org.eclipse.jetty.servlet

## Class Holder<T>

- java.lang.Object
- - org.eclipse.jetty.util.component.AbstractLifeCycle
  - - org.eclipse.jetty.servlet.Holder<T>

- All Implemented Interfaces:
    Dumpable, LifeCycle
  Direct Known Subclasses:
    FilterHolder, ServletHolder

      public class Holder<T>
      extends AbstractLifeCycle
      implements Dumpable

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `protected class` | `Holder.HolderConfig`
    `protected class` | `Holder.HolderRegistration`

    - ### Nested classes/interfaces inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

      `AbstractLifeCycle.AbstractLifeCycleListener`

    - ### Nested classes/interfaces inherited from interface org.eclipse.jetty.util.component.LifeCycle

      `LifeCycle.Listener`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected boolean` | `_asyncSupported`
    `protected Class<? extends T>` | `_class`
    `protected String` | `_className`
    `protected String` | `_displayName`
    `protected boolean` | `_extInstance`
    `protected Map<String,String>` | `_initParams`
    `protected String` | `_name`
    `protected ServletHandler` | `_servletHandler`

    - ### Fields inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

      `_listeners, FAILED, RUNNING, STARTED, STARTING, STOPPED, STOPPING`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `Holder()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `destroyInstance(Object instance)`
    `void` | `doStart()`
    `void` | `doStop()`
    `String` | `dump()`
    `void` | `dump(Appendable out, String indent)`
    `String` | `getClassName()`
    `String` | `getDisplayName()`
    `Class<? extends T>` | `getHeldClass()`
    `String` | `getInitParameter(String param)`
    `Enumeration` | `getInitParameterNames()`
    `Map<String,String>` | `getInitParameters()`
    `String` | `getName()`
    `ServletHandler` | `getServletHandler()`
    `protected void` | `illegalStateIfContextStarted()`
    `boolean` | `isAsyncSupported()`
    `boolean` | `isInstance()`
    `void` | `setAsyncSupported(boolean suspendable)`
    `void` | `setClassName(String className)`
    `void` | `setDisplayName(String name)`
    `void` | `setHeldClass(Class<? extends T> held)`
    `void` | `setInitParameter(String param, String value)`
    `void` | `setInitParameters(Map<String,String> map)`
    `void` | `setName(String name)` The name is a primary key for the held object.
    `void` | `setServletHandler(ServletHandler servletHandler)`
    `String` | `toString()`

    - ### Methods inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

      `addLifeCycleListener, getState, getState, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, removeLifeCycleListener, start, stop`

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

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

- - ### Field Detail

    - #### _class

          protected transient Class<? extends T> _class

    - #### _initParams

          protected final Map<String,String> _initParams

    - #### _className

          protected String _className

    - #### _displayName

          protected String _displayName

    - #### _extInstance

          protected boolean _extInstance

    - #### _asyncSupported

          protected boolean _asyncSupported

    - #### _name

          protected String _name

    - #### _servletHandler

          protected ServletHandler _servletHandler

  - ### Constructor Detail

    - #### Holder

          protected Holder()

  - ### Method Detail

    - #### isInstance

          public boolean isInstance()

      Returns:
        True if this holder was created for a specific instance.

    - #### doStart

          public void doStart()
                       throws Exception

      Overrides:
        `doStart` in class `AbstractLifeCycle`
      Throws:
        `Exception`

    - #### doStop

          public void doStop()
                      throws Exception

      Overrides:
        `doStop` in class `AbstractLifeCycle`
      Throws:
        `Exception`

    - #### getClassName

          public String getClassName()

    - #### getHeldClass

          public Class<? extends T> getHeldClass()

    - #### getDisplayName

          public String getDisplayName()

    - #### getInitParameter

          public String getInitParameter(String param)

    - #### getInitParameterNames

          public Enumeration getInitParameterNames()

    - #### getInitParameters

          public Map<String,String> getInitParameters()

    - #### getName

          public String getName()

    - #### getServletHandler

          public ServletHandler getServletHandler()

      Returns:
        Returns the servletHandler.

    - #### destroyInstance

          public void destroyInstance(Object instance)
                               throws Exception

      Throws:
        `Exception`

    - #### setClassName

          public void setClassName(String className)

      Parameters:
        `className` - The className to set.

    - #### setHeldClass

          public void setHeldClass(Class<? extends T> held)

      Parameters:
        `held` - The class to hold

    - #### setDisplayName

          public void setDisplayName(String name)

    - #### setInitParameter

          public void setInitParameter(String param,
                              String value)

    - #### setInitParameters

          public void setInitParameters(Map<String,String> map)

    - #### setName

          public void setName(String name)

      The name is a primary key for the held object. Ensure that the name is set BEFORE adding a Holder (eg ServletHolder or FilterHolder) to a ServletHandler.
      Parameters:
        `name` - The name to set.

    - #### setServletHandler

          public void setServletHandler(ServletHandler servletHandler)

      Parameters:
        `servletHandler` - The `ServletHandler` that will handle requests dispatched to this servlet.

    - #### setAsyncSupported

          public void setAsyncSupported(boolean suspendable)

    - #### isAsyncSupported

          public boolean isAsyncSupported()

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

    - #### illegalStateIfContextStarted

          protected void illegalStateIfContextStarted()

    - #### dump

          public void dump(Appendable out,
                  String indent)
                    throws IOException

      Specified by:
        `dump` in interface `Dumpable`
      Throws:
        `IOException`

    - #### dump

          public String dump()

      Specified by:
        `dump` in interface `Dumpable`

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