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## org.apache.catalina.core
Class ContainerBase

    java.lang.Object
      |
      +--org.apache.catalina.core.ContainerBase

All Implemented Interfaces:
  Container, Lifecycle, Pipeline

Direct Known Subclasses:
  StandardContext, StandardEngine, StandardHost, StandardWrapper

public abstract class ContainerBase
extends java.lang.Object
implements Container, Lifecycle, Pipeline

Abstract implementation of the Container interface, providing common functionality required by nearly every implementation. Classes extending this base class must implement `getInfo()`, and may implement a replacement for `invoke()`.

All subclasses of this abstract base class will include support for a Pipeline object that defines the processing to be performed for each request received by the `invoke()` method of this class, utilizig the "Chain of Responsibility" design pattern. A subclass should encapsulate its own processing functionality as a `Valve`, and configure this Valve into the pipeline by calling `setBasic()`.

This implementation fires property change events, per the JavaBeans design pattern, for changes in singleton properties. In addition, it fires the following `ContainerEvent` events to listeners who register themselves with `addContainerListener()`:

Type | Data | Description
--- | --- | ---
`addChild` | `Container` | Child container added to this Container.
`addValve` | `Valve` | Valve added to this Container.
`removeChild` | `Container` | Child container removed from this Container.
`removeValve` | `Valve` | Valve removed from this Container.
`start` | `null` | Container was started.
`stop` | `null` | Container was stopped.

Subclasses that fire additional events should document them in the class comments of the implementation class.

Version:
  $Revision: 1.14.2.1 $ $Date: 2002/01/08 22:22:27 $
Author:
  Craig R. McClanahan

Field Summary
`protected java.util.HashMap` | `children` The child Containers belonging to this Container, keyed by name.
`protected Cluster` | `cluster` The cluster with which this Container is associated.
`protected int` | `debug` The debugging detail level for this component.
`protected LifecycleSupport` | `lifecycle` The lifecycle event support for this component.
`protected java.util.ArrayList` | `listeners` The container event listeners for this Container.
`protected Loader` | `loader` The Loader implementation with which this Container is associated.
`protected Logger` | `logger` The Logger implementation with which this Container is associated.
`protected Manager` | `manager` The Manager implementation with which this Container is associated.
`protected Mapper` | `mapper` The one and only Mapper associated with this Container, if any.
`protected java.lang.String` | `mapperClass` The Java class name of the default Mapper class for this Container.
`protected java.util.HashMap` | `mappers` The set of Mappers associated with this Container, keyed by protocol.
`protected java.lang.String` | `name` The human-readable name of this Container.
`protected Container` | `parent` The parent Container to which this Container is a child.
`protected java.lang.ClassLoader` | `parentClassLoader` The parent class loader to be configured when we install a Loader.
`protected Pipeline` | `pipeline` The Pipeline object with which this Container is associated.
`protected Realm` | `realm` The Realm with which this Container is associated.
`protected javax.naming.directory.DirContext` | `resources` The resources DirContext object with which this Container is associated.
`protected static StringManager` | `sm` The string manager for this package.
`protected boolean` | `started` Has this component been started?
`protected java.beans.PropertyChangeSupport` | `support` The property change support for this component.

Fields inherited from interface org.apache.catalina.Container
`ADD_CHILD_EVENT, ADD_MAPPER_EVENT, ADD_VALVE_EVENT, REMOVE_CHILD_EVENT, REMOVE_MAPPER_EVENT, REMOVE_VALVE_EVENT`

Fields inherited from interface org.apache.catalina.Lifecycle
`START_EVENT, STOP_EVENT`

