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1
13 package com.tonbeller.wcf.sqltable;
14
15 import java.io.IOException  ;
16
17 import javax.servlet.http.HttpServletRequest ;
18 import javax.servlet.jsp.JspException ;
19 import javax.servlet.jsp.JspWriter ;
20 import javax.servlet.jsp.jstl.sql.Result;
21
22 import org.apache.log4j.Logger;
23
24 import com.tonbeller.tbutils.res.Resources;
25 import com.tonbeller.wcf.controller.RequestContext;
26 import com.tonbeller.wcf.controller.RequestListener;
27 import com.tonbeller.wcf.expr.ExprUtils;
28 import com.tonbeller.wcf.scroller.Scroller;
29
30
34 public class SqlTablePageNavigationsTag extends SqlTableNestedTag {
35 String resultExpr;
36 private static Logger logger = Logger.getLogger(SqlTablePageNavigationsTag.class);
37
38 static abstract class PageButton implements RequestListener {
39 protected SqlTable table;
40
41 protected abstract int getStartRow(RequestContext context);
42
43 PageButton(SqlTable table) {
44 this.table = table;
45 }
46
47 public void request(RequestContext context) throws Exception {
48 Scroller.enableScroller(context);
49 int maxRows = table.getMaxRows();
50 if (maxRows < 0) {
51 table.setStartRow(0);
53 return;
54 }
55 int startRow = getStartRow(context);
56 if (startRow < 0)
57 startRow = 0;
58 table.setStartRow(startRow);
59 }
60 }
61
62 static class PrevButton extends PageButton {
63 public PrevButton(SqlTable table) {
64 super(table);
65 }
66
67 protected int getStartRow(RequestContext context) {
68 return table.getStartRow() - table.getMaxRows();
69 }
70 }
71
72 static class NextButton extends PageButton {
73 public NextButton(SqlTable table) {
74 super(table);
75 }
76
77 protected int getStartRow(RequestContext context) {
78 return table.getStartRow() + table.getMaxRows();
79 }
80 }
81
82 static class GotoButton extends PageButton {
83 public GotoButton(SqlTable table) {
84 super(table);
85 }
86
87 protected int getStartRow(RequestContext context) {
88 String value = context.getParameter(table.getId() + ".goto.value");
89 if (value == null)
90 return 0;
91 int page;
92 try {
93 page = Integer.parseInt(value);
94 } catch (NumberFormatException e) {
95 return 0;
96 }
97 return (page - 1) * table.getMaxRows();
98 }
99 }
100
101 static class PageSizeButton implements RequestListener {
102 private SqlTable table;
103
104 PageSizeButton(SqlTable table) {
105 this.table = table;
106 }
107
108 public void request(RequestContext context) throws Exception {
109 Scroller.enableScroller(context);
110 String value = context.getParameter(table.getId() + ".size.value");
111 if (value == null)
112 return;
113 int size;
114 try {
115 size = Integer.parseInt(value);
116 } catch (NumberFormatException e) {
117 return;
118 }
119 if (size > 0) {
120 table.setMaxRows(size);
121 table.setStartRow(0);
122 }
123 }
124
125 }
126
127 public int doStartTag() throws JspException {
128 if (!isRenderActions())
129 return SKIP_BODY;
130
131 SqlTable table = getTable();
132 int startRow = table.getStartRow();
133 int maxRows = table.getMaxRows();
134 if (maxRows <= 0)
135 return SKIP_BODY;
136
137 Resources res = getResources();
138 String contextPath = ((HttpServletRequest ) pageContext.getRequest()).getContextPath();
139 String tableId = table.getId();
140 String curPage = Integer.toString(startRow / maxRows + 1);
141 String pageSize = Integer.toString(maxRows);
142 Object [] args = { contextPath, tableId, curPage, pageSize};
143
144 boolean havePrevious = false;
145 String prevButton = "";
146 if (table.getStartRow() > 0) {
147 prevButton = res.getString("sqltable.page.button.prev", args);
148 RequestListener r = new PrevButton(table);
149 table.addRequestListener(table.getId() + ".prev", null, r);
150 havePrevious = true;
151 }
152
153 boolean haveNext = false;
154 String nextButton = "";
155 Result result = (Result) ExprUtils.getModelReference(pageContext, resultExpr);
156 if (result.isLimitedByMaxRows()) {
157 nextButton = res.getString("sqltable.page.button.next", args);
158 RequestListener r = new NextButton(table);
159 table.addRequestListener(table.getId() + ".next", null, r);
160 haveNext = true;
161 }
162
163 RequestListener r = new GotoButton(table);
164 table.addRequestListener(table.getId() + ".goto.button", null, r);
165 r = new PageSizeButton(table);
166 table.addRequestListener(table.getId() + ".size.button", null, r);
167
168 String show = res.getString("sqltable.page.show", args);
169 String go = res.getString("sqltable.page.goto", args);
170 String size = res.getString("sqltable.page.size", args);
171 try {
172 JspWriter out = pageContext.getOut();
173 if (havePrevious) {
174 out.print(prevButton);
175 out.print(" ");
176 }
177 if (havePrevious || haveNext) {
178 out.print(show);
179 out.print(" ");
180 }
181 if (haveNext) {
182 out.print(nextButton);
183 out.print(" ");
184 }
185 if (havePrevious || haveNext) {
186 out.print(go);
187 out.print(" ");
188 }
189 pageContext.getOut().print(size);
190 } catch (IOException e) {
191 logger.error(null, e);
192 }
193 return SKIP_BODY;
194 }
195
196 public void setResult(String result) {
197 this.resultExpr = result;
198 }
199 }
200 |
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