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com.dimajix.shaded.json.JSONArray Maven / Gradle / Ivy
package com.dimajix.shaded.json;
/*
Public Domain.
*/
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 get and opt
* methods for accessing the values by index, and put methods for
* adding or replacing values. The values can be any of these types:
* Boolean, JSONArray, JSONObject,
* Number, String, or the
* JSONObject.NULL object.
*
* The constructor can convert a JSON text into a Java object. The
* toString method converts to JSON text.
*
* A get method returns a value if one can be found, and throws an
* exception if one cannot be found. An opt method returns a
* default value instead of throwing an exception, and so is useful for
* obtaining optional values.
*
* The generic get() and opt() methods return an
* object which you can cast or query for type. There are also typed
* get and opt methods that do type checking and type
* coercion for you.
*
* The texts produced by the toString methods strictly conform to
* JSON syntax rules. The constructors are more forgiving in the texts they will
* accept:
*
* An extra , (comma) may appear just
* before the closing bracket.
* The null value will be inserted when there is ,
* (comma) elision.
* Strings may be quoted with ' (single
* quote) .
* 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:
* { } [ ] / \ : , # and if they do not look like numbers and
* if they are not the reserved words true, false, or
* null.
*
*
* @author JSON.org
* @version 2016-08/15
*/
public class JSONArray implements Iterable {
/**
* The arrayList where the JSONArray's properties are kept.
*/
private final ArrayList myArrayList;
/**
* Construct an empty JSONArray.
*/
public JSONArray() {
this.myArrayList = new ArrayList();
}
/**
* 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 [ (left
* bracket) and ends with ]
* (right bracket) .
* @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();
} else {
this.myArrayList = new ArrayList(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();
} else {
// shallow copy directly the internal array lists as any wrapping
// should have been done already in the original JSONArray
this.myArrayList = new ArrayList(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(initialCapacity);
}
@Override
public Iterator 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 {
Object object = this.opt(index);
if (object == null) {
throw new JSONException("JSONArray[" + index + "] not found.");
}
return object;
}
/**
* 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", object, 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", object, 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 ((Number)object).floatValue();
}
try {
return Float.parseFloat(object.toString());
} catch (Exception e) {
throw wrongValueFormatException(index, "float", object, 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", object, e);
}
}
/**
* Get the enum value associated with an index.
*
* @param
* 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 getEnum(Class 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()), opt(index), null);
}
return val;
}
/**
* Get the BigDecimal value associated with an index. If the value is float
* or double, 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", object, 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", object, 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", object, 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", object, 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", object, null);
}
/**
* Determine if the value is null.
*
* @param index
* The index must be between 0 and length() - 1.
* @return true if the value at the index is null, 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
* separator 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();
}
/**
* Removes all of the elements from this JSONArray.
* The JSONArray will be empty after this call returns.
*/
public void clear() {
this.myArrayList.clear();
}
/**
* 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 Boolean object 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 optBooleanObject(int index) {
return this.optBooleanObject(index, false);
}
/**
* Get the optional Boolean object 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 optBooleanObject(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 Double object 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 object.
*/
public Double optDoubleObject(int index) {
return this.optDoubleObject(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 object.
* @return The object.
*/
public Double optDoubleObject(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 Float object 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 object.
*/
public Float optFloatObject(int index) {
return this.optFloatObject(index, Float.NaN);
}
/**
* Get the optional Float object 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 object.
* @return The object.
*/
public Float optFloatObject(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 optional Integer object 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 object.
*/
public Integer optIntegerObject(int index) {
return this.optIntegerObject(index, 0);
}
/**
* Get the optional Integer object 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 object.
* @return The object.
*/
public Integer optIntegerObject(int index, Integer 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
* 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 optEnum(Class clazz, int index) {
return this.optEnum(clazz, index, null);
}
/**
* Get the enum value associated with a key.
*
* @param
* 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 optEnum(Class 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 {@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. Null is returned if
* there is no value at that index or if the value is not a JSONArray.
*
* @param index
* The index must be between 0 and length() - 1.
* @return A JSONArray value.
*/
public JSONArray optJSONArray(int index) {
return this.optJSONArray(index, null);
}
/**
* Get the optional JSONArray associated with an index. The defaultValue is returned if
* there is no value at that index or if the value is not a JSONArray.
*
* @param index
* The index must be between 0 and length() - 1.
* @param defaultValue
* The default.
* @return A JSONArray value.
