/*
* Copyright (c) 2000, 2007, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javax.imageio.event;
import java.util.EventListener;
import javax.imageio.ImageReader;
/** {@collect.stats}
* An interface used by <code>ImageReader</code> implementations to
* notify callers of their image and thumbnail reading methods of
* progress.
*
* <p> This interface receives general indications of decoding
* progress (via the <code>imageProgress</code> and
* <code>thumbnailProgress</code> methods), and events indicating when
* an entire image has been updated (via the
* <code>imageStarted</code>, <code>imageComplete</code>,
* <code>thumbnailStarted</code> and <code>thumbnailComplete</code>
* methods). Applications that wish to be informed of pixel updates
* as they happen (for example, during progressive decoding), should
* provide an <code>IIOReadUpdateListener</code>.
*
* @see IIOReadUpdateListener
* @see javax.imageio.ImageReader#addIIOReadProgressListener
* @see javax.imageio.ImageReader#removeIIOReadProgressListener
*
*/
public interface IIOReadProgressListener extends EventListener {
/** {@collect.stats}
* Reports that a sequence of read operations is beginning.
* <code>ImageReader</code> implementations are required to call
* this method exactly once from their
* <code>readAll(Iterator)</code> method.
*
* @param source the <code>ImageReader</code> object calling this method.
* @param minIndex the index of the first image to be read.
*/
void sequenceStarted(ImageReader source, int minIndex);
/** {@collect.stats}
* Reports that a sequence of read operationshas completed.
* <code>ImageReader</code> implementations are required to call
* this method exactly once from their
* <code>readAll(Iterator)</code> method.
*
* @param source the <code>ImageReader</code> object calling this method.
*/
void sequenceComplete(ImageReader source);
/** {@collect.stats}
* Reports that an image read operation is beginning. All
* <code>ImageReader</code> implementations are required to call
* this method exactly once when beginning an image read
* operation.
*
* @param source the <code>ImageReader</code> object calling this method.
* @param imageIndex the index of the image being read within its
* containing input file or stream.
*/
void imageStarted(ImageReader source, int imageIndex);
/** {@collect.stats}
* Reports the approximate degree of completion of the current
* <code>read</code> call of the associated
* <code>ImageReader</code>.
*
* <p> The degree of completion is expressed as a percentage
* varying from <code>0.0F</code> to <code>100.0F</code>. The
* percentage should ideally be calculated in terms of the
* remaining time to completion, but it is usually more practical
* to use a more well-defined metric such as pixels decoded or
* portion of input stream consumed. In any case, a sequence of
* calls to this method during a given read operation should
* supply a monotonically increasing sequence of percentage
* values. It is not necessary to supply the exact values
* <code>0</code> and <code>100</code>, as these may be inferred
* by the callee from other methods.
*
* <p> Each particular <code>ImageReader</code> implementation may
* call this method at whatever frequency it desires. A rule of
* thumb is to call it around each 5 percent mark.
*
* @param source the <code>ImageReader</code> object calling this method.
* @param percentageDone the approximate percentage of decoding that
* has been completed.
*/
void imageProgress(ImageReader source, float percentageDone);
/** {@collect.stats}
* Reports that the current image read operation has completed.
* All <code>ImageReader</code> implementations are required to
* call this method exactly once upon completion of each image
* read operation.
*
* @param source the <code>ImageReader</code> object calling this
* method.
*/
void imageComplete(ImageReader source);
/** {@collect.stats}
* Reports that a thumbnail read operation is beginning. All
* <code>ImageReader</code> implementations are required to call
* this method exactly once when beginning a thumbnail read
* operation.
*
* @param source the <code>ImageReader</code> object calling this method.
* @param imageIndex the index of the image being read within its
* containing input file or stream.
* @param thumbnailIndex the index of the thumbnail being read.
*/
void thumbnailStarted(ImageReader source,
int imageIndex, int thumbnailIndex);
/** {@collect.stats}
* Reports the approximate degree of completion of the current
* <code>getThumbnail</code> call within the associated
* <code>ImageReader</code>. The semantics are identical to those
* of <code>imageProgress</code>.
*
* @param source the <code>ImageReader</code> object calling this method.
* @param percentageDone the approximate percentage of decoding that
* has been completed.
*/
void thumbnailProgress(ImageReader source, float percentageDone);
/** {@collect.stats}
* Reports that a thumbnail read operation has completed. All
* <code>ImageReader</code> implementations are required to call
* this method exactly once upon completion of each thumbnail read
* operation.
*
* @param source the <code>ImageReader</code> object calling this
* method.
*/
void thumbnailComplete(ImageReader source);
/** {@collect.stats}
* Reports that a read has been aborted via the reader's
* <code>abort</code> method. No further notifications will be
* given.
*
* @param source the <code>ImageReader</code> object calling this
* method.
*/
void readAborted(ImageReader source);
}