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1
61
62
63
64 package org.jaxen.expr;
65
66 import java.util.Iterator  ;
67 import java.util.List ;
68 import org.jaxen.Context;
69 import org.jaxen.JaxenException;
70 import org.jaxen.Navigator;
71 import org.jaxen.function.BooleanFunction;
72 import org.jaxen.function.NumberFunction;
73 import org.jaxen.function.StringFunction;
74
75 abstract class DefaultEqualityExpr extends DefaultTruthExpr implements EqualityExpr
76 {
77 DefaultEqualityExpr( Expr lhs, Expr rhs )
78 {
79 super( lhs, rhs );
80 }
81
82 public String toString()
83 {
84 return "[(DefaultEqualityExpr): " + getLHS() + ", " + getRHS() + "]";
85 }
86
87 public Object evaluate( Context context ) throws JaxenException
88 {
89 Object lhsValue = getLHS().evaluate( context );
90 Object rhsValue = getRHS().evaluate( context );
91
92 if( lhsValue == null || rhsValue == null )
93 {
94 return Boolean.FALSE;
95 }
96
97 Navigator nav = context.getNavigator();
98
99 if( bothAreSets( lhsValue, rhsValue ) )
100 {
101 return evaluateSetSet( (List ) lhsValue, (List ) rhsValue, nav );
102 }
103 else if ( eitherIsSet( lhsValue, rhsValue ) )
104 {
105 if ( isSet( lhsValue ) )
106 {
107 return evaluateSetSet( (List ) lhsValue, convertToList( rhsValue ), nav );
108 }
109 else
110 {
111 return evaluateSetSet( convertToList( lhsValue ), (List ) rhsValue, nav );
112 }
113 }
114 else
115 {
116 return evaluateObjectObject( lhsValue, rhsValue, nav ) ? Boolean.TRUE : Boolean.FALSE;
117 }
118 }
119
120 private Boolean evaluateSetSet( List lhsSet, List rhsSet, Navigator nav )
121 {
122 if( setIsEmpty( lhsSet ) || setIsEmpty( rhsSet ) )
123 {
124 return Boolean.FALSE;
125 }
126
127 for( Iterator lhsIterator = lhsSet.iterator(); lhsIterator.hasNext(); )
128 {
129 Object lhs = lhsIterator.next();
130
131 for( Iterator rhsIterator = rhsSet.iterator(); rhsIterator.hasNext(); )
132 {
133 Object rhs = rhsIterator.next();
134
135 if( evaluateObjectObject( lhs, rhs, nav ) )
136 {
137 return Boolean.TRUE;
138 }
139 }
140 }
141
142 return Boolean.FALSE;
143 }
144
145 private boolean evaluateObjectObject( Object lhs, Object rhs, Navigator nav )
146 {
147 if( eitherIsBoolean( lhs, rhs ) )
148 {
149 return evaluateObjectObject( BooleanFunction.evaluate( lhs, nav ),
150 BooleanFunction.evaluate( rhs, nav ) );
151 }
152 else if( eitherIsNumber( lhs, rhs ) )
153 {
154 return evaluateObjectObject( NumberFunction.evaluate( lhs,
155 nav ),
156 NumberFunction.evaluate( rhs,
157 nav ) );
158 }
159 else
160 {
161 return evaluateObjectObject( StringFunction.evaluate( lhs,
162 nav ),
163 StringFunction.evaluate( rhs,
164 nav ) );
165 }
166 }
167
168 protected abstract boolean evaluateObjectObject( Object lhs, Object rhs );
169 }
170 |
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