unboundedenv.html

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<TD><B>Methods inherited from class java.lang.Object</B></TD>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</CODE></TD>
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<B>Constructor Detail</B></FONT></TD>
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<A NAME="UnboundedEnv()"><!-- --></A><H3>
UnboundedEnv</H3>
<PRE>
public <B>UnboundedEnv</B>()</PRE>
<DL>
<DD>Constructs an empty UnboundedEnv object.</DL>

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<B>Method Detail</B></FONT></TD>
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<A NAME="numRows()"><!-- --></A><H3>
numRows</H3>
<PRE>
public int <B>numRows</B>()</PRE>
<DL>
<DD>Returns number of rows in this environment.<DD><DL>
<DT><B>Returns:</B><DD>the number of rows, or -1 if the environment is unbounded</DL>
</DD>
</DL>
<HR>

<A NAME="numCols()"><!-- --></A><H3>
numCols</H3>
<PRE>
public int <B>numCols</B>()</PRE>
<DL>
<DD>Returns number of columns in this environment.<DD><DL>
<DT><B>Returns:</B><DD>the number of columns, or -1 if the environment is unbounded</DL>
</DD>
</DL>
<HR>

<A NAME="isValid(Location)"><!-- --></A><H3>
isValid</H3>
<PRE>
public boolean <B>isValid</B>(<A HREF="Location.html">Location</A>&nbsp;loc)</PRE>
<DL>
<DD>Verifies whether a location is valid in this environment.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>loc</CODE> - location to check<DT><B>Returns:</B><DD><code>true</code> if <code>loc</code> is valid;
          <code>false</code> otherwise</DL>
</DD>
</DL>
<HR>

<A NAME="numObjects()"><!-- --></A><H3>
numObjects</H3>
<PRE>
public int <B>numObjects</B>()</PRE>
<DL>
<DD>Returns the number of objects in this environment.<DD><DL>
<DT><B>Returns:</B><DD>the number of objects</DL>
</DD>
</DL>
<HR>

<A NAME="allObjects()"><!-- --></A><H3>
allObjects</H3>
<PRE>
public <A HREF="Locatable.html">Locatable</A>[] <B>allObjects</B>()</PRE>
<DL>
<DD>Returns all the objects in this environment.<DD><DL>
<DT><B>Returns:</B><DD>an array of all the environment objects</DL>
</DD>
</DL>
<HR>

<A NAME="isEmpty(Location)"><!-- --></A><H3>
isEmpty</H3>
<PRE>
public boolean <B>isEmpty</B>(<A HREF="Location.html">Location</A>&nbsp;loc)</PRE>
<DL>
<DD>Determines whether a specific location in this environment is
  empty.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>loc</CODE> - the location to test<DT><B>Returns:</B><DD><code>true</code> if <code>loc</code> is a
              valid location in the context of this environment
              and is empty; <code>false</code> otherwise</DL>
</DD>
</DL>
<HR>

<A NAME="objectAt(Location)"><!-- --></A><H3>
objectAt</H3>
<PRE>
public <A HREF="Locatable.html">Locatable</A> <B>objectAt</B>(<A HREF="Location.html">Location</A>&nbsp;loc)</PRE>
<DL>
<DD>Returns the object at a specific location in this environment.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>loc</CODE> - the location in which to look<DT><B>Returns:</B><DD>the object at location <code>loc</code>;
                <code>null</code> if <code>loc</code> is empty</DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>Creates a single string representing all the objects in this
  environment (not necessarily in any particular order).<DD><DL>
<DT><B>Overrides:</B><DD><CODE>toString</CODE> in class <CODE>java.lang.Object</CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>a string indicating all the objects in this environment</DL>
</DD>
</DL>
<HR>

<A NAME="add(Locatable)"><!-- --></A><H3>
add</H3>
<PRE>
public void <B>add</B>(<A HREF="Locatable.html">Locatable</A>&nbsp;obj)</PRE>
<DL>
<DD>Adds a new object to this environment at the location it specifies.
  (Precondition: <code>obj.location()</code> is a valid empty location.)<DD><DL>
<DT><B>Parameters:</B><DD><CODE>obj</CODE> - the new object to be added<DT><B>Throws:</B><DD><CODE>java.lang.IllegalArgumentException</CODE> - if the precondition is not met</DL>
</DD>
</DL>
<HR>

<A NAME="remove(Locatable)"><!-- --></A><H3>
remove</H3>
<PRE>
public void <B>remove</B>(<A HREF="Locatable.html">Locatable</A>&nbsp;obj)</PRE>
<DL>
<DD>Removes the object from this environment.
  (Precondition: <code>obj</code> is in this environment.)<DD><DL>
<DT><B>Parameters:</B><DD><CODE>obj</CODE> - the object to be removed<DT><B>Throws:</B><DD><CODE>java.lang.IllegalArgumentException</CODE> - if the precondition is not met</DL>
</DD>
</DL>
<HR>

<A NAME="recordMove(Locatable, Location)"><!-- --></A><H3>
recordMove</H3>
<PRE>
public void <B>recordMove</B>(<A HREF="Locatable.html">Locatable</A>&nbsp;obj,
                       <A HREF="Location.html">Location</A>&nbsp;oldLoc)</PRE>
<DL>
<DD>Updates this environment to reflect the fact that an object moved.
  (Precondition: <code>obj.location()</code> is a valid location
  and there is no other object there.
  Postcondition: <code>obj</code> is at the appropriate location
  (<code>obj.location()</code>), and either <code>oldLoc</code> is 
  equal to <code>obj.location()</code> (there was no movement) or
  <code>oldLoc</code> is empty.)<DD><DL>
<DT><B>Parameters:</B><DD><CODE>obj</CODE> - the object that moved<DD><CODE>oldLoc</CODE> - the previous location of <code>obj</code><DT><B>Throws:</B><DD><CODE>java.lang.IllegalArgumentException</CODE> - if the precondition is not met</DL>
</DD>
</DL>
<HR>

<A NAME="indexOf(Location)"><!-- --></A><H3>
indexOf</H3>
<PRE>
protected int <B>indexOf</B>(<A HREF="Location.html">Location</A>&nbsp;loc)</PRE>
<DL>
<DD>Get the index of the object at the specified location.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>loc</CODE> - the location in which to look<DT><B>Returns:</B><DD>the index of the object at location <code>loc</code>
                if there is one; -1 otherwise</DL>
</DD>
</DL>
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