org.apache.cxf.transport.http.ChunkedUtil Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.cxf.transport.http;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
import java.net.HttpURLConnection;
import org.apache.cxf.helpers.HttpHeaderHelper;
final class ChunkedUtil {
private ChunkedUtil() {
}
/**
* Get an input stream containing the partial response if one is present.
*
* @param connection the connection in question
* @param responseCode the response code
* @return an input stream if a partial response is pending on the connection
*/
public static InputStream getPartialResponse(
HttpURLConnection connection,
int responseCode
) throws IOException {
InputStream in = null;
if (responseCode == HttpURLConnection.HTTP_ACCEPTED
|| responseCode == HttpURLConnection.HTTP_OK) {
if (connection.getContentLength() > 0) {
in = connection.getInputStream();
} else if (hasChunkedResponse(connection)
|| hasEofTerminatedResponse(connection)) {
// ensure chunked or EOF-terminated response is non-empty
in = getNonEmptyContent(connection);
}
}
return in;
}
/**
* @param connection the given HttpURLConnection
* @return true iff the connection has a chunked response pending
*/
private static boolean hasChunkedResponse(HttpURLConnection connection) {
return HttpHeaderHelper.CHUNKED.equalsIgnoreCase(
connection.getHeaderField(HttpHeaderHelper.TRANSFER_ENCODING));
}
/**
* @param connection the given HttpURLConnection
* @return true iff the connection has a chunked response pending
*/
private static boolean hasEofTerminatedResponse(
HttpURLConnection connection
) {
return HttpHeaderHelper.CLOSE.equalsIgnoreCase(
connection.getHeaderField(HttpHeaderHelper.CONNECTION));
}
/**
* @param connection the given HttpURLConnection
* @return an input stream containing the response content if non-empty
*/
private static InputStream getNonEmptyContent(
HttpURLConnection connection
) {
InputStream in = null;
try {
@SuppressWarnings("resource")
PushbackInputStream pin =
new PushbackInputStream(connection.getInputStream());
int c = pin.read();
if (c != -1) {
pin.unread((byte)c);
in = pin;
}
} catch (IOException ioe) {
// ignore
}
return in;
}
}