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.Method;
/**
* An abstract class for {@code org.apache.commons.codec.BinaryEncoder} proxies.
*
* @author Jin Kwon
* @param encoder(delegate) type parameter
*/
public abstract class BinaryEncoderProxy extends EncoderProxy {
/**
* {@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());
}
}
/**
* {@code encode([B)[B}.
*/
private static final Method ENCODE;
static {
try {
ENCODE = ENCODER.getMethod("encode", byte[].class);
} catch (NoSuchMethodException nsme) {
throw new InstantiationError(nsme.getMessage());
}
}
protected static , T> Object newInstance(
final Class
proxyType, final Class encoderType, final T encoder) {
if (proxyType == null) {
throw new NullPointerException("proxyType");
}
if (!BinaryEncoderProxy.class.isAssignableFrom(proxyType)) {
throw new IllegalArgumentException(
"proxyType(" + proxyType + ") is not assignable to "
+ BinaryEncoderProxy.class);
}
return newInstance(ENCODER.getClassLoader(), new Class[]{ENCODER},
proxyType, encoderType, encoder);
}
/**
* Creates a new instance.
*
* @param encoder delegate
*/
protected BinaryEncoderProxy(final T encoder) {
super(encoder);
}
@Override
public Object invoke(final Object proxy, final Method method,
final Object[] args)
throws Throwable {
if (ENCODE.equals(method)) {
return encode((byte[]) args[0]);
}
return super.invoke(proxy, method, args);
}
@Override
protected Object encode(final Object source) throws Throwable {
try {
return encode((byte[]) source);
} catch (final ClassCastException cce) {
throw newEncoderException(cce);
}
}
/**
* Encodes given {@code source}.
*
* @param source source to encode.
*
* @return encoded output.
*
* @throws Throwable if an error occurs.
*/
protected abstract byte[] encode(final byte[] source) throws Throwable;
}