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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.5.0_07) on Tue Oct 16 12:57:42 EDT 2007 --><TITLE>DomainElement</TITLE><META NAME="keywords" CONTENT="JSHOP2.DomainElement class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="DomainElement";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../JSHOP2/package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../JSHOP2/Domain.html" title="class in JSHOP2"><B>PREV CLASS</B></A> <A HREF="../JSHOP2/Equal.html" title="class in JSHOP2"><B>NEXT 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======== --><H2><FONT SIZE="-1">JSHOP2</FONT><BR>Class DomainElement</H2><PRE>java.lang.Object <IMG SRC="../resources/inherit.gif" ALT="extended by "><B>JSHOP2.DomainElement</B></PRE><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../JSHOP2/Axiom.html" title="class in JSHOP2">Axiom</A>, <A HREF="../JSHOP2/Method.html" title="class in JSHOP2">Method</A>, <A HREF="../JSHOP2/Operator.html" title="class in JSHOP2">Operator</A></DD></DL><HR><DL><DT><PRE>public abstract class <B>DomainElement</B><DT>extends java.lang.Object</DL></PRE><P>This abstract class implements the basic common functionality of the all possible elements (i.e., methods, operators, and axioms) of a domain at run time.<P><P><DL><DT><B>Version:</B></DT> <DD>1.0.3</DD><DT><B>Author:</B></DT> <DD>Okhtay Ilghami, <a href="http://www.cs.umd.edu/~okhtay">http://www.cs.umd.edu/~okhtay</a></DD></DL><HR><P><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Field Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>private <A HREF="../JSHOP2/Predicate.html" title="class in JSHOP2">Predicate</A></CODE></FONT></TD><TD><CODE><B><A HREF="../JSHOP2/DomainElement.html#head">head</A></B></CODE><BR> Every element has a head, which is a predicate.</TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../JSHOP2/DomainElement.html#DomainElement(JSHOP2.Predicate)">DomainElement</A></B>(<A HREF="../JSHOP2/Predicate.html" title="class in JSHOP2">Predicate</A> headIn)</CODE><BR> To initialize the domain element.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Method Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../JSHOP2/Predicate.html" title="class in JSHOP2">Predicate</A></CODE></FONT></TD><TD><CODE><B><A HREF="../JSHOP2/DomainElement.html#getHead()">getHead</A></B>()</CODE><BR> This function returns the head of this domain element.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract <A HREF="../JSHOP2/Precondition.html" title="class in JSHOP2">Precondition</A></CODE></FONT></TD><TD><CODE><B><A HREF="../JSHOP2/DomainElement.html#getIterator(JSHOP2.Term[], int)">getIterator</A></B>(<A HREF="../JSHOP2/Term.html" title="class in JSHOP2">Term</A>[] binding, int which)</CODE><BR> This abstract function returns a handle that can be used to calculate, one by one, the bindings that satisfy the precondition of this domain element in a given state of the world with respect to a given binding.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../JSHOP2/Term.html" title="class in JSHOP2">Term</A>[]</CODE></FONT></TD><TD><CODE><B><A HREF="../JSHOP2/DomainElement.html#unify(JSHOP2.Predicate)">unify</A></B>(<A HREF="../JSHOP2/Predicate.html" title="class in JSHOP2">Predicate</A> p)</CODE><BR> This function returns the substitution that unifies the head of this element with a given predicate.</TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><A NAME="field_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"><B>Field Detail</B></FONT></TH></TR></TABLE><A NAME="head"><!-- --></A><H3>head</H3><PRE>private <A HREF="../JSHOP2/Predicate.html" title="class in JSHOP2">Predicate</A> <B>head</B></PRE><DL><DD>Every element has a head, which is a predicate.<P><DL></DL></DL><!-- ========= CONSTRUCTOR DETAIL ======== --><A NAME="constructor_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"><B>Constructor Detail</B></FONT></TH></TR></TABLE><A NAME="DomainElement(JSHOP2.Predicate)"><!-- --></A><H3>DomainElement</H3><PRE>public <B>DomainElement</B>(<A HREF="../JSHOP2/Predicate.html" title="class in JSHOP2">Predicate</A> headIn)</PRE><DL><DD>To initialize the domain element.<P><DL><DT><B>Parameters:</B><DD><CODE>headIn</CODE> - head of the domain element.</DL></DL><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"><B>Method Detail</B></FONT></TH></TR></TABLE><A NAME="getHead()"><!-- --></A><H3>getHead</H3><PRE>public <A HREF="../JSHOP2/Predicate.html" title="class in JSHOP2">Predicate</A> <B>getHead</B>()</PRE><DL><DD>This function returns the head of this domain element.<P><DD><DL><DT><B>Returns:</B><DD>the head of this element, which is a predicate.</DL></DD></DL><HR><A NAME="getIterator(JSHOP2.Term[], int)"><!-- --></A><H3>getIterator</H3><PRE>public abstract <A HREF="../JSHOP2/Precondition.html" title="class in JSHOP2">Precondition</A> <B>getIterator</B>(<A HREF="../JSHOP2/Term.html" title="class in JSHOP2">Term</A>[] binding, int which)</PRE><DL><DD>This abstract function returns a handle that can be used to calculate, one by one, the bindings that satisfy the precondition of this domain element in a given state of the world with respect to a given binding.<P><DD><DL><DT><B>Parameters:</B><DD><CODE>binding</CODE> - current binding.<DD><CODE>which</CODE> - which precondition to use (ignored if this element is an operator, since operators have only one precondition).<DT><B>Returns:</B><DD>an object of type Precondition which can be used later on to get the bindings one by one.</DL></DD></DL><HR><A NAME="unify(JSHOP2.Predicate)"><!-- --></A><H3>unify</H3><PRE>public <A HREF="../JSHOP2/Term.html" title="class in JSHOP2">Term</A>[] <B>unify</B>(<A HREF="../JSHOP2/Predicate.html" title="class in JSHOP2">Predicate</A> p)</PRE><DL><DD>This function returns the substitution that unifies the head of this element with a given predicate.<P><DD><DL><DT><B>Parameters:</B><DD><CODE>p</CODE> - input predicate<DT><B>Returns:</B><DD>an array that shows with what each variable should be substituted.</DL></DD></DL><!-- ========= END OF CLASS DATA ========= --><HR><!-- ======= START OF BOTTOM NAVBAR ====== --><A NAME="navbar_bottom"><!-- --></A><A HREF="#skip-navbar_bottom" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR 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