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25 
26 package javax.management;
27 
28 
29 /**
30  * This class is used by the query-building mechanism to represent binary
31  * operations.
32  * @serial include
33  *
34  * @since 1.5
35  */
36 class BinaryRelQueryExp extends QueryEval implements QueryExp {
37 
38     /* Serial version */
39     private static final long serialVersionUID = -5690656271650491000L;
40 
41     /**
42      * @serial The operator
43      */
44     private int relOp;
45 
46     /**
47      * @serial The first value
48      */
49     private ValueExp exp1;
50 
51     /**
52      * @serial The second value
53      */
54     private ValueExp exp2;
55 
56 
57     /**
58      * Basic Constructor.
59      */
BinaryRelQueryExp()60     public BinaryRelQueryExp() {
61     }
62 
63     /**
64      * Creates a new BinaryRelQueryExp with operator op applied on v1 and
65      * v2 values.
66      */
BinaryRelQueryExp(int op, ValueExp v1, ValueExp v2)67     public BinaryRelQueryExp(int op, ValueExp v1, ValueExp v2) {
68         relOp = op;
69         exp1  = v1;
70         exp2  = v2;
71     }
72 
73 
74     /**
75      * Returns the operator of the query.
76      */
getOperator()77     public int getOperator()  {
78         return relOp;
79     }
80 
81     /**
82      * Returns the left value of the query.
83      */
getLeftValue()84     public ValueExp getLeftValue()  {
85         return exp1;
86     }
87 
88     /**
89      * Returns the right value of the query.
90      */
getRightValue()91     public ValueExp getRightValue()  {
92         return exp2;
93     }
94 
95     /**
96      * Applies the BinaryRelQueryExp on an MBean.
97      *
98      * @param name The name of the MBean on which the BinaryRelQueryExp will be applied.
99      *
100      * @return  True if the query was successfully applied to the MBean, false otherwise.
101      *
102      * @exception BadStringOperationException
103      * @exception BadBinaryOpValueExpException
104      * @exception BadAttributeValueExpException
105      * @exception InvalidApplicationException
106      */
apply(ObjectName name)107     public boolean apply(ObjectName name) throws BadStringOperationException, BadBinaryOpValueExpException,
108         BadAttributeValueExpException, InvalidApplicationException  {
109         Object val1 = exp1.apply(name);
110         Object val2 = exp2.apply(name);
111         boolean numeric = val1 instanceof NumericValueExp;
112         boolean bool = val1 instanceof BooleanValueExp;
113         if (numeric) {
114             if (((NumericValueExp)val1).isLong()) {
115                 long lval1 = ((NumericValueExp)val1).longValue();
116                 long lval2 = ((NumericValueExp)val2).longValue();
117 
118                 switch (relOp) {
119                 case Query.GT:
120                     return lval1 > lval2;
121                 case Query.LT:
122                     return lval1 < lval2;
123                 case Query.GE:
124                     return lval1 >= lval2;
125                 case Query.LE:
126                     return lval1 <= lval2;
127                 case Query.EQ:
128                     return lval1 == lval2;
129                 }
130             } else {
131                 double dval1 = ((NumericValueExp)val1).doubleValue();
132                 double dval2 = ((NumericValueExp)val2).doubleValue();
133 
134                 switch (relOp) {
135                 case Query.GT:
136                     return dval1 > dval2;
137                 case Query.LT:
138                     return dval1 < dval2;
139                 case Query.GE:
140                     return dval1 >= dval2;
141                 case Query.LE:
142                     return dval1 <= dval2;
143                 case Query.EQ:
144                     return dval1 == dval2;
145                 }
146             }
147 
148         } else if (bool) {
149 
150             boolean bval1 = ((BooleanValueExp)val1).getValue().booleanValue();
151             boolean bval2 = ((BooleanValueExp)val2).getValue().booleanValue();
152 
153             switch (relOp) {
154             case Query.GT:
155                 return bval1 && !bval2;
156             case Query.LT:
157                 return !bval1 && bval2;
158             case Query.GE:
159                 return bval1 || !bval2;
160             case Query.LE:
161                 return !bval1 || bval2;
162             case Query.EQ:
163                 return bval1 == bval2;
164             }
165 
166         } else {
167             String sval1 = ((StringValueExp)val1).getValue();
168             String sval2 = ((StringValueExp)val2).getValue();
169 
170             switch (relOp) {
171             case Query.GT:
172                 return sval1.compareTo(sval2) > 0;
173             case Query.LT:
174                 return sval1.compareTo(sval2) < 0;
175             case Query.GE:
176                 return sval1.compareTo(sval2) >= 0;
177             case Query.LE:
178                 return sval1.compareTo(sval2) <= 0;
179             case Query.EQ:
180                 return sval1.compareTo(sval2) == 0;
181             }
182         }
183 
184         return false;
185     }
186 
187     /**
188      * Returns the string representing the object.
189      */
190     @Override
toString()191     public String toString()  {
192         return "(" + exp1 + ") " + relOpString() + " (" + exp2 + ")";
193     }
194 
relOpString()195     private String relOpString() {
196         switch (relOp) {
197         case Query.GT:
198             return ">";
199         case Query.LT:
200             return "<";
201         case Query.GE:
202             return ">=";
203         case Query.LE:
204             return "<=";
205         case Query.EQ:
206             return "=";
207         }
208 
209         return "=";
210     }
211 
212  }
213