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/* Compound.java
* =========================================================================
* This file is part of the GrInvIn project - http://www.grinvin.org
*
* Copyright (C) 2005-2008 Universiteit Gent
*
* 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 (at
* your option) 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* A copy of the GNU General Public License can be found in the file
* LICENSE.txt provided with the source distribution of this program (see
* the META-INF directory in the source jar). This license can also be
* found on the GNU website at http://www.gnu.org/licenses/gpl.html.
*
* If you did not receive a copy of the GNU General Public License along
* with this program, contact the lead developer, or write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
package org.grinvin.expr;
/**
* Compound expression, i.e., an expression containing one or several 'sub-expressions'.
*/
public class Compound implements Expression {
//
private final Operator operator;
/**
* Get the operator for this expression.
*/
public Operator getOperator() {
return operator;
}
/**
* The number of argument children for this compound expression.
*/
public int getNumberOfChildren () {
return children.length;
}
/**
* Return the child with the given index.
*/
public Expression getChild (int index) {
return children[index];
}
//
private final Expression[] children;
//
public void accept(Expression.Visitor visitor) {
visitor.visitCompound(this);
}
/**
* Create an expression which applies the given operator to the
* given array of arguments.
*/
public Compound (Operator operator, Expression[] children) {
assert operator.getNumberOfArguments () == children.length;
this.operator = operator;
this.children = children.clone();
}
/**
* Create an expression which applies the given operator to the
* given argument.
*/
public Compound (Operator operator, Expression arg) {
assert operator.getNumberOfArguments () == 1;
this.operator = operator;
this.children = new Expression[] { arg } ;
}
/**
* Create an expression which applies the given operator to the
* two given arguments.
*/
public Compound (Operator operator, Expression arg1, Expression arg2) {
assert operator.getNumberOfArguments () == 2;
this.operator = operator;
this.children = new Expression[] { arg1, arg2 } ;
}
}
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