io.netty.example.http2.Http2ExampleUtil Maven / Gradle / Ivy
/*
* Copyright 2014 The Netty Project
*
* The Netty Project 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 io.netty.example.http2;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.handler.codec.http.QueryStringDecoder;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
/**
* Utility methods used by the example client and server.
*/
public final class Http2ExampleUtil {
/**
* Response header sent in response to the http->http2 cleartext upgrade request.
*/
public static final String UPGRADE_RESPONSE_HEADER = "http-to-http2-upgrade";
/**
* Size of the block to be read from the input stream.
*/
private static final int BLOCK_SIZE = 1024;
private Http2ExampleUtil() { }
/**
* @param string the string to be converted to an integer.
* @param defaultValue the default value
* @return the integer value of a string or the default value, if the string is either null or empty.
*/
public static int toInt(String string, int defaultValue) {
if (string != null && !string.isEmpty()) {
return Integer.parseInt(string);
}
return defaultValue;
}
/**
* Reads an InputStream into a byte array.
* @param input the InputStream.
* @return a byte array representation of the InputStream.
* @throws IOException if an I/O exception of some sort happens while reading the InputStream.
*/
public static ByteBuf toByteBuf(InputStream input) throws IOException {
ByteBuf buf = Unpooled.buffer();
int n = 0;
do {
n = buf.writeBytes(input, BLOCK_SIZE);
} while (n > 0);
return buf;
}
/**
* @param query the decoder of query string
* @param key the key to lookup
* @return the first occurrence of that key in the string parameters
*/
public static String firstValue(QueryStringDecoder query, String key) {
checkNotNull(query, "Query can't be null!");
List values = query.parameters().get(key);
if (values == null || values.isEmpty()) {
return null;
}
return values.get(0);
}
}