net.sourceforge.plantuml.json.Json Maven / Gradle / Ivy
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package net.sourceforge.plantuml.json;
import java.io.IOException;
import java.io.Reader;
/**
* This class serves as the entry point to the minimal-json API.
*
* To parse a given JSON input, use the parse()
* methods like in this example:
*
*
*
* JsonObject object = Json.parse(string).asObject();
*
*
* To create a JSON data structure to be serialized, use the
* methods value(), array(), and
* object(). For example, the following snippet will produce the
* JSON string {"foo": 23, "bar": true}:
*
*
*
* String string = Json.object().add("foo", 23).add("bar", true).toString();
*
*
* To create a JSON array from a given Java array, you can use one of the
* array() methods with varargs parameters:
*
*
*
* String[] names = ...
* JsonArray array = Json.array(names);
*
*/
public final class Json {
private Json() {
// not meant to be instantiated
}
/**
* Represents the JSON literal null.
*/
public static final JsonValue NULL = new JsonLiteral("null");
/**
* Represents the JSON literal true.
*/
public static final JsonValue TRUE = new JsonLiteral("true");
/**
* Represents the JSON literal false.
*/
public static final JsonValue FALSE = new JsonLiteral("false");
/**
* Returns a JsonValue instance that represents the given int
* value.
*
* @param value the value to get a JSON representation for
* @return a JSON value that represents the given value
*/
public static JsonValue value(int value) {
return new JsonNumber(Integer.toString(value, 10));
}
/**
* Returns a JsonValue instance that represents the given long
* value.
*
* @param value the value to get a JSON representation for
* @return a JSON value that represents the given value
*/
public static JsonValue value(long value) {
return new JsonNumber(Long.toString(value, 10));
}
/**
* Returns a JsonValue instance that represents the given float
* value.
*
* @param value the value to get a JSON representation for
* @return a JSON value that represents the given value
*/
public static JsonValue value(float value) {
if (Float.isInfinite(value) || Float.isNaN(value)) {
throw new IllegalArgumentException("Infinite and NaN values not permitted in JSON");
}
return new JsonNumber(cutOffPointZero(Float.toString(value)));
}
/**
* Returns a JsonValue instance that represents the given double
* value.
*
* @param value the value to get a JSON representation for
* @return a JSON value that represents the given value
*/
public static JsonValue value(double value) {
if (Double.isInfinite(value) || Double.isNaN(value)) {
throw new IllegalArgumentException("Infinite and NaN values not permitted in JSON");
}
return new JsonNumber(cutOffPointZero(Double.toString(value)));
}
/**
* Returns a JsonValue instance that represents the given string.
*
* @param string the string to get a JSON representation for
* @return a JSON value that represents the given string
*/
public static JsonValue value(String string) {
return string == null ? NULL : new JsonString(string);
}
/**
* Returns a JsonValue instance that represents the given boolean
* value.
*
* @param value the value to get a JSON representation for
* @return a JSON value that represents the given value
*/
public static JsonValue value(boolean value) {
return value ? TRUE : FALSE;
}
/**
* Creates a new empty JsonArray. This is equivalent to creating a new JsonArray
* using the constructor.
*
* @return a new empty JSON array
*/
public static JsonArray array() {
return new JsonArray();
}
/**
* Creates a new JsonArray that contains the JSON representations of the given
* int values.
*
* @param values the values to be included in the new JSON array
* @return a new JSON array that contains the given values
*/
public static JsonArray array(int... values) {
if (values == null) {
throw new NullPointerException("values is null");
}
JsonArray array = new JsonArray();
for (int value : values) {
array.add(value);
}
return array;
}
/**
* Creates a new JsonArray that contains the JSON representations of the given
* long values.
*
* @param values the values to be included in the new JSON array
* @return a new JSON array that contains the given values
*/
public static JsonArray array(long... values) {
if (values == null) {
throw new NullPointerException("values is null");
}
JsonArray array = new JsonArray();
for (long value : values) {
array.add(value);
}
return array;
}
/**
* Creates a new JsonArray that contains the JSON representations of the given
* float values.
