/**
* Copyright 2010 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package com.google.code.samples.apps.marketplace.openid;
import com.google.step2.discovery.HostMeta;
import com.google.step2.discovery.HostMetaException;
import com.google.step2.discovery.HostMetaFetcher;
/**
* Simple fetcher to serially try different host-meta fetching strategies, returning the
* first one to find data.
*/
public class SerialHostMetaFetcher implements com.google.step2.discovery.HostMetaFetcher {
HostMetaFetcher[] fetchers;
public SerialHostMetaFetcher(HostMetaFetcher ...fetchers) {
this.fetchers = fetchers;
}
public HostMeta getHostMeta(String domain) throws HostMetaException {
for (int i = 0; i < fetchers.length; ++i) {
HostMeta info = fetchers[i].getHostMeta(domain);
if (isValidHostMeta(info)) {
return info;
}
}
return null;
}
protected boolean isValidHostMeta(HostMeta info) {
if (info != null && !info.getLinks().isEmpty()) {
return true;
} else {
return false;
}
}
}