Constructor Summary
`ContainerBase()`

Method Summary
`void` | `addChild(Container child)` Add a new child Container to those associated with this Container, if supported.
`void` | `addContainerListener(ContainerListener listener)` Add a container event listener to this component.
`protected void` | `addDefaultMapper(java.lang.String mapperClass)` Add a default Mapper implementation if none have been configured explicitly.
`void` | `addLifecycleListener(LifecycleListener listener)` Add a lifecycle event listener to this component.
`void` | `addMapper(Mapper mapper)` Add the specified Mapper associated with this Container.
`void` | `addPropertyChangeListener(java.beans.PropertyChangeListener listener)` Add a property change listener to this component.
`void` | `addValve(Valve valve)` Add a new Valve to the end of the pipeline associated with this Container.
`Container` | `findChild(java.lang.String name)` Return the child Container, associated with this Container, with the specified name (if any); otherwise, return `null`
`Container[]` | `findChildren()` Return the set of children Containers associated with this Container.
`Mapper` | `findMapper(java.lang.String protocol)` Return the Mapper associated with the specified protocol, if there is one.
`Mapper[]` | `findMappers()` Return the set of Mappers associated with this Container.
`void` | `fireContainerEvent(java.lang.String type, java.lang.Object data)` Notify all container event listeners that a particular event has occurred for this Container.
`Valve` | `getBasic()` Return the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any).
`Cluster` | `getCluster()` Return the Cluster with which this Container is associated.
`int` | `getDebug()` Return the debugging detail level for this component.
`abstract java.lang.String` | `getInfo()` Return descriptive information about this Container implementation and the corresponding version number, in the format `<description>/<version>`.
`Loader` | `getLoader()` Return the Loader with which this Container is associated.
`Logger` | `getLogger()` Return the Logger with which this Container is associated.
`Manager` | `getManager()` Return the Manager with which this Container is associated.
`java.lang.String` | `getName()` Return a name string (suitable for use by humans) that describes this Container.
`Container` | `getParent()` Return the Container for which this Container is a child, if there is one.
`java.lang.ClassLoader` | `getParentClassLoader()` Return the parent class loader (if any) for this web application.
`Pipeline` | `getPipeline()` Return the Pipeline object that manages the Valves associated with this Container.
`Realm` | `getRealm()` Return the Realm with which this Container is associated.
`javax.naming.directory.DirContext` | `getResources()` Return the resources DirContext object with which this Container is associated.
`Valve[]` | `getValves()` Return the set of Valves in the pipeline associated with this Container, including the basic Valve (if any).
`void` | `invoke(Request request, Response response)` Process the specified Request, to produce the corresponding Response, by invoking the first Valve in our pipeline (if any), or the basic Valve otherwise.
`protected void` | `log(java.lang.String message)` Log the specified message to our current Logger (if any).
`protected void` | `log(java.lang.String message, java.lang.Throwable throwable)` Log the specified message and exception to our current Logger (if any).
`protected java.lang.String` | `logName()` Return the abbreviated name of this container for logging messsages
`Container` | `map(Request request, boolean update)` Return the child Container that should be used to process this Request, based upon its characteristics.
`void` | `removeChild(Container child)` Remove an existing child Container from association with this parent Container.
`void` | `removeContainerListener(ContainerListener listener)` Remove a container event listener from this component.
`void` | `removeLifecycleListener(LifecycleListener listener)` Remove a lifecycle event listener from this component.
`void` | `removeMapper(Mapper mapper)` Remove a Mapper associated with this Container, if any.
`void` | `removePropertyChangeListener(java.beans.PropertyChangeListener listener)` Remove a property change listener from this component.
`void` | `removeValve(Valve valve)` Remove the specified Valve from the pipeline associated with this Container, if it is found; otherwise, do nothing.
`void` | `setBasic(Valve valve)` Set the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any).
`void` | `setCluster(Cluster cluster)` Set the Cluster with which this Container is associated.
`void` | `setDebug(int debug)` Set the debugging detail level for this component.
`void` | `setLoader(Loader loader)` Set the Loader with which this Container is associated.
`void` | `setLogger(Logger logger)` Set the Logger with which this Container is associated.
`void` | `setManager(Manager manager)` Set the Manager with which this Container is associated.
`void` | `setName(java.lang.String name)` Set a name string (suitable for use by humans) that describes this Container.
`void` | `setParent(Container container)` Set the parent Container to which this Container is being added as a child.
`void` | `setParentClassLoader(java.lang.ClassLoader parent)` Set the parent class loader (if any) for this web application.
`void` | `setRealm(Realm realm)` Set the Realm with which this Container is associated.
`void` | `setResources(javax.naming.directory.DirContext resources)` Set the resources DirContext object with which this Container is associated.
`void` | `start()` Prepare for active use of the public methods of this Component.
`void` | `stop()` Gracefully shut down active use of the public methods of this Component.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### children

    protected java.util.HashMap children

  The child Containers belonging to this Container, keyed by name.

### debug

    protected int debug

  The debugging detail level for this component.

### lifecycle

    protected LifecycleSupport lifecycle

  The lifecycle event support for this component.

### listeners

    protected java.util.ArrayList listeners

  The container event listeners for this Container.

### loader

    protected Loader loader

  The Loader implementation with which this Container is associated.

### logger

    protected Logger logger

  The Logger implementation with which this Container is associated.

### manager

    protected Manager manager

  The Manager implementation with which this Container is associated.

### cluster

    protected Cluster cluster

  The cluster with which this Container is associated.

### mapper

    protected Mapper mapper

  The one and only Mapper associated with this Container, if any.

### mappers

    protected java.util.HashMap mappers

  The set of Mappers associated with this Container, keyed by protocol.

### mapperClass

    protected java.lang.String mapperClass

  The Java class name of the default Mapper class for this Container.

### name

    protected java.lang.String name

  The human-readable name of this Container.

### parent

    protected Container parent

  The parent Container to which this Container is a child.

### parentClassLoader

    protected java.lang.ClassLoader parentClassLoader

  The parent class loader to be configured when we install a Loader.

### pipeline

    protected Pipeline pipeline

  The Pipeline object with which this Container is associated.

### realm

    protected Realm realm

  The Realm with which this Container is associated.

### resources

    protected javax.naming.directory.DirContext resources

  The resources DirContext object with which this Container is associated.

### sm

    protected static StringManager sm

  The string manager for this package.

### started

    protected boolean started

  Has this component been started?

### support

    protected java.beans.PropertyChangeSupport support

  The property change support for this component.

Constructor Detail

### ContainerBase

    public ContainerBase()

Method Detail

### getDebug

    public int getDebug()

  Return the debugging detail level for this component.

### setDebug

    public void setDebug(int debug)

  Set the debugging detail level for this component.

  Parameters:
    `debug` - The new debugging detail level

### getInfo

    public abstract java.lang.String getInfo()

  Return descriptive information about this Container implementation and the corresponding version number, in the format `<description>/<version>`.

  Specified by:
    `getInfo` in interface `Container`

### getLoader

    public Loader getLoader()

  Return the Loader with which this Container is associated. If there is no associated Loader, return the Loader associated with our parent Container (if any); otherwise, return `null`.

  Specified by:
    `getLoader` in interface `Container`

### setLoader

    public void setLoader(Loader loader)

  Set the Loader with which this Container is associated.

  Specified by:
    `setLoader` in interface `Container`
  Parameters:
    `loader` - The newly associated loader

### getLogger

    public Logger getLogger()

  Return the Logger with which this Container is associated. If there is no associated Logger, return the Logger associated with our parent Container (if any); otherwise return `null`.

  Specified by:
    `getLogger` in interface `Container`

### setLogger

    public void setLogger(Logger logger)

  Set the Logger with which this Container is associated.

  Specified by:
    `setLogger` in interface `Container`
  Parameters:
    `logger` - The newly associated Logger

### getManager

    public Manager getManager()

  Return the Manager with which this Container is associated. If there is no associated Manager, return the Manager associated with our parent Container (if any); otherwise return `null`.

  Specified by:
    `getManager` in interface `Container`

### setManager

    public void setManager(Manager manager)

  Set the Manager with which this Container is associated.

  Specified by:
    `setManager` in interface `Container`
  Parameters:
    `manager` - The newly associated Manager

### getCluster

    public Cluster getCluster()

  Return the Cluster with which this Container is associated. If there is no associated Cluster, return the Cluster associated with our parent Container (if any); otherwise return `null`.

  Specified by:
    `getCluster` in interface `Container`

### setCluster

    public void setCluster(Cluster cluster)

  Set the Cluster with which this Container is associated.

  Specified by:
    `setCluster` in interface `Container`

### getName

    public java.lang.String getName()

  Return a name string (suitable for use by humans) that describes this Container. Within the set of child containers belonging to a particular parent, Container names must be unique.

  Specified by:
    `getName` in interface `Container`

### setName

    public void setName(java.lang.String name)

  Set a name string (suitable for use by humans) that describes this Container. Within the set of child containers belonging to a particular parent, Container names must be unique.

  Specified by:
    `setName` in interface `Container`
  Parameters:
    `name` - New name of this container
  Throws:
    `java.lang.IllegalStateException` - if this Container has already been added to the children of a parent Container (after which the name may not be changed)

### getParent

    public Container getParent()

  Return the Container for which this Container is a child, if there is one. If there is no defined parent, return `null`.

