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com.zabbix4j.utils.json.JSONArray Maven / Gradle / Ivy
package com.zabbix4j.utils.json;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
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 2014-05-03
*/
public class JSONArray {
/**
* 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 '['");
}
if (x.nextClean() != ']') {
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 ',':
if (x.nextClean() == ']') {
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) {
this.myArrayList = new ArrayList();
if (collection != null) {
Iterator iter = collection.iterator();
while (iter.hasNext()) {
this.myArrayList.add(JSONObject.wrap(iter.next()));
}
}
}
/**
* Construct a JSONArray from an array
*
* @throws JSONException If not an array.
*/
public JSONArray(Object array) throws JSONException {
this();
if (array.getClass().isArray()) {
int length = Array.getLength(array);
for (int i = 0; i < length; i += 1) {
this.put(JSONObject.wrap(Array.get(array, i)));
}
} else {
throw new JSONException(
"JSONArray initial value should be a string or collection or array.");
}
}
/**
* 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 new JSONException("JSONArray[" + index + "] is not a boolean.");
}
/**
* 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 {
Object object = this.get(index);
try {
return object instanceof Number ? ((Number) object).doubleValue()
: Double.parseDouble((String) object);
} catch (Exception e) {
throw new JSONException("JSONArray[" + index + "] is not a number.");
}
}
/**
* 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 {
Object object = this.get(index);
try {
return object instanceof Number ? ((Number) object).intValue()
: Integer.parseInt((String) object);
} catch (Exception e) {
throw new JSONException("JSONArray[" + index + "] is not a number.");
}
}
/**
* 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 new JSONException("JSONArray[" + index + "] is not a JSONArray.");
}
/**
* 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 new JSONException("JSONArray[" + index + "] is not a JSONObject.");
}
/**
* 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 {
Object object = this.get(index);
try {
return object instanceof Number ? ((Number) object).longValue()
: Long.parseLong((String) object);
} catch (Exception e) {
throw new JSONException("JSONArray[" + index + "] is not a number.");
}
}
/**
* 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 new JSONException("JSONArray[" + index + "] not a string.");
}
/**
* 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();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < len; i += 1) {
if (i > 0) {
sb.append(separator);
}
sb.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.
* @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) {
try {
return this.getDouble(index);
} catch (Exception e) {
return defaultValue;
}
}
/**
* 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) {
try {
return this.getInt(index);
} catch (Exception e) {
return 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) {
try {
return this.getLong(index);
} catch (Exception e) {
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 coverted 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) {
this.put(value ? Boolean.TRUE : Boolean.FALSE);
return this;
}
/**
* 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.
*/
public JSONArray put(Collection value) {
this.put(new JSONArray(value));
return this;
}
/**
* 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 {
Double d = new Double(value);
JSONObject.testValidity(d);
this.put(d);
return this;
}
/**
* Append an int value. This increases the array's length by one.
*
* @param value An int value.
* @return this.
*/
public JSONArray put(int value) {
this.put(new Integer(value));
return this;
}
/**
* Append an long value. This increases the array's length by one.
*
* @param value A long value.
* @return this.
*/
public JSONArray put(long value) {
this.put(new Long(value));
return this;
}
/**
* 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.
*/
public JSONArray put(Map value) {
this.put(new JSONObject(value));
return this;
}
/**
* 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.
*/
public JSONArray put(Object 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 {
this.put(index, value ? Boolean.TRUE : Boolean.FALSE);
return this;
}
/**
* 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 not finite.
*/
public JSONArray put(int index, Collection value) throws JSONException {
this.put(index, new JSONArray(value));
return this;
}
/**
* 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 not finite.
*/
public JSONArray put(int index, double value) throws JSONException {
this.put(index, new Double(value));
return this;
}
/**
* 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 {
this.put(index, new Integer(value));
return this;
}
/**
* 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 {
this.put(index, new Long(value));
return this;
}
/**
* 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 the value is an invalid
* number.
*/
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 the value is an invalid
* number.
*/
public JSONArray put(int index, Object value) throws JSONException {
JSONObject.testValidity(value);
if (index < 0) {
throw new JSONException("JSONArray[" + index + "] not found.");
}
if (index < this.length()) {
this.myArrayList.set(index, value);
} else {
while (index != this.length()) {
this.put(JSONObject.NULL);
}
this.put(value);
}
return this;
}
/**
* 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.get(i);
Object valueOther = ((JSONArray) other).get(i);
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.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.length() == 0 || this.length() == 0) {
return null;
}
JSONObject jo = new JSONObject();
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.
*/
public String toString() {
try {
return this.toString(0);
} catch (Exception e) {
return null;
}
}
/**
* Make a prettyprinted JSON text of this JSONArray. 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
*/
public String toString(int indentFactor) throws JSONException {
StringWriter sw = new StringWriter();
synchronized (sw.getBuffer()) {
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.
*
* @return The writer.
* @throws JSONException
*/
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. For
* compactness, no whitespace is added.
*
* Warning: This method assumes that the data structure is acyclical.
*
* @param indentFactor The number of spaces to add to each level of indentation.
* @param indent The indention of the top level.
* @return The writer.
* @throws JSONException
*/
Writer write(Writer writer, int indentFactor, int indent)
throws JSONException {
try {
boolean commanate = false;
int length = this.length();
writer.write('[');
if (length == 1) {
JSONObject.writeValue(writer, this.myArrayList.get(0),
indentFactor, indent);
} else if (length != 0) {
final int newindent = indent + indentFactor;
for (int i = 0; i < length; i += 1) {
if (commanate) {
writer.write(',');
}
if (indentFactor > 0) {
writer.write('\n');
}
JSONObject.indent(writer, newindent);
JSONObject.writeValue(writer, this.myArrayList.get(i),
indentFactor, newindent);
commanate = true;
}
if (indentFactor > 0) {
writer.write('\n');
}
JSONObject.indent(writer, indent);
}
writer.write(']');
return writer;
} catch (IOException e) {
throw new JSONException(e);
}
}
}
