/*
* 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 of the copyright holder 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 HOLDER 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.image;
import java.awt.image.
ImageConsumer;
import java.awt.image.
ImageProducer;
import java.util.
ArrayList;
import java.util.
List;
/**
* AbstractImageSource
* <p/>
*
* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
* @version $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/image/AbstractImageSource.java#1 $
*/
public abstract class
AbstractImageSource implements
ImageProducer {
private
List<
ImageConsumer>
consumers = new
ArrayList<
ImageConsumer>();
protected int
width;
protected int
height;
protected int
xOff;
protected int
yOff;
// ImageProducer interface
public void
addConsumer(final
ImageConsumer pConsumer) {
if (
consumers.
contains(
pConsumer)) {
return;
}
consumers.
add(
pConsumer);
try {
initConsumer(
pConsumer);
sendPixels(
pConsumer);
if (
isConsumer(
pConsumer)) {
pConsumer.
imageComplete(
ImageConsumer.
STATICIMAGEDONE);
// Get rid of "sticky" consumers...
if (
isConsumer(
pConsumer)) {
pConsumer.
imageComplete(
ImageConsumer.
IMAGEERROR);
removeConsumer(
pConsumer);
}
}
}
catch (
Exception e) {
e.
printStackTrace();
if (
isConsumer(
pConsumer)) {
pConsumer.
imageComplete(
ImageConsumer.
IMAGEERROR);
}
}
}
public void
removeConsumer(final
ImageConsumer pConsumer) {
consumers.
remove(
pConsumer);
}
/**
* This implementation silently ignores this instruction. If pixel data is
* not in TDLR order by default, subclasses must override this method.
*
* @param pConsumer the consumer that requested the resend
*
* @see ImageProducer#requestTopDownLeftRightResend(java.awt.image.ImageConsumer)
*/
public void
requestTopDownLeftRightResend(final
ImageConsumer pConsumer) {
// ignore
}
public void
startProduction(final
ImageConsumer pConsumer) {
addConsumer(
pConsumer);
}
public boolean
isConsumer(final
ImageConsumer pConsumer) {
return
consumers.
contains(
pConsumer);
}
protected abstract void
initConsumer(
ImageConsumer pConsumer);
protected abstract void
sendPixels(
ImageConsumer pConsumer);
}