-// $Id: CQLBooleanNode.java,v 1.3 2002-10-25 16:56:43 mike Exp $
+// $Id: CQLBooleanNode.java,v 1.11 2002-11-20 17:56:22 mike Exp $
package org.z3950.zing.cql;
+import java.util.Properties;
+import java.util.Vector;
/**
- * Represents a boolean node in a CQL parse-tree ...
- * ###
+ * Represents a boolean node in a CQL parse-tree.
*
- * @version $Id: CQLBooleanNode.java,v 1.3 2002-10-25 16:56:43 mike Exp $
+ * @version $Id: CQLBooleanNode.java,v 1.11 2002-11-20 17:56:22 mike Exp $
*/
public abstract class CQLBooleanNode extends CQLNode {
- protected CQLNode left;
- protected CQLNode right;
+ CQLBooleanNode() {} // prevent javadoc from documenting this
- abstract String op();
+ /**
+ * 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;
- 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");
+ public String toXCQL(int level, Vector prefixes) {
+ return (indent(level) + "<triple>\n" +
+ renderPrefixes(level+1, prefixes) +
+ opXCQL(level+1) +
+ indent(level+1) + "<leftOperand>\n" +
+ left.toXCQL(level+2, new Vector()) +
+ indent(level+1) + "</leftOperand>\n" +
+ indent(level+1) + "<rightOperand>\n" +
+ right.toXCQL(level+2, new Vector()) +
+ indent(level+1) + "</rightOperand>\n" +
+ indent(level) + "</triple>\n");
}
- String toCQL() {
+ // Represents the boolean operation itself: overridden for CQLProxNode
+ String opXCQL(int level) {
+ return(indent(level) + "<boolean>\n" +
+ indent(level+1) + "<value>" + op() + "</value>\n" +
+ indent(level) + "</boolean>\n");
+ }
+
+ public String toCQL() {
+ // ### We don't always need parens around the operands
return "(" + left.toCQL() + ") " + op() + " (" + right.toCQL() + ")";
}
+
+ public String toPQF(Properties config) throws PQFTranslationException {
+ return ("@" + opPQF() +
+ " " + left.toPQF(config) +
+ " " + right.toPQF(config));
+ }
+
+ // represents the operation for PQF: overridden for CQLProxNode
+ String opPQF() { return op(); }
+
+ abstract String op();
}