ParentRecEvalContext.java 

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package blog;

import java.util.*;
Implementation of the EvalContext interface that records the basic random variables used by calls to the access methods. The getParents method returns this set of variables. 


public class ParentRecEvalContext extends DefaultEvalContext {
Creates a new ParentRecEvalContext using the given world. 


    public ParentRecEvalContext(PartialWorld world) {
	super(world);
    }
Creates a new ParentRecEvalContext using the given world. If the errorIfUndet flag is true, the access methods on this instance will print error messages and exit the program if the world is not complete enough to determine the correct return value. Otherwise they will just return null in such cases. 


    public ParentRecEvalContext(PartialWorld world, boolean errorIfUndet) {
	super(world, errorIfUndet);
    }

    public Object getValue(BasicVar var) {
	Object value = world.getValue(var);
	if (value == null) {
	    latestUninstParent = var;
	    var.ensureStable();
	    handleMissingVar(var);
	} else {
	    if (parents.add(var)) {
		var.ensureStable();
	    }
	}
	return value;
    }

    // Note that we don't have to override getSatisfiers, because the 
    // DefaultEvalContext implementation of getSatisfiers calls getValue 
    // on the number variable

    public NumberVar getPOPAppSatisfied(Object obj) {
	if (obj instanceof NonGuaranteedObject) {
	    return ((NonGuaranteedObject) obj).getNumberVar();
	} 

	if (obj instanceof ObjectIdentifier) {
	    parents.add(new OriginVar((ObjectIdentifier) obj));
	    return world.getPOPAppSatisfied(obj);
	}

	// Must be guaranteed object, so not generated by any number var
	return null;
    }
Returns the set of basic random variables that are instantiated and whose values have been used in calls to the access methods. This set is backed by the ParentRecEvalContext and will change as more random variables are used.

Returns:  unmodifiable Set of BasicVar 


    public Set getParents() {
	return Collections.unmodifiableSet(parents);
    }
Returns the variable whose value was most recently needed by an access method, but which is not instantiated. This method returns null if no such variable exists. 


    public BasicVar getLatestUninstParent() {
	return latestUninstParent;
    }

    protected Set parents = new LinkedHashSet(); // of BasicVar
    protected BasicVar latestUninstParent = null;
}

This file was generated on Tue Jun 08 17:53:36 PDT 2010 from file ParentRecEvalContext.java
by the ilog.language.tools.Hilite Java tool written by Hassan Aït-Kaci