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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.toolbox;
import androidx.annotation.GuardedBy;
import androidx.annotation.Nullable;
import com.android.volley.NetworkResponse;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.Response.ErrorListener;
import com.android.volley.Response.Listener;
import java.io.UnsupportedEncodingException;
/** A canned request for retrieving the response body at a given URL as a String. */
public class StringRequest extends Request<String> {
/** Lock to guard mListener as it is cleared on cancel() and read on delivery. */
private final Object mLock = new Object();
@Nullable
@GuardedBy("mLock")
private Listener<String> mListener;
/**
* Creates a new request with the given method.
*
* @param method the request {@link Method} to use
* @param url URL to fetch the string at
* @param listener Listener to receive the String response
* @param errorListener Error listener, or null to ignore errors
*/
public StringRequest(
int method,
String url,
Listener<String> listener,
@Nullable ErrorListener errorListener) {
super(method, url, errorListener);
mListener = listener;
}
/**
* Creates a new GET request.
*
* @param url URL to fetch the string at
* @param listener Listener to receive the String response
* @param errorListener Error listener, or null to ignore errors
*/
public StringRequest(
String url, Listener<String> listener, @Nullable ErrorListener errorListener) {
this(Method.GET, url, listener, errorListener);
}
@Override
public void cancel() {
super.cancel();
synchronized (mLock) {
mListener = null;
}
}
@Override
protected void deliverResponse(String response) {
Response.Listener<String> listener;
synchronized (mLock) {
listener = mListener;
}
if (listener != null) {
listener.onResponse(response);
}
}
@Override
@SuppressWarnings("DefaultCharset")
protected Response<String> parseNetworkResponse(NetworkResponse response) {
String parsed;
try {
parsed = new String(response.data, HttpHeaderParser.parseCharset(response.headers));
} catch (UnsupportedEncodingException e) {
// Since minSdkVersion = 8, we can't call
// new String(response.data, Charset.defaultCharset())
// So suppress the warning instead.
parsed = new String(response.data);
}
return Response.success(parsed, HttpHeaderParser.parseCacheHeaders(response));
}
}
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