valueOf
// method and place any thrown exception in the JSONException
throw wrongValueFormatException(index, "enum of type "
+ JSONObject.quote(clazz.getSimpleName()), null);
}
return val;
}
/**
* Get the BigDecimal value associated with an index. If the value is float
* or double, the the {@link BigDecimal#BigDecimal(double)} constructor
* will be used. See notes on the constructor for conversion issues that
* may arise.
*
* @param index
* The index must be between 0 and length() - 1.
* @return The value.
* @throws JSONException
* If the key is not found or if the value cannot be converted
* to a BigDecimal.
*/
public BigDecimal getBigDecimal (int index) throws JSONException {
Object object = this.get(index);
BigDecimal val = JSONObject.objectToBigDecimal(object, null);
if(val == null) {
throw wrongValueFormatException(index, "BigDecimal", object, null);
}
return val;
}
/**
* Get the BigInteger value associated with an index.
*
* @param index
* The index must be between 0 and length() - 1.
* @return The value.
* @throws JSONException
* If the key is not found or if the value cannot be converted
* to a BigInteger.
*/
public BigInteger getBigInteger (int index) throws JSONException {
Object object = this.get(index);
BigInteger val = JSONObject.objectToBigInteger(object, null);
if(val == null) {
throw wrongValueFormatException(index, "BigInteger", object, null);
}
return val;
}
/**
* Get the int value associated with an index.
*
* @param index
* The index must be between 0 and length() - 1.
* @return The value.
* @throws JSONException
* If the key is not found or if the value is not a number.
*/
public int getInt(int index) throws JSONException {
final Object object = this.get(index);
if(object instanceof Number) {
return ((Number)object).intValue();
}
try {
return Integer.parseInt(object.toString());
} catch (Exception e) {
throw wrongValueFormatException(index, "int", e);
}
}
/**
* Get the JSONArray associated with an index.
*
* @param index
* The index must be between 0 and length() - 1.
* @return A JSONArray value.
* @throws JSONException
* If there is no value for the index. or if the value is not a
* JSONArray
*/
public JSONArray getJSONArray(int index) throws JSONException {
Object object = this.get(index);
if (object instanceof JSONArray) {
return (JSONArray) object;
}
throw wrongValueFormatException(index, "JSONArray", null);
}
/**
* Get the JSONObject associated with an index.
*
* @param index
* subscript
* @return A JSONObject value.
* @throws JSONException
* If there is no value for the index or if the value is not a
* JSONObject
*/
public JSONObject getJSONObject(int index) throws JSONException {
Object object = this.get(index);
if (object instanceof JSONObject) {
return (JSONObject) object;
}
throw wrongValueFormatException(index, "JSONObject", null);
}
/**
* Get the long value associated with an index.
*
* @param index
* The index must be between 0 and length() - 1.
* @return The value.
* @throws JSONException
* If the key is not found or if the value cannot be converted
* to a number.
*/
public long getLong(int index) throws JSONException {
final Object object = this.get(index);
if(object instanceof Number) {
return ((Number)object).longValue();
}
try {
return Long.parseLong(object.toString());
} catch (Exception e) {
throw wrongValueFormatException(index, "long", e);
}
}
/**
* Get the string associated with an index.
*
* @param index
* The index must be between 0 and length() - 1.
* @return A string value.
* @throws JSONException
* If there is no string value for the index.
*/
public String getString(int index) throws JSONException {
Object object = this.get(index);
if (object instanceof String) {
return (String) object;
}
throw wrongValueFormatException(index, "String", null);
}
/**
* Determine if the value is <code>null</code>.
*
* @param index
* The index must be between 0 and length() - 1.
* @return true if the value at the index is <code>null</code>, or if there is no value.
*/
public boolean isNull(int index) {
return JSONObject.NULL.equals(this.opt(index));
}
/**
* Make a string from the contents of this JSONArray. The
* <code>separator</code> string is inserted between each element. Warning:
* This method assumes that the data structure is acyclical.
*
* @param separator
* A string that will be inserted between the elements.
* @return a string.
* @throws JSONException
* If the array contains an invalid number.
*/
public String join(String separator) throws JSONException {
int len = this.length();
if (len == 0) {
return "";
}
StringBuilder sb = new StringBuilder(
JSONObject.valueToString(this.myArrayList.get(0)));
for (int i = 1; i < len; i++) {
sb.append(separator)
.append(JSONObject.valueToString(this.myArrayList.get(i)));
}
return sb.toString();
}
/**
* Get the number of elements in the JSONArray, included nulls.
*
* @return The length (or size).
*/
public int length() {
return this.myArrayList.size();
}
/**
* Get the optional object value associated with an index.
*
* @param index
* The index must be between 0 and length() - 1. If not, null is returned.
* @return An object value, or null if there is no object at that index.
*/
public Object opt(int index) {
return (index < 0 || index >= this.length()) ? null : this.myArrayList
.get(index);
}
/**
* Get the optional boolean value associated with an index. It returns false
* if there is no value at that index, or if the value is not Boolean.TRUE
* or the String "true".
