org.apache.http.conn.routing

## Class RouteTracker

- java.lang.Object
- - org.apache.http.conn.routing.RouteTracker

- All Implemented Interfaces:
    Cloneable, RouteInfo

      public final class RouteTracker
      extends Object
      implements RouteInfo, Cloneable

  Helps tracking the steps in establishing a route.
  Since:
    4.0

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from interface org.apache.http.conn.routing.RouteInfo

      `RouteInfo.LayerType, RouteInfo.TunnelType`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `RouteTracker(org.apache.http.HttpHost target, InetAddress local)` Creates a new route tracker.
    `RouteTracker(HttpRoute route)` Creates a new tracker for the given route.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Object` | `clone()`
    `void` | `connectProxy(org.apache.http.HttpHost proxy, boolean secure)` Tracks connecting to the first proxy.
    `void` | `connectTarget(boolean secure)` Tracks connecting to the target.
    `boolean` | `equals(Object o)` Compares this tracked route to another.
    `int` | `getHopCount()` Obtains the number of hops in this route.
    `org.apache.http.HttpHost` | `getHopTarget(int hop)` Obtains the target of a hop in this route.
    `RouteInfo.LayerType` | `getLayerType()` Obtains the layering type of this route.
    `InetAddress` | `getLocalAddress()` Obtains the local address to connect from.
    `org.apache.http.HttpHost` | `getProxyHost()` Obtains the first proxy host.
    `org.apache.http.HttpHost` | `getTargetHost()` Obtains the target host.
    `RouteInfo.TunnelType` | `getTunnelType()` Obtains the tunnel type of this route.
    `int` | `hashCode()` Generates a hash code for this tracked route.
    `boolean` | `isConnected()`
    `boolean` | `isLayered()` Checks whether this route includes a layered protocol.
    `boolean` | `isSecure()` Checks whether this route is secure.
    `boolean` | `isTunnelled()` Checks whether this route is tunnelled through a proxy.
    `void` | `layerProtocol(boolean secure)` Tracks layering a protocol.
    `void` | `reset()`
    `HttpRoute` | `toRoute()` Obtains the tracked route.
    `String` | `toString()` Obtains a description of the tracked route.
    `void` | `tunnelProxy(org.apache.http.HttpHost proxy, boolean secure)` Tracks tunnelling to a proxy in a proxy chain.
    `void` | `tunnelTarget(boolean secure)` Tracks tunnelling to the target.

    - ### Methods inherited from class java.lang.Object

      `finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### RouteTracker

          public RouteTracker(org.apache.http.HttpHost target,
                      InetAddress local)

      Creates a new route tracker. The target and origin need to be specified at creation time.
      Parameters:
        `target` - the host to which to route
        `local` - the local address to route from, or `null` for the default

    - #### RouteTracker

          public RouteTracker(HttpRoute route)

      Creates a new tracker for the given route. Only target and origin are taken from the route, everything else remains to be tracked.
      Parameters:
        `route` - the route to track

  - ### Method Detail

    - #### reset

          public void reset()

      Since:
        4.2

    - #### connectTarget

          public void connectTarget(boolean secure)

      Tracks connecting to the target.
      Parameters:
        `secure` - `true` if the route is secure, `false` otherwise

    - #### connectProxy

          public void connectProxy(org.apache.http.HttpHost proxy,
                          boolean secure)

      Tracks connecting to the first proxy.
      Parameters:
        `proxy` - the proxy connected to
        `secure` - `true` if the route is secure, `false` otherwise

    - #### tunnelTarget

          public void tunnelTarget(boolean secure)

      Tracks tunnelling to the target.
      Parameters:
        `secure` - `true` if the route is secure, `false` otherwise

    - #### tunnelProxy

          public void tunnelProxy(org.apache.http.HttpHost proxy,
                         boolean secure)

      Tracks tunnelling to a proxy in a proxy chain. This will extend the tracked proxy chain, but it does not mark the route as tunnelled. Only end-to-end tunnels are considered there.
      Parameters:
        `proxy` - the proxy tunnelled to
        `secure` - `true` if the route is secure, `false` otherwise

    - #### layerProtocol

          public void layerProtocol(boolean secure)

      Tracks layering a protocol.
      Parameters:
        `secure` - `true` if the route is secure, `false` otherwise

    - #### getTargetHost

          public org.apache.http.HttpHost getTargetHost()

