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/*
* Copyright © 2010 Anthony Towns <aj@erisian.com.au>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program 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 for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
package org.altusmetrum.altosuilib_2;
import javax.swing.*;
import javax.imageio.ImageIO;
import java.awt.image.*;
import java.awt.*;
import java.io.*;
import java.net.*;
class AltosCacheImage {
Component component;
File file;
VolatileImage image;
int width;
int height;
long used;
public void load_image() throws IOException {
BufferedImage bimg = ImageIO.read(file);
if (bimg == null)
throw new IOException("Can't load image file");
Graphics2D g = image.createGraphics();
g.drawImage(bimg, 0, 0, null);
bimg.flush();
bimg = null;
}
public Image validate() {
int returnCode;
if (image != null)
returnCode = image.validate(component.getGraphicsConfiguration());
else
returnCode = VolatileImage.IMAGE_INCOMPATIBLE;
if (returnCode == VolatileImage.IMAGE_RESTORED) {
try {
load_image();
} catch (IOException e) {
return null;
}
} else if (returnCode == VolatileImage.IMAGE_INCOMPATIBLE) {
image = component.createVolatileImage(width, height);
try {
load_image();
} catch (IOException e) {
return null;
}
}
return image;
}
public void flush() {
image.flush();
}
public AltosCacheImage(Component component, File file, int w, int h) throws IOException {
this.component = component;
this.file = file;
width = w;
height = h;
image = component.createVolatileImage(w, h);
used = 0;
}
}
public class AltosSiteMapCache {
static final long google_maps_ratelimit_ms = 1200;
// Google limits static map queries to 50 per minute per IP, so
// each query should take at least 1.2 seconds.
static final int success = 0;
static final int loading = 1;
static final int failed = 2;
static final int bad_request = 3;
static final int forbidden = 4;
public static boolean has_map(File file, String url) {
return file.exists();
}
static long forbidden_time;
static boolean forbidden_set = false;
static final long forbidden_interval = 60l * 1000l * 1000l * 1000l;
public static synchronized int fetch_map(File file, String url) {
if (file.exists())
return success;
if (forbidden_set && (System.nanoTime() - forbidden_time) < forbidden_interval)
return forbidden;
URL u;
long startTime = System.nanoTime();
try {
u = new URL(url);
} catch (java.net.MalformedURLException e) {
return bad_request;
}
byte[] data;
URLConnection uc = null;
try {
uc = u.openConnection();
String type = uc.getContentType();
int contentLength = uc.getContentLength();
if (uc instanceof HttpURLConnection) {
int response = ((HttpURLConnection) uc).getResponseCode();
switch (response) {
case HttpURLConnection.HTTP_FORBIDDEN:
case HttpURLConnection.HTTP_PAYMENT_REQUIRED:
case HttpURLConnection.HTTP_UNAUTHORIZED:
forbidden_time = System.nanoTime();
forbidden_set = true;
return forbidden;
}
}
InputStream in = new BufferedInputStream(uc.getInputStream());
int bytesRead = 0;
int offset = 0;
data = new byte[contentLength];
while (offset < contentLength) {
bytesRead = in.read(data, offset, data.length - offset);
if (bytesRead == -1)
break;
offset += bytesRead;
}
in.close();
if (offset != contentLength)
return failed;
} catch (IOException e) {
return failed;
}
try {
FileOutputStream out = new FileOutputStream(file);
out.write(data);
out.flush();
out.close();
} catch (FileNotFoundException e) {
return bad_request;
} catch (IOException e) {
if (file.exists())
file.delete();
return bad_request;
}
long duration_ms = (System.nanoTime() - startTime) / 1000000;
if (duration_ms < google_maps_ratelimit_ms) {
try {
Thread.sleep(google_maps_ratelimit_ms - duration_ms);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
return success;
}
static final int cache_size = 12;
static AltosCacheImage[] images;
static long used;
public static Image get_image(Component component, File file, int width, int height) {
int oldest = -1;
long age = used;
AltosCacheImage image;
if (images == null)
images = new AltosCacheImage[cache_size];
for (int i = 0; i < cache_size; i++) {
image = images[i];
if (image == null) {
oldest = i;
break;
}
if (image.component == component && file.equals(image.file)) {
image.used = used++;
return image.validate();
}
if (image.used < age) {
oldest = i;
age = image.used;
}
}
try {
image = new AltosCacheImage(component, file, width, height);
image.used = used++;
if (images[oldest] != null)
images[oldest].flush();
images[oldest] = image;
return image.validate();
} catch (IOException e) {
return null;
}
}
}
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