com.googlecode.jinahya.commons.codec.BinaryDecoderProxy 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 decoder type parameter
*/
public abstract class BinaryDecoderProxy extends DecoderProxy {
/**
* Class for {@code org.apache.commons.codec.BinaryDecoder}.
*/
private static final Class DECODER;
static {
try {
DECODER = Class.forName("org.apache.commons.codec.BinaryDecoder");
} catch (ClassNotFoundException cnfe) {
throw new InstantiationError(cnfe.getMessage());
}
}
/**
* {@code decode([b)[b}.
*/
private static final Method DECODE;
static {
try {
DECODE = DECODER.getMethod("decode", byte[].class);
} catch (NoSuchMethodException nsme) {
throw new InstantiationError(nsme.getMessage());
}
}
/**
* Creates a new (proxy) instance.
*
* @param proxy type parameter.
* @param decoder type parameter
* @param proxyType proxy type
* @param decoderType decoder type
* @param decoder decoder
*
* @return a new (proxy) instance.
*/
protected static , D> Object newInstance(
final Class
proxyType, final Class decoderType, final D decoder) {
if (proxyType == null) {
throw new NullPointerException("proxyType");
}
if (decoderType == null) {
throw new NullPointerException("decoderType");
}
if (decoder == null) {
// ok
//throw new IllegalArgumentException("decoder");
}
try {
final Constructor constructor =
proxyType.getConstructor(decoderType);
if (!constructor.isAccessible()) {
constructor.setAccessible(true);
}
try {
return Proxy.newProxyInstance(DECODER.getClassLoader(),
new Class[]{DECODER},
constructor.newInstance(decoder));
} catch (InstantiationException ie) {
throw new RuntimeException(ie);
} catch (IllegalAccessException iae) {
throw new RuntimeException(iae);
} catch (InvocationTargetException ite) {
throw new RuntimeException(ite);
}
} catch (NoSuchMethodException nsme) {
throw new RuntimeException(nsme);
}
}
/**
* Creates a new instance.
*
* @param decoder the decoder to delegate.
*/
protected BinaryDecoderProxy(final D decoder) {
super(decoder);
}
@Override
public Object invoke(final Object proxy, final Method method,
final Object[] args)
throws Throwable {
if (DECODE.equals(method)) {
return decode(decoder, (byte[]) args[0]);
}
return super.invoke(proxy, method, args);
}
@Override
protected Object decode(final D decoder, final Object source)
throws Throwable {
if (source == null) {
//throw new NullPointerException("source");
throw newDecoderException("null source"); // documented?
}
try {
return decode(decoder, (byte[]) source);
} catch (ClassCastException cce) {
throw newDecoderException(cce);
}
}
protected abstract byte[] decode(final D decoder, final byte[] source)
throws Throwable;
}