com.googlecode.jinahya.commons.codec.StringDecoderProxy 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;
/**
* Abstract class for proxies of {@code org.apache.commons.codec.StringDecoder}.
*
* @author Jin Kwon
* @param decoder type parameter.
*/
public abstract class StringDecoderProxy extends DecoderProxy {
/**
* {@code org.apache.commons.codec.StringDecoder}.
*/
private static final Class DECODER;
static {
try {
DECODER = Class.forName("org.apache.commons.codec.StringDecoder");
} catch (final ClassNotFoundException cnfe) {
throw new InstantiationError(cnfe.getMessage());
}
}
/**
* {@code decode(Ljava/lang/String;)Ljava/lang/String;}.
*/
private static final Method DECODE;
static {
try {
DECODE = DECODER.getMethod("decode", String.class);
} catch (final NoSuchMethodException nsme) {
throw new InstantiationError(nsme.getMessage());
}
}
/**
* Creates a new proxy instance.
*
* @param proxy type parameter
* @param user decoder type parameter
* @param proxyType proxy type
* @param decoderType decoder type
* @param decoder decoder
*
* @return a new instance.
*/
protected static , T> Object newInstance(
final Class
proxyType, final Class decoderType, final T decoder) {
if (proxyType == null) {
throw new NullPointerException("proxyType");
}
if (!StringDecoderProxy.class.isAssignableFrom(proxyType)) {
throw new IllegalArgumentException(
"proxyType(" + proxyType + ") is not assignable to "
+ StringDecoderProxy.class);
}
return newInstance(DECODER.getClassLoader(), new Class[]{DECODER},
proxyType, decoderType, decoder);
}
/**
* Creates a new instance.
*
* @param decoder the decoder to use.
*/
protected StringDecoderProxy(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((String) args[0]);
}
return super.invoke(proxy, method, args);
}
@Override
protected Object decode(final Object source) throws Throwable {
try {
return decode((String) source);
} catch (final ClassCastException cce) {
throw newDecoderException(cce);
}
}
/**
* Decodes given {@code source}.
*
* @param source source to decode
*
* @return decoded output
*
* @throws Throwable if an error occurs.
*/
protected abstract String decode(final String source) throws Throwable;
}