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Collection.java

package edu.ksu.cis.bandera.bir;

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Bandera, a Java(TM) analysis and transformation toolkit           *
 * Copyright (C) 1998, 1999   James Corbett (corbett@hawaii.edu)     *
 * All rights reserved.                                              *
 *                                                                   *
 * This work was done as a project in the SAnToS Laboratory,         *
 * Department of Computing and Information Sciences, Kansas State    *
 * University, USA (http://www.cis.ksu.edu/santos).                  *
 * It is understood that any modification not identified as such is  *
 * not covered by the preceding statement.                           *
 *                                                                   *
 * This work is free software; you can redistribute it and/or        *
 * modify it under the terms of the GNU Library General Public       *
 * License as published by the Free Software Foundation; either      *
 * version 2 of the License, or (at your option) any later version.  *
 *                                                                   *
 * This work 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 *
 * Library General Public License for more details.                  *
 *                                                                   *
 * You should have received a copy of the GNU Library General Public *
 * License along with this toolkit; if not, write to the             *
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,      *
 * Boston, MA  02111-1307, USA.                                      *
 *                                                                   *
 * Java is a trademark of Sun Microsystems, Inc.                     *
 *                                                                   *
 * To submit a bug report, send a comment, or get the latest news on *
 * this project and other SAnToS projects, please visit the web-site *
 *                http://www.cis.ksu.edu/santos                      *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
import ca.mcgill.sable.util.*;

import java.io.*;
import java.util.*;

/**
 * An collection type.
 * <p>
 * A collection represents a bounded heap that can contain up to
 * a fixed number of entities of a given type (the base type).
 * <p>
 * Collections are top-level types---a state variable can be
 * a collection, but not an array slot or record field (nor
 * can collections be nested).
 */

public class Collection extends Type implements BirConstants {

    Type baseType;
    ConstExpr size;

    public Collection(Type baseType, ConstExpr size) {
    this.baseType = baseType;
    this.size = size;
    this.extent = 0;
    }
    public void apply(TypeSwitch sw, Object o)
    {
        sw.caseCollection(this, o);
    }
    public Expr defaultVal() { return null; }
    public Type getBaseType() { return baseType; }
    public int getExtent() { 
    if (extent == 0)
        extent = baseType.getExtent() * size.getValue();
    return extent;
    }
    public ConstExpr getSize() { return size; }
    public boolean isKind(int kind) { 
    return (kind & COLLECTION) != 0;
    }
    // Printing
    public String toString() {
    return "collection [" 
        + size + "] of " + baseType.typeSpec();
    }
}

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