  Specified by:
    `getParent` in interface `Container`

### setParent

    public void setParent(Container container)

  Set the parent Container to which this Container is being added as a child. This Container may refuse to become attached to the specified Container by throwing an exception.

  Specified by:
    `setParent` in interface `Container`
  Parameters:
    `container` - Container to which this Container is being added as a child
  Throws:
    `java.lang.IllegalArgumentException` - if this Container refuses to become attached to the specified Container

### getParentClassLoader

    public java.lang.ClassLoader getParentClassLoader()

  Return the parent class loader (if any) for this web application. This call is meaningful only after a Loader has been configured.

  Specified by:
    `getParentClassLoader` in interface `Container`

### setParentClassLoader

    public void setParentClassLoader(java.lang.ClassLoader parent)

  Set the parent class loader (if any) for this web application. This call is meaningful only before a Loader has been configured, and the specified value (if non-null) should be passed as an argument to the class loader constructor.

  Specified by:
    `setParentClassLoader` in interface `Container`
  Parameters:
    `parent` - The new parent class loader

### getPipeline

    public Pipeline getPipeline()

  Return the Pipeline object that manages the Valves associated with this Container.

### getRealm

    public Realm getRealm()

  Return the Realm with which this Container is associated. If there is no associated Realm, return the Realm associated with our parent Container (if any); otherwise return `null`.

  Specified by:
    `getRealm` in interface `Container`

### setRealm

    public void setRealm(Realm realm)

  Set the Realm with which this Container is associated.

  Specified by:
    `setRealm` in interface `Container`
  Parameters:
    `realm` - The newly associated Realm

### getResources

    public javax.naming.directory.DirContext getResources()

  Return the resources DirContext object with which this Container is associated. If there is no associated resources object, return the resources associated with our parent Container (if any); otherwise return `null`.

  Specified by:
    `getResources` in interface `Container`

### setResources

    public void setResources(javax.naming.directory.DirContext resources)

  Set the resources DirContext object with which this Container is associated.

  Specified by:
    `setResources` in interface `Container`
  Parameters:
    `resources` - The newly associated DirContext

### addChild

    public void addChild(Container child)

  Add a new child Container to those associated with this Container, if supported. Prior to adding this Container to the set of children, the child's `setParent()` method must be called, with this Container as an argument. This method may thrown an `IllegalArgumentException` if this Container chooses not to be attached to the specified Container, in which case it is not added

  Specified by:
    `addChild` in interface `Container`
  Parameters:
    `child` - New child Container to be added
  Throws:
    `java.lang.IllegalArgumentException` - if this exception is thrown by the `setParent()` method of the child Container
    `java.lang.IllegalArgumentException` - if the new child does not have a name unique from that of existing children of this Container
    `java.lang.IllegalStateException` - if this Container does not support child Containers

### addContainerListener

    public void addContainerListener(ContainerListener listener)

  Add a container event listener to this component.

  Specified by:
    `addContainerListener` in interface `Container`
  Parameters:
    `listener` - The listener to add

### addMapper

    public void addMapper(Mapper mapper)

  Add the specified Mapper associated with this Container.

  Specified by:
    `addMapper` in interface `Container`
  Parameters:
    `mapper` - The corresponding Mapper implementation
  Throws:
    `java.lang.IllegalArgumentException` - if this exception is thrown by the `setContainer()` method of the Mapper

### addPropertyChangeListener

    public void addPropertyChangeListener(java.beans.PropertyChangeListener listener)

  Add a property change listener to this component.

  Specified by:
    `addPropertyChangeListener` in interface `Container`
  Parameters:
    `listener` - The listener to add

### findChild

    public Container findChild(java.lang.String name)

  Return the child Container, associated with this Container, with the specified name (if any); otherwise, return `null`

  Specified by:
    `findChild` in interface `Container`
  Parameters:
    `name` - Name of the child Container to be retrieved

### findChildren

    public Container[] findChildren()

  Return the set of children Containers associated with this Container. If this Container has no children, a zero-length array is returned.

  Specified by:
    `findChildren` in interface `Container`

### findMapper

    public Mapper findMapper(java.lang.String protocol)

  Return the Mapper associated with the specified protocol, if there is one. If there is only one defined Mapper, use it for all protocols. If there is no matching Mapper, return `null`.