*
* @param index
* The index must be between 0 and length() - 1.
* @return The truth.
*/
public boolean optBoolean(int index) {
return this.optBoolean(index, false);
}
/**
* Get the optional boolean value associated with an index. It returns the
* defaultValue if there is no value at that index or if it is not a Boolean
* or the String "true" or "false" (case insensitive).
*
* @param index
* The index must be between 0 and length() - 1.
* @param defaultValue
* A boolean default.
* @return The truth.
*/
public boolean optBoolean(int index, boolean defaultValue) {
try {
return this.getBoolean(index);
} catch (Exception e) {
return defaultValue;
}
}
/**
* Get the optional double value associated with an index. NaN is returned
* if there is no value for the index, or if the value is not a number and
* cannot be converted to a number.
*
* @param index
* The index must be between 0 and length() - 1.
* @return The value.
*/
public double optDouble(int index) {
return this.optDouble(index, Double.NaN);
}
/**
* Get the optional double value associated with an index. The defaultValue
* is returned if there is no value for the index, or if the value is not a
* number and cannot be converted to a number.
*
* @param index
* subscript
* @param defaultValue
* The default value.
* @return The value.
*/
public double optDouble(int index, double defaultValue) {
final Number val = this.optNumber(index, null);
if (val == null) {
return defaultValue;
}
final double doubleValue = val.doubleValue();
// if (Double.isNaN(doubleValue) || Double.isInfinite(doubleValue)) {
// return defaultValue;
// }
return doubleValue;
}
/**
* Get the optional float value associated with an index. NaN is returned
* if there is no value for the index, or if the value is not a number and
* cannot be converted to a number.
*
* @param index
* The index must be between 0 and length() - 1.
* @return The value.
*/
public float optFloat(int index) {
return this.optFloat(index, Float.NaN);
}
/**
* Get the optional float value associated with an index. The defaultValue
* is returned if there is no value for the index, or if the value is not a
* number and cannot be converted to a number.
*
* @param index
* subscript
* @param defaultValue
* The default value.
* @return The value.
*/
public float optFloat(int index, float defaultValue) {
final Number val = this.optNumber(index, null);
if (val == null) {
return defaultValue;
}
final float floatValue = val.floatValue();
// if (Float.isNaN(floatValue) || Float.isInfinite(floatValue)) {
// return floatValue;
// }
return floatValue;
}
/**
* Get the optional int value associated with an index. Zero is returned if
* there is no value for the index, or if the value is not a number and
* cannot be converted to a number.
*
* @param index
* The index must be between 0 and length() - 1.
* @return The value.
*/
public int optInt(int index) {
return this.optInt(index, 0);
}
/**
* Get the optional int value associated with an index. The defaultValue is
* returned if there is no value for the index, or if the value is not a
* number and cannot be converted to a number.
*
* @param index
* The index must be between 0 and length() - 1.
* @param defaultValue
* The default value.
* @return The value.
*/
public int optInt(int index, int defaultValue) {
final Number val = this.optNumber(index, null);
if (val == null) {
return defaultValue;
}
return val.intValue();
}
/**
* Get the enum value associated with a key.
*
* @param <E>
* Enum Type
* @param clazz
* The type of enum to retrieve.
* @param index
* The index must be between 0 and length() - 1.
* @return The enum value at the index location or null if not found
*/
public <E extends Enum<E>> E optEnum(Class<E> clazz, int index) {
return this.optEnum(clazz, index, null);
}
/**
* Get the enum value associated with a key.
*
* @param <E>
* Enum Type
* @param clazz
* The type of enum to retrieve.
* @param index
* The index must be between 0 and length() - 1.
* @param defaultValue
* The default in case the value is not found
* @return The enum value at the index location or defaultValue if
* the value is not found or cannot be assigned to clazz
*/
public <E extends Enum<E>> E optEnum(Class<E> clazz, int index, E defaultValue) {
try {
Object val = this.opt(index);
if (JSONObject.NULL.equals(val)) {
return defaultValue;
}
if (clazz.isAssignableFrom(val.getClass())) {
// we just checked it!
@SuppressWarnings("unchecked")
E myE = (E) val;
return myE;
}
return Enum.valueOf(clazz, val.toString());
} catch (IllegalArgumentException e) {
return defaultValue;
} catch (NullPointerException e) {
return defaultValue;
}
}
/**
* Get the optional BigInteger value associated with an index. The
* defaultValue is returned if there is no value for the index, or if the
* value is not a number and cannot be converted to a number.
*
* @param index
* The index must be between 0 and length() - 1.
* @param defaultValue
* The default value.
* @return The value.
*/
public BigInteger optBigInteger(int index, BigInteger defaultValue) {
Object val = this.opt(index);
return JSONObject.objectToBigInteger(val, defaultValue);
}
/**
* Get the optional BigDecimal value associated with an index. The
* defaultValue is returned if there is no value for the index, or if the
* value is not a number and cannot be converted to a number. If the value
* is float or double, the the {@link BigDecimal#BigDecimal(double)}
* constructor will be used. See notes on the constructor for conversion
* issues that may arise.
*
* @param index
* The index must be between 0 and length() - 1.
* @param defaultValue
* The default value.
* @return The value.
*/
public BigDecimal optBigDecimal(int index, BigDecimal defaultValue) {
Object val = this.opt(index);
return JSONObject.objectToBigDecimal(val, defaultValue);
}
/**
* Get the optional JSONArray associated with an index.
*
* @param index
* subscript
* @return A JSONArray value, or null if the index has no value, or if the
* value is not a JSONArray.
*/
public JSONArray optJSONArray(int index) {
Object o = this.opt(index);
return o instanceof JSONArray ? (JSONArray) o : null;
}
/**
* Get the optional JSONObject associated with an index. Null is returned if
* the key is not found, or null if the index has no value, or if the value
* is not a JSONObject.
*
* @param index
* The index must be between 0 and length() - 1.
* @return A JSONObject value.
*/
public JSONObject optJSONObject(int index) {
Object o = this.opt(index);
return o instanceof JSONObject ? (JSONObject) o : null;
}
/**
* Get the optional long value associated with an index. Zero is returned if
* there is no value for the index, or if the value is not a number and
* cannot be converted to a number.
*
* @param index
* The index must be between 0 and length() - 1.
* @return The value.
*/
public long optLong(int index) {
return this.optLong(index, 0);
}
/**
* Get the optional long value associated with an index. The defaultValue is
* returned if there is no value for the index, or if the value is not a
* number and cannot be converted to a number.
*
* @param index
* The index must be between 0 and length() - 1.
* @param defaultValue
* The default value.
* @return The value.
*/
public long optLong(int index, long defaultValue) {
final Number val = this.optNumber(index, null);
if (val == null) {
return defaultValue;
}
return val.longValue();
}
/**
* Get an optional {@link Number} value associated with a key, or <code>null</code>
* if there is no such key or if the value is not a number. If the value is a string,
* an attempt will be made to evaluate it as a number ({@link BigDecimal}). This method
* would be used in cases where type coercion of the number value is unwanted.
*
* @param index
* The index must be between 0 and length() - 1.
* @return An object which is the value.
*/
public Number optNumber(int index) {
return this.optNumber(index, null);
}
/**
* Get an optional {@link Number} value associated with a key, or the default if there
* is no such key or if the value is not a number. If the value is a string,
* an attempt will be made to evaluate it as a number ({@link BigDecimal}). This method
* would be used in cases where type coercion of the number value is unwanted.
*
* @param index
* The index must be between 0 and length() - 1.
* @param defaultValue
* The default.
* @return An object which is the value.
*/
public Number optNumber(int index, Number defaultValue) {
Object val = this.opt(index);
if (JSONObject.NULL.equals(val)) {
return defaultValue;
}
if (val instanceof Number){
return (Number) val;
}
if (val instanceof String) {
try {
return JSONObject.stringToNumber((String) val);
} catch (Exception e) {
return defaultValue;
}
}
return defaultValue;
}
/**
* Get the optional string value associated with an index. It returns an
* empty string if there is no value at that index. If the value is not a
* string and is not null, then it is converted to a string.
*
* @param index
* The index must be between 0 and length() - 1.
* @return A String value.
*/
public String optString(int index) {
return this.optString(index, "");
}
/**
* Get the optional string associated with an index. The defaultValue is
* returned if the key is not found.
*
* @param index
* The index must be between 0 and length() - 1.
* @param defaultValue
* The default value.
* @return A String value.
*/
public String optString(int index, String defaultValue) {
Object object = this.opt(index);
return JSONObject.NULL.equals(object) ? defaultValue : object
.toString();
}
/**
* Append a boolean value. This increases the array's length by one.
*
* @param value
* A boolean value.
* @return this.
*/
public JSONArray put(boolean value) {
return this.put(value ? Boolean.TRUE : Boolean.FALSE);
}
/**
* Put a value in the JSONArray, where the value will be a JSONArray which
* is produced from a Collection.
*
* @param value
* A Collection value.
* @return this.
* @throws JSONException
* If the value is non-finite number.
*/
public JSONArray put(Collection<?> value) {
return this.put(new JSONArray(value));
}
/**
* Append a double value. This increases the array's length by one.
*
* @param value
* A double value.
* @return this.
* @throws JSONException
* if the value is not finite.
*/
public JSONArray put(double value) throws JSONException {
return this.put(Double.valueOf(value));
}
/**
* Append a float value. This increases the array's length by one.
*
* @param value
* A float value.
* @return this.
* @throws JSONException
* if the value is not finite.
*/
public JSONArray put(float value) throws JSONException {
return this.put(Float.valueOf(value));
}
/**
* Append an int value. This increases the array's length by one.
*
* @param value
* An int value.
* @return this.
*/
public JSONArray put(int value) {
return this.put(Integer.valueOf(value));
}
/**
* Append an long value. This increases the array's length by one.
*
* @param value
* A long value.