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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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.android.volley;
import androidx.annotation.Nullable;
/**
* Encapsulates a parsed response for delivery.
*
* @param <T> Parsed type of this response
*/
public class Response<T> {
/** Callback interface for delivering parsed responses. */
public interface Listener<T> {
/** Called when a response is received. */
void onResponse(T response);
}
/** Callback interface for delivering error responses. */
public interface ErrorListener {
/**
* Callback method that an error has been occurred with the provided error code and optional
* user-readable message.
*/
void onErrorResponse(VolleyError error);
}
/** Returns a successful response containing the parsed result. */
public static <T> Response<T> success(@Nullable T result, @Nullable Cache.Entry cacheEntry) {
return new Response<>(result, cacheEntry);
}
/**
* Returns a failed response containing the given error code and an optional localized message
* displayed to the user.
*/
public static <T> Response<T> error(VolleyError error) {
return new Response<>(error);
}
/** Parsed response, can be null; always null in the case of error. */
@Nullable public final T result;
/** Cache metadata for this response; null if not cached or in the case of error. */
@Nullable public final Cache.Entry cacheEntry;
/** Detailed error information if <code>errorCode != OK</code>. */
@Nullable public final VolleyError error;
/** True if this response was a soft-expired one and a second one MAY be coming. */
public boolean intermediate = false;
/** Returns whether this response is considered successful. */
public boolean isSuccess() {
return error == null;
}
private Response(@Nullable T result, @Nullable Cache.Entry cacheEntry) {
this.result = result;
this.cacheEntry = cacheEntry;
this.error = null;
}
private Response(VolleyError error) {
this.result = null;
this.cacheEntry = null;
this.error = error;
}
}
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