1 // $Id: CQLTermNode.java,v 1.10 2002-11-20 15:38:27 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 1.10 2002-11-20 15:38:27 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, Vector prefixes) {
38 return (indent(level) + "<searchClause>\n" +
39 renderPrefixes(level+1, prefixes) +
40 indent(level+1) + "<index>" + xq(qualifier) + "</index>\n" +
41 relation.toXCQL(level+1, new Vector()) +
42 indent(level+1) + "<term>" + xq(term) + "</term>\n" +
43 indent(level) + "</searchClause>\n");
46 public String toCQL() {
47 String quotedQualifier = maybeQuote(qualifier);
48 String quotedTerm = maybeQuote(term);
49 String res = quotedTerm;
51 if (!qualifier.equalsIgnoreCase("srw.serverChoice")) {
52 // ### We don't always need spaces around `relation'.
53 res = quotedQualifier + " " + relation.toCQL() + " " + quotedTerm;
59 public String toPQF(Properties config) throws PQFTranslationException {
60 Vector attrs = new Vector();
63 attr = config.getProperty("qualifier." + qualifier);
65 throw new UnknownQualifierException(qualifier);
68 String rel = relation.getBase();
69 if (rel.equals("=")) {
71 } else if (rel.equals("<=")) {
73 } else if (rel.equals(">=")) {
76 // ### Handling "any" and "all" properly would involve breaking
77 // the string down into a bunch of individual words and ORring
78 // or ANDing them together. Another day.
79 attr = config.getProperty("relation." + rel);
81 throw new UnknownRelationException(rel);
84 String[] mods = relation.getModifiers();
85 for (int i = 0; i < mods.length; i++) {
86 attr = config.getProperty("relationModifier." + mods[i]);
88 throw new UnknownRelationModifierException(mods[i]);
92 String pos = "unanchored";
94 if (text.length() > 0 && text.substring(0, 1).equals("^")) {
95 text = text.substring(1);
98 attr = config.getProperty("position." + pos);
100 throw new UnknownPositionException(pos);
103 attr = config.getProperty("structure." + rel);
105 attr = config.getProperty("structure.*");
108 attr = config.getProperty("always");
113 for (int i = 0; i < attrs.size(); i++) {
114 attr = (String) attrs.get(i);
115 s += "@attr " + Utils.replaceString(attr, " ", " @attr ") + " ";
118 return s + maybeQuote(text);
121 static String maybeQuote(String str) {
122 // There _must_ be a better way to make this test ...
123 if (str.length() == 0 ||
124 str.indexOf('"') != -1 ||
125 str.indexOf(' ') != -1 ||
126 str.indexOf('\t') != -1 ||
127 str.indexOf('=') != -1 ||
128 str.indexOf('<') != -1 ||
129 str.indexOf('>') != -1 ||
130 str.indexOf('/') != -1 ||
131 str.indexOf('(') != -1 ||
132 str.indexOf(')') != -1) {
133 str = '"' + Utils.replaceString(str, "\"", "\\\"") + '"';