====== Foreign Key ======

**''public class ForeignKey''** \\
**''implements Serializable''**

Foreign Key describes a foreign key dependency between two relations from the common schema \\

''(sourceRelation[sourceAttriutes] REFERENCES targetRealtion[targetKey])''

===== Class Attributes =====
<code java>
private long id;
private Relation sourceRelation;
private Relation targetRelation;
private java.util.ArrayList<Integer> sourceAttributes;
private boolean virtual;
private boolean enforced;
</code>

===== Class Constructors =====
==== ForeignKey ====

<code java>
public ForeignKey()
</code>

Default constructor

----

==== ForeignKey ====

<code java>
public ForeignKey (Relation sourceRelation, 
                   Relation targetRelation,
		   java.util.ArrayList<Integer> sourceAttributes)
</code>

Constructor that store also values inside the class attributes.

//Called by://
  * it.unibz.inf.magik.web.SessionControl
  * it.unibz.inf.magik.db.DatabaseConnector
  * it.unibz.inf.magik.test.CycleDetectionTest
  * it.unibz.inf.magik.test.TestFK
  * it.unibz.inf.magik.test.TestFK2
  * it.unibz.inf.magik.test.TestHardCaseFDCandFK
  * it.unibz.inf.magik.test.TestQueryGeneralization
  * it.unibz.inf.magik.test.TCQCReasonerFKandFD
  * it.unibz.inf.magik.test.TCQCReasonerTCSuggestions
  * it.unibz.inf.magik.test.TestQueryClass

**Parameters:**
  * sourceRelation - source relation
  * targetRelation - target relation
  * sourceAttributes - source attributes (position)
===== Class Methods =====

==== printHTML ====

<code java>
public java.lang.String printHTML()
</code>

This method is used for create a compact view of a foreign key (''table[field] -> table2[field]'')

**Returns:**
  * foreign key adapted to the compact view


----

==== getters and setters methods ====
<code java>
public Relation getSourceRelation() 
public void setSourceRelation(Relation sourceRelation) 

public Relation getTargetRelation() 
public void setTargetRelation(Relation targetRelation) 
	
public java.util.ArrayList<Integer> getSourceAttributes() 
public void setSourceAttributes(java.util.ArrayList<Integer> sourceAttributes) 

public long getId() 
public void setId(long id) 

public boolean isVirtual()
public void setVirtual(boolean virtual) 

public boolean isEnforced() 
public void setEnforced(boolean enforced) 

public Integer getTargetKey()
</code>

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