org.glassfish.json.JsonParserImpl 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).
/*
* Copyright (c) 2012, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.json;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.math.BigDecimal;
import java.nio.charset.Charset;
import java.util.AbstractMap;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.function.Consumer;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import javax.json.JsonArray;
import javax.json.JsonArrayBuilder;
import javax.json.JsonException;
import javax.json.JsonObject;
import javax.json.JsonObjectBuilder;
import javax.json.JsonValue;
import javax.json.stream.JsonLocation;
import javax.json.stream.JsonParser;
import javax.json.stream.JsonParser.Event;
import javax.json.stream.JsonParsingException;
import org.glassfish.json.JsonTokenizer.JsonToken;
import org.glassfish.json.api.BufferPool;
/**
* JSON parser implementation. NoneContext, ArrayContext, ObjectContext is used
* to go to next parser state.
*
* @author Jitendra Kotamraju
* @author Kin-man Chung
*/
public class JsonParserImpl implements JsonParser {
private final BufferPool bufferPool;
private Context currentContext = new NoneContext();
private Event currentEvent;
private final Stack stack = new Stack();
private final JsonTokenizer tokenizer;
public JsonParserImpl(Reader reader, BufferPool bufferPool) {
this.bufferPool = bufferPool;
tokenizer = new JsonTokenizer(reader, bufferPool);
}
public JsonParserImpl(InputStream in, BufferPool bufferPool) {
this.bufferPool = bufferPool;
UnicodeDetectingInputStream uin = new UnicodeDetectingInputStream(in);
tokenizer = new JsonTokenizer(new InputStreamReader(uin, uin.getCharset()), bufferPool);
}
public JsonParserImpl(InputStream in, Charset encoding, BufferPool bufferPool) {
this.bufferPool = bufferPool;
tokenizer = new JsonTokenizer(new InputStreamReader(in, encoding), bufferPool);
}
@Override
public String getString() {
if (currentEvent == Event.KEY_NAME || currentEvent == Event.VALUE_STRING
|| currentEvent == Event.VALUE_NUMBER) {
return tokenizer.getValue();
}
throw new IllegalStateException(
JsonMessages.PARSER_GETSTRING_ERR(currentEvent));
}
@Override
public boolean isIntegralNumber() {
if (currentEvent != Event.VALUE_NUMBER) {
throw new IllegalStateException(
JsonMessages.PARSER_ISINTEGRALNUMBER_ERR(currentEvent));
}
return tokenizer.isIntegral();
}
@Override
public int getInt() {
if (currentEvent != Event.VALUE_NUMBER) {
throw new IllegalStateException(
JsonMessages.PARSER_GETINT_ERR(currentEvent));
}
return tokenizer.getInt();
}
boolean isDefinitelyInt() {
return tokenizer.isDefinitelyInt();
}
boolean isDefinitelyLong() {
return tokenizer.isDefinitelyLong();
}
@Override
public long getLong() {
if (currentEvent != Event.VALUE_NUMBER) {
throw new IllegalStateException(
JsonMessages.PARSER_GETLONG_ERR(currentEvent));
}
return tokenizer.getLong();
}
@Override
public BigDecimal getBigDecimal() {
if (currentEvent != Event.VALUE_NUMBER) {
throw new IllegalStateException(
JsonMessages.PARSER_GETBIGDECIMAL_ERR(currentEvent));
}
return tokenizer.getBigDecimal();
}
@Override
public JsonArray getArray() {
if (currentEvent != Event.START_ARRAY) {
throw new IllegalStateException(
JsonMessages.PARSER_GETARRAY_ERR(currentEvent));
}
return getArray(new JsonArrayBuilderImpl(bufferPool));
}
@Override
public JsonObject getObject() {
if (currentEvent != Event.START_OBJECT) {
throw new IllegalStateException(
JsonMessages.PARSER_GETOBJECT_ERR(currentEvent));
}
return getObject(new JsonObjectBuilderImpl(bufferPool));
}
@Override
public JsonValue getValue() {
switch (currentEvent) {
case START_ARRAY:
return getArray(new JsonArrayBuilderImpl(bufferPool));
case START_OBJECT:
return getObject(new JsonObjectBuilderImpl(bufferPool));
case KEY_NAME:
case VALUE_STRING:
return new JsonStringImpl(getString());
case VALUE_NUMBER:
if (isDefinitelyInt()) {
return JsonNumberImpl.getJsonNumber(getInt());
} else if (isDefinitelyLong()) {
return JsonNumberImpl.getJsonNumber(getLong());
}
return JsonNumberImpl.getJsonNumber(getBigDecimal());
case VALUE_TRUE:
return JsonValue.TRUE;
case VALUE_FALSE:
return JsonValue.FALSE;
case VALUE_NULL:
return JsonValue.NULL;
case END_ARRAY:
case END_OBJECT:
default:
throw new IllegalStateException(JsonMessages.PARSER_GETVALUE_ERR(currentEvent));
}
}
@Override
public Stream getArrayStream() {
if (currentEvent != Event.START_ARRAY) {
throw new IllegalStateException(
JsonMessages.PARSER_GETARRAY_ERR(currentEvent));
}
Spliterator spliterator =
new Spliterators.AbstractSpliterator(Long.MAX_VALUE, Spliterator.ORDERED) {
@Override
public Spliterator trySplit() {
return null;
}
@Override
public boolean tryAdvance(Consumer action) {
if (action == null) {
throw new NullPointerException();
}
if (! hasNext()) {
return false;
}
if (next() == JsonParser.Event.END_ARRAY) {
return false;
}
action.accept(getValue());
return true;
}
};
return StreamSupport.stream(spliterator, false);
}
@Override
public Stream> getObjectStream() {
if (currentEvent != Event.START_OBJECT) {
throw new IllegalStateException(
JsonMessages.PARSER_GETOBJECT_ERR(currentEvent));
}
Spliterator> spliterator =
new Spliterators.AbstractSpliterator>(Long.MAX_VALUE, Spliterator.ORDERED) {
@Override
public Spliterator> trySplit() {
return null;
}
@Override
public boolean tryAdvance(Consumer> action) {
if (action == null) {
throw new NullPointerException();
}
if (! hasNext()) {
return false;
}
JsonParser.Event e = next();
if (e == JsonParser.Event.END_OBJECT) {
return false;
}
if (e != JsonParser.Event.KEY_NAME) {
throw new JsonException(JsonMessages.INTERNAL_ERROR());
}
String key = getString();
if (! hasNext()) {
throw new JsonException(JsonMessages.INTERNAL_ERROR());
}
next();
JsonValue value = getValue();
action.accept(new AbstractMap.SimpleImmutableEntry<>(key, value));
return true;
}
};
return StreamSupport.stream(spliterator, false);
}
@Override
public Stream getValueStream() {
if (! (currentContext instanceof NoneContext)) {
throw new IllegalStateException(
JsonMessages.PARSER_GETVALUESTREAM_ERR());
}
Spliterator spliterator =
new Spliterators.AbstractSpliterator(Long.MAX_VALUE, Spliterator.ORDERED) {
@Override
public Spliterator trySplit() {
return null;
}
@Override
public boolean tryAdvance(Consumer action) {
if (action == null) {
throw new NullPointerException();
}
if (! hasNext()) {
return false;
}
next();
action.accept(getValue());
return true;
}
};
return StreamSupport.stream(spliterator, false);
}
@Override
public void skipArray() {
if (currentEvent == Event.START_ARRAY) {
currentContext.skip();
currentContext = stack.pop();
currentEvent = Event.END_ARRAY;
}
}
@Override
public void skipObject() {
if (currentEvent == Event.START_OBJECT) {
currentContext.skip();
currentContext = stack.pop();
currentEvent = Event.END_OBJECT;
}
}
private JsonArray getArray(JsonArrayBuilder builder) {
while(hasNext()) {
JsonParser.Event e = next();
if (e == JsonParser.Event.END_ARRAY) {
return builder.build();
}
builder.add(getValue());
}
throw parsingException(JsonToken.EOF, "[CURLYOPEN, SQUAREOPEN, STRING, NUMBER, TRUE, FALSE, NULL, SQUARECLOSE]");
}
private JsonObject getObject(JsonObjectBuilder builder) {
while(hasNext()) {
JsonParser.Event e = next();
if (e == JsonParser.Event.END_OBJECT) {
return builder.build();
}
String key = getString();
next();
builder.add(key, getValue());
}
throw parsingException(JsonToken.EOF, "[STRING, CURLYCLOSE]");
}
@Override
public JsonLocation getLocation() {
return tokenizer.getLocation();
}
public JsonLocation getLastCharLocation() {
return tokenizer.getLastCharLocation();
}
@Override
public boolean hasNext() {
if (stack.isEmpty() && (currentEvent != null && currentEvent.compareTo(Event.KEY_NAME) > 0)) {
JsonToken token = tokenizer.nextToken();
if (token != JsonToken.EOF) {
throw new JsonParsingException(JsonMessages.PARSER_EXPECTED_EOF(token),
getLastCharLocation());
}
return false;
} else if (!stack.isEmpty() && !tokenizer.hasNextToken()) {
currentEvent = currentContext.getNextEvent();
return false;
}
return true;
}
@Override
public Event next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
return currentEvent = currentContext.getNextEvent();
}
@Override
public void close() {
try {
tokenizer.close();
} catch (IOException e) {
throw new JsonException(JsonMessages.PARSER_TOKENIZER_CLOSE_IO(), e);
}
}
// Using the optimized stack impl as we don't require other things
// like iterator etc.
