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/*
* Copyright (c) 2008, 2010, 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
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*/
package com.codename1.ui.html;
import com.codename1.ui.Component;
import com.codename1.ui.Display;
import com.codename1.ui.Image;
import com.codename1.ui.Label;
import com.codename1.ui.geom.Dimension;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
/**
* ResourceThreadQueue is a thread queue used to create and manage threads that download images and CSS files that were referred from HTML pages
* Was called ImageThreadQueue but name was changed since it now handles CSS as well
*
* @author Ofir Leitner
*/
class ResourceThreadQueue {
/**
* The default number of maximum threads used for image download
*/
private static int DEFAULT_MAX_THREADS = 2;
HTMLComponent htmlC;
Vector queue = new Vector();
Vector running = new Vector();
Vector bgImageCompsUnselected = new Vector();
Vector bgImageCompsSelected = new Vector();
Vector bgImageCompsPressed = new Vector();
Hashtable images = new Hashtable();
static int maxThreads = DEFAULT_MAX_THREADS;
int threadCount;
private int cssCount=-1; // As long as there are no CSS files this stays -1 and thus CSS loading is ignored
boolean started;
/**
* Constructs the queue
*
* @param htmlC The HTMLComponent this queue belongs to
*/
ResourceThreadQueue(HTMLComponent htmlC) {
this.htmlC=htmlC;
}
/**
* Sets the maximum number of threads to use for image download
* If startRunning was already called, this will takes effect in the next page loaded.
*
* @param threadsNum the maximum number of threads to use for image download
*/
static void setMaxThreads(int threadsNum) {
maxThreads=threadsNum;
}
/**
* Adds the image to the queue
*
* @param imgLabel The label in which the image should be contained after loaded
* @param imageUrl The URL this image should be fetched from
*/
synchronized void add(Component imgLabel,String imageUrl) {
/*if ((HTMLComponent.TABLES_LOCK_SIZE) && (htmlC.curTable!=null)) {
downloadImageImmediately(imgLabel, imageUrl, 0);
} else {*/
if (started) {
throw new IllegalStateException("ResourceThreadQueue already started! stop/cancel first");
}
images.put(imgLabel, imageUrl); // Using a hashtable to collect all requests first enables overriding urls for labels (For example in CSS use cases)
//}
}
/**
* Adds the image to the queue, to be used as a background image for a component
*
* @param imgComp The component for which the image should be used after loaded
* @param imageUrl The URL this image should be fetched from
* @param styles A mask of CSSEngine.STYLE_* values indicating in which styles this background image should be displayed
*/
synchronized void addBgImage(Component imgComp,String imageUrl,int styles) {
if (HTMLComponent.SUPPORT_CSS) {
/*if ((HTMLComponent.TABLES_LOCK_SIZE) && (htmlC.curTable!=null)) {
downloadImageImmediately(imgComp,imageUrl,styles);
} else {*/
add(imgComp,imageUrl);
if ((styles & CSSEngine.STYLE_SELECTED)!=0) {
bgImageCompsSelected.addElement(imgComp);
}
if ((styles & CSSEngine.STYLE_UNSELECTED)!=0) {
bgImageCompsUnselected.addElement(imgComp);
}
if ((styles & CSSEngine.STYLE_PRESSED)!=0) {
bgImageCompsPressed.addElement(imgComp);
}
//}
}
}
/**
* Downloads the image immediately // It seems that the issue that required this was already solved in the table package
* The image is not added to the queue, and not loaded on another thread but rather downloaded on the same thread that builds up the document
* This is useful for HTMLCoponent.TABLES_PATCH
*
* @param imgComp The component for which the image should be used after loaded
* @param imageUrl The URL this image should be fetched from
* @param styles A mask of CSSEngine.STYLE_* values indicating in which styles this background image should be displayed
*
synchronized void downloadImageImmediately(Component imgComp,String imageUrl,int styles) {
try {
InputStream is = htmlC.getRequestHandler().resourceRequested(new DocumentInfo(imageUrl,DocumentInfo.TYPE_IMAGE));
Image img = Image.createImage(is);
ResourceThread t = new ResourceThread(imageUrl, imgComp, htmlC, null);
t.handleImage(img, imgComp,((styles & CSSEngine.STYLE_UNSELECTED)!=0),((styles & CSSEngine.STYLE_SELECTED)!=0),((styles & CSSEngine.STYLE_PRESSED)!=0));
} catch (Exception ex) {
ex.printStackTrace();
}
}*/
/**
* Adds a stylesheet to the queue
*
* @param cssUrl The URL this style sheet should be fetched from
* @param dom the dom object on which the CSS should be applied
*/
synchronized void addCSS(String cssUrl,String encoding) {
if (started) {
throw new IllegalStateException("ResourceThreadQueue alreadey started! stop/cancel first");
}
DocumentInfo cssDocInfo=new DocumentInfo(cssUrl, DocumentInfo.TYPE_CSS);
if (encoding!=null) {
cssDocInfo.setEncoding(encoding);
}
ResourceThread t = new ResourceThread(cssDocInfo, htmlC, this);
queue.addElement(t);
incCSSCount();
}
/**
* Incereases the internal count of the number of pending CSS documents
*/
private void incCSSCount() {
if (cssCount==-1) { // first CSS make sure we bump it from -1 to 1.
