selectorast.java

来自「OpenJMS是一个开源的Java Message Service API 1.」· Java 代码 · 共 123 行

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package org.exolab.jms.selector.parser;

import antlr.CommonAST;
import antlr.CommonToken;
import antlr.Token;
import org.exolab.jms.selector.Context;
import org.exolab.jms.selector.Type;


/**
 * Selector AST node. This adds expression type and context information used
 * by the tree parser to validate expressions.
 *
 * @version     $Revision: 1.1 $ $Date: 2004/11/26 01:50:45 $
 * @author      <a href="mailto:[e-mail]">Tim Anderson</a>
 * @see         Context
 * @see         SelectorParser
 * @see         SelectorTreeParser
 * @see         Type
 */
public class SelectorAST extends CommonAST {

    /**
     * The return type
     */
    private Type _type;

    /**
     * The context of the node
     */
    private Context _context;


    /**
     * Construct a new <code>SelectorAST</code>
     */
    public SelectorAST() {
        _type = Type.UNDEFINED;
    }

    /**
     * Initialise this with a token
     *
     * @param token the token
     */
    public void initialize(final Token token) {
        super.initialize(token);
        _context = new Context(((CommonToken) token).getLine(),
            ((CommonToken) token).getColumn());
    }

    /**
     * Sets the return type of the expression
     *
     * @param type the return type
     */
    public void setReturnType(final Type type) {
        _type = type;
    }

    /**
     * Returns the return type of the expression
     *
     * @return the return type of the expression
     */
    public Type getReturnType() {
        return _type;
    }

    /**
     * Returns the context of the expression
     *
     * @return the context of the expression
     */
    public Context getContext() {
        return _context;
    }

} //-- SelectorAST