package is2.data;
/**
* @author Dr. Bernd Bohnet, 17.01.2011
*
* Dynamic phrase structure tree.
*/
public class DPSTree {
private int size = 0;
public int[] heads;
public int[] labels;
public DPSTree() {
this(30);
}
public DPSTree(int initialCapacity) {
heads = new int[initialCapacity];
labels = new int[initialCapacity];
}
/**
* Increases the capacity of this <tt>Graph</tt> instance, if necessary, to
* ensure that it can hold at least the number of nodes specified by the
* minimum capacity argument.
*
* @param minCapacity the desired minimum capacity.
*/
private void ensureCapacity(int minCapacity) {
if (minCapacity > heads.length) {
int newCapacity = minCapacity + 1;
if (newCapacity < minCapacity) {
newCapacity = minCapacity;
}
int oldIndex[] = heads;
heads = new int[newCapacity];
System.arraycopy(oldIndex, 0, heads, 0, oldIndex.length);
oldIndex = labels;
labels = new int[newCapacity];
System.arraycopy(oldIndex, 0, labels, 0, oldIndex.length);
}
}
final public int size() {
return size;
}
final public boolean isEmpty() {
return size == 0;
}
final public void clear() {
size = 0;
}
final public void createTerminals(int terminals) {
ensureCapacity(terminals + 1);
size = terminals + 1;
}
final public int create(int phrase) {
ensureCapacity(size + 1);
labels[size] = phrase;
size++;
return size - 1;
}
public int create(int phrase, int nodeId) {
if (nodeId < 0) {
return this.create(phrase);
}
// DB.println("create phrase "+nodeId+" label "+phrase);
ensureCapacity(nodeId + 1);
labels[nodeId] = phrase;
if (size < nodeId) {
size = nodeId + 1;
}
return nodeId;
}
public void createEdge(int i, int j) {
heads[i] = j;
// DB.println("create edge "+i+"\t "+j);
}
@Override
public DPSTree clone() {
DPSTree ps = new DPSTree(this.size + 1);
for (int k = 0; k < size; k++) {
ps.heads[k] = heads[k];
ps.labels[k] = labels[k];
}
ps.size = size;
return ps;
}
}