/**
* 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.vector.complex.fn;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.drill.common.types.TypeProtos.DataMode;
import org.apache.drill.common.types.TypeProtos.MinorType;
import org.apache.drill.exec.vector.complex.reader.FieldReader;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonGenerator;
import org.apache.drill.exec.vector.complex.writer.BaseWriter.ComplexWriter;
import org.apache.drill.exec.vector.complex.writer.BaseWriter.MapWriter;
public class JsonWriter {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(JsonWriter.class);
private final JsonFactory factory = new JsonFactory();
private final JsonOutput gen;
public JsonWriter(OutputStream out, boolean pretty, boolean useExtendedOutput) throws IOException{
JsonGenerator writer = factory.createJsonGenerator(out);
if(pretty){
writer = writer.useDefaultPrettyPrinter();
}
if(useExtendedOutput){
gen = new ExtendedJsonOutput(writer);
}else{
gen = new BasicJsonOutput(writer);
}
}
public JsonWriter(JsonOutput gen) {
this.gen = gen;
}
public void write(FieldReader reader) throws JsonGenerationException, IOException{
writeValue(reader);
gen.flush();
}
private void writeValue(FieldReader reader) throws JsonGenerationException, IOException{
final DataMode m = reader.getType().getMode();
final MinorType mt = reader.getType().getMinorType();
switch(m){
case OPTIONAL:
case REQUIRED:
switch (mt) {
case FLOAT4:
gen.writeFloat(reader);
break;
case FLOAT8:
gen.writeDouble(reader);
break;
case INT:
gen.writeInt(reader);
break;
case SMALLINT:
gen.writeSmallInt(reader);
break;
case TINYINT:
gen.writeTinyInt(reader);
break;
case BIGINT:
gen.writeBigInt(reader);
break;
case BIT:
gen.writeBoolean(reader);
break;
case DATE:
gen.writeDate(reader);
break;
case TIME:
gen.writeTime(reader);
break;
case TIMESTAMP:
gen.writeTimestamp(reader);
break;
case INTERVALYEAR:
case INTERVALDAY:
case INTERVAL:
gen.writeInterval(reader);
break;
case DECIMAL28DENSE:
case DECIMAL28SPARSE:
case DECIMAL38DENSE:
case DECIMAL38SPARSE:
case DECIMAL9:
case DECIMAL18:
gen.writeDecimal(reader);
break;
case LIST:
// this is a pseudo class, doesn't actually contain the real reader so we have to drop down.
gen.writeStartArray();
while (reader.next()) {
writeValue(reader.reader());
}
gen.writeEndArray();
break;
case MAP:
gen.writeStartObject();
if (reader.isSet()) {
for(String name : reader){
FieldReader childReader = reader.reader(name);
if(childReader.isSet()){
gen.writeFieldName(name);
writeValue(childReader);
}
}
}
gen.writeEndObject();
break;
case NULL:
case LATE:
gen.writeUntypedNull();
break;
case VAR16CHAR:
gen.writeVar16Char(reader);
break;
case VARBINARY:
gen.writeBinary(reader);
break;
case VARCHAR:
gen.writeVarChar(reader);
break;
}
break;
case REPEATED:
gen.writeStartArray();
switch (mt) {
case FLOAT4:
for(int i = 0; i < reader.size(); i++){
gen.writeFloat(i, reader);
}
break;
case FLOAT8:
for(int i = 0; i < reader.size(); i++){
gen.writeDouble(i, reader);
}
break;
case INT:
for(int i = 0; i < reader.size(); i++){
gen.writeInt(i, reader);
}
break;
case SMALLINT:
for(int i = 0; i < reader.size(); i++){
gen.writeSmallInt(i, reader);
}
break;
case TINYINT:
for(int i = 0; i < reader.size(); i++){
gen.writeTinyInt(i, reader);
}
break;
case BIGINT:
for(int i = 0; i < reader.size(); i++){
gen.writeBigInt(i, reader);
}
break;
case BIT:
for(int i = 0; i < reader.size(); i++){
gen.writeBoolean(i, reader);
}
break;
case DATE:
for(int i = 0; i < reader.size(); i++){
gen.writeDate(i, reader);
}
break;
case TIME:
for(int i = 0; i < reader.size(); i++){
gen.writeTime(i, reader);
}
break;
case TIMESTAMP:
for(int i = 0; i < reader.size(); i++){
gen.writeTimestamp(i, reader);
}
break;
case INTERVALYEAR:
case INTERVALDAY:
case INTERVAL:
for(int i = 0; i < reader.size(); i++){
gen.writeInterval(i, reader);
}
break;
case DECIMAL28DENSE:
case DECIMAL28SPARSE:
case DECIMAL38DENSE:
case DECIMAL38SPARSE:
case DECIMAL9:
case DECIMAL18:
for(int i = 0; i < reader.size(); i++){
gen.writeDecimal(i, reader);
}
break;
case LIST:
for(int i = 0; i < reader.size(); i++){
while(reader.next()){
writeValue(reader.reader());
}
}
break;
case MAP:
while(reader.next()){
gen.writeStartObject();
for(String name : reader){
FieldReader mapField = reader.reader(name);
if(mapField.isSet()){
gen.writeFieldName(name);
writeValue(mapField);
}
}
gen.writeEndObject();
}
break;
case NULL:
break;
case VAR16CHAR:
for(int i = 0; i < reader.size(); i++){
gen.writeVar16Char(i, reader);
}
break;
case VARBINARY:
for(int i = 0; i < reader.size(); i++){
gen.writeBinary(i, reader);
}
break;
case VARCHAR:
for(int i = 0; i < reader.size(); i++){
gen.writeVarChar(i, reader);
}
break;
default:
throw new IllegalStateException(String.format("Unable to handle type %s.", mt));
}
gen.writeEndArray();
break;
}
}
}