|
1
55
56 package org.apache.commons.el;
57
58 import java.util.List  ;
59 import javax.servlet.jsp.el.ELException ;
60 import javax.servlet.jsp.el.VariableResolver ;
61 import javax.servlet.jsp.el.FunctionMapper ;
62
63
72
73 public class UnaryOperatorExpression
74 extends Expression
75 {
76
81 UnaryOperator mOperator;
82 public UnaryOperator getOperator ()
83 { return mOperator; }
84 public void setOperator (UnaryOperator pOperator)
85 { mOperator = pOperator; }
86
87
90 List mOperators;
91 public List getOperators ()
92 { return mOperators; }
93 public void setOperators (List pOperators)
94 { mOperators = pOperators; }
95
96
99 Expression mExpression;
100 public Expression getExpression ()
101 { return mExpression; }
102 public void setExpression (Expression pExpression)
103 { mExpression = pExpression; }
104
105
110 public UnaryOperatorExpression (UnaryOperator pOperator,
111 List pOperators,
112 Expression pExpression)
113 {
114 mOperator = pOperator;
115 mOperators = pOperators;
116 mExpression = pExpression;
117 }
118
119
126 public String getExpressionString ()
127 {
128 StringBuffer buf = new StringBuffer ();
129 buf.append ("(");
130 if (mOperator != null) {
131 buf.append (mOperator.getOperatorSymbol ());
132 buf.append (" ");
133 }
134 else {
135 for (int i = 0; i < mOperators.size (); i++) {
136 UnaryOperator operator = (UnaryOperator) mOperators.get (i);
137 buf.append (operator.getOperatorSymbol ());
138 buf.append (" ");
139 }
140 }
141 buf.append (mExpression.getExpressionString ());
142 buf.append (")");
143 return buf.toString ();
144 }
145
146
151 public Object evaluate (VariableResolver pResolver,
152 FunctionMapper functions,
153 Logger pLogger)
154 throws ELException
155 {
156 Object value = mExpression.evaluate (pResolver, functions, pLogger);
157 if (mOperator != null) {
158 value = mOperator.apply (value, pLogger);
159 }
160 else {
161 for (int i = mOperators.size () - 1; i >= 0; i--) {
162 UnaryOperator operator = (UnaryOperator) mOperators.get (i);
163 value = operator.apply (value, pLogger);
164 }
165 }
166 return value;
167 }
168
169 }
171 |
Popular Tags |
Java API By Example, From Geeks To Geeks.