blade.kit.json.Json Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2015 EclipseSource.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
******************************************************************************/
package blade.kit.json;
import java.io.IOException;
import java.io.Reader;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import blade.kit.CollectionKit;
/**
* 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);
*
*/
@SuppressWarnings("unchecked")
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 JsonValue 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");
}
try {
return new JsonParser(string).parse();
} catch (IOException exception) {
// JsonParser does not throw IOException for String
throw new RuntimeException(exception);
}
}
/**
* Reads the entire input stream 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 and buffered internally, therefore wrapping
* an existing reader in an additional BufferedReader does
* not 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");
}
return new JsonParser(reader).parse();
}
/**
* 对象转换为JsonValue对象
*
* @param bean
* @return
*/
public static JsonObject parse(Object bean) {
JsonObject json = new JsonObject();
Class klass = bean.getClass();
boolean includeSuperClass = klass.getClassLoader() != null;
Method[] methods = includeSuperClass ? klass.getMethods() : klass.getDeclaredMethods();
for (int i = 0; i < methods.length; i += 1) {
try {
Method method = methods[i];
if (Modifier.isPublic(method.getModifiers())) {
String name = method.getName();
String key = "";
if (name.startsWith("get")) {
if ("getClass".equals(name) || "getDeclaringClass".equals(name)) {
key = "";
} else {
key = name.substring(3);
}
} else if (name.startsWith("is")) {
key = name.substring(2);
}
if (key.length() > 0 && Character.isUpperCase(key.charAt(0))
&& method.getParameterTypes().length == 0) {
if (key.length() == 1) {
key = key.toLowerCase();
} else if (!Character.isUpperCase(key.charAt(1))) {
key = key.substring(0, 1).toLowerCase() + key.substring(1);
}
Object result = method.invoke(bean, (Object[]) null);
if (result != null) {
json.add(name, result);
}
}
}
} catch (Exception ignore) {
}
}
return json;
}
public static JsonObject parse(Map map) {
if (map != null && !map.isEmpty()) {
JsonObject jsonObject = new JsonObject();
Iterator iterator = map.entrySet().iterator();
while (iterator.hasNext()) {
Map.Entry entry = (Map.Entry) iterator.next();
String key = entry.getKey();
Object val = entry.getValue();
jsonObject.add(key, val);
}
return jsonObject;
}
return null;
}
public static Map parseToMap(JsonObject jo) {
Map map = CollectionKit.newHashMap();
if (jo != null) {
List names = jo.names();
for (String name : names) {
map.put(name, (V) jo.get(name));
}
}
return map;
}
public static Map parseToMap(String json) {
return parseToMap(parse(json).asObject());
}
private static String cutOffPointZero(String string) {
if (string.endsWith(".0")) {
return string.substring(0, string.length() - 2);
}
return string;
}
}
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