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/******************************************************************************
* Copyright (c) 2011 GitHub Inc.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Kevin Sawicki (GitHub Inc.) - initial API and implementation
*****************************************************************************/
package org.eclipse.egit.github.core.client;
import static org.eclipse.egit.github.core.client.IGitHubConstants.PARAM_PAGE;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.eclipse.egit.github.core.IResourceProvider;
import org.eclipse.egit.github.core.util.UrlUtils;
/**
* Iterator for getting paged responses. Each call to {@link #next()} will make
* a client request for the next page of resources using the URI returned from
* the previous request.
*
* The {@link #hasNext()} method can be used to determine if the last executed
* request contained the location of the next page of results.
*
* This iterator also provides the next and last page numbers as well as the
* next and last URIs.
*
* @param <V>
* type of resource being iterated over
*/
public class PageIterator<V> implements Iterator<Collection<V>>,
Iterable<Collection<V>> {
/**
* Request
*/
protected final PagedRequest<V> request;
/**
* Client
*/
protected final GitHubClient client;
/**
* Current page number
*/
protected int nextPage;
/**
* Last page number
*/
protected int lastPage;
/**
* Next uri to be fetched
*/
protected String next;
/**
* Last uri to be fetched
*/
protected String last;
/**
* Create page iterator
*
* @param request
* @param client
*/
public PageIterator(PagedRequest<V> request, GitHubClient client) {
this.request = request;
this.client = client;
next = request.getUri();
nextPage = parsePageNumber(next);
}
/**
* Parse page number from uri
*
* @param uri
* @return page number
*/
protected int parsePageNumber(String uri) {
if (uri == null || uri.length() == 0)
return -1;
final URI parsed;
try {
parsed = new URI(uri);
} catch (URISyntaxException e) {
return -1;
}
final String param = UrlUtils.getParam(parsed, PARAM_PAGE);
if (param == null || param.length() == 0)
return -1;
try {
return Integer.parseInt(param);
} catch (NumberFormatException nfe) {
return -1;
}
}
/**
* Get number of next page to be read
*
* @return next page
*/
public int getNextPage() {
return nextPage;
}
/**
* Get number of last page
*
* @return page number
*/
public int getLastPage() {
return lastPage;
}
/**
* Get URI of next request
*
* @return next page uri
*/
public String getNextUri() {
return next;
}
/**
* Get uri of last page
*
* @return last page uri
*/
public String getLastUri() {
return last;
}
public boolean hasNext() {
return nextPage == 0 || next != null;
}
public void remove() {
throw new UnsupportedOperationException("Remove not supported"); //$NON-NLS-1$
}
@SuppressWarnings("unchecked")
public Collection<V> next() {
if (!hasNext())
throw new NoSuchElementException();
if (next != null)
if (nextPage < 1)
request.setUri(next);
else
try {
request.setUri(new URL(next).getFile());
} catch (MalformedURLException e) {
request.setUri(next);
}
GitHubResponse response;
try {
response = client.get(request);
} catch (IOException e) {
throw new NoSuchPageException(e);
}
Collection<V> resources = null;
Object body = response.getBody();
if (body != null)
if (body instanceof Collection)
resources = (Collection<V>) body;
else if (body instanceof IResourceProvider)
resources = ((IResourceProvider<V>) body).getResources();
else
resources = (Collection<V>) Collections.singletonList(body);
if (resources == null)
resources = Collections.emptyList();
nextPage++;
next = response.getNext();
nextPage = parsePageNumber(next);
last = response.getLast();
lastPage = parsePageNumber(last);
return resources;
}
/**
* Get request being executed
*
* @return request
*/
public PagedRequest<V> getRequest() {
return request;
}
/**
* @return this page iterator
*/
public Iterator<Collection<V>> iterator() {
return this;
}
}
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