/*
* 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.
*/
package gobblin.util.io;
import java.io.FilterInputStream;
import java.io.FilterOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Field;
/**
* Contains utilities for getting uderlying streams to a filter stream.
*/
public class FilterStreamUnpacker {
/**
* Finds the underlying {@link InputStream} to a {@link FilterInputStream}. Note this is not always possible due
* to security restrictions of the JVM.
* @throws IllegalAccessException If security policies of the JVM prevent unpacking of the {@link FilterInputStream}.
*/
public static InputStream unpackFilterInputStream(FilterInputStream is) throws IllegalAccessException {
try {
Field field = FilterInputStream.class.getDeclaredField("in");
field.setAccessible(true);
return (InputStream) field.get(is);
} catch (NoSuchFieldException nsfe) {
throw new RuntimeException(nsfe);
}
}
/**
* Finds the underlying {@link OutputStream} to a {@link FilterOutputStream}. Note this is not always possible due
* to security restrictions of the JVM.
* @throws IllegalAccessException If security policies of the JVM prevent unpacking of the {@link FilterOutputStream}.
*/
public static OutputStream unpackFilterOutputStream(FilterOutputStream os) throws IllegalAccessException {
try {
Field field = FilterOutputStream.class.getDeclaredField("out");
field.setAccessible(true);
return (OutputStream) field.get(os);
} catch (NoSuchFieldException nsfe) {
throw new RuntimeException(nsfe);
}
}
}