/*
* Copyright (c) 2010 Mathew Hall, University of Sheffield.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* Neither the name of the University of Sheffield nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package search.genes;
import static gpinterpreter.vector.VecSymbol.MOVE;
import static gpinterpreter.vector.VecSymbol.NOP;
import gpinterpreter.vector.VecInstruction;
import gpinterpreter.vector.VecSymbol;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.jgap.Configuration;
import org.jgap.Gene;
import org.jgap.InvalidConfigurationException;
import org.jgap.impl.IntegerGene;
/**
* Represents an instruction as an integer, using bit twiddling to turn it into
* an VecInstruction. For now at least subclassing IntegerGene fails on JGAP 3.5 so
* use an IntegerGene as your Chromosome then the static method to turn it into
* an instruction for GPInterpreter.
*/
public class IntegerInstructionGene extends IntegerGene implements
InstructionGene {
public int graphSize;
private static VecSymbol[] symbols = {MOVE, /* SPLIT, */ NOP // ,MERGE
};
protected Gene newGeneInternal() {
try {
IntegerInstructionGene result = new IntegerInstructionGene(getConfiguration());
result.setGraphSize(graphSize);
return result;
} catch (InvalidConfigurationException iex) {
throw new IllegalStateException(iex.getMessage());
}
}
public void setGraphSize(int s) {
graphSize = s;
}
public int getGraphSize() {
return graphSize;
}
public InstructionGene clone() {
IntegerInstructionGene ig;
try {
ig = new IntegerInstructionGene(this.getConfiguration());
} catch (InvalidConfigurationException ex) {
Logger.getLogger(IntegerInstructionGene.class.getName()).log(Level.SEVERE, null, ex);
throw new RuntimeException("Attempt to clone an IntegerInstructionGene failed.");
}
ig.setGraphSize(graphSize);
ig.setAllele(new Integer(intValue()));
return ig;
}
public IntegerInstructionGene(Configuration a_config, int size) throws InvalidConfigurationException{
this(a_config);
graphSize = size;
}
public IntegerInstructionGene(Configuration a_config)
throws InvalidConfigurationException {
super(a_config);
}
private static final long serialVersionUID = 1L;
private static VecSymbol getSymbol(int val) {
int instruction = val >>> 30;
switch (instruction) {
case 0:
case 1:
return MOVE;
// break;
case 2:
case 3:
default:
return NOP;
// break;
}
}
/**
* Decode the Integer representation to an executable VecInstruction.
*/
public static VecInstruction getInstruction(int val, int graphSize) {
VecSymbol operator = getSymbol(val);
int lower = val & 0x7FFF;
int higher = (val >>> 15) & 0x7FFF;
lower = (lower % (graphSize)) + 1;
higher = (higher % (graphSize)) + 1;
return new VecInstruction(operator, lower, higher, -1);
}
public VecInstruction getInstruction() {
return getInstruction(intValue(), graphSize);
}
public String toString() {
return getInstruction().toString();
}
}