1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
|
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.util.digester;
import org.xml.sax.Attributes;
/**
* <p>Rule implementation that saves a parameter for use by a surrounding
* <code>CallMethodRule<code>.</p>
*
* <p>This parameter may be:
* <ul>
* <li>from an attribute of the current element
* See {@link #CallParamRule(int paramIndex, String attributeName)}
* <li>from current the element body
* See {@link #CallParamRule(int paramIndex)}
* <li>from the top object on the stack.
* See {@link #CallParamRule(int paramIndex, boolean fromStack)}
* <li>the current path being processed (separate <code>Rule</code>).
* See {@link PathCallParamRule}
* </ul>
* </p>
*/
public class CallParamRule extends Rule {
// ----------------------------------------------------------- Constructors
/**
* Construct a "call parameter" rule that will save the body text of this
* element as the parameter value.
*
* @param digester The associated Digester
* @param paramIndex The zero-relative parameter number
*
* @deprecated The digester instance is now set in the {@link Digester#addRule} method.
* Use {@link #CallParamRule(int paramIndex)} instead.
*/
public CallParamRule(Digester digester, int paramIndex) {
this(paramIndex);
}
/**
* Construct a "call parameter" rule that will save the value of the
* specified attribute as the parameter value.
*
* @param digester The associated Digester
* @param paramIndex The zero-relative parameter number
* @param attributeName The name of the attribute to save
*
* @deprecated The digester instance is now set in the {@link Digester#addRule} method.
* Use {@link #CallParamRule(int paramIndex, String attributeName)} instead.
*/
public CallParamRule(Digester digester, int paramIndex,
String attributeName) {
this(paramIndex, attributeName);
}
/**
* Construct a "call parameter" rule that will save the body text of this
* element as the parameter value.
*
* @param paramIndex The zero-relative parameter number
*/
public CallParamRule(int paramIndex) {
this(paramIndex, null);
}
/**
* Construct a "call parameter" rule that will save the value of the
* specified attribute as the parameter value.
*
* @param paramIndex The zero-relative parameter number
* @param attributeName The name of the attribute to save
*/
public CallParamRule(int paramIndex,
String attributeName) {
this.paramIndex = paramIndex;
this.attributeName = attributeName;
}
/**
* Construct a "call parameter" rule.
*
* @param paramIndex The zero-relative parameter number
* @param fromStack should this parameter be taken from the top of the stack?
*/
public CallParamRule(int paramIndex, boolean fromStack) {
this.paramIndex = paramIndex;
this.fromStack = fromStack;
}
/**
* Constructs a "call parameter" rule which sets a parameter from the stack.
* If the stack contains too few objects, then the parameter will be set to null.
*
* @param paramIndex The zero-relative parameter number
* @param stackIndex the index of the object which will be passed as a parameter.
* The zeroth object is the top of the stack, 1 is the next object down and so on.
*/
public CallParamRule(int paramIndex, int stackIndex) {
this.paramIndex = paramIndex;
this.fromStack = true;
this.stackIndex = stackIndex;
}
// ----------------------------------------------------- Instance Variables
/**
* The attribute from which to save the parameter value
*/
protected String attributeName = null;
/**
* The zero-relative index of the parameter we are saving.
*/
protected int paramIndex = 0;
/**
* Is the parameter to be set from the stack?
*/
protected boolean fromStack = false;
/**
* The position of the object from the top of the stack
*/
protected int stackIndex = 0;
/**
* Stack is used to allow nested body text to be processed.
* Lazy creation.
*/
protected ArrayStack bodyTextStack;
// --------------------------------------------------------- Public Methods
/**
* Process the start of this element.
*
* @param attributes The attribute list for this element
*/
public void begin(Attributes attributes) throws Exception {
Object param = null;
if (attributeName != null) {
param = attributes.getValue(attributeName);
} else if(fromStack) {
param = digester.peek(stackIndex);
if (digester.log.isDebugEnabled()) {
StringBuffer sb = new StringBuffer("[CallParamRule]{");
sb.append(digester.match);
sb.append("} Save from stack; from stack?").append(fromStack);
sb.append("; object=").append(param);
digester.log.debug(sb.toString());
}
}
// Have to save the param object to the param stack frame here.
// Can't wait until end(). Otherwise, the object will be lost.
// We can't save the object as instance variables, as
// the instance variables will be overwritten
// if this CallParamRule is reused in subsequent nesting.
if(param != null) {
Object parameters[] = (Object[]) digester.peekParams();
parameters[paramIndex] = param;
}
}
/**
* Process the body text of this element.
*
* @param bodyText The body text of this element
*/
public void body(String bodyText) throws Exception {
if (attributeName == null && !fromStack) {
// We must wait to set the parameter until end
// so that we can make sure that the right set of parameters
// is at the top of the stack
if (bodyTextStack == null) {
bodyTextStack = new ArrayStack();
}
bodyTextStack.push(bodyText.trim());
}
}
/**
* Process any body texts now.
*/
public void end(String namespace, String name) {
if (bodyTextStack != null && !bodyTextStack.empty()) {
// what we do now is push one parameter onto the top set of parameters
Object parameters[] = (Object[]) digester.peekParams();
parameters[paramIndex] = bodyTextStack.pop();
}
}
/**
* Render a printable version of this Rule.
*/
public String toString() {
StringBuffer sb = new StringBuffer("CallParamRule[");
sb.append("paramIndex=");
sb.append(paramIndex);
sb.append(", attributeName=");
sb.append(attributeName);
sb.append(", from stack=");
sb.append(fromStack);
sb.append("]");
return (sb.toString());
}
}
|
