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21 package org.apache.struts2.components.table.renderer;
22
23 import org.apache.struts2.components.table.WebTable;
24
25
26 /***
27 * this is the base class that most renderers will be derived from.
28 * It allows setting the alignment. Subclasses should set there actuall
29 * content by implementing getCellValue
30 */
31 abstract public class AbstractCellRenderer implements CellRenderer {
32
33 /***
34 * used for horizontal cell alignmnet
35 */
36 protected String _alignment = null;
37
38
39 public void setAlignment(String alignment) {
40 _alignment = alignment;
41 }
42
43 public String getAlignment() {
44 return _alignment;
45 }
46
47 /***
48 * implememnts CellRenderer renderCell. It sets the alignment. gets the actual
49 * data from getCellValue
50 */
51 public String renderCell(WebTable table, Object data, int row, int col) {
52 if (isAligned()) {
53 StringBuffer buf = new StringBuffer(256);
54 buf.append("<div align='").append(_alignment).append("'>");
55 buf.append(getCellValue(table, data, row, col));
56 buf.append("</div>");
57
58 return buf.toString();
59 }
60
61 return getCellValue(table, data, row, col);
62 }
63
64 protected boolean isAligned() {
65 return _alignment != null;
66 }
67
68 /***
69 * this is the method that subclasses need to implement to set their value.
70 * they should not override renderCell unless they want to change the alignmnent
71 * renderering
72 */
73 abstract protected String getCellValue(WebTable table, Object data, int row, int col);
74 }