/*
* Copyright (C) 2012 Jason Gedge <http://www.gedge.ca>
*
* This file is part of the OpGraph project.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package ca.gedge.opgraph.library.handlers;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import ca.gedge.opgraph.library.NodeData;
/**
* A handler that handles URIs with everything <code>null</code> except for
* the fragment part. This is achieved by storing a fixed set of node info
* instances.
*
* @see URI
*/
public class SchemelessHandler implements URIHandler<List<NodeData>> {
/** The fixed set of items */
private HashMap<String, NodeData> items = new HashMap<String, NodeData>();
/**
* Associate the fragment component of a given info's URI with the info.
*
* @param info the info
*
* @throws NullPointerException if the given info instance is <code>null</code>
* @throws NullPointerException if the given info's uri has a <code>null</code> fragment
*/
public void put(NodeData info) {
if(info == null)
throw new NullPointerException("Given info cannot be null");
if(info.uri == null || info.uri.getFragment() == null)
throw new NullPointerException("Given uri has a null fragment component");
items.put(info.uri.getFragment(), info);
}
//
// URIHandler<List<NodeData>>
//
@Override
public boolean handlesURI(URI uri) {
if(uri != null && (uri.getScheme() == null || uri.getScheme().trim().length() == 0))
return items.containsKey(uri.getFragment());
return false;
}
@Override
public List<NodeData> load(URI uri) throws IOException {
// Make sure we can handle URI
if(!handlesURI(uri))
throw new IllegalArgumentException("Cannot handle uri '" + uri + "'");
ArrayList<NodeData> ret = new ArrayList<NodeData>();
ret.add(items.get(uri.getFragment()));
return ret;
}
}