HasPart


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.RepositoryException;
23  import org.outerj.daisy.repository.Version;
24  import org.outerj.daisy.repository.schema.PartType;
25  
26  import java.sql.PreparedStatement  ;
27  import java.sql.SQLException  ;
28  
29  public class HasPart extends AbstractPredicateExpr {
30      private final String   partTypeName;
31      private PartType partType;
32  
33      public HasPart(String   partTypeName) {
34          this.partTypeName = partTypeName;
35      }
36  
37      public void prepare(QueryContext context) throws QueryException {
38          try {
39              this.partType = context.getPartTypeByName(partTypeName);
40          } catch (RepositoryException e) {
41              throw new QueryException("Error retrieving PartType named \"" + partTypeName + "\".", e);
42          }
43      }
44  
45      public boolean evaluate(Document document, Version version, EvaluationContext evaluationContext) throws QueryException {
46          if (version != null)
47              return version.hasPart(partType.getId());
48          else
49              return document.hasPart(partType.getId());
50      }
51  
52      public void generateSql(StringBuffer   sql, SqlGenerationContext context) throws QueryException {
53          String   alias = context.getNewPartsTableAlias();
54  
55          sql.append(alias);
56          sql.append('.');
57          sql.append(SqlGenerationContext.PartsTable.PARTTYPE_ID);
58          sql.append(" = ? ");
59      }
60  
61      public int bindSql(PreparedStatement   stmt, int bindPos, EvaluationContext evaluationContext) throws SQLException   {
62          stmt.setLong(bindPos, partType.getId());
63          bindPos++;
64          return bindPos;
65      }
66  
67      public AclConditionViolation isAclAllowed() {
68          return new AclConditionViolation("HasPart is not allowed in ACL conditions");
69      }
70  
71      public Tristate appliesTo(Document document) {
72          throw new IllegalStateException  ();
73      }
74  }
75
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