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package com.diozero.api;
/*
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: WaitableDigitalInputDevice.java
*
* This file is part of the diozero project. More information about this project
* can be found at http://www.diozero.com/
* %%
* Copyright (C) 2016 - 2020 diozero
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
import com.diozero.internal.provider.GpioDeviceFactoryInterface;
import com.diozero.util.DeviceFactoryHelper;
import com.diozero.util.Event;
import com.diozero.util.RuntimeIOException;
/**
* Represents a digital input device with distinct waitable states (active / inactive).
*/
public class WaitableDigitalInputDevice extends DigitalInputDevice {
private Event highEvent = new Event();
private Event lowEvent = new Event();
/**
* @param gpio GPIO to which the device is connected.
* @throws RuntimeIOException If an I/O error occurred.
*/
public WaitableDigitalInputDevice(int gpio) throws RuntimeIOException {
this(DeviceFactoryHelper.getNativeDeviceFactory(), gpio, GpioPullUpDown.NONE, GpioEventTrigger.BOTH);
}
/**
* @param gpio GPIO to which the device is connected.
* @param pud Pull up/down configuration, values: NONE, PULL_UP, PULL_DOWN.
* @param trigger Event trigger configuration, values: NONE, RISING, FALLING, BOTH.
* @throws RuntimeIOException If an I/O error occurred.
*/
public WaitableDigitalInputDevice(int gpio, GpioPullUpDown pud, GpioEventTrigger trigger) throws RuntimeIOException {
this(DeviceFactoryHelper.getNativeDeviceFactory(), gpio, pud, trigger);
}
/**
* @param deviceFactory Device factory to use to construct the device.
* @param gpio GPIO to which the device is connected.
* @param pud Pull up/down configuration, values: NONE, PULL_UP, PULL_DOWN.
* @param trigger Event trigger configuration, values: NONE, RISING, FALLING, BOTH.
* @throws RuntimeIOException If an I/O error occurred.
*/
public WaitableDigitalInputDevice(GpioDeviceFactoryInterface deviceFactory, int gpio,
GpioPullUpDown pud, GpioEventTrigger trigger) throws RuntimeIOException {
super(deviceFactory, gpio, pud, trigger);
enableDeviceListener();
}
@Override
protected void disableDeviceListener() {
// Never disable the device listener
}
@Override
public void valueChanged(DigitalInputEvent event) {
Event e = event.getValue() ? highEvent : lowEvent;
e.set();
// Notify any listeners
super.valueChanged(event);
}
/**
* Wait indefinitely for the device state to go active.
* @return False if timed out waiting for the specified value, otherwise true.
* @throws InterruptedException If interrupted while waiting.-
*/
public boolean waitForActive() throws InterruptedException {
return waitForActive(0);
}
/**
* Wait the specified time period for the device state to go active.
* @param timeout Timeout value if milliseconds, <= 0 is indefinite.
* @return False if timed out waiting for the specified value, otherwise true.
* @throws InterruptedException If interrupted while waiting.-
*/
public boolean waitForActive(int timeout) throws InterruptedException {
return waitForValue(activeHigh, timeout);
}
/**
* Wait indefinitely for the device state to go inactive.
* @return False if timed out waiting for the specified value, otherwise true.
* @throws InterruptedException If interrupted while waiting.-
*/
public boolean waitForInactive() throws InterruptedException {
return waitForInactive(0);
}
/**
* Wait the specified time period for the device state to go inactive.
* @param timeout Timeout value if milliseconds, <= 0 is indefinite.
* @return False if timed out waiting for the specified value, otherwise true.
* @throws InterruptedException If interrupted while waiting.-
*/
public boolean waitForInactive(int timeout) throws InterruptedException {
return waitForValue(!activeHigh, timeout);
}
/**
* Wait the specified time period for the device state to switch to value.
* @param value The desired device state to wait for.
* @param timeout Timeout value if milliseconds, <= 0 is indefinite.
* @return False if timed out waiting for the specified value, otherwise true.
* @throws InterruptedException If interrupted while waiting.-
*/
public boolean waitForValue(boolean value, int timeout) throws InterruptedException {
Event e = value ? highEvent : lowEvent;
if (timeout > 0) {
return e.doWait(timeout);
}
return e.doWait();
}
}
