1 // $Id: CQLBooleanNode.java,v 1.6 2002-10-31 22:22:01 mike Exp $
3 package org.z3950.zing.cql;
7 * Represents a boolean node in a CQL parse-tree.
10 * @version $Id: CQLBooleanNode.java,v 1.6 2002-10-31 22:22:01 mike Exp $
12 public abstract class CQLBooleanNode extends CQLNode {
13 protected CQLNode left;
14 protected CQLNode right;
18 String toXCQL(int level) {
19 return (indent(level) + "<triple>\n" +
21 left.toXCQL(level+1) +
22 right.toXCQL(level+1) +
23 indent(level) + "</triple>\n");
26 String booleanXQL(int level) {
27 return(indent(level) + "<boolean>\n" +
28 indent(level+1) + "<value>" + op() + "</value>\n" +
29 indent(level) + "</boolean>\n");
33 // ### We don't always need parens around the operands
34 return "(" + left.toCQL() + ") " + op() + " (" + right.toCQL() + ")";