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/*
* Copyright 1997 Phil Burk, Mobileer Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jsyn.unitgen;
import com.jsyn.ports.UnitInputPort;
/**
* Latch or hold an input value.
* <P>
* Pass a value unchanged if gate true, otherwise output held value.
* <P>
* output = ( gate > 0.0 ) ? input : previous_output;
*
* @author (C) 1997-2010 Phil Burk, Mobileer Inc
* @see EdgeDetector
*/
public class Latch extends UnitFilter {
public UnitInputPort gate;
private double held;
/* Define Unit Ports used by connect() and set(). */
public Latch() {
addPort(gate = new UnitInputPort("Gate"));
}
@Override
public void generate(int start, int limit) {
double[] inputs = input.getValues();
double[] gates = gate.getValues();
double[] outputs = output.getValues();
for (int i = start; i < limit; i++) {
if (gates[i] > 0.0) {
held = inputs[i];
}
outputs[i] = held;
}
}
}
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