groovy-core/src/main/org/codehaus/groovy/ast/expr/Expression.java

/*
 $Id$

 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.

 Redistribution and use of this software and associated documentation
 ("Software"), with or without modification, are permitted provided
 that the following conditions are met:

 1. Redistributions of source code must retain copyright
    statements and notices.  Redistributions must also contain a
    copy of this document.

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    above copyright notice, this list of conditions and the
    following disclaimer in the documentation and/or other
    materials provided with the distribution.

 3. The name "groovy" must not be used to endorse or promote
    products derived from this Software without prior written
    permission of The Codehaus.  For written permission,
    please contact info@codehaus.org.

 4. Products derived from this Software may not be called "groovy"
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    permission of The Codehaus. "groovy" is a registered
    trademark of The Codehaus.

 5. Due credit should be given to The Codehaus -
    http://groovy.codehaus.org/

 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
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package org.codehaus.groovy.ast.expr;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.codehaus.groovy.ast.ASTNode;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;

/**
 * Represents a base class for expressions which evaluate as an object
 * 
 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
 * @version $Revision$
 */
public abstract class Expression extends ASTNode {

    private ClassNode type=ClassHelper.DYNAMIC_TYPE;
    
    /**
     * Return a copy of the expression calling the transformer on any nested expressions 
     * @param transformer
     */
    public abstract Expression transformExpression(ExpressionTransformer transformer);

    /**
     * Transforms the list of expressions
     * @return a new list of transformed expressions
     */
    protected List transformExpressions(List expressions, ExpressionTransformer transformer) {
        List list = new ArrayList(expressions.size());
        for (Iterator iter = expressions.iterator(); iter.hasNext(); ) {
            list.add(transformer.transform((Expression) iter.next()));
        }
        return list;
    }
    
    public ClassNode getType() {
        return type;
    }
    
    public void setType(ClassNode t) {
        type=t;
    }
}