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/* Glazed Lists (c) 2003-2006 */
/* http://publicobject.com/glazedlists/ publicobject.com,*/
/* O'Dell Engineering Ltd.*/
package ca.odell.glazedlists.impl.adt;
/**
* A thin wrapper class for Objects to be inserted in the
* age sorted tree representation of the cache.
*
* @author <a href="mailto:kevin@swank.ca">Kevin Maltby</a>
*/
public final class AgedNode {
/** provide times of nodes relative to one-another */
private static long nextTimestamp = 0;
/** The corresponding node in the index tree */
private SparseListNode indexNode = null;
/** The timestamp corresponding to the last access of this node */
private long timestamp = 0;
/** The value to this node */
private Object value = null;
/**
* Creates a new AgedNode object to store in the age sorted tree
*
* @param indexNode The related node in the indexing tree
* @param value The value to assign to this node
*/
public AgedNode(SparseListNode indexNode, Object value) {
this.indexNode = indexNode;
this.value = value;
timestamp = nextTimestamp();
}
private static synchronized final long nextTimestamp() {
return nextTimestamp++;
}
/**
* Retrieves the value of this node.
*
* This is an access, and as such, this node must be re-ordered
*
* @return The value of this node
*/
public Object getValue() {
timestamp = nextTimestamp();
return value;
}
/**
* Retrieves the index node for this node.
*
* @return The index node
*/
public SparseListNode getIndexNode() {
return indexNode;
}
/**
* Retrieves the age of this node.
*
* @return The age of this node
*/
public long getTimestamp() {
return timestamp;
}
@Override
public String toString() {
return "[AgedNode: " + value + "]";
}
}
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