      Description copied from interface: `RouteInfo`
      Obtains the target host.
      Specified by:
        `getTargetHost` in interface `RouteInfo`
      Returns:
        the target host

    - #### getLocalAddress

          public InetAddress getLocalAddress()

      Description copied from interface: `RouteInfo`
      Obtains the local address to connect from.
      Specified by:
        `getLocalAddress` in interface `RouteInfo`
      Returns:
        the local address, or `null`

    - #### getHopCount

          public int getHopCount()

      Description copied from interface: `RouteInfo`
      Obtains the number of hops in this route. A direct route has one hop. A route through a proxy has two hops. A route through a chain of n proxies has n+1 hops.
      Specified by:
        `getHopCount` in interface `RouteInfo`
      Returns:
        the number of hops in this route

    - #### getHopTarget

          public org.apache.http.HttpHost getHopTarget(int hop)

      Description copied from interface: `RouteInfo`
      Obtains the target of a hop in this route. The target of the last hop is the `target host`, the target of previous hops is the respective proxy in the chain. For a route through exactly one proxy, target of hop 0 is the proxy and target of hop 1 is the target host.
      Specified by:
        `getHopTarget` in interface `RouteInfo`
      Parameters:
        `hop` - index of the hop for which to get the target, 0 for first
      Returns:
        the target of the given hop

    - #### getProxyHost

          public org.apache.http.HttpHost getProxyHost()

      Description copied from interface: `RouteInfo`
      Obtains the first proxy host.
      Specified by:
        `getProxyHost` in interface `RouteInfo`
      Returns:
        the first proxy in the proxy chain, or `null` if this route is direct

    - #### isConnected

          public boolean isConnected()

    - #### getTunnelType

          public RouteInfo.TunnelType getTunnelType()

      Description copied from interface: `RouteInfo`
      Obtains the tunnel type of this route. If there is a proxy chain, only end-to-end tunnels are considered.
      Specified by:
        `getTunnelType` in interface `RouteInfo`
      Returns:
        the tunnelling type

    - #### isTunnelled

          public boolean isTunnelled()

      Description copied from interface: `RouteInfo`
      Checks whether this route is tunnelled through a proxy. If there is a proxy chain, only end-to-end tunnels are considered.
      Specified by:
        `isTunnelled` in interface `RouteInfo`
      Returns:
        `true` if tunnelled end-to-end through at least one proxy, `false` otherwise

    - #### getLayerType

          public RouteInfo.LayerType getLayerType()

      Description copied from interface: `RouteInfo`
      Obtains the layering type of this route. In the presence of proxies, only layering over an end-to-end tunnel is considered.
      Specified by:
        `getLayerType` in interface `RouteInfo`
      Returns:
        the layering type

    - #### isLayered

          public boolean isLayered()

      Description copied from interface: `RouteInfo`
      Checks whether this route includes a layered protocol. In the presence of proxies, only layering over an end-to-end tunnel is considered.
      Specified by:
        `isLayered` in interface `RouteInfo`
      Returns:
        `true` if layered, `false` otherwise

    - #### isSecure

          public boolean isSecure()

      Description copied from interface: `RouteInfo`
      Checks whether this route is secure.
      Specified by:
        `isSecure` in interface `RouteInfo`
      Returns:
        `true` if secure, `false` otherwise

    - #### toRoute

          public HttpRoute toRoute()

      Obtains the tracked route. If a route has been tracked, it is `connected`. If not connected, nothing has been tracked so far.
      Returns:
        the tracked route, or `null` if nothing has been tracked so far

    - #### equals

          public boolean equals(Object o)

      Compares this tracked route to another.
      Overrides:
        `equals` in class `Object`
      Parameters:
        `o` - the object to compare with
      Returns:
        `true` if the argument is the same tracked route, `false`

    - #### hashCode

          public int hashCode()

      Generates a hash code for this tracked route. Route trackers are modifiable and should therefore not be used as lookup keys. Use `toRoute` to obtain an unmodifiable representation of the tracked route.
      Overrides:
        `hashCode` in class `Object`
      Returns:
        the hash code

    - #### toString

          public String toString()

      Obtains a description of the tracked route.
      Overrides:
        `toString` in class `Object`
      Returns:
        a human-readable representation of the tracked route

    - #### clone

          public Object clone()
                       throws CloneNotSupportedException

      Overrides:
        `clone` in class `Object`
      Throws:
        `CloneNotSupportedException`

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