com.twelvemonkeys.imageio.plugins.jmagick.JMagickImageReaderSpiSupport Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of imageio-jmagick Show documentation
Show all versions of imageio-jmagick Show documentation
ImageIO wrapper for JMagick.
See the <a href="http://www.yeo.id.au/jmagick/">JMagick Home page</a>
for more information.
The newest version!
/*
* Copyright (c) 2008, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name "TwelveMonkeys" nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.twelvemonkeys.imageio.plugins.jmagick;
import com.twelvemonkeys.lang.SystemUtil;
import javax.imageio.ImageReader;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.spi.ServiceRegistry;
import javax.imageio.stream.ImageInputStream;
import java.io.IOException;
import java.util.Locale;
/**
* JMagickImageReaderSpiSupport
*
*
* @author Harald Kuhr
* @version $Id: JimiImageReaderSpiSupport.java,v 1.1 2003/12/02 16:45:00 wmhakur Exp $
*/
abstract class JMagickImageReaderSpiSupport extends ImageReaderSpi {
final static boolean AVAILABLE = SystemUtil.isClassAvailable("com.twelvemonkeys.imageio.plugins.jmagick.JMagick", JMagickImageReaderSpiSupport.class);
/**
* Creates a JMagickImageReaderSpiSupport
*
* @param pFormatNames format names
* @param pSuffixes format suffixes
* @param pMimeTypes format MIME types
* @param pReaderClassName format reader class name
* @param pWriterSpiNames format writer service provider namses
*/
protected JMagickImageReaderSpiSupport(final String[] pFormatNames,
final String[] pSuffixes,
final String[] pMimeTypes,
final String pReaderClassName,
final String[] pWriterSpiNames) {
super(
"TwelveMonkeys", // Vendor name
"2.0", // Version
AVAILABLE ? pFormatNames : new String[]{""}, // Names
AVAILABLE ? pSuffixes : null, // Suffixes
AVAILABLE ? pMimeTypes : null, // Mime-types
pReaderClassName, // Reader class name
new Class[] {ImageInputStream.class}, // Input types
pWriterSpiNames, // Writer SPI names
true, // Supports standard stream metadata format
null, // Native stream metadata format name
null, // Native stream metadata format class name
null, // Extra stream metadata format names
null, // Extra stream metadata format class names
true, // Supports standard image metadata format
null, // Native image metadata format name
null, // Native image metadata format class name
null, // Extra image metadata format names
null// Extra image metadata format class names
);
}
public boolean canDecodeInput(Object pSource) throws IOException {
return pSource instanceof ImageInputStream && AVAILABLE && canDecode0((ImageInputStream) pSource);
}
private boolean canDecode0(ImageInputStream pSource) throws IOException {
pSource.mark();
try {
return canDecode(pSource);
}
finally {
pSource.reset();
}
}
/**
* Specifies if this provider's reader may decode the provided input.
* Stream mark/reset is handled, and need not be taken care of.
*
* @param pSource the source image input stream
* @return {@code true} if the inout can be decoded
* @throws IOException if an I/O exception occurs during the process
*/
abstract boolean canDecode(ImageInputStream pSource) throws IOException;
public final ImageReader createReaderInstance(Object pExtension) throws IOException {
try {
return createReaderImpl(pExtension);
}
catch (Throwable t) {
// Wrap in IOException if the reader can't be instantiated.
// This makes the IIORegistry deregister this service provider
IOException exception = new IOException(t.getMessage());
exception.initCause(t);
throw exception;
}
}
protected abstract JMagickReader createReaderImpl(Object pExtension) throws IOException;
public String getDescription(Locale pLocale) {
return "JMagick " + getFormatNames()[0].toUpperCase() + " image reader";
}
@Override
@SuppressWarnings({"unchecked"})
public void onRegistration(ServiceRegistry pRegistry, Class pCategory) {
if (!AVAILABLE) {
pRegistry.deregisterServiceProvider(this, pCategory);
}
}
/**
* Specifies if the reader created by this provider should use temporary
* file, instead of passing the data in-memory to the native reader.
*
* @return {@code true} if the reader should use a temporary file
*/
public boolean useTempFile() {
return "TRUE".equalsIgnoreCase(JMagick.sProperties.getProperty(getFormatNames()[0] + ".useTempFile"));
}
}