2 package org.z3950.zing.cql;
4 import java.util.Properties;
7 * Represents a boolean node in a CQL parse-tree.
10 public abstract class CQLBooleanNode extends CQLNode {
15 * The root of a parse-tree representing the left-hand side.
17 public CQLNode getLeftOperand() {
21 private CQLNode right;
24 * The root of a parse-tree representing the right-hand side.
26 public CQLNode getRightOperand() {
33 * The set of modifiers that are applied to this boolean.
35 public List<Modifier> getModifiers() {
36 return ms.getModifiers();
39 protected CQLBooleanNode(CQLNode left, CQLNode right, ModifierSet ms) {
46 public void traverse(CQLNodeVisitor visitor) {
47 visitor.onBooleanNode(this);
48 left.traverse(visitor);
49 right.traverse(visitor);
54 void toXCQLInternal(XCQLBuilder b, int level,
55 List<CQLPrefix> prefixes, List<ModifierSet> sortkeys) {
56 b.indent(level).append("<triple>\n");
57 renderPrefixes(b, level + 1, prefixes);
58 ms.toXCQLInternal(b, level + 1, "boolean", "value");
59 b.indent(level + 1).append("<leftOperand>\n");
60 left.toXCQLInternal(b, level + 2);
61 b.indent(level + 1).append("</leftOperand>\n");
62 b.indent(level + 1).append("<rightOperand>\n");
63 right.toXCQLInternal(b, level + 2);
64 b.indent(level + 1).append("</rightOperand>\n");
65 renderSortKeys(b, level + 1, sortkeys);
66 b.indent(level).append("</triple>\n");
70 public String toCQL() {
71 // ### We don't always need parens around the operands
72 return ("(" + left.toCQL() + ")" +
73 " " + ms.toCQL() + " " +
74 "(" + right.toCQL() + ")");
78 public String toPQF(Properties config) throws PQFTranslationException {
79 return ("@" + opPQF() +
80 " " + left.toPQF(config) +
81 " " + right.toPQF(config));
84 // represents the operation for PQF: overridden for CQLProxNode
85 String opPQF() { return ms.getBase(); }
88 public byte[] toType1BER(Properties config) throws PQFTranslationException {
89 System.out.println("in CQLBooleanNode.toType1BER(): PQF=" +
91 byte[] rpn1 = left.toType1BER(config);
92 byte[] rpn2 = right.toType1BER(config);
93 byte[] op = opType1();
94 byte[] rpnStructure = new byte[rpn1.length+rpn2.length+op.length+4];
97 int offset = putTag(CONTEXT, 1, CONSTRUCTED, rpnStructure, 0);
99 rpnStructure[offset++] = (byte)(0x80&0xff); // indefinite length
100 System.arraycopy(rpn1, 0, rpnStructure, offset, rpn1.length);
101 offset += rpn1.length;
102 System.arraycopy(rpn2, 0, rpnStructure, offset, rpn2.length);
103 offset += rpn2.length;
104 System.arraycopy(op, 0, rpnStructure, offset, op.length);
106 rpnStructure[offset++] = 0x00; // end rpnRpnOp
107 rpnStructure[offset++] = 0x00;
111 abstract byte[] opType1();