*/
public JSONArray optJSONArray(int index, JSONArray defaultValue) {
Object object = this.opt(index);
return object instanceof JSONArray ? (JSONArray) object : defaultValue;
}
/**
* Get the optional JSONObject associated with an index. Null is returned if
* there is no value at that index 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) {
return this.optJSONObject(index, null);
}
/**
* Get the optional JSONObject associated with an index. The defaultValue is returned if
* there is no value at that index or if the value is not a JSONObject.
*
* @param index
* The index must be between 0 and length() - 1.
* @param defaultValue
* The default.
* @return A JSONObject value.
*/
public JSONObject optJSONObject(int index, JSONObject defaultValue) {
Object object = this.opt(index);
return object instanceof JSONObject ? (JSONObject) object : defaultValue;
}
/**
* 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 the optional Long object 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 object.
*/
public Long optLongObject(int index) {
return this.optLongObject(index, 0L);
}
/**
* Get the optional Long object 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 object.
* @return The object.
*/
public Long optLongObject(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 null
* 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.
* @return this.
*/
public JSONArray put(long value) {
return this.put(Long.valueOf(value));
}
/**
* Put a value in the JSONArray, where the value will be a JSONObject which
* is produced from a Map.
*
* @param value
* A Map value.
* @return this.
* @throws JSONException
* If a value in the map is non-finite number.
* @throws NullPointerException
* If a key in the map is null
*/
public JSONArray put(Map value) {
return this.put(new JSONObject(value));
}
/**
* Append an object value. This increases the array's length by one.
*
* @param value
* An object value. The value should be a Boolean, Double,
* Integer, JSONArray, JSONObject, Long, or String, or the
* JSONObject.NULL object.
* @return this.
* @throws JSONException
* If the value is non-finite number.
*/
public JSONArray put(Object value) {
JSONObject.testValidity(value);
this.myArrayList.add(value);
return this;
}
/**
* Put or replace a boolean value in the JSONArray. If the index is greater
* than the length of the JSONArray, then null elements will be added as
* necessary to pad it out.
*
* @param index
* The subscript.
* @param value
* A boolean value.
* @return this.
* @throws JSONException
* If the index is negative.
*/
public JSONArray put(int index, boolean value) throws JSONException {
return this.put(index, 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 index
* The subscript.
* @param value
* A Collection value.
* @return this.
* @throws JSONException
* If the index is negative or if the value is non-finite.
*/
public JSONArray put(int index, Collection value) throws JSONException {
return this.put(index, new JSONArray(value));
}
/**
* Put or replace a double value. If the index is greater than the length of
* the JSONArray, then null elements will be added as necessary to pad it
* out.
*
* @param index
* The subscript.
* @param value
* A double value.
* @return this.
* @throws JSONException
* If the index is negative or if the value is non-finite.
*/
public JSONArray put(int index, double value) throws JSONException {
return this.put(index, Double.valueOf(value));
}
/**
* Put or replace a float value. If the index is greater than the length of
* the JSONArray, then null elements will be added as necessary to pad it
* out.
*
* @param index
* The subscript.
* @param value
* A float value.
* @return this.
* @throws JSONException
* If the index is negative or if the value is non-finite.
*/
public JSONArray put(int index, float value) throws JSONException {
return this.put(index, Float.valueOf(value));
}
/**
* Put or replace an int value. If the index is greater than the length of
* the JSONArray, then null elements will be added as necessary to pad it
* out.
*
* @param index
* The subscript.
* @param value
* An int value.
* @return this.
* @throws JSONException
* If the index is negative.
*/
public JSONArray put(int index, int value) throws JSONException {
return this.put(index, Integer.valueOf(value));
}
/**
* Put or replace a long value. If the index is greater than the length of
* the JSONArray, then null elements will be added as necessary to pad it
* out.
*
* @param index
* The subscript.
* @param value
* A long value.
* @return this.
* @throws JSONException
* If the index is negative.
*/
public JSONArray put(int index, long value) throws JSONException {
return this.put(index, Long.valueOf(value));
}
/**
* Put a value in the JSONArray, where the value will be a JSONObject that
* is produced from a Map.
*
* @param index
* The subscript.
* @param value
* The Map value.
* @return this.
* @throws JSONException
* If the index is negative or if the value is an invalid
* number.
* @throws NullPointerException
* If a key in the map is null
*/
public JSONArray put(int index, Map value) throws JSONException {
this.put(index, new JSONObject(value));
return this;
}
/**
* Put or replace an object value in the JSONArray. If the index is greater
* than the length of the JSONArray, then null elements will be added as
* necessary to pad it out.
*
* @param index
* The subscript.
* @param value
* The value to put into the array. The value should be a
* Boolean, Double, Integer, JSONArray, JSONObject, Long, or
* String, or the JSONObject.NULL object.
