com.googlecode.jinahya.commons.codec.BinaryEncoderProxy Maven / Gradle / Ivy
/*
* Copyright 2012 Jin Kwon .
*
* 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.googlecode.jinahya.commons.codec;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
/**
*
* @author Jin Kwon
* @param encoder type parameter
*/
public abstract class BinaryEncoderProxy extends EncoderProxy {
/**
* Class for {@code org.apache.commons.codec.BinaryEncoder}.
*/
private static final Class ENCODER;
static {
try {
ENCODER = Class.forName(
"org.apache.commons.codec.BinaryEncoder");
} catch (ClassNotFoundException cnfe) {
throw new InstantiationError(cnfe.getMessage());
}
}
private static final Method ENCODE;
static {
try {
ENCODE = ENCODER.getMethod("encode", byte[].class);
} catch (NoSuchMethodException nsme) {
throw new InstantiationError(nsme.getMessage());
}
}
protected static , E> Object newInstance(
final Class
proxyType, final Class encoderType, final E encoder) {
// if (decoder == null) {
// throw new IllegalArgumentException("null decoder");
// }
try {
final Constructor constructor =
proxyType.getDeclaredConstructor(encoderType);
if (!constructor.isAccessible()) {
constructor.setAccessible(true);
}
try {
return Proxy.newProxyInstance(ENCODER.getClassLoader(),
new Class[]{ENCODER},
constructor.newInstance(encoder));
} catch (IllegalAccessException iae) {
throw new RuntimeException(iae);
} catch (InstantiationException ie) {
throw new RuntimeException(ie);
} catch (InvocationTargetException ite) {
throw new RuntimeException(ite);
}
} catch (NoSuchMethodException nsme) {
throw new RuntimeException(nsme);
}
}
/**
* Creates a new instance.
*
* @param encoder delegate
*/
protected BinaryEncoderProxy(final E encoder) {
super(encoder);
}
@Override
public Object invoke(final Object proxy, final Method method,
final Object[] args)
throws Throwable {
if (ENCODE.equals(method)) {
return encode(encoder, (byte[]) args[0]);
}
return super.invoke(proxy, method, args);
}
@Override
protected Object encode(final E encoder, final Object source)
throws Throwable {
if (source == null) {
//throw new NullPointerException("source");
throw newEncoderException("null source"); // documented
}
try {
return encode(encoder, (byte[]) source);
} catch (ClassCastException cce) {
throw newEncoderException(cce);
}
}
protected abstract byte[] encode(final E decoder, final byte[] source)
throws Throwable;
}