AttributeConverter


1   /*
2    * Copyright 2006 Google Inc.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5    * use this file except in compliance with the License. You may obtain a copy of
6    * 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, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations under
14   * the License.
15   */
16  package com.google.gwt.dev.util.xml;
17  
18  import com.google.gwt.core.ext.UnableToCompleteException;
19  
20  /**
21   * Converts from a string to the type needed.
22   */
23  public abstract class AttributeConverter {
24    /**
25     * Converts from a string to the type needed.
26     * Does not throw conversion-related exceptions.
27     * @param value
28     *    the value to convert
29     * @param schema
30     *    used to report conversion problems
31     * @return
32     *    the argument converted to a form that is expected to compatible with
33     *    the associated parameter and will work for a reflection "invoke()" call;
34     *    <code>null</code> if the conversion failed.
35     */
36    public abstract Object   convertToArg(Schema schema, int line,
37        String   elem, String   attr, String   value) throws UnableToCompleteException;
38  }
39

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