Added xz compression support

src/main/java/org/codehaus/plexus/archiver/xz/PlexusIOXZResourceCollection.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2016 Codehaus.
+ *
+ * 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 org.codehaus.plexus.archiver.xz;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.HashMap;
+import org.codehaus.plexus.components.io.attributes.Java7FileAttributes;
+import org.codehaus.plexus.components.io.attributes.PlexusIoResourceAttributes;
+import org.codehaus.plexus.components.io.resources.PlexusIoCompressedFileResourceCollection;
+import org.codehaus.plexus.util.IOUtil;
+
+/**
+ *
+ * @author lore
+ */
+public class PlexusIOXZResourceCollection extends PlexusIoCompressedFileResourceCollection
+{
+
+    @Override
+    protected PlexusIoResourceAttributes getAttributes( File file ) throws IOException 
+    {
+        return new Java7FileAttributes(file, new HashMap<Integer, String>(), new HashMap<Integer, String>());
+    }
+
+    @Override
+    protected String getDefaultExtension()
+    {
+        return ".xz";
+    }
+
+    @Override
+    protected InputStream getInputStream( File file ) throws IOException
+    {
+        FileInputStream fileIs = new FileInputStream( file );
+
+        try
+        {
+            final InputStream result = XZUnArchiver.getXZInputStream( fileIs );
+
+            return result;
+        }
+        finally
+        {
+            IOUtil.close(fileIs);
+        }
+    }
+}

src/main/java/org/codehaus/plexus/archiver/xz/XZArchiver.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2016 Codehaus.
+ *
+ * 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 org.codehaus.plexus.archiver.xz;
+
+import java.io.IOException;
+import org.codehaus.plexus.archiver.AbstractArchiver;
+import org.codehaus.plexus.archiver.ArchiveEntry;
+import org.codehaus.plexus.archiver.ArchiverException;
+import org.codehaus.plexus.archiver.ResourceIterator;
+
+/**
+ *
+ * @author philiplourandos
+ */
+public class XZArchiver extends AbstractArchiver {
+
+    private final XZCompressor compressor = new XZCompressor();
+
+    public XZArchiver() 
+    {
+    }
+
+    @Override
+    protected void execute() throws ArchiverException, IOException 
+    {
+        if ( !checkForced()) 
+        {
+            return;
+        }
+
+        ResourceIterator iter = getResources();
+        ArchiveEntry entry = iter.next();
+        if ( iter.hasNext() )
+        {
+            throw new ArchiverException( "There is more than one file in input." );
+        }
+        compressor.setSource( entry.getResource() );
+        compressor.setDestFile( getDestFile() );
+        compressor.compress();
+    }
+
+    @Override
+    public boolean isSupportingForced() 
+    {
+        return true;
+    }
+
+    @Override
+    protected void close() throws IOException 
+    {
+        compressor.close();
+    }
+
+    @Override
+    protected String getArchiveType() 
+    {
+        return "xz";
+    }
+}

src/main/java/org/codehaus/plexus/archiver/xz/XZCompressor.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright 2016 Codehaus.
+ *
+ * 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 org.codehaus.plexus.archiver.xz;
+
+import java.io.IOException;
+import org.apache.commons.compress.compressors.xz.XZCompressorOutputStream;
+import org.codehaus.plexus.archiver.ArchiverException;
+import org.codehaus.plexus.archiver.util.Compressor;
+import org.codehaus.plexus.util.IOUtil;
+
+import static org.codehaus.plexus.archiver.util.Streams.bufferedOutputStream;
+import static org.codehaus.plexus.archiver.util.Streams.fileOutputStream;
+
+/**
+ *
+ * @author philip.lourandos
+ */
+public class XZCompressor extends Compressor 
+{
+    private XZCompressorOutputStream xzOut;
+
+    public XZCompressor() 
+    {
+    }
+
+    @Override
+    public void compress() throws ArchiverException 
+    {
+        try
+        {
+            xzOut = new XZCompressorOutputStream( bufferedOutputStream( fileOutputStream( getDestFile() ) ) );
+
+            compress( getSource(), xzOut);
+        }
+        catch ( IOException ioe ) 
+        {
+            throw new ArchiverException( "Problem creating xz " + ioe.getMessage(), ioe);
+        }
+    }
+
+    @Override
+    public void close() 
+    {
+        IOUtil.close( xzOut );
+        xzOut = null;
+    }
+}

src/main/java/org/codehaus/plexus/archiver/xz/XZUnArchiver.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2016 Codehaus.
+ *
+ * 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 org.codehaus.plexus.archiver.xz;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import javax.annotation.Nonnull;
+import org.apache.commons.compress.compressors.xz.XZCompressorInputStream;
+import org.codehaus.plexus.archiver.AbstractUnArchiver;
+import org.codehaus.plexus.archiver.ArchiverException;
+
+import static org.codehaus.plexus.archiver.util.Streams.bufferedInputStream;
+import static org.codehaus.plexus.archiver.util.Streams.bufferedOutputStream;
+import static org.codehaus.plexus.archiver.util.Streams.copyFully;
+import static org.codehaus.plexus.archiver.util.Streams.fileInputStream;
+import static org.codehaus.plexus.archiver.util.Streams.fileOutputStream;
+
+/**
+ *
+ * @author philip.lourandos
+ */
+public class XZUnArchiver extends AbstractUnArchiver 
+{
+    private static final String OPERATION_XZ = "xz";
+
+    public XZUnArchiver()
+    {
+    }
+
+    public XZUnArchiver( File source )
+    {
+        super( source );
+    }
+
+    @Override
+    protected void execute() throws ArchiverException
+    {
+        if ( getSourceFile().lastModified() > getDestFile().lastModified() )
+        {
+            getLogger().info( "Expanding " + getSourceFile().getAbsolutePath() + " to " 
+                + getDestFile().getAbsolutePath() );
+
+            copyFully( getXZInputStream( bufferedInputStream( fileInputStream( getSourceFile(), OPERATION_XZ) ) ),
+                    bufferedOutputStream( fileOutputStream( getDestFile(), OPERATION_XZ) ), OPERATION_XZ );
+        }
+    }
+
+    public static @Nonnull XZCompressorInputStream getXZInputStream( InputStream in )
+            throws ArchiverException
+    {
+        try 
+        {
+            return new XZCompressorInputStream(in);
+        }
+        catch (IOException ioe) 
+        {
+            throw new ArchiverException( "Trouble creating BZIP2 compressor, invalid file ?", ioe );
+        }
+    }
+
+    @Override
+    protected void execute(String path, File outputDirectory) throws ArchiverException {
+        throw new UnsupportedOperationException("Targeted execution not supported in xz format");
+
+    }
+}