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JSONArray.java
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1976 lines (1864 loc) · 66 KB
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package org.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 <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) {
this(collection, 0, new JSONParserConfiguration());
}
/**
* Construct a JSONArray from a Collection.
*
* @param collection
* A Collection.
* @param jsonParserConfiguration
* Configuration object for the JSON parser
*/
public JSONArray(Collection<?> collection, JSONParserConfiguration jsonParserConfiguration) {
this(collection, 0, jsonParserConfiguration);
}
/**
* Construct a JSONArray from a collection with recursion depth.
*
* @param collection
* A Collection.
* @param recursionDepth
* Variable for tracking the count of nested object creations.
* @param jsonParserConfiguration
* Configuration object for the JSON parser
*/
JSONArray(Collection<?> collection, int recursionDepth, JSONParserConfiguration jsonParserConfiguration) {
if (recursionDepth > jsonParserConfiguration.getMaxNestingDepth()) {
throw new JSONException("JSONArray has reached recursion depth limit of " + jsonParserConfiguration.getMaxNestingDepth());
}
if (collection == null) {
this.myArrayList = new ArrayList<Object>();
} else {
this.myArrayList = new ArrayList<Object>(collection.size());
this.addAll(collection, true, recursionDepth, jsonParserConfiguration);
}
}
/**
* 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, 0);
}
/**
* 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 {
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 NumberConversionUtil.stringToNumber(object.toString());
} catch (Exception e) {
throw wrongValueFormatException(index, "number", object, 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()), 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 <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();
}
/**
* 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 <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 {@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