com.tectonica.jonix.export.JonixTabDelimitedExporter Maven / Gradle / Ivy
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/*
* Copyright (C) 2012 Zach Melamed
*
* Latest version available online at https://github.com/zach-m/jonix
* Contact me at [email protected]
*
* Licensed 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 com.tectonica.jonix.export;
import java.util.List;
import com.tectonica.jonix.JonixColumn;
import com.tectonica.jonix.JonixTabulator;
import com.tectonica.jonix.JonixUnifier;
import com.tectonica.jonix.stream.JonixStreamer;
/**
* An exporter for generating tab-delimited output out of ONIX source(s). Turning a tree-like ONIX product into a
* fixed-length column-oriented table is far from trivial. All the details are explained in {@link JonixColumn}.
*
* @author Zach Melamed
*/
public class JonixTabDelimitedExporter extends JonixExporter
{
private final JonixColumn[] columns;
protected boolean headerPrinted = false;
public JonixTabDelimitedExporter(JonixUnifier unifier, JonixColumn[] columns)
{
super(unifier);
if (columns == null)
throw new RuntimeException("At least one column must be specified");
this.columns = columns;
}
public JonixColumn
[] getColumns()
{
return columns;
}
@Override
protected boolean onBeforeFileList(List onixFileNames, JonixStreamer streamer)
{
super.onBeforeFileList(onixFileNames, streamer);
if (!headerPrinted) // we print header once per output, i.e. once in the exporter's life
{
out.println(JonixTabulator.headerAsTabDelimitedString(columns));
headerPrinted = true;
}
return true;
}
@Override
protected void onProduct(P product, JonixStreamer streamer)
{
super.onProduct(product, streamer); // logs an info line
out.println(JonixTabulator.productAsTabDelimitedString(product, columns));
}
}