package net.pterodactylus.sone.text;
-import java.io.IOException;
-import java.io.StringWriter;
-import java.io.Writer;
+import java.util.ArrayDeque;
import java.util.ArrayList;
+import java.util.Deque;
+import java.util.Iterator;
import java.util.List;
+import java.util.NoSuchElementException;
/**
* Part implementation that can contain an arbitrary amount of other parts.
*
* @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
*/
-public class PartContainer implements Part {
+public class PartContainer implements Part, Iterable<Part> {
/** The parts to render. */
private final List<Part> parts = new ArrayList<Part>();
}
//
- // PART METHODS
+ // ITERABLE METHODS
//
/**
* {@inheritDoc}
*/
@Override
- public void render(Writer writer) throws IOException {
- for (Part part : parts) {
- part.render(writer);
- }
- }
+ @SuppressWarnings("synthetic-access")
+ public Iterator<Part> iterator() {
+ return new Iterator<Part>() {
- //
- // OBJECT METHODS
- //
+ private Deque<Iterator<Part>> partStack = new ArrayDeque<Iterator<Part>>();
+ private Part nextPart;
+ private boolean foundNextPart;
+ private boolean noNextPart;
- @Override
- public String toString() {
- StringWriter stringWriter = new StringWriter();
- try {
- render(stringWriter);
- } catch (IOException ioe1) {
- /* should never throw, ignore. */
- }
- return stringWriter.toString();
+ {
+ partStack.push(parts.iterator());
+ }
+
+ private void findNext() {
+ if (foundNextPart) {
+ return;
+ }
+ noNextPart = true;
+ while (!partStack.isEmpty()) {
+ Iterator<Part> parts = partStack.pop();
+ if (parts.hasNext()) {
+ nextPart = parts.next();
+ partStack.push(parts);
+ if (nextPart instanceof PartContainer) {
+ partStack.push(((PartContainer) nextPart).iterator());
+ } else {
+ noNextPart = false;
+ break;
+ }
+ }
+ }
+ foundNextPart = true;
+ }
+
+ @Override
+ public boolean hasNext() {
+ findNext();
+ return !noNextPart;
+ }
+
+ @Override
+ public Part next() {
+ findNext();
+ if (noNextPart) {
+ throw new NoSuchElementException();
+ }
+ foundNextPart = false;
+ return nextPart;
+ }
+
+ @Override
+ public void remove() {
+ /* ignore. */
+ }
+
+ };
}
}