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/*
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*
* Copyright (c) 2013-2017 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:
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* 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
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package org.glassfish.json;
import org.glassfish.json.api.BufferPool;
import javax.json.*;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Map;
/**
* JsonWriter impl using generator.
*
* @author Jitendra Kotamraju
*/
class JsonWriterImpl implements JsonWriter {
private final JsonGeneratorImpl generator;
private boolean writeDone;
private final NoFlushOutputStream os;
JsonWriterImpl(Writer writer, BufferPool bufferPool) {
this(writer, false, bufferPool);
}
JsonWriterImpl(Writer writer, boolean prettyPrinting, BufferPool bufferPool) {
generator = prettyPrinting
? new JsonPrettyGeneratorImpl(writer, bufferPool)
: new JsonGeneratorImpl(writer, bufferPool);
os = null;
}
JsonWriterImpl(OutputStream out, BufferPool bufferPool) {
this(out, StandardCharsets.UTF_8, false, bufferPool);
}
JsonWriterImpl(OutputStream out, boolean prettyPrinting, BufferPool bufferPool) {
this(out, StandardCharsets.UTF_8, prettyPrinting, bufferPool);
}
JsonWriterImpl(OutputStream out, Charset charset,
boolean prettyPrinting, BufferPool bufferPool) {
// Decorating the given stream, so that buffered contents can be
// written without actually flushing the stream.
this.os = new NoFlushOutputStream(out);
generator = prettyPrinting
? new JsonPrettyGeneratorImpl(os, charset, bufferPool)
: new JsonGeneratorImpl(os, charset, bufferPool);
}
@Override
public void writeArray(JsonArray array) {
if (writeDone) {
throw new IllegalStateException(JsonMessages.WRITER_WRITE_ALREADY_CALLED());
}
writeDone = true;
generator.writeStartArray();
for(JsonValue value : array) {
generator.write(value);
}
generator.writeEnd();
// Flush the generator's buffered contents. This won't work for byte
// streams as intermediary OutputStreamWriter buffers.
generator.flushBuffer();
// Flush buffered contents but not the byte stream. generator.flush()
// does OutputStreamWriter#flushBuffer (package private) and underlying
// byte stream#flush(). Here underlying stream's flush() is no-op.
if (os != null) {
generator.flush();
}
}
@Override
public void writeObject(JsonObject object) {
if (writeDone) {
throw new IllegalStateException(JsonMessages.WRITER_WRITE_ALREADY_CALLED());
}
writeDone = true;
generator.writeStartObject();
for(Map.Entry e : object.entrySet()) {
generator.write(e.getKey(), e.getValue());
}
generator.writeEnd();
// Flush the generator's buffered contents. This won't work for byte
// streams as intermediary OutputStreamWriter buffers.
generator.flushBuffer();
// Flush buffered contents but not the byte stream. generator.flush()
// does OutputStreamWriter#flushBuffer (package private) and underlying
// byte stream#flush(). Here underlying stream's flush() is no-op.
if (os != null) {
generator.flush();
}
}
@Override
public void write(JsonStructure value) {
if (value instanceof JsonArray) {
writeArray((JsonArray)value);
} else {
writeObject((JsonObject)value);
}
}
@Override
public void write(JsonValue value) {
switch (value.getValueType()) {
case OBJECT:
writeObject((JsonObject) value);
return;
case ARRAY:
writeArray((JsonArray) value);
return;
default:
if (writeDone) {
throw new IllegalStateException(JsonMessages.WRITER_WRITE_ALREADY_CALLED());
}
writeDone = true;
generator.write(value);
generator.flushBuffer();
if (os != null) {
generator.flush();
}
}
}
@Override
public void close() {
writeDone = true;
generator.close();
}
private static final class NoFlushOutputStream extends FilterOutputStream {
public NoFlushOutputStream(OutputStream out) {
super(out);
}
@Override
public void write(byte b[], int off, int len) throws IOException {
out.write(b, off ,len);
}
@Override
public void flush() {
// no-op
}
}
}