* @return this.
* @throws JSONException
* If the index is negative or if the value is an invalid
* number.
*/
public JSONArray put(int index, Object value) throws JSONException {
if (index < 0) {
throw new JSONException("JSONArray[" + index + "] not found.");
}
if (index < this.length()) {
JSONObject.testValidity(value);
this.myArrayList.set(index, value);
return this;
}
if(index == this.length()){
// simple append
return this.put(value);
}
// if we are inserting past the length, we want to grow the array all at once
// instead of incrementally.
this.myArrayList.ensureCapacity(index + 1);
while (index != this.length()) {
// we don't need to test validity of NULL objects
this.myArrayList.add(JSONObject.NULL);
}
return this.put(value);
}
/**
* Put a collection's elements in to the JSONArray.
*
* @param collection
* A Collection.
* @return this.
*/
public JSONArray putAll(Collection collection) {
this.addAll(collection, false);
return this;
}
/**
* Put an Iterable's elements in to the JSONArray.
*
* @param iter
* An Iterable.
* @return this.
*/
public JSONArray putAll(Iterable iter) {
this.addAll(iter, false);
return this;
}
/**
* Put a JSONArray's elements in to the JSONArray.
*
* @param array
* A JSONArray.
* @return this.
*/
public JSONArray putAll(JSONArray array) {
// directly copy the elements from the source array to this one
// as all wrapping should have been done already in the source.
this.myArrayList.addAll(array.myArrayList);
return this;
}
/**
* Put an array's elements in to the JSONArray.
*
* @param array
* Array. If the parameter passed is null, or not an array or Iterable, an
* exception will be thrown.
* @return this.
*
* @throws JSONException
* If not an array, JSONArray, Iterable or if an value is non-finite number.
* @throws NullPointerException
* Thrown if the array parameter is null.
*/
public JSONArray putAll(Object array) throws JSONException {
this.addAll(array, false);
return this;
}
/**
* Creates a JSONPointer using an initialization string and tries to
* match it to an item within this JSONArray. For example, given a
* JSONArray initialized with this document:
*
* [
* {"b":"c"}
* ]
*
* and this JSONPointer string:
*
* "/0/b"
*
* Then this method will return the String "c"
* A JSONPointerException may be thrown from code called by this method.
*
* @param jsonPointer string that can be used to create a JSONPointer
* @return the item matched by the JSONPointer, otherwise null
*/
public Object query(String jsonPointer) {
return query(new JSONPointer(jsonPointer));
}
/**
* Uses a user initialized JSONPointer and tries to
* match it to an item within this JSONArray. For example, given a
* JSONArray initialized with this document:
*
* [
* {"b":"c"}
* ]
*
* and this JSONPointer:
*
* "/0/b"
*
* Then this method will return the String "c"
* A JSONPointerException may be thrown from code called by this method.
*
* @param jsonPointer string that can be used to create a JSONPointer
* @return the item matched by the JSONPointer, otherwise null
*/
public Object query(JSONPointer jsonPointer) {
return jsonPointer.queryFrom(this);
}
/**
* Queries and returns a value from this object using {@code jsonPointer}, or
* returns null if the query fails due to a missing key.
*
* @param jsonPointer the string representation of the JSON pointer
* @return the queried value or {@code null}
* @throws IllegalArgumentException if {@code jsonPointer} has invalid syntax
*/
public Object optQuery(String jsonPointer) {
return optQuery(new JSONPointer(jsonPointer));
}
/**
* Queries and returns a value from this object using {@code jsonPointer}, or
* returns null if the query fails due to a missing key.
*
* @param jsonPointer The JSON pointer
* @return the queried value or {@code null}
* @throws IllegalArgumentException if {@code jsonPointer} has invalid syntax
*/
public Object optQuery(JSONPointer jsonPointer) {
try {
return jsonPointer.queryFrom(this);
} catch (JSONPointerException e) {
return null;
}
}
/**
* Remove an index and close the hole.
*
* @param index
* The index of the element to be removed.
* @return The value that was associated with the index, or null if there
* was no value.
*/
public Object remove(int index) {
return index >= 0 && index < this.length()
? this.myArrayList.remove(index)
: null;
}
/**
* Determine if two JSONArrays are similar.
* They must contain similar sequences.
