tupleexpression.java

来自「Groovy动态语言 运行在JVM中的动态语言 可以方便的处理业务逻辑变化大的业」· Java 代码 · 共 121 行

/*
 $Id: TupleExpression.java 4098 2006-10-10 16:09:48Z blackdrag $

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

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 ("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
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    products derived from this Software without prior written
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    http://groovy.codehaus.org/

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package org.codehaus.groovy.ast.expr;

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

import org.codehaus.groovy.ast.GroovyCodeVisitor;

/**
 * Represents a tuple expression {1, 2, 3} which creates an immutable List
 * 
 * @author <a href="mailto:[e-mail]">James Strachan</a>
 * @version $Revision: 4098 $
 */
public class TupleExpression extends Expression {
    private List expressions;

    public TupleExpression() {
        this(new ArrayList());
    }
    
    public TupleExpression(List expressions) {
        this.expressions = expressions;
    }
    
    public TupleExpression(Expression[] expressionArray) {
        this();
        expressions.addAll(Arrays.asList(expressionArray));
    }

    public TupleExpression addExpression(Expression expression) {
        expressions.add(expression);
        return this;
    }
    
    public List getExpressions() {
        return expressions;
    }

    public void visit(GroovyCodeVisitor visitor) {
        visitor.visitTupleExpression(this);
    }

    public Expression transformExpression(ExpressionTransformer transformer) {
        Expression ret = new TupleExpression(transformExpressions(getExpressions(), transformer)); 
        ret.setSourcePosition(this);
        return ret;
    }

    public Expression getExpression(int i) {
        return (Expression) expressions.get(i);
    }

    public String getText() {
        StringBuffer buffer = new StringBuffer("(");
        boolean first = true;
        for (Iterator iter = expressions.iterator(); iter.hasNext(); ) {
            if (first) {
                first = false;
            }
            else {
                buffer.append(", ");
            }
            
            buffer.append(((Expression)iter.next()).getText());
        }
        buffer.append(")");
        return buffer.toString();
    }

    public String toString() {
        return super.toString() + expressions;
    }
}