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/**
* 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.
*/
<@pp.dropOutputFile />
<@pp.changeOutputFile name="org/apache/drill/exec/store/JSONOutputRecordWriter.java" />
<#include "/@includes/license.ftl" />
package org.apache.drill.exec.store;
import org.apache.drill.exec.store.EventBasedRecordWriter.FieldConverter;
import org.apache.drill.exec.vector.complex.reader.FieldReader;
import org.apache.drill.exec.vector.complex.fn.JsonOutput;
import java.io.IOException;
import java.lang.UnsupportedOperationException;
import java.util.List;
/**
* Abstract implementation of RecordWriter interface which exposes interface:
* {@link #writeHeader(List)}
* {@link #addField(int,String)}
* to output the data in string format instead of implementing addField for each type holder.
*
* This is useful for text format writers such as CSV, TSV etc.
*
* NB: Source code generated using FreeMarker template ${.template_name}
*/
public abstract class JSONOutputRecordWriter extends AbstractRecordWriter implements RecordWriter {
protected JsonOutput gen;
<#list vv.types as type>
<#list type.minor as minor>
<#list vv.modes as mode>
<#assign friendlyType = (minor.friendlyType!minor.boxedType!type.boxedType) />
@Override
public FieldConverter getNew${mode.prefix}${minor.class}Converter(int fieldId, String fieldName, FieldReader reader) {
return new ${mode.prefix}${minor.class}JsonConverter(fieldId, fieldName, reader);
}
public class ${mode.prefix}${minor.class}JsonConverter extends FieldConverter {
public ${mode.prefix}${minor.class}JsonConverter(int fieldId, String fieldName, FieldReader reader) {
super(fieldId, fieldName, reader);
}
@Override
public void startField() throws IOException {
gen.writeFieldName(fieldName);
}
@Override
public void writeField() throws IOException {
<#if mode.prefix == "Repeated" >
gen.writeStartArray();
for (int i = 0; i < reader.size(); i++) {
</#if>
<#assign typeName = minor.class >
<#switch minor.class>
<#case "UInt1">
<#case "UInt2">
<#case "UInt4">
<#case "UInt8">
<#assign typeName = "unsupported">
<#break>
<#case "Decimal9">
<#case "Decimal18">
<#case "Decimal28Sparse">
<#case "Decimal28Dense">
<#case "Decimal38Dense">
<#case "Decimal38Sparse">
<#assign typeName = "Decimal">
<#break>
<#case "Float4">
<#assign typeName = "Float">
<#break>
<#case "Float8">
<#assign typeName = "Double">
<#break>
<#case "IntervalDay">
<#case "IntervalYear">
<#assign typeName = "Interval">
<#break>
<#case "Bit">
<#assign typeName = "Boolean">
<#break>
<#case "TimeStamp">
<#assign typeName = "Timestamp">
<#break>
<#case "VarBinary">
<#assign typeName = "Binary">
<#break>
</#switch>
<#if typeName == "unsupported">
throw new UnsupportedOperationException("Unable to currently write ${minor.class} type to JSON.");
<#elseif mode.prefix == "Repeated" >
gen.write${typeName}(i, reader);
<#else>
gen.write${typeName}(reader);
</#if>
<#if mode.prefix == "Repeated">
}
gen.writeEndArray();
</#if>
}
}
</#list>
</#list>
</#list>
}
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