com.sun.glass.ui.monocle.LinuxAbsoluteInputCapabilities Maven / Gradle / Ivy
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* 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.
*
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* 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).
*
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package com.sun.glass.ui.monocle;
import java.io.File;
import java.io.IOException;
import java.util.BitSet;
import java.util.HashMap;
import java.util.Map;
/** Describes the capabilities of Linux input devices with absolute
* coordinates. See /usr/include/linux/input.h */
class LinuxAbsoluteInputCapabilities {
private int value;
private int minimum;
private int maximum;
private int fuzz;
private int flat;
private int resolution;
LinuxAbsoluteInputCapabilities(int value, int maximum, int minimum,
int fuzz, int flat, int resolution) {
this.value = value;
this.maximum = maximum;
this.minimum = minimum;
this.fuzz = fuzz;
this.flat = flat;
this.resolution = resolution;
}
private LinuxAbsoluteInputCapabilities(LinuxSystem system,
LinuxSystem.InputAbsInfo info,
long fd, int axis) throws IOException {
system.ioctl(fd, system.EVIOCGABS(axis), info.p);
value = LinuxSystem.InputAbsInfo.getValue(info.p);
minimum = LinuxSystem.InputAbsInfo.getMinimum(info.p);
maximum = LinuxSystem.InputAbsInfo.getMaximum(info.p);
fuzz = LinuxSystem.InputAbsInfo.getFuzz(info.p);
flat = LinuxSystem.InputAbsInfo.getFlat(info.p);
resolution = LinuxSystem.InputAbsInfo.getResolution(info.p);
}
/** Reads capabilities from a device node.
*
* @return A Map of capabilities for each supported axis, or null if no
* capabilities are available.
* @throws IOException if an error occured when reading capabilities
* */
static Map getCapabilities(
File devNode, BitSet axes) throws IOException {
if (axes == null || axes.isEmpty()) {
return null;
}
LinuxSystem system = LinuxSystem.getLinuxSystem();
LinuxSystem.InputAbsInfo info = new LinuxSystem.InputAbsInfo();
long fd = system.open(devNode.getPath(), LinuxSystem.O_RDONLY);
if (fd == -1) {
throw new IOException(system.getErrorMessage());
}
Map caps =
new HashMap();
for (int i = 0; (i = axes.nextSetBit(i)) != -1; i++) {
caps.put(i, new LinuxAbsoluteInputCapabilities(system, info, fd, i));
}
system.close(fd);
return caps;
}
int getValue() {
return value;
}
int getMinimum() {
return minimum;
}
int getMaximum() {
return maximum;
}
int getFuzz() {
return fuzz;
}
int getFlat() {
return flat;
}
int getResolution() {
return resolution;
}
}