/*
* This file is part of JGAP.
*
* JGAP offers a dual license model containing the LGPL as well as the MPL.
*
* For licensing information please see the file license.txt included with JGAP
* or have a look at the top of class org.jgap.Chromosome which representatively
* includes the JGAP license policy applicable for any file delivered with JGAP.
*/
package org.jgap.gp.function;
import org.apache.commons.lang.builder.*;
import org.jgap.*;
import org.jgap.gp.*;
import org.jgap.gp.impl.*;
import org.jgap.util.*;
/**
* Returns a single character out of a set of given characters. The decision
* which character to return is controlled by a child of this command which in
* turn returns an integer index.
*
* @author Klaus Meffert
* @since 3.4.3
*/
public class CharacterProvider
extends CommandGene implements ICloneable {
/** String containing the CVS revision. Read out via reflection!*/
private final static String CVS_REVISION = "$Revision: 1.2 $";
/**
* Alphabet of valid characters.
*/
private String m_alphabet;
public CharacterProvider(final GPConfiguration a_conf, Class a_returnType,
String a_alphabet)
throws InvalidConfigurationException {
this(a_conf, a_returnType, a_alphabet, 0);
}
public CharacterProvider(final GPConfiguration a_conf, Class a_returnType,
String a_alphabet, int a_subReturnType)
throws InvalidConfigurationException {
super(a_conf, 1, a_returnType, a_subReturnType, null);
if (a_alphabet == null || a_alphabet.length() < 1) {
throw new IllegalArgumentException("Alphabet must not be empty!");
}
m_alphabet = a_alphabet;
}
public String toString() {
return "character(" + m_alphabet + ")";
}
/**
* @return textual name of this command
*
* @author Klaus Meffert
* @since 3.2
*/
public String getName() {
return "Character";
}
public Object execute_object(ProgramChromosome c, int n, Object[] args) {
int index = c.execute_int(n, 0, args);
try {
return m_alphabet.charAt(index);
} catch (ArrayIndexOutOfBoundsException iex) {
throw new IllegalStateException(
"CharacterProvider: child returned invalid index");
}
}
/**
* The compareTo-method.
*
* @param a_other the other object to compare
* @return -1, 0, 1
*
* @author Klaus Meffert
* @since 3.4.3
*/
public int compareTo(Object a_other) {
int result = super.compareTo(a_other);
if (result != 0) {
return result;
}
CharacterProvider other = (CharacterProvider) a_other;
return new CompareToBuilder()
.append(m_alphabet, other.m_alphabet)
.toComparison();
}
/**
* The equals-method.
*
* @param a_other the other object to compare
* @return true if the objects are seen as equal
*
* @author Klaus Meffert
* @since 3.4.3
*/
public boolean equals(Object a_other) {
try {
CharacterProvider other = (CharacterProvider) a_other;
return super.equals(a_other) && new EqualsBuilder()
.append(m_alphabet, other.m_alphabet)
.isEquals();
} catch (ClassCastException cex) {
return false;
}
}
/**
* Clones the object. Simple and straight forward implementation here.
*
* @return cloned instance of this object
*
* @author Klaus Meffert
* @since 3.4.3
*/
public Object clone() {
try {
CharacterProvider result = new CharacterProvider(getGPConfiguration(),
getReturnType(), m_alphabet, getSubReturnType());
return result;
} catch (Exception ex) {
throw new CloneException(ex);
}
}
}