/* Copyright (c) 2006 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 sample.gbase.cmdline;
import com.google.api.gbase.client.FeedURLFactory;
import com.google.api.gbase.client.GoogleBaseService;
import com.google.api.gbase.client.ServiceError;
import com.google.api.gbase.client.ServiceErrors;
import com.google.gdata.util.ServiceException;
import java.io.IOException;
/**
* Utility class that allows creating simple Example Tools.
*
* Contains methods for parsing the arguments and for printing errors.
*/
public abstract class Example {
protected static FeedURLFactory urlFactory = FeedURLFactory.getDefault();
protected static GoogleBaseService service;
/**
* Parses the arguments, creates a FeedURLFactory and a GoogleBaseService.
* @return the remaining arguments
*/
public static String[] init(String[] args, String applicationName)
throws IOException {
String baseUrl = null;
int argsIndex = 0;
while (argsIndex < args.length && args[argsIndex].startsWith("-")) {
String arg = args[argsIndex];
argsIndex++;
if ( argsIndex >= args.length) {
throw new IllegalArgumentException("Expected a parameter value " +
"after " + arg);
}
String value = args[argsIndex];
argsIndex++;
if ("--url".equals(arg)) {
baseUrl = value;
} else if("--key".equals(arg)) {
// This parameter used to contain the developer key.
// It is still accepted so as not to break scripts that used it, but
// it is now ignored.
} else {
throw new IllegalArgumentException("unknown parameter: " + arg);
}
}
if(baseUrl != null) {
urlFactory = new FeedURLFactory(baseUrl);
}
// service.query does a GET on the url above and parses the result,
// which is an ATOM feed with some extensions (called the Google Base
// data API items feed).
service = new GoogleBaseService(applicationName);
if (argsIndex > 0) {
String[] newargs = new String[args.length - argsIndex];
System.arraycopy(args, argsIndex, newargs, 0, newargs.length);
args = newargs;
}
return args;
}
/**
* Prints an error message returned by the server, if any.
*
* @param e an exception that may contain an error message from the server
*/
protected static void printServiceException(ServiceException e) {
System.err.print("Error");
if (e.getHttpErrorCodeOverride() > 0) {
System.err.print(e.getHttpErrorCodeOverride());
}
System.err.print(": ");
System.err.println(e.getMessage());
ServiceErrors errors = new ServiceErrors(e);
for (ServiceError error: errors.getAllErrors()) {
String field = error.getField();
System.err.print(" ");
if (field != null) {
System.err.print("in field '");
System.err.print(field);
System.err.print("' ");
}
System.err.println(error.getReason());
}
}
}