cssCount++;
}
cssCount++;
}
/**
* Returns the number of pending CSS documents
*
* @return the number of pending CSS documents
*/
synchronized int getCSSCount() {
return cssCount;
}
/**
* Returns the queue size, this is relevant only when the queue hasn't started yet
*
* @return the queue size
*/
int getQueueSize() {
return (images.size()+queue.size()); // CSS files are added directly to queue while images to the images vector
//return queue.size();
}
/**
* Notifies the queue that all images and CSS have been queues and it can start dequeuing and download the images.
* The queue isn't started before that to prevent multiple downloads of the same image
*/
synchronized void startRunning() {
if (!startDequeue()) {
startRunningImages();
}
}
/**
* Starts downloading the images (This is called only after all CSS files have been downloaded, since they may contain image references)
*/
synchronized void startRunningImages() {
queue.removeAllElements();
Vector urls=new Vector();
for(Enumeration e=images.keys();e.hasMoreElements();) {
Component imgComp = (Component)e.nextElement();
String imageUrl = (String)images.get(imgComp);
int urlIndex=urls.indexOf(imageUrl);
if (urlIndex!=-1) {
ResourceThread t=(ResourceThread)queue.elementAt(urlIndex);
t.addLabel(imgComp);
} else {
ResourceThread t = new ResourceThread(imageUrl, imgComp, htmlC, this);
queue.addElement(t);
urls.addElement(imageUrl);
}
}
urls=null;
images=new Hashtable();
if (!startDequeue()) {
htmlC.setPageStatus(HTMLCallback.STATUS_COMPLETED);
}
}
/**
* Starts dequeuing the queue into the running pool and launch them
*
* @return true if there are at least one active thread, false otherwise
*/
private synchronized boolean startDequeue() {
int threads=Math.min(queue.size(), maxThreads);
for(int i=0;i0);
}
/**
* Called by the ResourceThread when it finishes downloading and setting the image.
* This in turns starts another thread if the queue is not empty
*
* @param finishedThread The calling thread
* @param success true if the image download was successful, false otherwise
*/
synchronized void threadFinished(ResourceThread finishedThread,boolean success) {
if(finishedThread.cssDocInfo!=null) {
cssCount--; // Reduce the number of waiting CSS, even if reading failed
}
if ((HTMLComponent.SUPPORT_CSS) && (cssCount==0)) {
cssCount=-1; // So it won't get applied again
htmlC.applyAllCSS();
htmlC.cssCompleted();
}
running.removeElement(finishedThread);
if (queue.size()>0) {
ResourceThread t=(ResourceThread)queue.firstElement();
queue.removeElementAt(0);
running.addElement(t);
t.go(); //new Thread(t).start();
} else {
threadCount--;
}
if (threadCount==0) {
if (images.size()==0) {
htmlC.setPageStatus(HTMLCallback.STATUS_COMPLETED);
} else {
startRunningImages();
}
}
}
/**
* Discards the entire queue and signals the running threads to cancel.
* THis will be triggered if the user cancelled the page or moved to another page.
*/
synchronized void discardQueue() {
queue.removeAllElements();
for(Enumeration e=running.elements();e.hasMoreElements();) {
ResourceThread t = (ResourceThread)e.nextElement();
t.cancel();
}
running.removeAllElements();
bgImageCompsSelected.removeAllElements();
bgImageCompsUnselected.removeAllElements();
bgImageCompsPressed.removeAllElements();
threadCount=0;
cssCount=-1;
started=false;
}
/**
* Returns a printout of the threads queue, can be used for debugging
*
* @return a printout of the threads queue
*/
public String toString() {
String str=("---- Running ----\n");
int i=1;
for(Enumeration e=running.elements();e.hasMoreElements();) {
ResourceThread t = (ResourceThread)e.nextElement();
if (t.imageUrl!=null) {
str+="#"+i+": "+t.imageUrl+"\n";
} else {
str+="#"+i+": CSS - "+t.cssDocInfo.getUrl()+"\n";
}
i++;
}
i=1;
str+="Queue:\n";
for(Enumeration e=queue.elements();e.hasMoreElements();) {
ResourceThread t = (ResourceThread)e.nextElement();
if (t.imageUrl!=null) {
str+="#"+i+": "+t.imageUrl+"\n";
} else {
str+="#"+i+": CSS - "+t.cssDocInfo.getUrl()+"\n";
}
i++;
}
str+="---- count:"+threadCount+" ----\n";
return str;
}
// Inner classes:
/**
* An ResourceThread downloads an Image as requested
*
* @author Ofir Leitner
*/
class ResourceThread implements Runnable, IOCallback {
Component imgLabel;
Vector labels;
String imageUrl;
DocumentRequestHandler handler;
ResourceThreadQueue threadQueue;
boolean cancelled;
HTMLComponent htmlC;
Image img;
DocumentInfo cssDocInfo;
/**
* Constructs the ResourceThread for an image file
*
* @param imgLabel The label in which the image should be contained after loaded
* @param imageUrl The URL this image should be fetched from
* @param handler The RequestHandler through which to retrieve the image
* @param threadQueue The main queue, for callback purposes
*/
ResourceThread(String imageUrl, Component imgLabel,HTMLComponent htmlC,ResourceThreadQueue threadQueue) {
this.imageUrl=imageUrl;
this.imgLabel=imgLabel;
this.handler=htmlC.getRequestHandler();
this.threadQueue=threadQueue;
this.htmlC=htmlC;
}
/**
* Constructs the ResourceThread for a CSS file
*
* @param cssDocInfo A DocumentInfo object with the URL this CSS file should be fetched from
* @param handler The RequestHandler through which to retrieve the image
* @param threadQueue The main queue, for callback purposes
*/
ResourceThread(DocumentInfo cssDocInfo,HTMLComponent htmlC,ResourceThreadQueue threadQueue) {
this.cssDocInfo=cssDocInfo;
this.handler=htmlC.getRequestHandler();
this.threadQueue=threadQueue;
this.htmlC=htmlC;
}
/**
* Cancels this thread
*/
void cancel() {
cancelled=true;
}
/**
* Adds a label which has the same URL, useful for duplicate images in the same page
*
* @param label A label which has the same image URL
*/
void addLabel(Component label) {
if (labels==null) {
labels=new Vector();
}
labels.addElement(label);
}
/**
* This is the main entry point to this runnable, it checks whether the callback is synchronous or async.
* According to that it either runs this as a thread (sync) or simply calls the async method (async implements threading itself)
*/
void go() {
if (handler instanceof AsyncDocumentRequestHandler) {
DocumentInfo docInfo=cssDocInfo!=null?cssDocInfo:new DocumentInfo(imageUrl,DocumentInfo.TYPE_IMAGE);
((AsyncDocumentRequestHandler)handler).resourceRequestedAsync(docInfo, this);
} else {
Display.getInstance().startThread(this, "HTML Resources").start();
}
}
/**
* {{@inheritDoc}}
*/
public void run() {
DocumentInfo docInfo=cssDocInfo!=null?cssDocInfo:new DocumentInfo(imageUrl,DocumentInfo.TYPE_IMAGE);
InputStream is = handler.resourceRequested(docInfo);
streamReady(is, docInfo);
}
/**
* {{@inheritDoc}}
*/
public void streamReady(InputStream is,DocumentInfo docInfo) {
try {
if (is==null) {
if (htmlC.getHTMLCallback()!=null) {
htmlC.getHTMLCallback().parsingError(cssDocInfo!=null?HTMLCallback.ERROR_CSS_NOT_FOUND:HTMLCallback.ERROR_IMAGE_NOT_FOUND, null, null, null, (cssDocInfo!=null?"CSS":"Image")+" not found at "+(cssDocInfo!=null?cssDocInfo.getUrl():imageUrl));
}
} else {
if(cssDocInfo!=null) { // CSS
if (HTMLComponent.SUPPORT_CSS) { // no need to also check if loadCSS is true, since if we got so far - it is...
CSSElement result = CSSParser.getInstance().parseCSSSegment(new InputStreamReader(is),is,htmlC,cssDocInfo.getUrl());
result.setAttribute(result.getAttributeName(new Integer(CSSElement.CSS_PAGEURL)), cssDocInfo.getUrl());
htmlC.addToExternalCSS(result);
}
threadQueue.threadFinished(this,true);
return;
} else {
img=Image.createImage(is);
if (img==null) {
if (htmlC.getHTMLCallback()!=null) {
htmlC.getHTMLCallback().parsingError(HTMLCallback.ERROR_IMAGE_BAD_FORMAT, null, null, null, "Image could not be created from "+imageUrl);
}
}
}
}
if (img==null) {
threadQueue.threadFinished(this,false);
return;
}
if (!cancelled) {
Display.getInstance().callSerially(new Runnable() {
public void run() {
// prevent a redirect or another thread from breaking the UI
handleImage(img,imgLabel);
if (labels!=null) {
for(Enumeration e=labels.elements();e.hasMoreElements();) {
Component cmp=(Component)e.nextElement();
handleImage(img,cmp);
}
}
}
});
threadQueue.threadFinished(this,true);
}
} catch (IOException ioe) {
if (htmlC.getHTMLCallback()!=null) {
htmlC.getHTMLCallback().parsingError(HTMLCallback.ERROR_IMAGE_BAD_FORMAT, null, null, null, "Image could not be created from "+imageUrl+": "+ioe.getMessage());
}
if(!cancelled) {
threadQueue.threadFinished(this,false);
}
}
}
/**
* After a successful download, this handles placing the image on the label and resizing if necessary
*
* @param img The image
* @param label The label to apply the image on
*/
private void handleImage(Image img,Component cmp) {
boolean bgUnselected=(threadQueue.bgImageCompsUnselected.contains(cmp));;
boolean bgSelected=(threadQueue.bgImageCompsSelected.contains(cmp));
boolean bgPressed=(threadQueue.bgImageCompsPressed.contains(cmp));
handleImage(img, cmp,bgUnselected,bgSelected,bgPressed);
}
/**
* After a successful download, this handles placing the image on the label and resizing if necessary
*
* @param img The image
* @param cmp The component to apply the image on
* @param bgUnselected true if the image should be used as a background for the component when it is unselected, false otherwise
* @param bgSelected true if the image should be used as a background for the component when it is selected, false otherwise
* @param bgPressed true if the image should be used as a background for the component when it is pressed, false otherwise
*/
void handleImage(Image img,Component cmp,boolean bgUnselected,boolean bgSelected,boolean bgPressed) {
boolean bg=false;
if (bgUnselected) {
cmp.getUnselectedStyle().setBgImage(img);
bg=true;
}
if (bgSelected) {
cmp.getSelectedStyle().setBgImage(img);
bg=true;
}
if (bgPressed) {
if (cmp instanceof HTMLLink) {
((HTMLLink)cmp).getPressedStyle().setBgImage(img);
}
bg=true;
}
if (bg) {
cmp.repaint();
return;
}
Label label = (Label)cmp;
label.setText(""); // remove the alternate text (important to do here before checking the width/height)
// Was set in HTMLComponent.handleImage if the width/height attributes were in the tag
int width=label.getPreferredW()-label.getStyle().getPadding(Component.LEFT)-label.getStyle().getPadding(Component.RIGHT);
int height=label.getPreferredH()-label.getStyle().getPadding(Component.TOP)-label.getStyle().getPadding(Component.BOTTOM);
if (width!=0) {
if (height==0) { // If only width was specified, height should be calculated so the image keeps its aspect ratio
height=img.getHeight()*width/img.getWidth();
}
} else if (height!=0) {
if (width==0) { // If only height was specified, width should be calculated so the image keeps its aspect ratio
width=img.getWidth()*height/img.getHeight();
}
}
if (width!=0) { // if any of width or height were not 0, the other one was set to non-zero above, so this check suffices
img=img.scaled(width, height);
width+=label.getStyle().getPadding(Component.LEFT)+label.getStyle().getPadding(Component.RIGHT);
height+=label.getStyle().getPadding(Component.TOP)+label.getStyle().getPadding(Component.BOTTOM);
label.setPreferredSize(new Dimension(width,height));
}
label.setIcon(img);
htmlC.revalidate();
if (label.getClientProperty(HTMLComponent.CLIENT_PROPERTY_IMG_BORDER)==null) { // if this property is defined, it means the image had a border already
label.getUnselectedStyle().setBorder(null); //remove the border which is a sign the image is loading
} else {
int borderSize=((Integer)label.getClientProperty(HTMLComponent.CLIENT_PROPERTY_IMG_BORDER)).intValue();
// Note that padding is set here and not in handleImage since we rely on the image size (which includes padding) to know if a width/height was specified
label.getUnselectedStyle().setPadding(borderSize,borderSize,borderSize,borderSize);
label.getSelectedStyle().setPadding(borderSize,borderSize,borderSize,borderSize);
}
}
}
}
