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/* {{{ License.
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */ //}}}

// :indentSize=4:lineSeparator=\n:noTabs=false:tabSize=4:folding=explicit:collapseFolds=0:
package org.mathpiper.lisp.userfunctions;

import java.util.Iterator;
import org.mathpiper.builtin.BuiltinContainer;
import org.mathpiper.builtin.PatternContainer;
import org.mathpiper.lisp.cons.ConsPointer;
import org.mathpiper.lisp.Environment;
import org.mathpiper.lisp.LispError;
import org.mathpiper.lisp.parametermatchers.Pattern;

 * A rule which matches if the corresponding {@link PatternContainer} matches.
00031 public class PatternBranch extends Branch {

    protected int iPrecedence;    /// The body of this rule.
00034     protected ConsPointer iBody = new ConsPointer();    /// Generic object of type \c PatternContainer containing #iPatternClass
00035     protected ConsPointer iPredicate = new ConsPointer();    /// The pattern that decides whether this rule matches.
00036     protected PatternContainer iPatternClass;

    /// Constructor.
     * @param aPrecedence precedence of the rule
     * @param aPredicate getObject object of type PatternContainer
     * @param aBody body of the rule
00045     public PatternBranch(int aPrecedence, ConsPointer aPredicate, ConsPointer aBody) throws Exception {
        iPatternClass = null;
        iPrecedence = aPrecedence;

        BuiltinContainer gen = (BuiltinContainer) aPredicate.car();
        LispError.check(gen != null, LispError.INVALID_ARGUMENT);
        LispError.check(gen.typeName().equals("\"Pattern\""), LispError.INVALID_ARGUMENT);

        iPatternClass = (PatternContainer) gen;

    /// Return true if the corresponding pattern matches.
00059     public boolean matches(Environment aEnvironment, ConsPointer[] aArguments) throws Exception {
        return iPatternClass.matches(aEnvironment, aArguments);

    /// Access #iPrecedence
00064     public int getPrecedence() {
        return iPrecedence;

    public ConsPointer getPredicatePointer() {
        return this.iPredicate;

    public Pattern getPattern() {
        return iPatternClass.getPattern();

    /// Access #iBody
00077     public ConsPointer getBodyPointer() {
        return iBody;
    }    /// The precedence of this rule.

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