org.coweb.oe.ContextVector Maven / Gradle / Ivy
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package org.coweb.oe;
import java.util.HashMap;
import java.util.Map;
import java.util.Arrays;
public class ContextVector {
private int[] sites;
public ContextVector(Map args) throws OperationEngineException {
if(args.containsKey("count")) {
this.sites = new int[((Integer)args.get("count")).intValue()];
}
else if(args.containsKey("contextVector")) {
this.sites = ((ContextVector)args.get("contextVector")).copySites();
}
else if(args.containsKey("sites")) {
int[] s = (int[])args.get("sites");
this.sites = Arrays.copyOf(s, s.length);
}
else if(args.containsKey("state")) {
this.sites = (int[])args.get("state");
}
else {
throw new OperationEngineException("uninitialized context vector");
}
}
/**
* Converts the contents of this context vector sites array to a string.
*
* @return All integers in the vector (for debug)
*/
@Override
public String toString() {
StringBuffer b = new StringBuffer();
b.append(Arrays.toString(this.sites));
return b.toString();
}
/**
* Serializes this context vector.
*
* @return Array of integer sequence numbers
*/
public int[] getState() {
return this.sites;
}
/**
* Makes an independent copy of this context vector.
* @throws OperationEngineException
*
* @return Copy of this context vector
*/
public ContextVector copy() throws OperationEngineException {
HashMap args = new HashMap();
args.put("contextVector", this);
return new ContextVector(args);
}
/**
* Makes an independent copy of the array in this context vector.
*
* @return Copy of this context vector's sites array
*/
public int[] copySites() {
return Arrays.copyOf(this.sites, this.sites.length);
}
/**
* Computes the difference in sequence numbers at each site between this
* context vector and the one provided.
*
* @param cv Other context vector object
* @return Represents the difference between this vector and the one passed
*/
public ContextDifference subtract(ContextVector cv) {
ContextDifference cd = new ContextDifference();
for(int i=0; i < this.sites.length; i++) {
int a = this.getSeqForSite(i);
int b = cv.getSeqForSite(i);
if(a-b > 0) {
cd.addRange(i, b+1, a+1);
}
}
return cd;
}
/**
* Finds the oldest sequence number in the difference in sequence numbers
* for each site between this context and the one provided.
*
* @param cv Other context vector object
* @return Represents the oldest difference for each
* site between this vector and the one passed
*/
public ContextDifference oldestDifference(ContextVector cv) {
ContextDifference cd = new ContextDifference();
for(int i=0; i < this.sites.length; i++) {
int a = this.getSeqForSite(i);
int b = cv.getSeqForSite(i);
if(a-b > 0) {
cd.addSiteSeq(i, b+1);
}
}
return cd;
}
/**
* Increases the size of the context vector to the given size. Initializes
* new entries with zeros.
*
* @param count Desired integer size of the vector
*/
public void growTo(int count) {
//System.out.println("growTo before new count = " + count + " old array = " + this.toString());
int[] newSites = new int[count];
System.arraycopy(this.sites, 0, newSites, 0, this.sites.length);
for(int i=this.sites.length; i