private static final class Stack {
private Context head;
private void push(Context context) {
context.next = head;
head = context;
}
private Context pop() {
if (head == null) {
throw new NoSuchElementException();
}
Context temp = head;
head = head.next;
return temp;
}
private Context peek() {
return head;
}
private boolean isEmpty() {
return head == null;
}
}
private abstract class Context {
Context next;
abstract Event getNextEvent();
abstract void skip();
}
private final class NoneContext extends Context {
@Override
public Event getNextEvent() {
// Handle 1. { 2. [ 3. value
JsonToken token = tokenizer.nextToken();
if (token == JsonToken.CURLYOPEN) {
stack.push(currentContext);
currentContext = new ObjectContext();
return Event.START_OBJECT;
} else if (token == JsonToken.SQUAREOPEN) {
stack.push(currentContext);
currentContext = new ArrayContext();
return Event.START_ARRAY;
} else if (token.isValue()) {
return token.getEvent();
}
throw parsingException(token, "[CURLYOPEN, SQUAREOPEN, STRING, NUMBER, TRUE, FALSE, NULL]");
}
@Override
void skip() {
// no-op
}
}
private JsonParsingException parsingException(JsonToken token, String expectedTokens) {
JsonLocation location = getLastCharLocation();
return new JsonParsingException(
JsonMessages.PARSER_INVALID_TOKEN(token, location, expectedTokens), location);
}
private final class ObjectContext extends Context {
private boolean firstValue = true;
/*
* Some more things could be optimized. For example, instead
* tokenizer.nextToken(), one could use tokenizer.matchColonToken() to
* match ':'. That might optimize a bit, but will fragment nextToken().
* I think the current one is more readable.
*
*/
@Override
public Event getNextEvent() {
// Handle 1. } 2. name:value 3. ,name:value
JsonToken token = tokenizer.nextToken();
if (token == JsonToken.EOF) {
switch (currentEvent) {
case START_OBJECT:
throw parsingException(token, "[STRING, CURLYCLOSE]");
case KEY_NAME:
throw parsingException(token, "[COLON]");
default:
throw parsingException(token, "[COMMA, CURLYCLOSE]");
}
} else if (currentEvent == Event.KEY_NAME) {
// Handle 1. :value
if (token != JsonToken.COLON) {
throw parsingException(token, "[COLON]");
}
token = tokenizer.nextToken();
if (token.isValue()) {
return token.getEvent();
} else if (token == JsonToken.CURLYOPEN) {
stack.push(currentContext);
currentContext = new ObjectContext();
return Event.START_OBJECT;
} else if (token == JsonToken.SQUAREOPEN) {
stack.push(currentContext);
currentContext = new ArrayContext();
return Event.START_ARRAY;
}
throw parsingException(token, "[CURLYOPEN, SQUAREOPEN, STRING, NUMBER, TRUE, FALSE, NULL]");
} else {
// Handle 1. } 2. name 3. ,name
if (token == JsonToken.CURLYCLOSE) {
currentContext = stack.pop();
return Event.END_OBJECT;
}
if (firstValue) {
firstValue = false;
} else {
if (token != JsonToken.COMMA) {
throw parsingException(token, "[COMMA]");
}
token = tokenizer.nextToken();
}
if (token == JsonToken.STRING) {
return Event.KEY_NAME;
}
throw parsingException(token, "[STRING]");
}
}
@Override
void skip() {
JsonToken token;
int depth = 1;
do {
token = tokenizer.nextToken();
switch (token) {
case CURLYCLOSE:
depth--;
break;
case CURLYOPEN:
depth++;
break;
}
} while (!(token == JsonToken.CURLYCLOSE && depth == 0));
}
}
private final class ArrayContext extends Context {
private boolean firstValue = true;
// Handle 1. ] 2. value 3. ,value
@Override
public Event getNextEvent() {
JsonToken token = tokenizer.nextToken();
if (token == JsonToken.EOF) {
switch (currentEvent) {
case START_ARRAY:
throw parsingException(token, "[CURLYOPEN, SQUAREOPEN, STRING, NUMBER, TRUE, FALSE, NULL]");
default:
throw parsingException(token, "[COMMA, CURLYCLOSE]");
}
}
if (token == JsonToken.SQUARECLOSE) {
currentContext = stack.pop();
return Event.END_ARRAY;
}
if (firstValue) {
firstValue = false;
} else {
if (token != JsonToken.COMMA) {
throw parsingException(token, "[COMMA]");
}
token = tokenizer.nextToken();
}
if (token.isValue()) {
return token.getEvent();
} else if (token == JsonToken.CURLYOPEN) {
stack.push(currentContext);
currentContext = new ObjectContext();
return Event.START_OBJECT;
} else if (token == JsonToken.SQUAREOPEN) {
stack.push(currentContext);
currentContext = new ArrayContext();
return Event.START_ARRAY;
}
throw parsingException(token, "[CURLYOPEN, SQUAREOPEN, STRING, NUMBER, TRUE, FALSE, NULL]");
}
@Override
void skip() {
JsonToken token;
int depth = 1;
do {
token = tokenizer.nextToken();
switch (token) {
case SQUARECLOSE:
depth--;
break;
case SQUAREOPEN:
depth++;
break;
}
} while (!(token == JsonToken.SQUARECLOSE && depth == 0));
}
}
}
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