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1   /**
2    * Copyright 2007 Björn Voß
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 net.sf.oxclient.communication.json;
17  
18  import java.util.ArrayList;
19  import java.util.HashMap;
20  import java.util.List;
21  import java.util.Map;
22  import java.util.StringTokenizer;
23  import java.util.Map.Entry;
24  
25  import net.sf.oval.constraint.NotNull;
26  import net.sf.oval.guard.Guarded;
27  
28  /**
29   * @author Björn Voß
30   *
31   */
32  @Guarded
33  public class SimpleParameterGenerator implements IParameterGenerator {
34  
35  	private static final String COLUMNS_PARAMETERNAME = "columns";
36  
37  	/* (non-Javadoc)
38  	 * @see net.sf.oxclient.communication.json.IParameterGenerator#generateColumnList(java.util.Map, java.util.Map)
39  	 */
40  	public List<String> generateColumnList(final Map<String, String> generatedParams,
41  			final Map<Integer, String> columns) {
42  		final List<String> result = new ArrayList<String>();
43  		final StringTokenizer st = new StringTokenizer(generatedParams.get(SimpleParameterGenerator.COLUMNS_PARAMETERNAME), ",");
44  		while (st.hasMoreElements()) {
45  			final String token = st.nextToken();
46  			final String column = columns.get(Integer.valueOf(token));
47  			result.add(column);
48  		}
49  		return result;
50  	}
51  
52  	/* (non-Javadoc)
53  	 * @see net.sf.oxclient.communication.json.IParameterGenerator#generateParameter(java.util.Map, java.util.Map)
54  	 */
55  	public Map<String, String> generateParameter(
56  			@NotNull final Map<String, String> origParams,
57  			final Map<Integer, String> columns) {
58  		final Map<String, String> resMap = new HashMap<String, String>();
59  		for (final Entry<String, String> entry : origParams.entrySet()) {
60  			resMap.put(entry.getKey(), entry.getValue());
61  		}
62  		final String columnsValu = generateColumnsValue(columns);
63  		resMap.put(SimpleParameterGenerator.COLUMNS_PARAMETERNAME, columnsValu);
64  		return resMap;
65  	}
66  
67  	/**
68  	 * @param columns
69  	 * @return
70  	 */
71  	private String generateColumnsValue(final Map<Integer, String> columns) {
72  		final StringBuffer sb = new StringBuffer();
73  		for (final Integer key : columns.keySet()) {
74  			sb.append(key);
75  			sb.append(",");
76  		}
77  		sb.deleteCharAt(sb.length() -1);
78  		return sb.toString();
79  	}
80  
81  }