1 // $Id: CQLPrefixNode.java,v 1.10 2007-07-03 16:40:11 mike Exp $
3 package org.z3950.zing.cql;
4 import java.lang.String;
5 import java.util.Properties;
6 import java.util.Vector;
10 * Represents a prefix node in a CQL parse-tree.
12 * @version $Id: CQLPrefixNode.java,v 1.10 2007-07-03 16:40:11 mike Exp $
14 public class CQLPrefixNode extends CQLNode {
16 * The prefix definition that governs the subtree.
18 public CQLPrefix prefix;
21 * The root of a parse-tree representing the part of the query
22 * that is governed by this prefix definition.
24 public CQLNode subtree;
27 * Creates a new CQLPrefixNode inducing a mapping from the
28 * specified index-set name to the specified identifier across
29 * the specified subtree.
31 public CQLPrefixNode(String name, String identifier, CQLNode subtree) {
32 this.prefix = new CQLPrefix(name, identifier);
33 this.subtree = subtree;
36 public String toXCQL(int level, Vector<CQLPrefix> prefixes,
37 Vector<ModifierSet> sortkeys) {
38 Vector<CQLPrefix> tmp = (prefixes == null ?
39 new Vector<CQLPrefix>() :
40 new Vector<CQLPrefix>(prefixes));
42 return subtree.toXCQL(level, tmp, sortkeys);
45 public String toCQL() {
46 // ### We don't always need parens around the subtree
47 if (prefix.name == null) {
48 return ">\"" + prefix.identifier + "\" " +
49 "(" + subtree.toCQL() + ")";
51 return ">" + prefix.name + "=\"" + prefix.identifier + "\" " +
52 "(" + subtree.toCQL() + ")";
56 public String toPQF(Properties config) throws PQFTranslationException {
57 // Prefixes and their identifiers don't actually play any role
58 // in PQF translation, since the meanings of the indexes,
59 // including their prefixes if any, are instead wired into
61 return subtree.toPQF(config);
64 public byte[] toType1BER(Properties config) throws PQFTranslationException {
65 // See comment on toPQF()
66 return subtree.toType1BER(config);