org.apache.hc.client5.http.impl

## Class InMemoryDnsResolver

- java.lang.Object
- - org.apache.hc.client5.http.impl.InMemoryDnsResolver

- All Implemented Interfaces:
    DnsResolver

      @Contract(threading=STATELESS)
      public class InMemoryDnsResolver
      extends Object
      implements DnsResolver

  In-memory `DnsResolver` implementation.
  Since:
    4.2

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `InMemoryDnsResolver()` Builds a DNS resolver that will resolve the host names against a collection held in-memory.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `add(String host, InetAddress... ips)` Associates the given array of IP addresses to the given host in this DNS overrider.
    `InetAddress[]` | `resolve(String host)` Returns the IP address for the specified host name, or null if the given host is not recognized or the associated IP address cannot be used to build an InetAddress instance.
    `String` | `resolveCanonicalHostname(String host)` Gets the fully qualified domain name for given host name.

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

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### InMemoryDnsResolver

          public InMemoryDnsResolver()

      Builds a DNS resolver that will resolve the host names against a collection held in-memory.

  - ### Method Detail

    - #### add

          public void add(String host,
                 InetAddress... ips)

      Associates the given array of IP addresses to the given host in this DNS overrider. The IP addresses are assumed to be already resolved.
      Parameters:
        `host` - The host name to be associated with the given IP.
        `ips` - array of IP addresses to be resolved by this DNS overrider to the given host name.

    - #### resolve

          public InetAddress[] resolve(String host)
                                throws UnknownHostException

      Returns the IP address for the specified host name, or null if the given host is not recognized or the associated IP address cannot be used to build an InetAddress instance.
      Specified by:
        `resolve` in interface `DnsResolver`
      Parameters:
        `host` - The host name to be resolved by this resolver.
      Returns:
        The IP address associated to the given host name, or null if the host name is not known by the implementation class.
      Throws:
        `UnknownHostException`
      See Also:
        `InetAddress`

    - #### resolveCanonicalHostname

          public String resolveCanonicalHostname(String host)
                                          throws UnknownHostException

      Description copied from interface: `DnsResolver`
      Gets the fully qualified domain name for given host name.
      Specified by:
        `resolveCanonicalHostname` in interface `DnsResolver`
      Throws:
        `UnknownHostException`

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