net.sourceforge.plantuml.json.JsonValue Maven / Gradle / Ivy
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package net.sourceforge.plantuml.json;
import java.io.IOException;
import java.io.Reader;
import java.io.Serializable;
import java.io.StringWriter;
import java.io.Writer;
/**
* Represents a JSON value. This can be a JSON object, an
* array, a number, a
* string, or one of the literals true,
* false, and null.
*
* The literals true, false, and
* null are represented by the constants {@link Json#TRUE},
* {@link Json#FALSE}, and {@link Json#NULL}.
*
*
* JSON objects and arrays are represented by
* the subtypes {@link JsonObject} and {@link JsonArray}. Instances of these
* types can be created using the public constructors of these classes.
*
*
* Instances that represent JSON numbers,
* strings and boolean values can be created
* using the static factory methods {@link Json#value(String)},
* {@link Json#value(long)}, {@link Json#value(double)}, etc.
*
*
* In order to find out whether an instance of this class is of a certain type,
* the methods {@link #isObject()}, {@link #isArray()}, {@link #isString()},
* {@link #isNumber()} etc. can be used.
*
*
* If the type of a JSON value is known, the methods {@link #asObject()},
* {@link #asArray()}, {@link #asString()}, {@link #asInt()}, etc. can be used
* to get this value directly in the appropriate target type.
*
*
* This class is not supposed to be extended by clients.
*
*/
@SuppressWarnings("serial") // use default serial UID
public abstract class JsonValue implements Serializable {
/**
* Represents the JSON literal true.
*
* @deprecated Use Json.TRUE instead
*/
@Deprecated
public static final JsonValue TRUE = new JsonLiteral("true");
/**
* Represents the JSON literal false.
*
* @deprecated Use Json.FALSE instead
*/
@Deprecated
public static final JsonValue FALSE = new JsonLiteral("false");
/**
* Represents the JSON literal null.
*
* @deprecated Use Json.NULL instead
*/
@Deprecated
public static final JsonValue NULL = new JsonLiteral("null");
JsonValue() {
// prevent subclasses outside of this package
}
/**
* Reads a JSON value from the given reader.
*
* 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 the JSON value that has been read
* @throws IOException if an I/O error occurs in the reader
* @throws ParseException if the input is not valid JSON
* @deprecated Use {@link Json#parse(Reader)} instead
*/
@Deprecated
public static JsonValue readFrom(Reader reader) throws IOException {
return Json.parse(reader);
}
/**
* Reads a JSON value from the given string.
*
* @param text the string that contains the JSON value
* @return the JSON value that has been read
* @throws ParseException if the input is not valid JSON
* @deprecated Use {@link Json#parse(String)} instead
*/
@Deprecated
public static JsonValue readFrom(String text) {
return Json.parse(text);
}
/**
* 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
* @deprecated Use Json.value() instead
*/
@Deprecated
public static JsonValue valueOf(int value) {
return Json.value(value);
}
/**
* 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
* @deprecated Use Json.value() instead
*/
@Deprecated
public static JsonValue valueOf(long value) {
return Json.value(value);
}
/**
* 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
* @deprecated Use Json.value() instead
*/
@Deprecated
public static JsonValue valueOf(float value) {
return Json.value(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
* @deprecated Use Json.value() instead
*/
@Deprecated
public static JsonValue valueOf(double value) {
return Json.value(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
* @deprecated Use Json.value() instead
*/
@Deprecated
public static JsonValue valueOf(String string) {
return Json.value(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
* @deprecated Use Json.value() instead
*/
@Deprecated
public static JsonValue valueOf(boolean value) {
return Json.value(value);
}
/**
* Detects whether this value represents a JSON object. If this is the case,
* this value is an instance of {@link JsonObject}.
*
* @return true if this value is an instance of JsonObject
*/
public boolean isObject() {
return false;
}
/**
* Detects whether this value represents a JSON array. If this is the case, this
* value is an instance of {@link JsonArray}.
*
* @return true if this value is an instance of JsonArray
*/
public boolean isArray() {
return false;
}
/**
* Detects whether this value represents a JSON number.
*
* @return true if this value represents a JSON number
*/
public boolean isNumber() {
return false;
}
/**
* Detects whether this value represents a JSON string.
*
* @return true if this value represents a JSON string
*/
public boolean isString() {
return false;
}
/**
* Detects whether this value represents a boolean value.
*
* @return true if this value represents either the JSON literal
* true or false
*/
public boolean isBoolean() {
return false;
}
/**
* Detects whether this value represents the JSON literal true.
*
* @return true if this value represents the JSON literal
* true
*/
public boolean isTrue() {
return false;
}
/**
* Detects whether this value represents the JSON literal false.
*
* @return true if this value represents the JSON literal
* false
*/
public boolean isFalse() {
return false;
}
/**
* Detects whether this value represents the JSON literal null.
*
* @return true if this value represents the JSON literal
* null
*/
public boolean isNull() {
return false;
}
/**
* Returns this JSON value as {@link JsonObject}, assuming that this value
* represents a JSON object. If this is not the case, an exception is thrown.
*
* @return a JSONObject for this value
* @throws UnsupportedOperationException if this value is not a JSON object
*/
public JsonObject asObject() {
throw new UnsupportedOperationException("Not an object: " + toString());
}
/**
* Returns this JSON value as {@link JsonArray}, assuming that this value
* represents a JSON array. If this is not the case, an exception is thrown.
*
* @return a JSONArray for this value
* @throws UnsupportedOperationException if this value is not a JSON array
*/
public JsonArray asArray() {
throw new UnsupportedOperationException("Not an array: " + toString());
}
/**
* Returns this JSON value as an int value, assuming that this
* value represents a JSON number that can be interpreted as Java
* int. If this is not the case, an exception is thrown.
*
* To be interpreted as Java int, the JSON number must neither
* contain an exponent nor a fraction part. Moreover, the number must be in the
* Integer range.
*
*
* @return this value as int
* @throws UnsupportedOperationException if this value is not a JSON number
* @throws NumberFormatException if this JSON number can not be
* interpreted as int value
*/
public int asInt() {
throw new UnsupportedOperationException("Not a number: " + toString());
}
/**
* Returns this JSON value as a long value, assuming that this
* value represents a JSON number that can be interpreted as Java
* long. If this is not the case, an exception is thrown.
*
* To be interpreted as Java long, the JSON number must neither
* contain an exponent nor a fraction part. Moreover, the number must be in the
* Long range.
*
*
* @return this value as long
* @throws UnsupportedOperationException if this value is not a JSON number
* @throws NumberFormatException if this JSON number can not be
* interpreted as long value
*/
public long asLong() {
throw new UnsupportedOperationException("Not a number: " + toString());
}
/**
* Returns this JSON value as a float value, assuming that this
* value represents a JSON number. If this is not the case, an exception is
* thrown.
*
* If the JSON number is out of the Float range,
* {@link Float#POSITIVE_INFINITY} or {@link Float#NEGATIVE_INFINITY} is
* returned.
*
*
* @return this value as float
* @throws UnsupportedOperationException if this value is not a JSON number
*/
public float asFloat() {
throw new UnsupportedOperationException("Not a number: " + toString());
}
/**
* Returns this JSON value as a double value, assuming that this
* value represents a JSON number. If this is not the case, an exception is
* thrown.
*
* If the JSON number is out of the Double range,
* {@link Double#POSITIVE_INFINITY} or {@link Double#NEGATIVE_INFINITY} is
* returned.
*
*
* @return this value as double
* @throws UnsupportedOperationException if this value is not a JSON number
*/
public double asDouble() {
throw new UnsupportedOperationException("Not a number: " + toString());
}
/**
* Returns this JSON value as String, assuming that this value represents a JSON
* string. If this is not the case, an exception is thrown.
*
* @return the string represented by this value
* @throws UnsupportedOperationException if this value is not a JSON string
*/
public String asString() {
throw new UnsupportedOperationException("Not a string: " + toString());
}
/**
* Returns this JSON value as a boolean value, assuming that this
* value is either true or false. If this is not the
* case, an exception is thrown.
*
* @return this value as boolean
* @throws UnsupportedOperationException if this value is neither
* true or false
*/
public boolean asBoolean() {
throw new UnsupportedOperationException("Not a boolean: " + toString());
}
/**
* Writes the JSON representation of this value to the given writer in its
* minimal form, without any additional whitespace.
*
* Writing performance can be improved by using a {@link java.io.BufferedWriter
* BufferedWriter}.
*
*
* @param writer the writer to write this value to
* @throws IOException if an I/O error occurs in the writer
*/
public void writeTo(Writer writer) throws IOException {
writeTo(writer, WriterConfig.MINIMAL);
}
/**
* Writes the JSON representation of this value to the given writer using the
* given formatting.
*
* Writing performance can be improved by using a {@link java.io.BufferedWriter
* BufferedWriter}.
*
*
* @param writer the writer to write this value to
* @param config a configuration that controls the formatting or
* null for the minimal form
* @throws IOException if an I/O error occurs in the writer
*/
public void writeTo(Writer writer, WriterConfig config) throws IOException {
if (writer == null) {
throw new NullPointerException("writer is null");
}
if (config == null) {
throw new NullPointerException("config is null");
}
WritingBuffer buffer = new WritingBuffer(writer, 128);
write(config.createWriter(buffer));
buffer.flush();
}
/**
* Returns the JSON string for this value in its minimal form, without any
* additional whitespace. The result is guaranteed to be a valid input for the
* method {@link Json#parse(String)} and to create a value that is
* equal to this object.
*
* @return a JSON string that represents this value
*/
@Override
public String toString() {
return toString(WriterConfig.MINIMAL);
}
/**
* Returns the JSON string for this value using the given formatting.
*
* @param config a configuration that controls the formatting or
* null for the minimal form
* @return a JSON string that represents this value
*/
public String toString(WriterConfig config) {
StringWriter writer = new StringWriter();
try {
writeTo(writer, config);
} catch (IOException exception) {
// StringWriter does not throw IOExceptions
throw new RuntimeException(exception);
}
return writer.toString();
}
/**
* Indicates whether some other object is "equal to" this one according to the
* contract specified in {@link Object#equals(Object)}.
*
* Two JsonValues are considered equal if and only if they represent the same
* JSON text. As a consequence, two given JsonObjects may be different even
* though they contain the same set of names with the same values, but in a
* different order.
*
*
* @param object the reference object with which to compare
* @return true if this object is the same as the object argument; false
* otherwise
*/
@Override
public boolean equals(Object object) {
return super.equals(object);
}
@Override
public int hashCode() {
return super.hashCode();
}
abstract void write(JsonWriter writer) throws IOException;
/**
* Added for PlantUML.
* The default implementation works for immutable objects.
* Must be overriden for JsonArray and JsonObject.
*/
public JsonValue cloneMe() {
return this;
}
}