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Java Source Code / Java Documentation » RSS RDF » Jena 2.5.5 » com.hp.hpl.jena.reasoner.rulesys.impl   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    com.hp.hpl.jena.reasoner.rulesys.impl.BindingStack BindingStack public class BindingStack implements BindingEnvironment(Code) Provides a trail of possible variable bindings for a forward rule. author:    Dave Reynolds version:    $Revision: 1.12 $ on $Date: 2008/01/02 12:06:16 $ Field Summary protected  Node[] environment      protected  int index      protected  ArrayList trail      Constructor Summary public   BindingStack()      Constructor. Method Summary public  boolean bind(int i, Node value)      Bind the ith variable in the current envionment to the given value. public  boolean bind(Node var, Node value)      Bind a variable in the current envionment to the given value. public  void bindNoCheck(Node_RuleVariable var, Node value)      Bind a variable in the current envionment to the given value. public  void commit()      Forget the previously pushed state but keep the current environment. public  Node getBinding(Node node)      If the node is a variable then return the current binding (null if not bound) otherwise return the node itself. public  Node[] getEnvironment()      public  Node getGroundVersion(Node node)      Return the most ground version of the node. public  Triple instantiate(TriplePattern pattern)      Instantiate a triple pattern against the current environment. public  void push()      public  void reset(int newSize)      Reset the binding environment to empty. public  void unwind()      Forget the current environment and return the previously pushed state. Field Detail environment protected Node[] environment(Code) The current binding set index protected int index(Code) Index of the current binding set trail protected ArrayList trail(Code) A stack of prior binding sets Constructor Detail BindingStack public BindingStack()(Code) Constructor. The stack isn't ready for use until reset has been called. Method Detail bind public boolean bind(int i, Node value)(Code) Bind the ith variable in the current envionment to the given value. Checks that the new binding is compatible with any current binding. false if the binding fails bind public boolean bind(Node var, Node value)(Code) Bind a variable in the current envionment to the given value. Checks that the new binding is compatible with any current binding. Parameters:   var - a Node_RuleVariable defining the variable to bind Parameters:   value - the value to bind false if the binding fails bindNoCheck public void bindNoCheck(Node_RuleVariable var, Node value)(Code) Bind a variable in the current envionment to the given value. Overrides and ignores any current binding. Parameters:   var - a Node_RuleVariable defining the variable to bind Parameters:   value - the value to bind commit public void commit() throws IndexOutOfBoundsException(Code) Forget the previously pushed state but keep the current environment. throws:   IndexOutOfBoundsException - if there was not previous push getBinding public Node getBinding(Node node)(Code) If the node is a variable then return the current binding (null if not bound) otherwise return the node itself. getEnvironment public Node[] getEnvironment()(Code) Return the current array of bindings getGroundVersion public Node getGroundVersion(Node node)(Code) Return the most ground version of the node. If the node is not a variable just return it, if it is a varible bound in this enviroment return the binding, if it is an unbound variable return the variable. instantiate public Triple instantiate(TriplePattern pattern)(Code) Instantiate a triple pattern against the current environment. This version handles unbound varibles by turning them into bNodes. Parameters:   clause - the triple pattern to match Parameters:   env - the current binding environment a new, instantiated triple push public void push()(Code) Save the current environment on an internal stack reset public void reset(int newSize)(Code) Reset the binding environment to empty. Parameters:   newSize - the number of variables needed for processing the new rule unwind public void unwind() throws IndexOutOfBoundsException(Code) Forget the current environment and return the previously pushed state. throws:   IndexOutOfBoundsException - if there was not previous push Methods inherited from java.lang.Object native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object obj)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final native public Class getClass()(Code)(Java Doc) native public int hashCode()(Code)(Java Doc) final native public void notify()(Code)(Java Doc) final native public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc) final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)