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/*
* Druid - a distributed column store.
* Copyright (C) 2012, 2013 Metamarkets Group Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package io.druid.common.guava;
import com.google.common.base.Charsets;
import com.google.common.base.Function;
import com.google.common.collect.Iterables;
import com.google.common.io.CharStreams;
import com.google.common.io.InputSupplier;
import javax.annotation.Nullable;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.List;
import java.util.zip.GZIPInputStream;
/**
*/
public class GuavaUtils
{
public static Function formatFunction(final String formatString)
{
return new Function()
{
@Override
public String apply(@Nullable String input)
{
return String.format(formatString, input);
}
};
}
public static InputSupplier joinFiles(final File... files)
{
return joinFiles(Arrays.asList(files));
}
public static InputSupplier joinFiles(final List files)
{
return new InputSupplier()
{
@Override
public BufferedReader getInput() throws IOException
{
return new BufferedReader(
CharStreams.join(
Iterables.transform(
files,
new Function>()
{
@Override
public InputSupplier apply(final File input)
{
return new InputSupplier()
{
@Override
public InputStreamReader getInput() throws IOException
{
InputStream baseStream = new FileInputStream(input);
if (input.getName().endsWith(".gz")) {
baseStream = new GZIPInputStream(baseStream);
}
return new InputStreamReader(baseStream, Charsets.UTF_8);
}
};
}
}
)
).getInput()
);
}
};
}
}
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