/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.drill.exec.ref.rse;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.drill.exec.ref.rops.DataWriter;
import com.fasterxml.jackson.core.JsonEncoding;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
public class JSONDataWriter implements DataWriter{
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(JSONDataWriter.class);
private final JsonGenerator g;
// private CharSequence transientName;
public JSONDataWriter(OutputStream out) throws IOException{
JsonFactory f = new JsonFactory();
this.g = f.createJsonGenerator(out, JsonEncoding.UTF8);
this.g.useDefaultPrettyPrinter();
}
private String s(CharSequence seq) {
String s = (seq instanceof String) ? (String) seq : seq.toString();
return s;
}
@Override
public void startRecord() throws IOException {
}
@Override
public void writeArrayStart(int length) throws IOException {
g.writeStartArray();
}
@Override
public void writeArrayElementStart() throws IOException {
}
@Override
public void writeArrayElementEnd() throws IOException {
}
@Override
public void writeArrayEnd() throws IOException {
g.writeEndArray();
}
@Override
public void writeMapStart() throws IOException {
g.writeStartObject();
}
@Override
public void writeMapKey(CharSequence seq) throws IOException {
g.writeFieldName(s(seq));
}
@Override
public void writeMapValueStart() throws IOException {
}
@Override
public void writeMapValueEnd() throws IOException {
}
@Override
public void writeMapEnd() throws IOException {
g.writeEndObject();
}
@Override
public void writeBoolean(boolean b) throws IOException {
g.writeBoolean(b);
}
@Override
public void writeSInt32(int value) throws IOException {
g.writeNumber(value);
}
@Override
public void writeSInt64(long value) throws IOException {
g.writeNumber(value);
}
@Override
public void writeBytes(byte[] bytes) throws IOException {
g.writeBinary(bytes);
}
@Override
public void writeSFloat64(double value) throws IOException {
g.writeNumber(value);
}
@Override
public void writeSFloat32(float value) throws IOException {
g.writeNumber(value);
}
@Override
public void writeNullValue() throws IOException {
g.writeNull();
}
@Override
public void writeCharSequence(CharSequence value) throws IOException {
g.writeString(s(value));
}
@Override
public void endRecord() throws IOException {
g.writeRawValue("\n");
}
public void finish() throws IOException{
g.close();
}
}