1 // $Id: CQLTermNode.java,v 1.7 2002-11-06 00:05:58 mike Exp $
3 package org.z3950.zing.cql;
4 import java.util.Properties;
5 import java.util.Vector;
9 * Represents a terminal node in a CQL parse-tree.
10 * A term node consists of the term String itself, together with,
11 * optionally, a qualifier string and a relation. Neither or both of
12 * these must be provided - you can't have a qualifier without a
13 * relation or vice versa.
15 * @version $Id: CQLTermNode.java,v 1.7 2002-11-06 00:05:58 mike Exp $
17 public class CQLTermNode extends CQLNode {
18 private String qualifier;
19 private CQLRelation relation;
23 * Creates a new term node with the specified <TT>qualifier</TT>,
24 * <TT>relation</TT> and <TT>term</TT>. The first two may be
25 * <TT>null</TT>, but the <TT>term</TT> may not.
27 public CQLTermNode(String qualifier, CQLRelation relation, String term) {
28 this.qualifier = qualifier;
29 this.relation = relation;
33 public String getQualifier() { return qualifier; }
34 public CQLRelation getRelation() { return relation; }
35 public String getTerm() { return term; }
37 public String toXCQL(int level) {
38 return (indent(level) + "<searchClause>\n" +
39 indent(level+1) + "<index>" + xq(qualifier) + "</index>\n" +
40 relation.toXCQL(level+1) +
41 indent(level+1) + "<term>" + xq(term) + "</term>\n" +
42 indent(level) + "</searchClause>\n");
45 public String toCQL() {
46 String quotedQualifier = maybeQuote(qualifier);
47 String quotedTerm = maybeQuote(term);
48 String res = quotedTerm;
50 if (!qualifier.equalsIgnoreCase("srw.serverChoice")) {
51 // ### We don't always need spaces around `relation'.
52 res = quotedQualifier + " " + relation.toCQL() + " " + quotedTerm;
58 public String toPQF(Properties config)
59 throws UnknownQualifierException, UnknownRelationException {
60 Vector attrs = new Vector();
62 if (qualifier != null) {
63 String s = config.getProperty(qualifier);
65 throw new UnknownQualifierException(qualifier);
68 // ### get a default access point from properties?
71 if (relation != null) {
72 String rel = relation.getBase();
73 // ### handle "any" and "all"
74 String s = config.getProperty("cql-java.relation." + rel);
76 throw new UnknownRelationException(rel);
79 // ### get a default relation from properties?
82 // ### handle position attributes
83 // ### handle structure attributes
84 // ### handle "always" attributes
86 // ### should split Vector elements on spaces
88 for (int i = 0; i < attrs.size(); i++) {
89 s += "@attr " + (String) attrs.get(i) + " ";
92 return s + maybeQuote(term);
95 static String maybeQuote(String str) {
96 // There _must_ be a better way to make this test ...
97 if (str.length() == 0 ||
98 str.indexOf('"') != -1 ||
99 str.indexOf(' ') != -1 ||
100 str.indexOf('\t') != -1 ||
101 str.indexOf('=') != -1 ||
102 str.indexOf('<') != -1 ||
103 str.indexOf('>') != -1 ||
104 str.indexOf('/') != -1 ||
105 str.indexOf('(') != -1 ||
106 str.indexOf(')') != -1) {
107 str = '"' + Utils.replaceString(str, "\"", "\\\"") + '"';