oshi.hardware.platform.linux.LinuxDisplay Maven / Gradle / Ivy
/**
* Oshi (https://github.com/dblock/oshi)
*
* Copyright (c) 2010 - 2016 The Oshi Project Team
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Maintainers:
* dblock[at]dblock[dot]org
* widdis[at]gmail[dot]com
* enrico.bianchi[at]gmail[dot]com
*
* Contributors:
* https://github.com/dblock/oshi/graphs/contributors
*/
package oshi.hardware.platform.linux;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import oshi.hardware.Display;
import oshi.hardware.common.AbstractDisplay;
import oshi.hardware.platform.unix.solaris.SolarisDisplay;
import oshi.util.ExecutingCommand;
import oshi.util.ParseUtil;
/**
* A Display
*
* @author widdis[at]gmail[dot]com
*/
public class LinuxDisplay extends AbstractDisplay {
private static final long serialVersionUID = 1L;
private static final Logger LOG = LoggerFactory.getLogger(LinuxDisplay.class);
public LinuxDisplay(byte[] edid) {
super(edid);
LOG.debug("Initialized LinuxDisplay");
}
/**
* Gets Display Information
*
* @return An array of Display objects representing monitors, etc.
*/
public static Display[] getDisplays() {
List xrandr = ExecutingCommand.runNative("xrandr --verbose");
// xrandr reports edid in multiple lines. After seeing a line containing
// EDID, read subsequent lines of hex until 256 characters are reached
if (xrandr.isEmpty()) {
return new Display[0];
}
List displays = new ArrayList<>();
StringBuilder sb = null;
for (String s : xrandr) {
if (s.contains("EDID")) {
sb = new StringBuilder();
} else if (sb != null) {
sb.append(s.trim());
if (sb.length() < 256) {
continue;
}
String edidStr = sb.toString();
LOG.debug("Parsed EDID: {}", edidStr);
byte[] edid = ParseUtil.hexStringToByteArray(edidStr);
if (edid.length >= 128) {
displays.add(new SolarisDisplay(edid));
}
sb = null;
}
}
return displays.toArray(new Display[displays.size()]);
}
}