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/*
* Copyright © 2014 Keith Packard <keithp@keithp.com>
*
* 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_6;
import java.io.*;
import java.net.*;
import java.util.*;
public class AltosUIMapStore {
String url;
File file;
LinkedList<AltosUIMapStoreListener> listeners = new LinkedList<AltosUIMapStoreListener>();
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;
int status;
public int status() {
return status;
}
public synchronized void add_listener(AltosUIMapStoreListener listener) {
if (!listeners.contains(listener))
listeners.add(listener);
}
public synchronized void remove_listener(AltosUIMapStoreListener listener) {
listeners.remove(listener);
}
private synchronized void notify_listeners(int status) {
this.status = status;
for (AltosUIMapStoreListener listener : listeners)
listener.notify_store(this, status);
}
static Object forbidden_lock = new Object();
static long forbidden_time;
static boolean forbidden_set;
private int fetch_url() {
URL u;
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:
synchronized (forbidden_lock) {
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;
}
return success;
}
static Object fetch_lock = new Object();
static final long forbidden_interval = 60l * 1000l * 1000l * 1000l;
static final long google_maps_ratelimit_ms = 1200;
class loader implements Runnable {
public void run() {
if (file.exists()) {
notify_listeners(success);
return;
}
synchronized(forbidden_lock) {
if (forbidden_set && (System.nanoTime() - forbidden_time) < forbidden_interval) {
notify_listeners(forbidden);
return;
}
}
int new_status;
if (!AltosUIVersion.has_google_maps_api_key()) {
synchronized (fetch_lock) {
long startTime = System.nanoTime();
new_status = fetch_url();
if (new_status == success) {
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();
}
}
}
}
} else {
new_status = fetch_url();
}
notify_listeners(new_status);
}
}
private void load() {
loader l = new loader();
Thread lt = new Thread(l);
lt.start();
}
private AltosUIMapStore (String url, File file) {
this.url = url;
this.file = file;
if (file.exists())
status = success;
else {
status = loading;
load();
}
}
public boolean equals(AltosUIMapStore other) {
return url.equals(other.url);
}
static HashMap<String,AltosUIMapStore> stores = new HashMap<String,AltosUIMapStore>();
public static AltosUIMapStore get(String url, File file) {
AltosUIMapStore store;
synchronized(stores) {
if (stores.containsKey(url)) {
store = stores.get(url);
} else {
store = new AltosUIMapStore(url, file);
stores.put(url, store);
}
}
return store;
}
}
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