*
* @param other The other JSONArray
* @return true if they are equal
*/
public boolean similar(Object other) {
if (!(other instanceof JSONArray)) {
return false;
}
int len = this.length();
if (len != ((JSONArray)other).length()) {
return false;
}
for (int i = 0; i < len; i += 1) {
Object valueThis = this.myArrayList.get(i);
Object valueOther = ((JSONArray)other).myArrayList.get(i);
if(valueThis == valueOther) {
continue;
}
if(valueThis == null) {
return false;
}
if (valueThis instanceof JSONObject) {
if (!((JSONObject)valueThis).similar(valueOther)) {
return false;
}
} else if (valueThis instanceof JSONArray) {
if (!((JSONArray)valueThis).similar(valueOther)) {
return false;
}
} else if (valueThis instanceof Number && valueOther instanceof Number) {
if (!JSONObject.isNumberSimilar((Number)valueThis, (Number)valueOther)) {
return false;
}
} else if (valueThis instanceof JSONString && valueOther instanceof JSONString) {
if (!((JSONString) valueThis).toJSONString().equals(((JSONString) valueOther).toJSONString())) {
return false;
}
} else if (!valueThis.equals(valueOther)) {
return false;
}
}
return true;
}
/**
* Produce a JSONObject by combining a JSONArray of names with the values of
* this JSONArray.
*
* @param names
* A JSONArray containing a list of key strings. These will be
* paired with the values.
* @return A JSONObject, or null if there are no names or if this JSONArray
* has no values.
* @throws JSONException
* If any of the names are null.
*/
public JSONObject toJSONObject(JSONArray names) throws JSONException {
if (names == null || names.isEmpty() || this.isEmpty()) {
return null;
}
JSONObject jo = new JSONObject(names.length());
for (int i = 0; i < names.length(); i += 1) {
jo.put(names.getString(i), this.opt(i));
}
return jo;
}
/**
* Make a JSON text of this JSONArray. For compactness, no unnecessary
* whitespace is added. If it is not possible to produce a syntactically
* correct JSON text then null will be returned instead. This could occur if
* the array contains an invalid number.
*
* Warning: This method assumes that the data structure is acyclical.
*
*
* @return a printable, displayable, transmittable representation of the
* array.
*/
@Override
public String toString() {
try {
return this.toString(0);
} catch (Exception e) {
return null;
}
}
/**
* Make a pretty-printed JSON text of this JSONArray.
*
*
If
{@code indentFactor > 0} and the {@link JSONArray} has only
* one element, then the array will be output on a single line:
* {@code [1]}
*
* If an array has 2 or more elements, then it will be output across
* multiple lines:
{@code
* [
* 1,
* "value 2",
* 3
* ]
* }
*
* Warning: This method assumes that the data structure is acyclical.
*
*
* @param indentFactor
* The number of spaces to add to each level of indentation.
* @return a printable, displayable, transmittable representation of the
* object, beginning with [ (left
* bracket) and ending with ]
* (right bracket) .
* @throws JSONException if a called function fails
*/
@SuppressWarnings("resource")
public String toString(int indentFactor) throws JSONException {
StringWriter sw = new StringWriter();
return this.write(sw, indentFactor, 0).toString();
}
/**
* Write the contents of the JSONArray as JSON text to a writer. For
* compactness, no whitespace is added.
*
* Warning: This method assumes that the data structure is acyclical.
*
* @param writer the writer object
* @return The writer.
* @throws JSONException if a called function fails
*/
public Writer write(Writer writer) throws JSONException {
return this.write(writer, 0, 0);
}
/**
* Write the contents of the JSONArray as JSON text to a writer.
*
*
If
{@code indentFactor > 0} and the {@link JSONArray} has only
* one element, then the array will be output on a single line:
* {@code [1]}
*
* If an array has 2 or more elements, then it will be output across
* multiple lines:
{@code
* [
* 1,
* "value 2",
* 3
* ]
* }
*
* Warning: This method assumes that the data structure is acyclical.
*
*
* @param writer
* Writes the serialized JSON
* @param indentFactor
* The number of spaces to add to each level of indentation.
* @param indent
* The indentation of the top level.
* @return The writer.
* @throws JSONException if a called function fails or unable to write
*/
@SuppressWarnings("resource")
public Writer write(Writer writer, int indentFactor, int indent)
throws JSONException {
try {
boolean needsComma = false;
int length = this.length();
writer.write('[');
if (length == 1) {
try {
JSONObject.writeValue(writer, this.myArrayList.get(0),
indentFactor, indent);
} catch (Exception e) {
throw new JSONException("Unable to write JSONArray value at index: 0", e);
}
} else if (length != 0) {
final int newIndent = indent + indentFactor;
for (int i = 0; i < length; i += 1) {
if (needsComma) {
writer.write(',');
}
if (indentFactor > 0) {
writer.write('\n');
}
JSONObject.indent(writer, newIndent);
try {
JSONObject.writeValue(writer, this.myArrayList.get(i),
indentFactor, newIndent);
} catch (Exception e) {
throw new JSONException("Unable to write JSONArray value at index: " + i, e);
}
needsComma = true;
}
if (indentFactor > 0) {
writer.write('\n');
}
JSONObject.indent(writer, indent);
}
writer.write(']');
return writer;
} catch (IOException e) {
throw new JSONException(e);
}
}
/**
* Returns a java.util.List containing all of the elements in this array.
