/* $Id: Expression.java,v 1.6 2005/11/13 16:42:09 blackdrag Exp $ 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. 2. Redistributions in binary form must reproduce the    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"    nor may "groovy" appear in their names without prior written    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 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */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: 1.6 $ */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     * @return     */    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;    }}