org.glassfish.jersey.server.internal.scanning.ResourceFinderStack Maven / Gradle / Ivy
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package org.glassfish.jersey.server.internal.scanning;
import java.io.InputStream;
import java.util.Deque;
import java.util.LinkedList;
import java.util.NoSuchElementException;
import java.util.Stack;
import org.glassfish.jersey.server.ResourceFinder;
/**
* {@link Stack} of {@link ResourceFinder} instances.
*
* Used to combine various finders into one instance.
*
* @author Pavel Bucek (pavel.bucek at oracle.com)
*/
public class ResourceFinderStack implements ResourceFinder {
private final Deque stack = new LinkedList ();
private ResourceFinder current = null;
@Override
public boolean hasNext() {
if(current == null) {
if(!stack.isEmpty()) {
current = stack.pop();
} else {
return false;
}
}
if(current.hasNext()) {
return true;
} else {
if(!stack.isEmpty()) {
current = stack.pop();
return hasNext();
} else {
return false;
}
}
}
@Override
public String next() {
if(hasNext()) {
return current.next();
}
throw new NoSuchElementException();
}
@Override
public void remove() {
current.remove();
}
@Override
public InputStream open() {
return current.open();
}
public void push(ResourceFinder iterator) {
stack.push(iterator);
}
@Override
public void reset() {
throw new UnsupportedOperationException();
}
}