com.sun.jersey.server.impl.uri.rules.automata.TrieNodeValue Maven / Gradle / Ivy
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/*
* TrieNodeValue.java
*
* Created on November 18, 2007, 11:57 AM
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
package com.sun.jersey.server.impl.uri.rules.automata;
import java.util.Arrays;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
*
* @author mnesarco
*/
public class TrieNodeValue {
private Object value = null;
/** Creates a new instance of TrieNodeValue */
public TrieNodeValue() {
}
public void set(T value) {
if (this.value == null) {
this.value = value;
}
else if (this.value.getClass().isArray()) {
Object[] old = (Object[])this.value;
Object[] copy = new Object[old.length+1];
System.arraycopy(old, 0, copy, 0, old.length+1);
copy[copy.length-1] = value;
this.value = copy;
}
else {
this.value = new Object[] { this.value, value };
}
}
@SuppressWarnings("unchecked")
public Iterator getIterator() {
if (this.value == null) {
return new EmptyIterator();
}
else if (this.value.getClass().isArray()) {
return new ArrayIterator((Object[])this.value);
}
else {
return new SingleEntryIterator((T)this.value);
}
}
public boolean isEmpty() {
return value == null;
}
private static final class ArrayIterator implements Iterator {
private Object[] data;
private int cursor = 0;
public ArrayIterator(Object[] data) {
this.data = data;
}
public boolean hasNext() {
return cursor < data.length;
}
@SuppressWarnings("unchecked")
public T next() {
if (hasNext()) {
return (T)data[cursor++];
}
else {
throw new NoSuchElementException();
}
}
public void remove() {
throw new UnsupportedOperationException();
}
}
private static final class SingleEntryIterator implements Iterator {
private T t;
SingleEntryIterator(T t) {
this.t = t;
}
public boolean hasNext() {
return t != null;
}
public T next() {
if (hasNext()) {
final T _t = t;
t = null;
return _t;
} else {
throw new NoSuchElementException();
}
}
public void remove() {
throw new UnsupportedOperationException();
}
}
static final class EmptyIterator implements Iterator {
public boolean hasNext() {
return false;
}
public T next() {
throw new NoSuchElementException();
}
public void remove() {
throw new UnsupportedOperationException();
}
}
}