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rajender |
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/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.volley;
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/**
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* Encapsulates a parsed response for delivery.
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*
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* @param <T> Parsed type of this response
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*/
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public class Response<T> {
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/** Callback interface for delivering parsed responses. */
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public interface Listener<T> {
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/** Called when a response is received. */
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void onResponse(T response);
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}
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/** Callback interface for delivering error responses. */
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public interface ErrorListener {
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/**
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* Callback method that an error has been occurred with the
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* provided error code and optional user-readable message.
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*/
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void onErrorResponse(VolleyError error);
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}
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/** Returns a successful response containing the parsed result. */
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public static <T> Response<T> success(T result, Cache.Entry cacheEntry) {
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return new Response<T>(result, cacheEntry);
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}
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/**
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* Returns a failed response containing the given error code and an optional
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* localized message displayed to the user.
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*/
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public static <T> Response<T> error(VolleyError error) {
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return new Response<T>(error);
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}
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/** Parsed response, or null in the case of error. */
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public final T result;
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/** Cache metadata for this response, or null in the case of error. */
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public final Cache.Entry cacheEntry;
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/** Detailed error information if <code>errorCode != OK</code>. */
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public final VolleyError error;
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/** True if this response was a soft-expired one and a second one MAY be coming. */
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public boolean intermediate = false;
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/**
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* Returns whether this response is considered successful.
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*/
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public boolean isSuccess() {
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return error == null;
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}
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private Response(T result, Cache.Entry cacheEntry) {
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this.result = result;
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this.cacheEntry = cacheEntry;
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this.error = null;
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}
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private Response(VolleyError error) {
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this.result = null;
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this.cacheEntry = null;
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this.error = error;
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}
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}
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