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Java > Open Source Codes > org > apache > turbine > util > parser > TSVParser


1 package org.apache.turbine.util.parser;
2
3 /*
4  * Copyright 2001-2004 The Apache Software Foundation.
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License")
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18
19 import java.io.Reader JavaDoc;
20 import java.io.StreamTokenizer JavaDoc;
21 import java.util.List JavaDoc;
22
23 /**
24  * TSVParser is used to parse a stream with tab-separated values and
25  * generate ParameterParser objects which can be used to
26  * extract the values in the desired type.
27  *
28  * <p>The class extends the abstract class DataStreamParser and implements
29  * initTokenizer with suitable values for TSV files to provide this
30  * functionality.
31  *
32  * <p>The class (indirectly through DataStreamParser) implements the
33  * java.util.Iterator interface for convenience.
34  * This allows simple use in a Velocity template for example:
35  *
36  * <pre>
37  * #foreach ($row in $tsvfile)
38  * Name: $row.Name
39  * Description: $row.Description
40  * #end
41  * </pre>
42  *
43  * @author <a HREF="mailto:sean@informage.net">Sean Legassick</a>
44  * @author <a HREF="mailto:martin@mvdb.net">Martin van den Bemt</a>
45  * @version $Id: TSVParser.java,v 1.1.2.2 2004/05/20 03:33:43 seade Exp $
46  */
47 public class TSVParser extends DataStreamParser
48 {
49     /**
50      * Create a new TSVParser instance. Requires a Reader to read the
51      * tab-separated values from. The column headers must be set
52      * independently either explicitly, or by reading the first line
53      * of the TSV values.
54      *
55      * @param in the input reader.
56      */
57     public TSVParser(Reader JavaDoc in)
58     {
59         super(in, null, null);
60     }
61
62     /**
63      * Create a new TSVParser instance. Requires a Reader to read the
64      * tab-separated values from, and a list of column names.
65      *
66      * @param in the input reader.
67      * @param columnNames a list of column names.
68      */
69     public TSVParser(Reader JavaDoc in, List JavaDoc columnNames)
70     {
71         super(in, columnNames, null);
72     }
73
74     /**
75      * Create a new TSVParser instance. Requires a Reader to read the
76      * tab-separated values from, a list of column names and a
77      * character encoding.
78      *
79      * @param in the input reader.
80      * @param columnNames a list of column names.
81      * @param characterEncoding the character encoding of the input.
82      */
83     public TSVParser(Reader JavaDoc in, List JavaDoc columnNames, String JavaDoc characterEncoding)
84     {
85         super(in, columnNames, characterEncoding);
86     }
87
88     /**
89      * Initialize the StreamTokenizer instance used to read the lines
90      * from the input reader.
91      * It is now only needed to set the fieldSeparator
92      */
93     protected void initTokenizer(StreamTokenizer JavaDoc tokenizer)
94     {
95         super.initTokenizer(tokenizer);
96         // set the field separator to tabs.
97 super.setFieldSeparator('\t');
98     }
99 }
100
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