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With inspiration from other libraries
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2013 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://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/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 packager/legal/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 org.glassfish.json.api.BufferPool;
import javax.json.*;
import javax.json.stream.JsonParser;
import java.io.InputStream;
import java.io.Reader;
import java.math.BigDecimal;
import java.nio.charset.Charset;
/**
* JsonReader impl using parser and builders.
*
* @author Jitendra Kotamraju
*/
class JsonReaderImpl implements JsonReader {
private final JsonParserImpl parser;
private boolean readDone;
private final BufferPool bufferPool;
JsonReaderImpl(Reader reader, BufferPool bufferPool) {
parser = new JsonParserImpl(reader, bufferPool);
this.bufferPool = bufferPool;
}
JsonReaderImpl(InputStream in, BufferPool bufferPool) {
parser = new JsonParserImpl(in, bufferPool);
this.bufferPool = bufferPool;
}
JsonReaderImpl(InputStream in, Charset charset, BufferPool bufferPool) {
parser = new JsonParserImpl(in, charset, bufferPool);
this.bufferPool = bufferPool;
}
@Override
public JsonStructure read() {
if (readDone) {
throw new IllegalStateException(JsonMessages.READER_READ_ALREADY_CALLED());
}
readDone = true;
if (parser.hasNext()) {
JsonParser.Event e = parser.next();
if (e == JsonParser.Event.START_ARRAY) {
return readArray(new JsonArrayBuilderImpl(bufferPool));
} else if (e == JsonParser.Event.START_OBJECT) {
return readObject(new JsonObjectBuilderImpl(bufferPool));
}
}
throw new JsonException("Internal Error");
}
@Override
public JsonObject readObject() {
if (readDone) {
throw new IllegalStateException(JsonMessages.READER_READ_ALREADY_CALLED());
}
readDone = true;
if (parser.hasNext()) {
JsonParser.Event e = parser.next();
if (e == JsonParser.Event.START_OBJECT) {
return readObject(new JsonObjectBuilderImpl(bufferPool));
} else if (e == JsonParser.Event.START_ARRAY) {
throw new JsonException(JsonMessages.READER_EXPECTED_OBJECT_GOT_ARRAY());
}
}
throw new JsonException("Internal Error");
}
@Override
public JsonArray readArray() {
if (readDone) {
throw new IllegalStateException(JsonMessages.READER_READ_ALREADY_CALLED());
}
readDone = true;
if (parser.hasNext()) {
JsonParser.Event e = parser.next();
if (e == JsonParser.Event.START_ARRAY) {
return readArray(new JsonArrayBuilderImpl(bufferPool));
} else if (e == JsonParser.Event.START_OBJECT) {
throw new JsonException(JsonMessages.READER_EXPECTED_ARRAY_GOT_OBJECT());
}
}
throw new JsonException("Internal Error");
}
@Override
public void close() {
readDone = true;
parser.close();
}
private JsonArray readArray(JsonArrayBuilder builder) {
while(parser.hasNext()) {
JsonParser.Event e = parser.next();
switch (e) {
case START_ARRAY:
JsonArray array = readArray(new JsonArrayBuilderImpl(bufferPool));
builder.add(array);
break;
case START_OBJECT:
JsonObject object = readObject(new JsonObjectBuilderImpl(bufferPool));
builder.add(object);
break;
case VALUE_STRING:
builder.add(parser.getString());
break;
case VALUE_NUMBER:
if (parser.isDefinitelyInt()) {
builder.add(parser.getInt());
} else {
builder.add(parser.getBigDecimal());
}
break;
case VALUE_TRUE:
builder.add(JsonValue.TRUE);
break;
case VALUE_FALSE:
builder.add(JsonValue.FALSE);
break;
case VALUE_NULL:
builder.addNull();
break;
case END_ARRAY:
return builder.build();
default:
throw new JsonException("Internal Error");
}
}
throw new JsonException("Internal Error");
}
private JsonObject readObject(JsonObjectBuilder builder) {
String key = null;
while(parser.hasNext()) {
JsonParser.Event e = parser .next();
switch (e) {
case START_ARRAY:
JsonArray array = readArray(new JsonArrayBuilderImpl(bufferPool));
builder.add(key, array);
break;
case START_OBJECT:
JsonObject object = readObject(new JsonObjectBuilderImpl(bufferPool));
builder.add(key, object);
break;
case KEY_NAME:
key = parser.getString();
break;
case VALUE_STRING:
builder.add(key, parser.getString());
break;
case VALUE_NUMBER:
if (parser.isDefinitelyInt()) {
builder.add(key, parser.getInt());
} else {
builder.add(key, parser.getBigDecimal());
}
break;
case VALUE_TRUE:
builder.add(key, JsonValue.TRUE);
break;
case VALUE_FALSE:
builder.add(key, JsonValue.FALSE);
break;
case VALUE_NULL:
builder.addNull(key);
break;
case END_OBJECT:
return builder.build();
default:
throw new JsonException("Internal Error");
}
}
throw new JsonException("Internal Error");
}
}