org.glassfish.json.JsonGeneratorImpl Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including
all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and
Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
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*
* Copyright (c) 2012-2017 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://oss.oracle.com/licenses/CDDL+GPL-1.1
* or LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
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* If you wish your version of this file to be governed by only the CDDL or
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package org.glassfish.json;
import org.glassfish.json.api.BufferPool;
import javax.json.*;
import javax.json.stream.JsonGenerationException;
import javax.json.stream.JsonGenerator;
import java.io.*;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Map;
/**
* @author Jitendra Kotamraju
*/
class JsonGeneratorImpl implements JsonGenerator {
private static final char[] INT_MIN_VALUE_CHARS = "-2147483648".toCharArray();
private static final int[] INT_CHARS_SIZE_TABLE = { 9, 99, 999, 9999, 99999,
999999, 9999999, 99999999, 999999999, Integer.MAX_VALUE };
private static final char [] DIGIT_TENS = {
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
'1', '1', '1', '1', '1', '1', '1', '1', '1', '1',
'2', '2', '2', '2', '2', '2', '2', '2', '2', '2',
'3', '3', '3', '3', '3', '3', '3', '3', '3', '3',
'4', '4', '4', '4', '4', '4', '4', '4', '4', '4',
'5', '5', '5', '5', '5', '5', '5', '5', '5', '5',
'6', '6', '6', '6', '6', '6', '6', '6', '6', '6',
'7', '7', '7', '7', '7', '7', '7', '7', '7', '7',
'8', '8', '8', '8', '8', '8', '8', '8', '8', '8',
'9', '9', '9', '9', '9', '9', '9', '9', '9', '9',
} ;
private static final char [] DIGIT_ONES = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
} ;
/**
* All possible chars for representing a number as a String
*/
private static final char[] DIGITS = {
'0' , '1' , '2' , '3' , '4' , '5' ,
'6' , '7' , '8' , '9'
};
private static enum Scope {
IN_NONE,
IN_OBJECT,
IN_FIELD,
IN_ARRAY
}
private final BufferPool bufferPool;
private final Writer writer;
private Context currentContext = new Context(Scope.IN_NONE);
private final Deque stack = new ArrayDeque<>();
// Using own buffering mechanism as JDK's BufferedWriter uses synchronized
// methods. Also, flushBuffer() is useful when you don't want to actually
// flush the underlying output source
private final char buf[]; // capacity >= INT_MIN_VALUE_CHARS.length
private int len = 0;
JsonGeneratorImpl(Writer writer, BufferPool bufferPool) {
this.writer = writer;
this.bufferPool = bufferPool;
this.buf = bufferPool.take();
}
JsonGeneratorImpl(OutputStream out, BufferPool bufferPool) {
this(out, StandardCharsets.UTF_8, bufferPool);
}
JsonGeneratorImpl(OutputStream out, Charset encoding, BufferPool bufferPool) {
this(new OutputStreamWriter(out, encoding), bufferPool);
}
@Override
public void flush() {
flushBuffer();
try {
writer.flush();
} catch (IOException ioe) {
throw new JsonException(JsonMessages.GENERATOR_FLUSH_IO_ERR(), ioe);
}
}
@Override
public JsonGenerator writeStartObject() {
if (currentContext.scope == Scope.IN_OBJECT) {
throw new JsonGenerationException(JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
if (currentContext.scope == Scope.IN_NONE && !currentContext.first) {
throw new JsonGenerationException(JsonMessages.GENERATOR_ILLEGAL_MULTIPLE_TEXT());
}
writeComma();
writeChar('{');
stack.push(currentContext);
currentContext = new Context(Scope.IN_OBJECT);
return this;
}
@Override
public JsonGenerator writeStartObject(String name) {
if (currentContext.scope != Scope.IN_OBJECT) {
throw new JsonGenerationException(
JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
writeName(name);
writeChar('{');
stack.push(currentContext);
currentContext = new Context(Scope.IN_OBJECT);
return this;
}
private JsonGenerator writeName(String name) {
writeComma();
writeEscapedString(name);
writeColon();
return this;
}
@Override
public JsonGenerator write(String name, String fieldValue) {
if (currentContext.scope != Scope.IN_OBJECT) {
throw new JsonGenerationException(
JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
writeName(name);
writeEscapedString(fieldValue);
return this;
}
@Override
public JsonGenerator write(String name, int value) {
if (currentContext.scope != Scope.IN_OBJECT) {
throw new JsonGenerationException(
JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
writeName(name);
writeInt(value);
return this;
}
@Override
public JsonGenerator write(String name, long value) {
if (currentContext.scope != Scope.IN_OBJECT) {
throw new JsonGenerationException(
JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
writeName(name);
writeString(String.valueOf(value));
return this;
}
@Override
public JsonGenerator write(String name, double value) {
if (currentContext.scope != Scope.IN_OBJECT) {
throw new JsonGenerationException(
JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
if (Double.isInfinite(value) || Double.isNaN(value)) {
throw new NumberFormatException(JsonMessages.GENERATOR_DOUBLE_INFINITE_NAN());
}
writeName(name);
writeString(String.valueOf(value));
return this;
}
@Override
public JsonGenerator write(String name, BigInteger value) {
if (currentContext.scope != Scope.IN_OBJECT) {
throw new JsonGenerationException(
JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
writeName(name);
writeString(String.valueOf(value));
return this;
}
@Override
public JsonGenerator write(String name, BigDecimal value) {
if (currentContext.scope != Scope.IN_OBJECT) {
throw new JsonGenerationException(
JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
writeName(name);
writeString(String.valueOf(value));
return this;
}
@Override
public JsonGenerator write(String name, boolean value) {
if (currentContext.scope != Scope.IN_OBJECT) {
throw new JsonGenerationException(
JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
writeName(name);
writeString(value? "true" : "false");
return this;
}
@Override
public JsonGenerator writeNull(String name) {
if (currentContext.scope != Scope.IN_OBJECT) {
throw new JsonGenerationException(
JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
writeName(name);
writeString("null");
return this;
}
@Override
public JsonGenerator write(JsonValue value) {
checkContextForValue();
switch (value.getValueType()) {
case ARRAY:
JsonArray array = (JsonArray)value;
writeStartArray();
for(JsonValue child: array) {
write(child);
}
writeEnd();
break;
case OBJECT:
JsonObject object = (JsonObject)value;
writeStartObject();
for(Map.Entry member: object.entrySet()) {
write(member.getKey(), member.getValue());
}
writeEnd();
break;
case STRING:
JsonString str = (JsonString)value;
write(str.getString());
break;
case NUMBER:
JsonNumber number = (JsonNumber)value;
writeValue(number.toString());
popFieldContext();
break;
case TRUE:
write(true);
break;
case FALSE:
write(false);
break;
case NULL:
writeNull();
break;
}
return this;
}
@Override
public JsonGenerator writeStartArray() {
if (currentContext.scope == Scope.IN_OBJECT) {
throw new JsonGenerationException(JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
if (currentContext.scope == Scope.IN_NONE && !currentContext.first) {
throw new JsonGenerationException(JsonMessages.GENERATOR_ILLEGAL_MULTIPLE_TEXT());
}
writeComma();
writeChar('[');
stack.push(currentContext);
currentContext = new Context(Scope.IN_ARRAY);
return this;
}
@Override
public JsonGenerator writeStartArray(String name) {
if (currentContext.scope != Scope.IN_OBJECT) {
throw new JsonGenerationException(
JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
writeName(name);
writeChar('[');
stack.push(currentContext);
currentContext = new Context(Scope.IN_ARRAY);
return this;
}
@Override
public JsonGenerator write(String name, JsonValue value) {
if (currentContext.scope != Scope.IN_OBJECT) {
throw new JsonGenerationException(
JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
switch (value.getValueType()) {
case ARRAY:
JsonArray array = (JsonArray)value;
writeStartArray(name);
for(JsonValue child: array) {
write(child);
}
writeEnd();
break;
case OBJECT:
JsonObject object = (JsonObject)value;
writeStartObject(name);
for(Map.Entry member: object.entrySet()) {
write(member.getKey(), member.getValue());
}
writeEnd();
break;
case STRING:
JsonString str = (JsonString)value;
write(name, str.getString());
break;
case NUMBER:
JsonNumber number = (JsonNumber)value;
writeValue(name, number.toString());
break;
case TRUE:
write(name, true);
break;
case FALSE:
write(name, false);
break;
case NULL:
writeNull(name);
break;
}
return this;
}
@Override
public JsonGenerator write(String value) {
checkContextForValue();
writeComma();
writeEscapedString(value);
popFieldContext();
return this;
}
@Override
public JsonGenerator write(int value) {
checkContextForValue();
writeComma();
writeInt(value);
popFieldContext();
return this;
}
@Override
public JsonGenerator write(long value) {
checkContextForValue();
writeValue(String.valueOf(value));
popFieldContext();
return this;
}
@Override
public JsonGenerator write(double value) {
checkContextForValue();
if (Double.isInfinite(value) || Double.isNaN(value)) {
throw new NumberFormatException(JsonMessages.GENERATOR_DOUBLE_INFINITE_NAN());
}
writeValue(String.valueOf(value));
popFieldContext();
return this;
}
@Override
public JsonGenerator write(BigInteger value) {
checkContextForValue();
writeValue(value.toString());
popFieldContext();
return this;
}
private void checkContextForValue() {
if ((!currentContext.first && currentContext.scope != Scope.IN_ARRAY && currentContext.scope != Scope.IN_FIELD)
|| (currentContext.first && currentContext.scope == Scope.IN_OBJECT)) {
throw new JsonGenerationException(
JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
}
@Override
public JsonGenerator write(BigDecimal value) {
checkContextForValue();
writeValue(value.toString());
popFieldContext();
return this;
}
private void popFieldContext() {
if (currentContext.scope == Scope.IN_FIELD) {
currentContext = stack.pop();
}
}
@Override
public JsonGenerator write(boolean value) {
checkContextForValue();
writeComma();
writeString(value ? "true" : "false");
popFieldContext();
return this;
}
@Override
public JsonGenerator writeNull() {
checkContextForValue();
writeComma();
writeString("null");
popFieldContext();
return this;
}
private void writeValue(String value) {
writeComma();
writeString(value);
}
private void writeValue(String name, String value) {
writeComma();
writeEscapedString(name);
writeColon();
writeString(value);
}
@Override
public JsonGenerator writeKey(String name) {
if (currentContext.scope != Scope.IN_OBJECT) {
throw new JsonGenerationException(
JsonMessages.GENERATOR_ILLEGAL_METHOD(currentContext.scope));
}
writeName(name);
stack.push(currentContext);
currentContext = new Context(Scope.IN_FIELD);
currentContext.first = false;
return this;
}
@Override
public JsonGenerator writeEnd() {
if (currentContext.scope == Scope.IN_NONE) {
throw new JsonGenerationException("writeEnd() cannot be called in no context");
}
writeChar(currentContext.scope == Scope.IN_ARRAY ? ']' : '}');
currentContext = stack.pop();
popFieldContext();
return this;
}
protected void writeComma() {
if (!currentContext.first && currentContext.scope != Scope.IN_FIELD) {
writeChar(',');
}
currentContext.first = false;
}
protected void writeColon() {
writeChar(':');
}
private static class Context {
boolean first = true;
final Scope scope;
Context(Scope scope) {
this.scope = scope;
}
}
@Override
public void close() {
if (currentContext.scope != Scope.IN_NONE || currentContext.first) {
throw new JsonGenerationException(JsonMessages.GENERATOR_INCOMPLETE_JSON());
}
flushBuffer();
try {
writer.close();
} catch (IOException ioe) {
throw new JsonException(JsonMessages.GENERATOR_CLOSE_IO_ERR(), ioe);
}
bufferPool.recycle(buf);
}
// begin, end-1 indexes represent characters that need not
// be escaped
//
// XXXssssssssssssXXXXXXXXXXXXXXXXXXXXXXrrrrrrrrrrrrrrXXXXXX
