java.lang.Object
- com.ibm.wala.ipa.callgraph.impl.UnionContextSelector

All Implemented Interfaces:

ContextSelector
```
public class UnionContextSelector
extends Object
implements ContextSelector
```
Checks ContextSelectors A and B, then returns the union of their findings. The returned Context contains the ContextKeys from A and B. If for a given key a value is generated by A as well as B the value generated by A has the precedence. As the UnionContextSelector optionally returns a DelegatingContext it cannot be used to anihilate ContextValues of B to null.

See Also:

DelegatingContextSelector

Constructor Summary

Constructors
Constructor Description

UnionContextSelector(ContextSelector A, ContextSelector B)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Context`	`getCalleeTarget(CGNode caller, CallSiteReference site, IMethod callee, InstanceKey[] receiver)`	If only one Context exists return it, else return a DelegatingContext.
`IntSet`	`getRelevantParameters(CGNode caller, CallSiteReference site)`	Given a calling node and a call site, return the set of parameters based on which this selector may choose to specialize contexts.
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - UnionContextSelector
```
public UnionContextSelector(ContextSelector A,
                            ContextSelector B)
```
- Method Detail
  - getCalleeTarget
```
public Context getCalleeTarget(CGNode caller,
                               CallSiteReference site,
                               IMethod callee,
                               InstanceKey[] receiver)
```
    If only one Context exists return it, else return a DelegatingContext.
    
    Specified by:
    
    getCalleeTarget in interface ContextSelector
    
    Parameters:
    
    caller - the node containing the call site
    
    site - description of the call site
    
    receiver - the abstract objects (InstanceKeys) of parameters of interest to the selector
    
    Returns:
    
    the Context in which the callee should be evaluated, or null if no information is available.
  - getRelevantParameters
```
public IntSet getRelevantParameters(CGNode caller,
                                    CallSiteReference site)
```
    Description copied from interface: ContextSelector
    
    Given a calling node and a call site, return the set of parameters based on which this selector may choose to specialize contexts.
    
    Specified by:
    
    getRelevantParameters in interface ContextSelector
    
    Parameters:
    
    caller - the calling node
    
    site - the specific call site
    
    Returns:
    
    the set of parameters of interest
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Class UnionContextSelector

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

UnionContextSelector

Method Detail

getCalleeTarget

getRelevantParameters

toString