/*
* Copyright 2015 Nicolas Morel
*
* 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.github.nmorel.gwtjackson.rest.api;
import com.github.nmorel.gwtjackson.client.ObjectReader;
import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.Response;
/**
* @author Nicolas Morel
*/
class RestRequestCallback<R> implements RequestCallback {
private final ObjectReader<R> responseConverter;
private final RestCallback<R> callback;
RestRequestCallback(ObjectReader<R> responseConverter, RestCallback<R> callback) {
this.responseConverter = responseConverter;
this.callback = callback;
}
@Override
public void onResponseReceived(Request request, Response response) {
if (isSuccessStatusCode(response)) {
if (null != callback) {
R result;
if (null != responseConverter && null != response.getText() && !response.getText().isEmpty()) {
try {
result = responseConverter.read(response.getText());
} catch (Exception e) {
onError(request, e);
return;
}
} else {
result = null;
}
callback.onSuccess(response, result);
}
} else {
if (null != callback) {
callback.onError(response);
} else {
throw new RestException("An error occured. Status : " + response.getStatusCode());
}
}
}
private boolean isSuccessStatusCode(Response response) {
int statusCode = response.getStatusCode();
return (statusCode >= 200 && statusCode < 300) || statusCode == 304;
}
@Override
public void onError(Request request, Throwable exception) {
if (null == callback) {
throw new RestException(exception);
} else {
callback.onFailure(exception);
}
}
}