1 // $Id: CQLTermNode.java,v 1.11 2002-11-29 16:43:23 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 1.11 2002-11-29 16:43:23 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();
62 // Do this first so that if any other truncation or
63 // completeness attributes are generated, they "overwrite"
64 // those specified here.
66 // ### This approach relies on an unpleasant detail of Index
67 // Data's (admittedly definitive) implementation of PQF,
68 // and should not relied upon.
70 String attr = config.getProperty("always");
74 attr = config.getProperty("qualifier." + qualifier);
76 throw new UnknownQualifierException(qualifier);
79 String rel = relation.getBase();
80 if (rel.equals("=")) {
82 } else if (rel.equals("<=")) {
84 } else if (rel.equals(">=")) {
87 // ### Handling "any" and "all" properly would involve breaking
88 // the string down into a bunch of individual words and ORring
89 // or ANDing them together. Another day.
90 attr = config.getProperty("relation." + rel);
92 throw new UnknownRelationException(rel);
95 String[] mods = relation.getModifiers();
96 for (int i = 0; i < mods.length; i++) {
97 attr = config.getProperty("relationModifier." + mods[i]);
99 throw new UnknownRelationModifierException(mods[i]);
105 //System.err.println("before check: text='" + text + "'");
106 if (text.length() > 0 && text.substring(0, 1).equals("^")) {
107 //System.err.println("first in field");
108 text = text.substring(1);
111 //System.err.println("between checks: text='" + text + "'");
112 int len = text.length();
113 if (len > 0 && text.substring(len-1, len).equals("^")) {
114 //System.err.println("last in field");
115 text = text.substring(0, len-1);
116 pos = pos.equals("first") ? "firstAndLast" : "last";
117 // ### in the firstAndLast case, the standard
118 // pqf.properties file specifies that we generate a
119 // completeness=whole-field attributem, which means that
120 // we don't generate a position attribute at all. Do we
121 // care? Does it matter?
123 //System.err.println("after checks: text='" + text + "'");
124 attr = config.getProperty("position." + pos);
126 throw new UnknownPositionException(pos);
129 attr = config.getProperty("structure." + rel);
131 attr = config.getProperty("structure.*");
135 for (int i = 0; i < attrs.size(); i++) {
136 attr = (String) attrs.get(i);
137 s += "@attr " + Utils.replaceString(attr, " ", " @attr ") + " ";
140 return s + maybeQuote(text);
143 static String maybeQuote(String str) {
144 // There _must_ be a better way to make this test ...
145 if (str.length() == 0 ||
146 str.indexOf('"') != -1 ||
147 str.indexOf(' ') != -1 ||
148 str.indexOf('\t') != -1 ||
149 str.indexOf('=') != -1 ||
150 str.indexOf('<') != -1 ||
151 str.indexOf('>') != -1 ||
152 str.indexOf('/') != -1 ||
153 str.indexOf('(') != -1 ||
154 str.indexOf(')') != -1) {
155 str = '"' + Utils.replaceString(str, "\"", "\\\"") + '"';