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/*******************************************************************************
* Copyright (c) 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.transforms;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URL;
/**
* A proxy stream transformer is a transformer instance that relies on reflection to obtain the "getInputStream" method from an underlying object.
* This class is useful due to the restrictions in the builder that prevent transformer providers from directly implementing {@link StreamTransformer} due to visibility and builder issues related to referring to classes within fragments.
*/
public class ProxyStreamTransformer extends StreamTransformer {
private Method method;
private Object object;
/**
* Create a new proxy transformer based on the given object.
* @param object the object to proxy
* @throws SecurityException thrown if there is an issue utilizing the reflection methods
* @throws NoSuchMethodException thrown if the provided object does not have a "getInputStream" method that takes an {@link InputStream} and an {@link URL}
*/
public ProxyStreamTransformer(Object object) throws SecurityException, NoSuchMethodException {
this.object = object;
method = object.getClass().getMethod("getInputStream", new Class[] {InputStream.class, URL.class}); //$NON-NLS-1$
Class returnType = method.getReturnType();
if (!returnType.equals(InputStream.class))
throw new NoSuchMethodException();
}
public InputStream getInputStream(InputStream inputStream, URL transformerUrl) throws IOException {
try {
return (InputStream) method.invoke(object, new Object[] {inputStream, transformerUrl});
} catch (IllegalArgumentException e) {
throw new IOException(e.getMessage());
} catch (IllegalAccessException e) {
throw new IOException(e.getMessage());
} catch (InvocationTargetException e) {
if (e.getCause() instanceof IOException)
throw (IOException) e.getCause();
}
return null;
}
/**
* Get the object that is being proxied.
* @return the object. Never <code>null</code>.
*/
public Object getTransformer() {
return object;
}
}
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