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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
/**
* @author Rustem V. Rafikov
* @version $Revision: 1.3 $
*/
package javax.imageio.spi;
import javax.imageio.stream.ImageOutputStream;
import java.io.IOException;
import java.io.File;
/**
* The ImageOutputStreamSpi abstract class is a service provider
* interface (SPI) for ImageOutputStreams.
*/
public abstract class ImageOutputStreamSpi extends IIOServiceProvider implements
RegisterableService {
/** The output class. */
protected Class<?> outputClass;
/**
* Instantiates a new ImageOutputStreamSpi.
*/
protected ImageOutputStreamSpi() {
throw new UnsupportedOperationException("Not supported yet");
}
/**
* Instantiates a new ImageOutputStreamSpi.
*
* @param vendorName the vendor name.
* @param version the version.
* @param outputClass the output class.
*/
public ImageOutputStreamSpi(String vendorName, String version, Class<?> outputClass) {
super(vendorName, version);
this.outputClass = outputClass;
}
/**
* Gets an output Class object that represents the class or
* interface that must be implemented by an output source.
*
* @return the output class.
*/
public Class<?> getOutputClass() {
return outputClass;
}
/**
* Returns true if the ImageOutputStream can use a cache
* file. If this method returns false, the value of the
* useCache parameter of createOutputStreamInstance will
* be ignored. The default implementation returns false.
*
* @return true if the ImageOutputStream can use a cache
* file, false otherwise.
*/
public boolean canUseCacheFile() {
return false; // def
}
/**
* Returns true if the ImageOutputStream implementation
* requires the use of a cache file. The default implementation
* returns false.
*
* @return true if the ImageOutputStream implementation
* requires the use of a cache file, false otherwise.
*/
public boolean needsCacheFile() {
return false; // def
}
/**
* Creates the ImageOutputStream associated with this
* service provider. The output object should
* be an instance of the class returned by getOutputClass
* method. This method uses the default system directory
* for the cache file, if it is needed.
*
* @param output the output Object.
*
* @return the ImageOutputStream.
*
* @throws IOException Signals that an I/O exception has occurred.
*/
public ImageOutputStream createOutputStreamInstance(Object output) throws IOException {
return createOutputStreamInstance(output, true, null);
}
/**
* Creates the ImageOutputStream associated with this
* service provider. The output object should
* be an instance of the class returned by getInputClass
* method. This method uses the specified directory
* for the cache file, if the useCache parameter is true.
*
* @param output the output Object.
* @param useCache the flag indicating if cache file
* is needed or not.
* @param cacheDir the cache directory.
*
* @return the ImageOutputStream.
*
* @throws IOException Signals that an I/O exception has occurred.
*/
public abstract ImageOutputStream createOutputStreamInstance(Object output,
boolean useCache, File cacheDir) throws IOException;
}
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