org.glassfish.json.JsonParserImpl Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of javax.json Show documentation
Show all versions of javax.json Show documentation
Default provider for JSR 374:Java API for Processing JSON
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* 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:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
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();
}
}
@Override
public void skipObject() {
if (currentEvent == Event.START_OBJECT) {
currentContext.skip();
currentContext = stack.pop();
}
}
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() {
return tokenizer.hasNextToken();
}
@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 (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.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));
}
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy