-// $Id: CQLBooleanNode.java,v 1.6 2002-10-31 22:22:01 mike Exp $
+// $Id: CQLBooleanNode.java,v 1.7 2002-11-06 00:05:58 mike Exp $
package org.z3950.zing.cql;
/**
* Represents a boolean node in a CQL parse-tree.
- * ##
*
- * @version $Id: CQLBooleanNode.java,v 1.6 2002-10-31 22:22:01 mike Exp $
+ * @version $Id: CQLBooleanNode.java,v 1.7 2002-11-06 00:05:58 mike Exp $
*/
public abstract class CQLBooleanNode extends CQLNode {
- protected CQLNode left;
- protected CQLNode right;
+ CQLBooleanNode() {} // prevent javadoc from documenting this
+
+ /**
+ * The root of a parse-tree representing the left-hand side.
+ */
+ public CQLNode left;
+
+ /**
+ * The root of a parse-tree representing the right-hand side.
+ */
+ public CQLNode right;
abstract String op();
- String toXCQL(int level) {
+ public String toXCQL(int level) {
return (indent(level) + "<triple>\n" +
booleanXQL(level+1) +
left.toXCQL(level+1) +
indent(level) + "</triple>\n");
}
+ // Represents the boolean operation itself: overridden for CQLProxNode
String booleanXQL(int level) {
return(indent(level) + "<boolean>\n" +
indent(level+1) + "<value>" + op() + "</value>\n" +
indent(level) + "</boolean>\n");
}
- String toCQL() {
+ public String toCQL() {
// ### We don't always need parens around the operands
return "(" + left.toCQL() + ") " + op() + " (" + right.toCQL() + ")";
}