* If an element in the array is a JSONArray or JSONObject it will also
* be converted to a List and a Map respectively.
*
* Warning: This method assumes that the data structure is acyclical.
*
* @return a java.util.List containing the elements of this array
*/
public List toList() {
List results = new ArrayList(this.myArrayList.size());
for (Object element : this.myArrayList) {
if (element == null || JSONObject.NULL.equals(element)) {
results.add(null);
} else if (element instanceof JSONArray) {
results.add(((JSONArray) element).toList());
} else if (element instanceof JSONObject) {
results.add(((JSONObject) element).toMap());
} else {
results.add(element);
}
}
return results;
}
/**
* Check if JSONArray is empty.
*
* @return true if JSONArray is empty, otherwise false.
*/
public boolean isEmpty() {
return this.myArrayList.isEmpty();
}
/**
* Add a collection's elements to the JSONArray.
*
* @param collection
* A Collection.
* @param wrap
* {@code true} to call {@link JSONObject#wrap(Object)} for each item,
* {@code false} to add the items directly
*
*/
private void addAll(Collection collection, boolean wrap) {
this.myArrayList.ensureCapacity(this.myArrayList.size() + collection.size());
if (wrap) {
for (Object o: collection){
this.put(JSONObject.wrap(o));
}
} else {
for (Object o: collection){
this.put(o);
}
}
}
/**
* Add an Iterable's elements to the JSONArray.
*
* @param iter
* An Iterable.
* @param wrap
* {@code true} to call {@link JSONObject#wrap(Object)} for each item,
* {@code false} to add the items directly
*/
private void addAll(Iterable iter, boolean wrap) {
if (wrap) {
for (Object o: iter){
this.put(JSONObject.wrap(o));
}
} else {
for (Object o: iter){
this.put(o);
}
}
}
/**
* Add an array's elements to the JSONArray.
*
* @param array
* Array. If the parameter passed is null, or not an array,
* JSONArray, Collection, or Iterable, an exception will be
* thrown.
* @param wrap
* {@code true} to call {@link JSONObject#wrap(Object)} for each item,
* {@code false} to add the items directly
*
* @throws JSONException
* If not an array or if an array value is non-finite number.
* @throws NullPointerException
* Thrown if the array parameter is null.
*/
private void addAll(Object array, boolean wrap) throws JSONException {
if (array.getClass().isArray()) {
int length = Array.getLength(array);
this.myArrayList.ensureCapacity(this.myArrayList.size() + length);
if (wrap) {
for (int i = 0; i < length; i += 1) {
this.put(JSONObject.wrap(Array.get(array, i)));
}
} else {
for (int i = 0; i < length; i += 1) {
this.put(Array.get(array, i));
}
}
} else if (array instanceof JSONArray) {
// use the built in array list `addAll` as all object
// wrapping should have been completed in the original
// JSONArray
this.myArrayList.addAll(((JSONArray)array).myArrayList);
} else if (array instanceof Collection) {
this.addAll((Collection)array, wrap);
} else if (array instanceof Iterable) {
this.addAll((Iterable)array, wrap);
} else {
throw new JSONException(
"JSONArray initial value should be a string or collection or array.");
}
}
/**
* Create a new JSONException in a common format for incorrect conversions.
* @param idx index of the item
* @param valueType the type of value being coerced to
* @param cause optional cause of the coercion failure
* @return JSONException that can be thrown.
*/
private static JSONException wrongValueFormatException(
int idx,
String valueType,
Object value,
Throwable cause) {
if(value == null) {
return new JSONException(
"JSONArray[" + idx + "] is not a " + valueType + " (null)."
, cause);
}
// don't try to toString collections or known object types that could be large.
if(value instanceof Map || value instanceof Iterable || value instanceof JSONObject) {
return new JSONException(
"JSONArray[" + idx + "] is not a " + valueType + " (" + value.getClass() + ")."
, cause);
}
return new JSONException(
"JSONArray[" + idx + "] is not a " + valueType + " (" + value.getClass() + " : " + value + ")."
, cause);
}
}
