/*
* ====================================================================
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.ogt.http.conn.scheme;
import java.util.Locale;
import org.apache.ogt.http.annotation.Immutable;
import org.apache.ogt.http.util.LangUtils;
/**
* Encapsulates specifics of a protocol scheme such as "http" or "https". Schemes are identified
* by lowercase names. Supported schemes are typically collected in a {@link SchemeRegistry
* SchemeRegistry}.
* <p>
* For example, to configure support for "https://" URLs, you could write code like the following:
* <pre>
* Scheme https = new Scheme("https", 443, new MySecureSocketFactory());
* SchemeRegistry.DEFAULT.register(https);
* </pre>
*
* @since 4.0
*/
@Immutable
public final class Scheme {
/** The name of this scheme, in lowercase. (e.g. http, https) */
private final String name;
/** The socket factory for this scheme */
private final SchemeSocketFactory socketFactory;
/** The default port for this scheme */
private final int defaultPort;
/** Indicates whether this scheme allows for layered connections */
private final boolean layered;
/** A string representation, for {@link #toString toString}. */
private String stringRep;
/*
* This is used to cache the result of the toString() method
* Since the method always generates the same value, there's no
* need to synchronize, and it does not affect immutability.
*/
/**
* Creates a new scheme.
* Whether the created scheme allows for layered connections
* depends on the class of <code>factory</code>.
*
* @param name the scheme name, for example "http".
* The name will be converted to lowercase.
* @param port the default port for this scheme
* @param factory the factory for creating sockets for communication
* with this scheme
*
* @since 4.1
*/
public Scheme(final String name, final int port, final SchemeSocketFactory factory) {
if (name == null) {
throw new IllegalArgumentException("Scheme name may not be null");
}
if ((port <= 0) || (port > 0xffff)) {
throw new IllegalArgumentException("Port is invalid: " + port);
}
if (factory == null) {
throw new IllegalArgumentException("Socket factory may not be null");
}
this.name = name.toLowerCase(Locale.ENGLISH);
this.socketFactory = factory;
this.defaultPort = port;
this.layered = factory instanceof LayeredSchemeSocketFactory;
}
/**
* Creates a new scheme.
* Whether the created scheme allows for layered connections
* depends on the class of <code>factory</code>.
*
* @param name the scheme name, for example "http".
* The name will be converted to lowercase.
* @param factory the factory for creating sockets for communication
* with this scheme
* @param port the default port for this scheme
*
* @deprecated Use {@link #Scheme(String, int, SchemeSocketFactory)}
*/
@Deprecated
public Scheme(final String name,
final SocketFactory factory,
final int port) {
if (name == null) {
throw new IllegalArgumentException
("Scheme name may not be null");
}
if (factory == null) {
throw new IllegalArgumentException
("Socket factory may not be null");
}
if ((port <= 0) || (port > 0xffff)) {
throw new IllegalArgumentException
("Port is invalid: " + port);
}
this.name = name.toLowerCase(Locale.ENGLISH);
if (factory instanceof LayeredSocketFactory) {
this.socketFactory = new LayeredSchemeSocketFactoryAdaptor(
(LayeredSocketFactory) factory);
this.layered = true;
} else {
this.socketFactory = new SchemeSocketFactoryAdaptor(factory);
this.layered = false;
}
this.defaultPort = port;
}
/**
* Obtains the default port.
*
* @return the default port for this scheme
*/
public final int getDefaultPort() {
return defaultPort;
}
/**
* Obtains the socket factory.
* If this scheme is {@link #isLayered layered}, the factory implements
* {@link LayeredSocketFactory LayeredSocketFactory}.
*
* @return the socket factory for this scheme
*
* @deprecated Use {@link #getSchemeSocketFactory()}
*/
@Deprecated
public final SocketFactory getSocketFactory() {
if (this.socketFactory instanceof SchemeSocketFactoryAdaptor) {
return ((SchemeSocketFactoryAdaptor) this.socketFactory).getFactory();
} else {
if (this.layered) {
return new LayeredSocketFactoryAdaptor(
(LayeredSchemeSocketFactory) this.socketFactory);
} else {
return new SocketFactoryAdaptor(this.socketFactory);
}
}
}
/**
* Obtains the socket factory.
* If this scheme is {@link #isLayered layered}, the factory implements
* {@link LayeredSocketFactory LayeredSchemeSocketFactory}.
*
* @return the socket factory for this scheme
*
* @since 4.1
*/
public final SchemeSocketFactory getSchemeSocketFactory() {
return this.socketFactory;
}
/**
* Obtains the scheme name.
*
* @return the name of this scheme, in lowercase
*/
public final String getName() {
return name;
}
/**
* Indicates whether this scheme allows for layered connections.
*
* @return <code>true</code> if layered connections are possible,
* <code>false</code> otherwise
*/
public final boolean isLayered() {
return layered;
}
/**
* Resolves the correct port for this scheme.
* Returns the given port if it is valid, the default port otherwise.
*
* @param port the port to be resolved,
* a negative number to obtain the default port
*
* @return the given port or the defaultPort
*/
public final int resolvePort(int port) {
return port <= 0 ? defaultPort : port;
}
/**
* Return a string representation of this object.
*
* @return a human-readable string description of this scheme
*/
@Override
public final String toString() {
if (stringRep == null) {
StringBuilder buffer = new StringBuilder();
buffer.append(this.name);
buffer.append(':');
buffer.append(Integer.toString(this.defaultPort));
stringRep = buffer.toString();
}
return stringRep;
}
@Override
public final boolean equals(Object obj) {
if (this == obj) return true;
if (obj instanceof Scheme) {
Scheme that = (Scheme) obj;
return this.name.equals(that.name)
&& this.defaultPort == that.defaultPort
&& this.layered == that.layered;
} else {
return false;
}
}
@Override
public int hashCode() {
int hash = LangUtils.HASH_SEED;
hash = LangUtils.hashCode(hash, this.defaultPort);
hash = LangUtils.hashCode(hash, this.name);
hash = LangUtils.hashCode(hash, this.layered);
return hash;
}
}