ResolveDefinition


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.publisher.serverimpl.resolving;
17  
18  import org.outerj.daisy.repository.query.PredicateExpression;
19  import org.outerj.daisy.repository.query.QueryException;
20  import org.outerj.daisy.repository.Document;
21  import org.outerj.daisy.repository.Version;
22  import org.outerj.daisy.publisher.PublisherException;
23  
24  import java.util.List  ;
25  import java.util.ArrayList  ;
26  import java.util.Iterator  ;
27  
28  public class ResolveDefinition {
29      private List   resolveRules = new ArrayList  ();
30  
31      protected void addRule(String   expressionString, PredicateExpression expression, String   publisherRequestName) {
32          resolveRules.add(new ResolveRule(expressionString, expression, publisherRequestName));
33      }
34  
35      public String   resolve(Document document, Version version) throws PublisherException {
36          Iterator   resolveRulesIt = resolveRules.iterator();
37          while (resolveRulesIt.hasNext()) {
38              ResolveRule rule = (ResolveRule)resolveRulesIt.next();
39              try {
40                  if (rule.expression.evaluate(document, version))
41                      return rule.publisherRequestName;
42              } catch (QueryException e) {
43                  throw new PublisherException("Error evaluating expression in publisher request mapping: " + rule.expressionString, e);
44              }
45          }
46          return null;
47      }
48  
49      static class ResolveRule {
50          String   expressionString;
51          PredicateExpression expression;
52          String   publisherRequestName;
53  
54          public ResolveRule(String   expressionString, PredicateExpression expression, String   publisherRequestName) {
55              this.expressionString = expressionString;
56              this.expression = expression;
57              this.publisherRequestName = publisherRequestName;
58          }
59      }
60  }
61
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