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Java > Open Source Codes > org > outerj > daisy > query > model > IsLinked


1 /*
2  * Copyright 2004 Outerthought bvba and Schaubroeck nv
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.outerj.daisy.query.model;
17
18 import org.outerj.daisy.query.QueryContext;
19 import org.outerj.daisy.repository.query.QueryException;
20 import org.outerj.daisy.repository.query.EvaluationContext;
21 import org.outerj.daisy.repository.Document;
22 import org.outerj.daisy.repository.Version;
23
24 import java.sql.PreparedStatement JavaDoc;
25 import java.sql.SQLException JavaDoc;
26
27 public class IsLinked extends AbstractPredicateExpr {
28     private final boolean linked;
29
30     public IsLinked(boolean linked) {
31         this.linked = linked;
32     }
33
34     public void prepare(QueryContext context) throws QueryException {
35         // nothing to do
36 }
37
38     public boolean evaluate(Document document, Version version, EvaluationContext evaluationContext) throws QueryException {
39         throw new RuntimeException JavaDoc("IsLinked/IsNotLinked cannot be dynamically evaluated.");
40     }
41
42     public void generateSql(StringBuffer JavaDoc sql, SqlGenerationContext context) throws QueryException {
43         context.needsJoinWithTable(SqlGenerationContext.EXTRACTED_LINKS_TABLE_INVERSE);
44         sql.append(" (");
45         sql.append(SqlGenerationContext.EXTRACTED_LINKS_TABLE.getName());
46         sql.append(".");
47         sql.append(SqlGenerationContext.ExtractedLinksTable.TARGET_DOC_ID);
48
49         if (linked) {
50             sql.append(" is not null ");
51         } else {
52             sql.append(" is null ");
53         }
54
55         sql.append(") ");
56     }
57
58     public int bindSql(PreparedStatement JavaDoc stmt, int bindPos, EvaluationContext evaluationContext) throws SQLException JavaDoc {
59         return bindPos;
60     }
61
62     public AclConditionViolation isAclAllowed() {
63         return new AclConditionViolation("IsLinked/IsNotLinked is not allowed in ACL conditions");
64     }
65
66     public Tristate appliesTo(Document document) {
67         throw new IllegalStateException JavaDoc();
68     }
69 }
70
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