-// $Id: CQLBooleanNode.java,v 1.2 2002-10-25 16:11:05 mike Exp $
+// $Id: CQLBooleanNode.java,v 1.3 2002-10-25 16:56:43 mike Exp $
package org.z3950.zing.cql;
* Represents a boolean node in a CQL parse-tree ...
* ###
*
- * @version $Id: CQLBooleanNode.java,v 1.2 2002-10-25 16:11:05 mike Exp $
+ * @version $Id: CQLBooleanNode.java,v 1.3 2002-10-25 16:56:43 mike Exp $
*/
public abstract class CQLBooleanNode extends CQLNode {
protected CQLNode left;
protected CQLNode right;
+
+ abstract String op();
+
+ String toXCQL(int level) {
+ return(indent(level) + "<triple>\n" +
+ indent(level+1) + "<boolean>" + op() + "</boolean>\n" +
+ left.toXCQL(level+1) +
+ right.toXCQL(level+1) +
+ indent(level) + "</triple>\n");
+ }
+
+ String toCQL() {
+ return "(" + left.toCQL() + ") " + op() + " (" + right.toCQL() + ")";
+ }
}