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/*
* Copyright Dept. of Mathematics & Computer Science Univ. Paris-Descartes
*
* This software is governed by the CeCILL license under French law and
* abiding by the rules of distribution of free software. You can use,
* modify and/ or redistribute the software under the terms of the CeCILL
* license as circulated by CEA, CNRS and INRIA at the following URL
* "http://www.cecill.info".
*
* As a counterpart to the access to the source code and rights to copy,
* modify and redistribute granted by the license, users are provided only
* with a limited warranty and the software's author, the holder of the
* economic rights, and the successive licensors have only limited
* liability.
*
* In this respect, the user's attention is drawn to the risks associated
* with loading, using, modifying and/or developing or reproducing the
* software by the user in light of its specific status of free software,
* that may mean that it is complicated to manipulate, and that also
* therefore means that it is reserved for developers and experienced
* professionals having in-depth computer knowledge. Users are therefore
* encouraged to load and test the software's suitability as regards their
* requirements in conditions enabling the security of their systems and/or
* data to be ensured and, more generally, to use and operate it in the
* same conditions as regards security.
*
* The fact that you are presently reading this means that you have had
* knowledge of the CeCILL license and that you accept its terms.
*/
package pddl4j.exp.term;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import pddl4j.exp.AbstractExp;
import pddl4j.exp.ExpID;
import pddl4j.exp.type.Type;
import pddl4j.exp.type.TypeSet;
/**
* This abstract class implements the common part of all term used in PDDL language.
*
* @author Damien Pellier
* @version 1.0
*/
public abstract class AbstractTerm extends AbstractExp implements Term {
/**
* The serial version id of the class.
*/
private static final long serialVersionUID = 4052803386962040209L;
/**
* The image of the term.
*/
private String image;
/**
* The type of the term.
*/
private TypeSet type;
/**
* The term id of this term.
*/
private TermID id;
/**
* Creates a new term with a specified term id, image type and gound flag
* property.
*
* @param id The id expression of this term.
* @param image the image of the term.
* @throws NullPointerException if <code>id == null</code> or
* <code>image == null</code> or <code>type == null</code>.
*/
protected AbstractTerm(TermID id, String image) {
super(ExpID.TERM);
this.id = id;
this.setImage(image);
Map<String, Set<String>> type = new LinkedHashMap<String,Set<String>>();
type.put(Type.OBJECT_SYMBOL, new LinkedHashSet<String>());
this.setTypeSet(new TypeSet(new Type(Type.OBJECT_SYMBOL, type)));
}
/**
* Creates a new term with a specified term id, image type and ground flag
* property.
*
* @param id The id expression of this term.
* @param image the image of the term.
* @param type the type of this term.
* @throws NullPointerException if <code>id == null</code> or
* <code>image == null</code> or <code>type == null</code>.
*/
protected AbstractTerm(TermID id, String image, TypeSet type) {
super(ExpID.TERM);
this.id = id;
this.setImage(image);
this.setTypeSet(type);
}
/**
* Returns the term id of this term.
*
* @return the expression id of this term.
*/
public final TermID getTermID() {
return this.id;
}
/**
* Returns the image of this term.
*
* @return the image of this term.
*/
public final String getImage() {
return this.image;
}
/**
* Sets a new image to this term.
*
* @param image the new image of the term.
* @throws NullPointerException if <code>image == null</code>.
*/
protected void setImage(String image) {
if (image == null)
throw new NullPointerException();
this.image = image;
}
/**
* Returns the type of the term.
*
* @return the type of the term.
*/
public final TypeSet getTypeSet() {
return this.type;
}
/**
* Sets a new type to this term.
*
* @param type the new type to set to this term.
* @throws NullPointerException if <code>type == null</code>.
*/
protected void setTypeSet(TypeSet type) {
if (type == null)
throw new NullPointerException();
this.type = type;
}
/* /**
* Returns <code>true</code> if this term is an instance of a specified
* type. Specially, this method returns <code>true</code> if the type
* of this term is the equal to the specified type or if the type of this
* term is a subtype of the specified type.
*
* @param type the type.
* @return <code>true</code> if this type is an instance of a specified
* type; <code>false</code> otherwise.
* @throws NullPointerException if <code>type == null</code>.
*/
/* public boolean isInstanceOf(Type type) {
if (type == null)
throw new NullPointerException();
return this.gequals(type) || type.getAllSubTypes().contains(this);
}*/
/**
* Returns a deep copy of this term.
*
* @return a deep copy of this term.
* @see java.lang.Cloneable
*/
public AbstractTerm clone() {
AbstractTerm other = (AbstractTerm) super.clone();
other.type = this.type.clone();
return other;
}
/**
* Returns the negative normal form of this expression. Note, the expression
* returned is a copy.
*
* @return the negative normal form of this expression.
* @see pddl4j.exp.Exp#toNegativeNormalForm()
*/
public Term toNegativeNormalForm() {
return this.clone();
}
/**
* Returns <code>true</code> if this term is equals to an other object,
* i.e., if the object is a not null instance of the class
* <code>AbstractTerm</code> and both term have the same image.
*
* @param obj the object to compare.
* @return <code>true</code> if this function head is equals to an other
* object; <code>false</code> otherwise.
*/
public boolean equals(final Object obj) {
if (obj != null && obj instanceof AbstractTerm) {
final AbstractTerm other = (AbstractTerm) obj;
return super.equals(other) && this.id.equals(other.id)
&& this.getImage().equals(other.getImage());
}
return false;
}
/**
* Returns the hash code value of this term. This method is supported
* for the benefit of hash tables such as those provided by
* <code>java.util.Hashtable</code>.
*
* @return the hash code value of this term.
* @see java.lang.Object#hashCode()
*/
public int hashCode() {
return super.hashCode() + this.id.hashCode() + this.getImage().hashCode();
}
/**
* Returns <code>true</code> if this term is numeric.
*
* @return <code>true</code> if this term is numeric; <code>false</code>
* otherwise.
*/
/*public final boolean isNumeric() {
return this.type.isNumber();
}*/
}
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