JML

org.jmlspecs.models
Class JMLObjectSequenceEnumerator

java.lang.Object
  extended byorg.jmlspecs.models.JMLObjectSequenceEnumerator
All Implemented Interfaces:
Cloneable, Enumeration, JMLEnumeration, JMLObjectType, JMLType, Serializable

public class JMLObjectSequenceEnumerator
extends Object
implements JMLEnumeration, JMLObjectType

An enumerator for sequences of objects.

Version:
$Revision: 1.32 $
Author:
Gary T. Leavens, with help from Albert Baker, Clyde Ruby, and others.
See Also:
JMLEnumeration, JMLType, JMLObjectSequence, JMLValueSequence, JMLEnumerationToIterator

Class Specifications
public invariant this.uniteratedElems != null;
public invariant this.moreElements <==> this.remaining != 0;
public invariant this.remaining >= 0;
protected invariant this.currentNode == null <==> this.remaining == 0;
public invariant this.elementType <: \type(java.lang.Object);
public invariant !this.uniteratedElems.isEmpty() ==> this.uniteratedElems.elementType <: this.elementType;
public invariant !this.returnsNull ==> this.uniteratedElems.isEmpty()||!this.uniteratedElems.containsNull;
public constraint this.returnsNull == \old(this.returnsNull);
protected represents uniteratedElems <- new org.jmlspecs.models.JMLObjectSequence(this.currentNode, this.remaining);

Specifications inherited from class Object
represents objectState <- org.jmlspecs.lang.JMLDataGroup.IT;
public represents _getClass <- \typeof(this);

Specifications inherited from interface JMLEnumeration
instance public represents moreElements <- this.hasMoreElements();

Model Field Summary
 JMLObjectSequence uniteratedElems
          The elements that have not yet been returned by nextElement.
 
Model fields inherited from class java.lang.Object
_getClass, objectState, theString
 
Model fields inherited from interface java.util.Enumeration
moreElements
 
Ghost Field Summary
 
Ghost fields inherited from class java.lang.Object
objectTimesFinalized, owner
 
Ghost fields inherited from interface java.util.Enumeration
elementType, returnsNull
 
Field Summary
protected  JMLListObjectNode currentNode
          The list representing the elements yet to be returned.
[spec_public] protected  int remaining
          The number of elements remaining to return.
 
Constructor Summary
(package private) JMLObjectSequenceEnumerator(non_null JMLObjectSequence s)
          Initialize this with the given sequence.
 
Model Method Summary
 
Model methods inherited from class java.lang.Object
hashValue
 
Method Summary
 Object clone()
          Return a clone of this enumerator.
 boolean equals(nullable Object oth)
          Return true just when this enumerator has the same state as the given argument..
 int hashCode()
          Return a hash code for this enumerator.
 boolean hasMoreElements()
          Tells whether this enumerator has more uniterated elements.
 Object nextElement()
          Return the next element in the sequence, counting up, if there is one.
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, toString, wait, wait, wait
 

Model Field Detail

uniteratedElems

public JMLObjectSequence uniteratedElems
The elements that have not yet been returned by nextElement.

Specifications:
is in groups: objectState
datagroup contains: currentNode remaining
Field Detail

currentNode

protected JMLListObjectNode currentNode
The list representing the elements yet to be returned.

Specifications:
is in groups: uniteratedElems

remaining

protected int remaining
The number of elements remaining to return.

Specifications: spec_public
is in groups: uniteratedElems
Constructor Detail

JMLObjectSequenceEnumerator

JMLObjectSequenceEnumerator(non_null JMLObjectSequence s)
Initialize this with the given sequence.

Specifications:
normal_behavior
requires s != null;
assignable uniteratedElems;
assignable moreElements, elementType, returnsNull, owner;
ensures this.uniteratedElems.equals(s);
ensures this.owner == null;
ensures this.elementType == s.elementType;
ensures this.returnsNull == s.containsNull;
Method Detail

hasMoreElements

public boolean hasMoreElements()
Tells whether this enumerator has more uniterated elements.

Specified by:
hasMoreElements in interface JMLEnumeration
Specifications: pure
     also
public normal_behavior
ensures \result == !this.uniteratedElems.isEmpty();
ensures \result <==> this.remaining > 0;
Specifications inherited from overridden method in interface JMLEnumeration:
       pure
     also
assignable \nothing;
Specifications inherited from overridden method in interface Enumeration:
public normal_behavior
assignable objectState;
ensures \result <==> this.moreElements;

nextElement

public Object nextElement()
                   throws JMLNoSuchElementException
Return the next element in the sequence, counting up, if there is one.

Specified by:
nextElement in interface Enumeration
Throws:
JMLNoSuchElementException - when this is empty.
Specifications:
     also
public normal_behavior
requires this.hasMoreElements();
assignable uniteratedElems, moreElements;
ensures \old(this.uniteratedElems).itemAt(0) == \result &&this.uniteratedElems.equals(\old(this.uniteratedElems).trailer());
     also
public exceptional_behavior
requires !this.hasMoreElements();
assignable \nothing;
signals (org.jmlspecs.models.JMLNoSuchElementException) true;
     also
protected normal_behavior
requires this.remaining > 0;
assignable uniteratedElems, moreElements;
assignable_redundantly currentNode, remaining;
ensures this.currentNode == \old(this.currentNode.next)&&this.remaining == \old(this.remaining-1);
Specifications inherited from overridden method in interface Enumeration:
       nullable
public normal_behavior
requires this.moreElements;
assignable objectState;
assignable moreElements;
ensures (\result == null)||\typeof(\result ) <: this.elementType;
ensures !this.returnsNull ==> (\result != null);
     also
public exceptional_behavior
requires !this.moreElements;
assignable \nothing;
signals_only java.util.NoSuchElementException;

clone

public Object clone()
Return a clone of this enumerator.

Specified by:
clone in interface JMLEnumeration
Overrides:
clone in class Object
Specifications: non_null (inherited)pure
Specifications inherited from overridden method in class Object:
       non_null
protected normal_behavior
requires this instanceof java.lang.Cloneable;
assignable \nothing;
ensures \result != null;
ensures \typeof(\result ) == \typeof(this);
ensures (* \result is a clone of this *);
     also
protected normal_behavior
requires this.getClass().isArray();
assignable \nothing;
ensures \elemtype(\typeof(\result )) == \elemtype(\typeof(this));
ensures ((java.lang.Object[])\result ).length == ((java.lang.Object[])this).length;
ensures ( \forall int i; 0 <= i&&i < ((java.lang.Object[])this).length; ((java.lang.Object[])\result )[i] == ((java.lang.Object[])this)[i]);
     also
requires this.getClass().isArray();
assignable \nothing;
ensures \elemtype(\typeof(\result )) == \elemtype(\typeof(this));
ensures java.lang.reflect.Array.getLength(\result ) == java.lang.reflect.Array.getLength(this);
ensures ( \forall int i; 0 <= i&&i < java.lang.reflect.Array.getLength(this); ( \exists java.lang.Object result_i; result_i == java.lang.reflect.Array.get(\result ,i); (result_i == null&&java.lang.reflect.Array.get(this,i) == null)||(result_i != null&&result_i.equals(java.lang.reflect.Array.get(this,i)))));
     also
protected exceptional_behavior
requires !(this instanceof java.lang.Cloneable);
assignable \nothing;
signals_only java.lang.CloneNotSupportedException;
     also
protected normal_behavior
requires \elemtype(\typeof(this)) <: \type(java.lang.Object);
assignable \nothing;
ensures \elemtype(\typeof(\result )) == \elemtype(\typeof(this));
ensures ((java.lang.Object[])\result ).length == ((java.lang.Object[])this).length;
ensures ( \forall int i; 0 <= i&&i < ((java.lang.Object[])this).length; ((java.lang.Object[])\result )[i] == ((java.lang.Object[])this)[i]);
     also
protected normal_behavior
requires \elemtype(\typeof(this)) == \type(int);
assignable \nothing;
ensures \elemtype(\typeof(\result )) == \elemtype(\typeof(this));
ensures ((int[])\result ).length == ((int[])this).length;
ensures ( \forall int i; 0 <= i&&i < ((int[])this).length; ((int[])\result )[i] == ((int[])this)[i]);
     also
protected normal_behavior
requires \elemtype(\typeof(this)) == \type(byte);
assignable \nothing;
ensures \elemtype(\typeof(\result )) == \elemtype(\typeof(this));
ensures ((byte[])\result ).length == ((byte[])this).length;
ensures ( \forall int i; 0 <= i&&i < ((byte[])this).length; ((byte[])\result )[i] == ((byte[])this)[i]);
     also
protected normal_behavior
requires \elemtype(\typeof(this)) == \type(char);
assignable \nothing;
ensures \elemtype(\typeof(\result )) == \elemtype(\typeof(this));
ensures ((char[])\result ).length == ((char[])this).length;
ensures ( \forall int i; 0 <= i&&i < ((char[])this).length; ((char[])\result )[i] == ((char[])this)[i]);
     also
protected normal_behavior
requires \elemtype(\typeof(this)) == \type(long);
assignable \nothing;
ensures \elemtype(\typeof(\result )) == \elemtype(\typeof(this));
ensures ((long[])\result ).length == ((long[])this).length;
ensures ( \forall int i; 0 <= i&&i < ((long[])this).length; ((long[])\result )[i] == ((long[])this)[i]);
     also
protected normal_behavior
requires \elemtype(\typeof(this)) == \type(short);
assignable \nothing;
ensures \elemtype(\typeof(\result )) == \elemtype(\typeof(this));
ensures ((short[])\result ).length == ((short[])this).length;
ensures ( \forall int i; 0 <= i&&i < ((short[])this).length; ((short[])\result )[i] == ((short[])this)[i]);
     also
protected normal_behavior
requires \elemtype(\typeof(this)) == \type(boolean);
assignable \nothing;
ensures \elemtype(\typeof(\result )) == \elemtype(\typeof(this));
ensures ((boolean[])\result ).length == ((boolean[])this).length;
ensures ( \forall int i; 0 <= i&&i < ((boolean[])this).length; ((boolean[])\result )[i] == ((boolean[])this)[i]);
     also
protected normal_behavior
requires \elemtype(\typeof(this)) == \type(float);
assignable \nothing;
ensures \elemtype(\typeof(\result )) == \elemtype(\typeof(this));
ensures ((float[])\result ).length == ((float[])this).length;
ensures ( \forall int i; 0 <= i&&i < ((float[])this).length; (java.lang.Float.isNaN(((float[])\result )[i])&&java.lang.Float.isNaN(((float[])this)[i]))||((float[])\result )[i] == ((float[])this)[i]);
     also
protected normal_behavior
requires \elemtype(\typeof(this)) == \type(double);
assignable \nothing;
ensures \elemtype(\typeof(\result )) == \elemtype(\typeof(this));
ensures ((double[])\result ).length == ((double[])this).length;
ensures ( \forall int i; 0 <= i&&i < ((double[])this).length; (java.lang.Double.isNaN(((double[])\result )[i])&&java.lang.Double.isNaN(((double[])this)[i]))||((double[])\result )[i] == ((double[])this)[i]);
Specifications inherited from overridden method in interface JMLEnumeration:
      --- None ---
Specifications inherited from overridden method in interface JMLObjectType:
       pure
     also
public normal_behavior
ensures \result instanceof org.jmlspecs.models.JMLObjectType;
Specifications inherited from overridden method in interface JMLType:
       pure
     also
public normal_behavior
ensures \result != null;
ensures \result instanceof org.jmlspecs.models.JMLType;
ensures ((org.jmlspecs.models.JMLType)\result ).equals(this);
    implies_that
ensures \result != null&&\typeof(\result ) <: \type(org.jmlspecs.models.JMLType);

equals

public boolean equals(nullable Object oth)
Return true just when this enumerator has the same state as the given argument..

Specified by:
equals in interface JMLType
Overrides:
equals in class Object
Specifications: (inherited)pure
Specifications inherited from overridden method equals(Object obj) in class Object:
       pure
public normal_behavior
requires obj != null;
ensures (* \result is true when obj is "equal to" this object *);
     also
public normal_behavior
requires this == obj;
ensures \result ;
     also
public code normal_behavior
requires obj != null;
ensures \result <==> this == obj;
     also
diverges false;
ensures obj == null ==> !\result ;
Specifications inherited from overridden method equals(Object ob2) in interface JMLObjectType:
       pure
     also
public normal_behavior
ensures \result ==> ob2 != null&&(* ob2 and this contain the same object references *);
Specifications inherited from overridden method equals(Object ob2) in interface JMLType:
       pure
     also
public normal_behavior
ensures \result ==> ob2 != null&&(* ob2 is not distinguishable from this, except by using mutation or == *);
    implies_that
public normal_behavior
{|
requires ob2 != null&&ob2 instanceof org.jmlspecs.models.JMLType;
ensures ((org.jmlspecs.models.JMLType)ob2).equals(this) == \result ;
also
requires ob2 == this;
ensures \result <==> true;
|}

hashCode

public int hashCode()
Return a hash code for this enumerator.

Specified by:
hashCode in interface JMLType
Overrides:
hashCode in class Object
Specifications: (inherited)pure
Specifications inherited from overridden method in class Object:
public behavior
assignable objectState;
ensures (* \result is a hash code for this object *);
     also
public code normal_behavior
assignable \nothing;
Specifications inherited from overridden method in interface JMLType:
       pure

JML

JML is Copyright (C) 1998-2002 by Iowa State University and is distributed under the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This release depends on code from the MultiJava project and is based in part on the Kopi project Copyright (C) 1990-99 DMS Decision Management Systems Ges.m.b.H.