ServiceFactory.java, [...]: New files.
2004-04-21 Michael Koch <konqueror@gmx.de> * gnu/classpath/ServiceFactory.java, gnu/classpath/ServiceProviderLoadingAction.java, javax/imageio/ImageReader.java, javax/imageio/ImageTranscoder.java, javax/imageio/ImageWriter.java, javax/imageio/package.html, javax/imageio/spi/IIOServiceProvider.java, javax/imageio/spi/ImageInputStreamSpi.java, javax/imageio/spi/ImageOutputStreamSpi.java, javax/imageio/spi/ImageReaderWriterSpi.java, javax/imageio/spi/ImageTranscoderSpi.java, javax/imageio/spi/RegisterableService.java, javax/imageio/spi/ServiceRegistry.java, javax/imageio/spi/package.html, javax/imageio/stream/IIOByteBuffer.java, javax/imageio/stream/ImageInputStream.java, javax/imageio/stream/ImageOutputStream.java, javax/imageio/stream/package.html: New files. * Makefile.am (ordinary_java_source_files): Added gnu/classpath/ServiceFactory.java and gnu/classpath/ServiceProviderLoadingAction.java. (javax_source_files): Added javax/imageio/ImageReader.java, javax/imageio/ImageTranscoder.java, javax/imageio/ImageWriter.java, javax/imageio/spi/IIOServiceProvider.java, javax/imageio/spi/ImageInputStreamSpi.java, javax/imageio/spi/ImageOutputStreamSpi.java, javax/imageio/spi/ImageReaderWriterSpi.java, javax/imageio/spi/ImageTranscoderSpi.java, javax/imageio/spi/RegisterableService.java, javax/imageio/spi/ServiceRegistry.java, javax/imageio/stream/IIOByteBuffer.java, javax/imageio/stream/ImageInputStream.java and javax/imageio/stream/ImageOutputStream.java. * Makefile.in: Regenerated. From-SVN: r80951
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Michael Koch
Michael Koch
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96d22b1232
21 changed files with 3883 additions and 3 deletions
149
libjava/gnu/classpath/ServiceProviderLoadingAction.java
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149
libjava/gnu/classpath/ServiceProviderLoadingAction.java
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/* ServiceProviderLoadingAction.java -- Action for loading plug-in services.
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Copyright (C) 2004 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.classpath;
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import java.security.PrivilegedExceptionAction;
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/**
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* A privileged action for creating a new instance of a service
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* provider.
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*
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* <p>Class loading and instantiation is encapsulated in a
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* <code>PriviledgedAction</code> in order to restrict the loaded
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* service providers to the {@link java.security.AccessControlContext}
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* that was active when {@link
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* gnu.classpath.ServiceFactory#lookupProviders} was called, even
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* though the actual loading is delayed to the time when the provider
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* is actually needed.
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*
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* @author <a href="mailto:brawer@dandelis.ch">Sascha Brawer</a>
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*/
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final class ServiceProviderLoadingAction
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implements PrivilegedExceptionAction
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{
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/**
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* The interface to which the loaded service provider implementation
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* must conform. Usually, this is a Java interface type, but it
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* might also be an abstract class or even a concrete class.
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*/
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private final Class spi;
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/**
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* The fully qualified name of the class that gets loaded when
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* this action is executed.
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*/
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private final String providerName;
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/**
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* The ClassLoader that gets used for loading the service provider
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* class.
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*/
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private final ClassLoader loader;
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/**
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* Constructs a privileged action for loading a service provider.
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*
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* @param spi the interface to which the loaded service provider
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* implementation must conform. Usually, this is a Java interface
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* type, but it might also be an abstract class or even a concrete
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* superclass.
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*
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* @param providerName the fully qualified name of the class that
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* gets loaded when this action is executed.
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*
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* @param loader the ClassLoader that gets used for loading the
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* service provider class.
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*
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* @throws IllegalArgumentException if <code>spi</code>,
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* <code>providerName</code> or <code>loader</code> is
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* <code>null</code>.
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*/
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ServiceProviderLoadingAction(Class spi, String providerName,
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ClassLoader loader)
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{
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if (spi == null || providerName == null || loader == null)
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throw new IllegalArgumentException();
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this.spi = spi;
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this.providerName = providerName;
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this.loader = loader;
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}
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/**
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* Loads an implementation class for a service provider, and creates
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* a new instance of the loaded class by invoking its public
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* no-argument constructor.
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*
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* @return a new instance of the class whose name was passed as
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* <code>providerName</code> to the constructor.
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*
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* @throws ClassCastException if the service provider does not
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* implement the <code>spi</code> interface that was passed to the
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* constructor.
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*
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* @throws IllegalAccessException if the service provider class or
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* its no-argument constructor are not <code>public</code>.
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*
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* @throws InstantiationException if the service provider class is
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* <code>abstract</code>, an interface, a primitive type, an array
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* class, or void; or if service provider class does not have a
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* no-argument constructor; or if there some other problem with
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* creating a new instance of the service provider.
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*/
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public Object run()
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throws Exception
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{
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Class loadedClass;
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Object serviceProvider;
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loadedClass = loader.loadClass(providerName);
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serviceProvider = loadedClass.newInstance();
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// Ensure that the loaded provider is actually implementing
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// the service provider interface.
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if (!spi.isInstance(serviceProvider))
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throw new ClassCastException(spi.getName());
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return serviceProvider;
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}
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}
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