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
|
/*
* 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.
*/
/* Generated By:JJTree: Do not edit this line. AstLambdaExpression.java Version 4.3 */
package org.apache.el.parser;
import java.util.ArrayList;
import java.util.List;
import javax.el.ELException;
import javax.el.LambdaExpression;
import org.apache.el.ValueExpressionImpl;
import org.apache.el.lang.EvaluationContext;
import org.apache.el.lang.LambdaExpressionNestedState;
import org.apache.el.util.MessageFactory;
public class AstLambdaExpression extends SimpleNode {
public AstLambdaExpression(int id) {
super(id);
}
@Override
public Object getValue(EvaluationContext ctx) throws ELException {
// Correct evaluation requires knowledge of the whole set of nested
// expressions, not just the current expression
LambdaExpressionNestedState state = ctx.getLambdaExpressionNestedState();
if (state == null) {
// This must be an outer lambda expression. Create and populate the
// state.
state = new LambdaExpressionNestedState();
populateNestedState(state);
ctx.setLambdaExpressionNestedState(state);
}
// Check that there are not more sets of parameters than there are
// nested expressions.
int methodParameterSetCount = jjtGetNumChildren() - 2;
if (methodParameterSetCount > state.getNestingCount()) {
throw new ELException(MessageFactory.get(
"error.lambda.tooManyMethodParameterSets"));
}
// First child is always parameters even if there aren't any
AstLambdaParameters formalParametersNode =
(AstLambdaParameters) children[0];
Node[] formalParamNodes = formalParametersNode.children;
// Second child is a value expression
ValueExpressionImpl ve = new ValueExpressionImpl("", children[1],
ctx.getFunctionMapper(), ctx.getVariableMapper(), null);
// Build a LambdaExpression
List<String> formalParameters = new ArrayList<>();
if (formalParamNodes != null) {
for (Node formalParamNode : formalParamNodes) {
formalParameters.add(formalParamNode.getImage());
}
}
LambdaExpression le = new LambdaExpression(formalParameters, ve);
le.setELContext(ctx);
if (jjtGetNumChildren() == 2) {
// No method parameters
// Can only invoke the expression if none of the lambda expressions
// in the nesting declare parameters
if (state.getHasFormalParameters()) {
return le;
} else {
return le.invoke(ctx, (Object[]) null);
}
}
/*
* This is a (possibly nested) lambda expression with one or more sets
* of parameters provided.
*
* If there are more nested expressions than sets of parameters this may
* return a LambdaExpression.
*
* If there are more sets of parameters than nested expressions an
* ELException will have been thrown by the check at the start of this
* method.
*/
// Always have to invoke the outer-most expression
int methodParameterIndex = 2;
Object result = le.invoke(((AstMethodParameters)
children[methodParameterIndex]).getParameters(ctx));
methodParameterIndex++;
while (result instanceof LambdaExpression &&
methodParameterIndex < jjtGetNumChildren()) {
result = ((LambdaExpression) result).invoke(((AstMethodParameters)
children[methodParameterIndex]).getParameters(ctx));
methodParameterIndex++;
}
return result;
}
private void populateNestedState(LambdaExpressionNestedState lambdaExpressionNestedState) {
// Increment the nesting count for the current expression
lambdaExpressionNestedState.incrementNestingCount();
if (jjtGetNumChildren() > 1) {
Node firstChild = jjtGetChild(0);
if (firstChild instanceof AstLambdaParameters) {
if (firstChild.jjtGetNumChildren() > 0) {
lambdaExpressionNestedState.setHasFormalParameters();
}
} else {
// Can't be a lambda expression
return;
}
Node secondChild = jjtGetChild(1);
if (secondChild instanceof AstLambdaExpression) {
((AstLambdaExpression) secondChild).populateNestedState(lambdaExpressionNestedState);
}
}
}
@Override
public String toString() {
// Purely for debug purposes. May not be complete or correct. Certainly
// is not efficient. Be sure not to call this from 'real' code.
StringBuilder result = new StringBuilder();
for (Node n : children) {
result.append(n.toString());
}
return result.toString();
}
}
/* JavaCC - OriginalChecksum=071159eff10c8e15ec612c765ae4480a (do not edit this line) */
|
