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 * to you under the Apache License, Version 2.0 (the
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 * KIND, either express or implied.  See the License for the
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 * This software consists of voluntary contributions made by many
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package org.apache.http.conn.scheme;

import java.util.Locale;

import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.util.Args;
import org.apache.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 
SchemeRegistry. 

For example, to configure support for "https://" URLs, you could write code like the following:

Scheme https = new Scheme("https", 443, new MySecureSocketFactory());
SchemeRegistry registry = new SchemeRegistry();
registry.register(https);

Since:
4.0
Deprecated:
(4.3) use SchemePortResolver for default port resolution and Registry for socket factory lookups./**
 * 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:
 * </p>
 * <pre>
 * Scheme https = new Scheme("https", 443, new MySecureSocketFactory());
 * SchemeRegistry registry = new SchemeRegistry();
 * registry.register(https);
 * </pre>
 *
 * @since 4.0
 *
 * @deprecated (4.3) use {@link org.apache.http.conn.SchemePortResolver} for default port
 * resolution and {@link org.apache.http.config.Registry} for socket factory lookups.
 */
@Contract(threading = ThreadingBehavior.IMMUTABLE)
@Deprecated
public final class Scheme {

    
The name of this scheme, in lowercase. (e.g. http, https) /** The name of this scheme, in lowercase. (e.g. http, https) */
    private final String name;

    
The socket factory for this scheme /** The socket factory for this scheme */
    private final SchemeSocketFactory socketFactory;

    
The default port for this scheme /** The default port for this scheme */
    private final int defaultPort;

    
Indicates whether this scheme allows for layered connections /** Indicates whether this scheme allows for layered connections */
    private final boolean layered;

    
A string representation, for toString. /** 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 factory. 
Params:
name –      the scheme name, for example "http".
                 The name will be converted to lowercase.
port –      the default port for this scheme
factory –   the factory for creating sockets for communication
                 with this scheme
Since:
4.1/**
     * Creates a new scheme.
     * Whether the created scheme allows for layered connections
     * depends on the class of {@code factory}.
     *
     * @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) {
        Args.notNull(name, "Scheme name");
        Args.check(port > 0 && port <= 0xffff, "Port is invalid");
        Args.notNull(factory, "Socket factory");
        this.name = name.toLowerCase(Locale.ENGLISH);
        this.defaultPort = port;
        if (factory instanceof SchemeLayeredSocketFactory) {
            this.layered = true;
            this.socketFactory = factory;
        } else if (factory instanceof LayeredSchemeSocketFactory) {
            this.layered = true;
            this.socketFactory = new SchemeLayeredSocketFactoryAdaptor2((LayeredSchemeSocketFactory) factory);
        } else {
            this.layered = false;
            this.socketFactory = factory;
        }
    }

    
Creates a new scheme. Whether the created scheme allows for layered connections depends on the class of factory. 
Params:
name –      the scheme name, for example "http".
                 The name will be converted to lowercase.
factory –   the factory for creating sockets for communication
                 with this scheme
port –      the default port for this scheme
Deprecated:
(4.1) Use Scheme(String, int, SchemeSocketFactory)/**
     * Creates a new scheme.
     * Whether the created scheme allows for layered connections
     * depends on the class of {@code factory}.
     *
     * @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 (4.1)  Use {@link #Scheme(String, int, SchemeSocketFactory)}
     */
    @Deprecated
    public Scheme(final String name,
                  final SocketFactory factory,
                  final int port) {

        Args.notNull(name, "Scheme name");
        Args.notNull(factory, "Socket factory");
        Args.check(port > 0 && port <= 0xffff, "Port is invalid");

        this.name = name.toLowerCase(Locale.ENGLISH);
        if (factory instanceof LayeredSocketFactory) {
            this.socketFactory = new SchemeLayeredSocketFactoryAdaptor(
                    (LayeredSocketFactory) factory);
            this.layered = true;
        } else {
            this.socketFactory = new SchemeSocketFactoryAdaptor(factory);
            this.layered = false;
        }
        this.defaultPort = port;
    }

    
Obtains the default port.
Returns:
 the default port for this scheme/**
     * 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 layered, the factory implements LayeredSocketFactory. 
Returns:
 the socket factory for this scheme
Deprecated:
(4.1) Use getSchemeSocketFactory()/**
     * 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 (4.1)  Use {@link #getSchemeSocketFactory()}
     */
    @Deprecated
    public final SocketFactory getSocketFactory() {
        if (this.socketFactory instanceof SchemeSocketFactoryAdaptor) {
            return ((SchemeSocketFactoryAdaptor) this.socketFactory).getFactory();
        }
        return this.layered
                        ? new LayeredSocketFactoryAdaptor(
                                        (LayeredSchemeSocketFactory) this.socketFactory)
                        : new SocketFactoryAdaptor(this.socketFactory);
    }

    
Obtains the socket factory. If this scheme is layered, the factory implements LayeredSchemeSocketFactory. 
Returns:
 the socket factory for this scheme
Since:
4.1/**
     * 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.
Returns:
 the name of this scheme, in lowercase/**
     * 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.
Returns:
true if layered connections are possible, false otherwise/**
     * Indicates whether this scheme allows for layered connections.
     *
     * @return {@code true} if layered connections are possible,
     *         {@code false} 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.
Params:
port –      the port to be resolved,
                 a negative number to obtain the default port
Returns:
the given port or the defaultPort/**
     * 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(final int port) {
        return port <= 0 ? defaultPort : port;
    }

    
Return a string representation of this object.
Returns:
 a human-readable string description of this scheme/**
     * Return a string representation of this object.
     *
     * @return  a human-readable string description of this scheme
     */
    @Override
    public final String toString() {
        if (stringRep == null) {
            final 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(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj instanceof Scheme) {
            final Scheme that = (Scheme) obj;
            return this.name.equals(that.name)
                && this.defaultPort == that.defaultPort
                && this.layered == that.layered;
        }
        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;
    }

}