*
* @param values the values to be included in the new JSON array
* @return a new JSON array that contains the given values
*/
public static JsonArray array(float... values) {
if (values == null) {
throw new NullPointerException("values is null");
}
JsonArray array = new JsonArray();
for (float value : values) {
array.add(value);
}
return array;
}
/**
* Creates a new JsonArray that contains the JSON representations of the given
* double values.
*
* @param values the values to be included in the new JSON array
* @return a new JSON array that contains the given values
*/
public static JsonArray array(double... values) {
if (values == null) {
throw new NullPointerException("values is null");
}
JsonArray array = new JsonArray();
for (double value : values) {
array.add(value);
}
return array;
}
/**
* Creates a new JsonArray that contains the JSON representations of the given
* boolean values.
*
* @param values the values to be included in the new JSON array
* @return a new JSON array that contains the given values
*/
public static JsonArray array(boolean... values) {
if (values == null) {
throw new NullPointerException("values is null");
}
JsonArray array = new JsonArray();
for (boolean value : values) {
array.add(value);
}
return array;
}
/**
* Creates a new JsonArray that contains the JSON representations of the given
* strings.
*
* @param strings the strings to be included in the new JSON array
* @return a new JSON array that contains the given strings
*/
public static JsonArray array(String... strings) {
if (strings == null) {
throw new NullPointerException("values is null");
}
JsonArray array = new JsonArray();
for (String value : strings) {
array.add(value);
}
return array;
}
/**
* Creates a new empty JsonObject. This is equivalent to creating a new
* JsonObject using the constructor.
*
* @return a new empty JSON object
*/
public static JsonObject object() {
return new JsonObject();
}
/**
* Parses the given input string as JSON. The input must contain a valid JSON
* value, optionally padded with whitespace.
*
* @param string the input string, must be valid JSON
* @return a value that represents the parsed JSON
* @throws ParseException if the input is not valid JSON
*/
public static JsonValue parse(String string) {
if (string == null) {
throw new NullPointerException("string is null");
}
DefaultHandler handler = new DefaultHandler();
new JsonParser(handler).parse(string);
return handler.getValue();
}
/**
* Reads the entire input from the given reader and parses it as JSON. The input
* must contain a valid JSON value, optionally padded with whitespace.
*
* Characters are read in chunks into an input buffer. Hence, wrapping a reader
* in an additional BufferedReader likely won't improve reading
* performance.
*
*
* @param reader the reader to read the JSON value from
* @return a value that represents the parsed JSON
* @throws IOException if an I/O error occurs in the reader
* @throws ParseException if the input is not valid JSON
*/
public static JsonValue parse(Reader reader) throws IOException {
if (reader == null) {
throw new NullPointerException("reader is null");
}
DefaultHandler handler = new DefaultHandler();
new JsonParser(handler).parse(reader);
return handler.getValue();
}
private static String cutOffPointZero(String string) {
if (string.endsWith(".0")) {
return string.substring(0, string.length() - 2);
}
return string;
}
public static class DefaultHandler extends JsonHandler {
protected JsonValue value;
@Override
public JsonArray startArray() {
return new JsonArray();
}
@Override
public JsonObject startObject() {
return new JsonObject();
}
@Override
public void endNull() {
value = NULL;
}
@Override
public void endBoolean(boolean bool) {
value = bool ? TRUE : FALSE;
}
@Override
public void endString(String string) {
value = new JsonString(string);
}
@Override
public void endNumber(String string) {
value = new JsonNumber(string);
}
@Override
public void endArray(JsonArray array) {
value = array;
}
@Override
public void endObject(JsonObject object) {
value = object;
}
@Override
public void endArrayValue(JsonArray array) {
array.add(value);
}
@Override
public void endObjectValue(JsonObject object, String name) {
object.add(name, value);
}
public JsonValue getValue() {
return value;
}
}
}