// ^ ^ ^ ^
// | | | |
// begin end begin end
void writeEscapedString(String string) {
writeChar('"');
int len = string.length();
for(int i = 0; i < len; i++) {
int begin = i, end = i;
char c = string.charAt(i);
// find all the characters that need not be escaped
// unescaped = %x20-21 | %x23-5B | %x5D-10FFFF
while(c >= 0x20 && c <= 0x10ffff && c != 0x22 && c != 0x5c) {
i++; end = i;
if (i < len) {
c = string.charAt(i);
} else {
break;
}
}
// Write characters without escaping
if (begin < end) {
writeString(string, begin, end);
if (i == len) {
break;
}
}
switch (c) {
case '"':
case '\\':
writeChar('\\'); writeChar(c);
break;
case '\b':
writeChar('\\'); writeChar('b');
break;
case '\f':
writeChar('\\'); writeChar('f');
break;
case '\n':
writeChar('\\'); writeChar('n');
break;
case '\r':
writeChar('\\'); writeChar('r');
break;
case '\t':
writeChar('\\'); writeChar('t');
break;
default:
String hex = "000" + Integer.toHexString(c);
writeString("\\u" + hex.substring(hex.length() - 4));
}
}
writeChar('"');
}
void writeString(String str, int begin, int end) {
while (begin < end) { // source begin and end indexes
int no = Math.min(buf.length - len, end - begin);
str.getChars(begin, begin + no, buf, len);
begin += no; // Increment source index
len += no; // Increment dest index
if (len >= buf.length) {
flushBuffer();
}
}
}
void writeString(String str) {
writeString(str, 0, str.length());
}
void writeChar(char c) {
if (len >= buf.length) {
flushBuffer();
}
buf[len++] = c;
}
// Not using Integer.toString() since it creates intermediary String
// Also, we want the chars to be copied to our buffer directly
void writeInt(int num) {
int size;
if (num == Integer.MIN_VALUE) {
size = INT_MIN_VALUE_CHARS.length;
} else {
size = (num < 0) ? stringSize(-num) + 1 : stringSize(num);
}
if (len+size >= buf.length) {
flushBuffer();
}
if (num == Integer.MIN_VALUE) {
System.arraycopy(INT_MIN_VALUE_CHARS, 0, buf, len, size);
} else {
fillIntChars(num, buf, len+size);
}
len += size;
}
// flushBuffer writes the buffered contents to writer. But incase of
// byte stream, an OuputStreamWriter is created and that buffers too.
// We may need to call OutputStreamWriter#flushBuffer() using
// reflection if that is really required (commented out below)
void flushBuffer() {
try {
if (len > 0) {
writer.write(buf, 0, len);
len = 0;
}
} catch (IOException ioe) {
throw new JsonException(JsonMessages.GENERATOR_WRITE_IO_ERR(), ioe);
}
}
// private static final Method flushBufferMethod;
// static {
// Method m = null;
// try {
// m = OutputStreamWriter.class.getDeclaredMethod("flushBuffer");
// m.setAccessible(true);
// } catch (Exception e) {
// // no-op
// }
// flushBufferMethod = m;
// }
// void flushBufferOSW() {
// flushBuffer();
// if (writer instanceof OutputStreamWriter) {
// try {
// flushBufferMethod.invoke(writer);
// } catch (Exception e) {
// // no-op
// }
// }
// }
// Requires positive x
private static int stringSize(int x) {
for (int i=0; ; i++)
if (x <= INT_CHARS_SIZE_TABLE[i])
return i+1;
}
/**
* Places characters representing the integer i into the
* character array buf. The characters are placed into
* the buffer backwards starting with the least significant
* digit at the specified index (exclusive), and working
* backwards from there.
*
* Will fail if i == Integer.MIN_VALUE
*/
private static void fillIntChars(int i, char[] buf, int index) {
int q, r;
int charPos = index;
char sign = 0;
if (i < 0) {
sign = '-';
i = -i;
}
// Generate two digits per iteration
while (i >= 65536) {
q = i / 100;
// really: r = i - (q * 100);
r = i - ((q << 6) + (q << 5) + (q << 2));
i = q;
buf [--charPos] = DIGIT_ONES[r];
buf [--charPos] = DIGIT_TENS[r];
}
// Fall thru to fast mode for smaller numbers
// assert(i <= 65536, i);
for (;;) {
q = (i * 52429) >>> (16+3);
r = i - ((q << 3) + (q << 1)); // r = i-(q*10) ...
buf [--charPos] = DIGITS[r];
i = q;
if (i == 0) break;
}
if (sign != 0) {
buf [--charPos] = sign;
}
}
}
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