BindingUtils


1   // Copyright 2005 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.tapestry.binding;
16  
17  import org.apache.hivemind.HiveMind;
18  import org.apache.tapestry.spec.IComponentSpecification;
19  import org.apache.tapestry.spec.IParameterSpecification;
20  
21  /**
22   * @author Howard M. Lewis Ship
23   * @since 4.0
24   */
25  public class BindingUtils
26  {
27      /**
28       * Determines the correct default parameter type (to pass to
29       * {@link org.apache.tapestry.binding.BindingSource#createBinding(IComponent, String, String, String, Location)}
30       * for a component specification and parameter name.
31       * 
32       * @param specification
33       *            the specification of the component for which a binding is being created
34       * @param parameterName
35       *            the name of the parameter to bind which may be either the name of a formal or
36       *            informal parameter
37       * @returns the default binding type defined by the matching {@link IParameterSpecification},
38       *          or {@link BindingConstants.LITERAL_PREFIX} for informal parameters.
39       */
40      public static String   getDefaultBindingType(IComponentSpecification specification,
41              String   parameterName, String   metaDefaultBindingType)
42      {
43          String   result = null;
44  
45          IParameterSpecification ps = specification.getParameter(parameterName);
46  
47          if (ps != null)
48              result = ps.getDefaultBindingType();
49  
50          if (HiveMind.isBlank(result))
51              result = metaDefaultBindingType;
52  
53          return result;
54      }
55  }
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags