element.html

发布/订阅系统路由重配算法,可应用于ad hoc环境

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<A NAME="properties"><!-- --></A><H3>
properties</H3>
<PRE>
protected <A HREF="../util/SimpleHashtable.html" title="class in util">SimpleHashtable</A> <B>properties</B></PRE>
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<DD>A hashtable to store property to value mappings.
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<A NAME="Element()"><!-- --></A><H3>
Element</H3>
<PRE>
public <B>Element</B>()</PRE>
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<DD>Constructs a new element with an unique ID and without any
 attached properties.
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<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</B>(java.lang.Object&nbsp;o)</PRE>
<DL>
<DD>Compares this element to the specified object.
 The result is <code>true</code> if and only if the object 
 <code>o<code> is not <code>null</code> and is also an element
 with the same id.
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<DD><DL>
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</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>o</CODE> - the object to compare to.
<DT><B>Returns:</B><DD><code>true</code> if the specified object is not 
         <code>null</code> and is also an element with the same id.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>o</code> is <code>null</code>.</DL>
</DD>
</DL>
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<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public int <B>hashCode</B>()</PRE>
<DL>
<DD>Returns a hash code for this <code>element</code> based on its id.
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<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>a hash code value for this <code>element</code>, equal to
         its <code>ID</code>s hash code.</DL>
</DD>
</DL>
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<A NAME="setProperty(graph.Property, java.lang.Object)"><!-- --></A><H3>
setProperty</H3>
<PRE>
public java.lang.Object <B>setProperty</B>(<A HREF="../graph/Property.html" title="class in graph">Property</A>&nbsp;property,
                                    java.lang.Object&nbsp;value)</PRE>
<DL>
<DD>Attaches a <code>property</code> to <code>value</code> mapping 
 to this element.
 The property can not be <code>null<code>. <p>
  
 Use the <code>getProperty</code> method with an equal key 
 to retrieve the mapped value again.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>property</CODE> - the property.<DD><CODE>value</CODE> - the belonging value.
<DT><B>Returns:</B><DD>the previous value of the specified property or 
         <code>null</code> if the property was not attached before.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if property is <code>null<code>.<DT><B>See Also:</B><DD><A HREF="../graph/Element.html#getProperty(graph.Property)"><CODE>getProperty(Property)</CODE></A></DL>
</DD>
</DL>
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<A NAME="getProperty(graph.Property)"><!-- --></A><H3>
getProperty</H3>
<PRE>
public java.lang.Object <B>getProperty</B>(<A HREF="../graph/Property.html" title="class in graph">Property</A>&nbsp;property)</PRE>
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<DD>Retrives the value the attached property is mapped to.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>property</CODE> - an attached property.
<DT><B>Returns:</B><DD>the value to which the property is mapped or <code>null</code>
         if the property is not attached to this element.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if property is <code>null<code>.<DT><B>See Also:</B><DD><CODE>#setProperty(Property)</CODE></DL>
</DD>
</DL>
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<A NAME="hasProperty(graph.Property)"><!-- --></A><H3>
hasProperty</H3>
<PRE>
public boolean <B>hasProperty</B>(<A HREF="../graph/Property.html" title="class in graph">Property</A>&nbsp;property)</PRE>
<DL>
<DD>Tests whether the element has a value mapped by that property.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>property</CODE> - the property.
<DT><B>Returns:</B><DD>true if a value is attached for this property.</DL>
</DD>
</DL>
<HR>

<A NAME="removeProperty(graph.Property)"><!-- --></A><H3>
removeProperty</H3>
<PRE>
public java.lang.Object <B>removeProperty</B>(<A HREF="../graph/Property.html" title="class in graph">Property</A>&nbsp;property)</PRE>
<DL>
<DD>Removes the property (and its corresponding value) from this element.
 This method does nothing if the property is not attached to this
 element.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>property</CODE> - an attached property.
<DT><B>Returns:</B><DD>the value to which the property was mapped or <code>null</code>
         if the property is not attached to this element.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if property is <code>null<code>.</DL>
</DD>
</DL>
<HR>

<A NAME="compareTo(java.lang.Object)"><!-- --></A><H3>
compareTo</H3>
<PRE>
public int <B>compareTo</B>(java.lang.Object&nbsp;o)</PRE>
<DL>
<DD>Compares this <code>Element</code> object to another object.
 The elements ordering is inherited from its ids.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>compareTo</CODE> in interface <CODE>java.lang.Comparable</CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>o</CODE> - the object to compare to.
<DT><B>Returns:</B><DD><code>0</code> if both elements are equal,
         a value less than <code>0</code> if this element is less 
         than the argument and 
         a value greater than <code>0</code> if this element is greater 
         than the argument.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if the argument is <code>null</code>.
<DD><CODE>java.lang.ClassCastException</CODE> - if the argument is not an 
         <code>Element</code>.</DL>
</DD>
</DL>
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