/*
* The MIT License
*
* Copyright (c) 2011 The Broad Institute
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package htsjdk.samtools.util;
import htsjdk.samtools.SAMException;
import org.xerial.snappy.LoadSnappy;
import org.xerial.snappy.SnappyInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Constructor;
/**
* If Snappy is available, obtain single-arg ctors for SnappyInputStream and SnappyOutputStream.
*/
public class SnappyLoader {
private static final int SNAPPY_BLOCK_SIZE = 32768; // keep this as small as can be without hurting compression ratio.
private final Constructor<InputStream> SnappyInputStreamCtor;
private final Constructor<OutputStream> SnappyOutputStreamCtor;
public final boolean SnappyAvailable;
// Force Snappy-java code to be loaded into executable jars.
private final SnappyInputStream ignoreMe = null;
// Force bcel to load Snappy.
//private static final Class SnappyClass = SnappyInputStream.class;
private static final boolean DefaultVerbosity = Boolean.valueOf(System.getProperty("snappy.loader.verbosity", "false"));
public SnappyLoader() {
this(DefaultVerbosity);
}
/**
* Constructs a new SnappyLoader which will check to see if snappy is available in the JVM/library path.
* @param verbose if true output a small number of debug messages to System.err
*/
public SnappyLoader(final boolean verbose) {
Constructor<InputStream> inputStreamCtor = null;
Constructor<OutputStream> outputStreamCtor = null;
Class<Error> snappyErrorClass = null;
if (java.lang.Boolean.valueOf(System.getProperty("snappy.disable", "false"))) {
System.err.println("Snappy is disabled via system property.");
}
else {
try {
final Class<InputStream> snappyInputStreamClass = (Class<InputStream>)Class.forName("org.xerial.snappy.SnappyInputStream");
final Class<OutputStream> snappyOutputStreamClass = (Class<OutputStream>)Class.forName("org.xerial.snappy.SnappyOutputStream");
snappyErrorClass = (Class<Error>)Class.forName("org.xerial.snappy.SnappyError");
inputStreamCtor = snappyInputStreamClass.getConstructor(InputStream.class);
outputStreamCtor = snappyOutputStreamClass.getConstructor(OutputStream.class, Integer.TYPE);
}
catch (NoSuchMethodException e) { /* Do nothing. */ }
catch (ClassNotFoundException e) { /* Do nothing. */ }
}
this.SnappyInputStreamCtor = inputStreamCtor;
this.SnappyOutputStreamCtor = outputStreamCtor;
if (this.SnappyInputStreamCtor != null && this.SnappyOutputStreamCtor != null) {
// Don't try to call any Snappy code until classes have been found via reflection above.
boolean tmpSnappyAvailable;
try {
if (!LoadSnappy.load()) {
if (verbose) System.err.println("Snappy dll failed to load.");
tmpSnappyAvailable = false;
}
else {
if (verbose) System.err.println("Snappy stream classes loaded.");
tmpSnappyAvailable = true;
}
} catch (Error e) {
if (e.getClass().equals(snappyErrorClass)) {
if (verbose) System.err.println("Snappy dll failed to load: " + e.getMessage());
tmpSnappyAvailable = false;
} else {
throw e;
}
}
SnappyAvailable = tmpSnappyAvailable;
}
else {
if (verbose) System.err.println("Snappy stream classes not loaded.");
SnappyAvailable = false;
}
}
/** Wrap an InputStream in a SnappyInputStream. If Snappy is not available will throw an exception. */
public InputStream wrapInputStream(final InputStream inputStream) {
try {
return SnappyInputStreamCtor.newInstance(inputStream);
} catch (Exception e) {
throw new SAMException("Error instantiating SnappyInputStream", e);
}
}
/** Wrap an InputStream in a SnappyInputStream. If Snappy is not available will throw an exception. */
public OutputStream wrapOutputStream(final OutputStream outputStream) {
try {
return SnappyOutputStreamCtor.newInstance(outputStream, SNAPPY_BLOCK_SIZE);
} catch (Exception e) {
throw new SAMException("Error instantiating SnappyOutputStream", e);
}
}
}