  Specified by:
    `findMapper` in interface `Container`
  Parameters:
    `protocol` - Protocol for which to find a Mapper

### findMappers

    public Mapper[] findMappers()

  Return the set of Mappers associated with this Container. If this Container has no Mappers, a zero-length array is returned.

  Specified by:
    `findMappers` in interface `Container`

### invoke

    public void invoke(Request request,
                       Response response)
                throws java.io.IOException,
                       javax.servlet.ServletException

  Process the specified Request, to produce the corresponding Response, by invoking the first Valve in our pipeline (if any), or the basic Valve otherwise.

  Specified by:
    `invoke` in interface `Container`
  Parameters:
    `request` - Request to be processed
    `response` - Response to be produced
  Throws:
    `java.lang.IllegalStateException` - if neither a pipeline or a basic Valve have been configured for this Container
    `java.io.IOException` - if an input/output error occurred while processing
    `javax.servlet.ServletException` - if a ServletException was thrown while processing this request

### map

    public Container map(Request request,
                         boolean update)

  Return the child Container that should be used to process this Request, based upon its characteristics. If no such child Container can be identified, return `null` instead.

  Specified by:
    `map` in interface `Container`
  Parameters:
    `request` - Request being processed
    `update` - Update the Request to reflect the mapping selection?

### removeChild

    public void removeChild(Container child)

  Remove an existing child Container from association with this parent Container.

  Specified by:
    `removeChild` in interface `Container`
  Parameters:
    `child` - Existing child Container to be removed

### removeContainerListener

    public void removeContainerListener(ContainerListener listener)

  Remove a container event listener from this component.

  Specified by:
    `removeContainerListener` in interface `Container`
  Parameters:
    `listener` - The listener to remove

### removeMapper

    public void removeMapper(Mapper mapper)

  Remove a Mapper associated with this Container, if any.

  Specified by:
    `removeMapper` in interface `Container`
  Parameters:
    `mapper` - The Mapper to be removed

### removePropertyChangeListener

    public void removePropertyChangeListener(java.beans.PropertyChangeListener listener)

  Remove a property change listener from this component.

  Specified by:
    `removePropertyChangeListener` in interface `Container`
  Parameters:
    `listener` - The listener to remove

### addLifecycleListener

    public void addLifecycleListener(LifecycleListener listener)

  Add a lifecycle event listener to this component.

  Specified by:
    `addLifecycleListener` in interface `Lifecycle`
  Parameters:
    `listener` - The listener to add

### removeLifecycleListener

    public void removeLifecycleListener(LifecycleListener listener)

  Remove a lifecycle event listener from this component.

  Specified by:
    `removeLifecycleListener` in interface `Lifecycle`
  Parameters:
    `listener` - The listener to remove

### start

    public void start()
               throws LifecycleException

  Prepare for active use of the public methods of this Component.

  Specified by:
    `start` in interface `Lifecycle`
  Throws:
    `java.lang.IllegalStateException` - if this component has already been started
    `LifecycleException` - if this component detects a fatal error that prevents it from being started

### stop

    public void stop()
              throws LifecycleException

  Gracefully shut down active use of the public methods of this Component.

  Specified by:
    `stop` in interface `Lifecycle`
  Throws:
    `java.lang.IllegalStateException` - if this component has not been started
    `LifecycleException` - if this component detects a fatal error that needs to be reported

### addValve

    public void addValve(Valve valve)

  Add a new Valve to the end of the pipeline associated with this Container. Prior to adding the Valve, the Valve's `setContainer` method must be called, with this Container as an argument. The method may throw an `IllegalArgumentException` if this Valve chooses not to be associated with this Container, or `IllegalStateException` if it is already associated with a different Container.

  Specified by:
    `addValve` in interface `Pipeline`
  Parameters:
    `valve` - Valve to be added
  Throws:
    `java.lang.IllegalArgumentException` - if this Container refused to accept the specified Valve
    `java.lang.IllegalArgumentException` - if the specifie Valve refuses to be associated with this Container
    `java.lang.IllegalStateException` - if the specified Valve is already associated with a different Container

### getBasic

    public Valve getBasic()

  Return the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any).

  Specified by:
    `getBasic` in interface `Pipeline`

### getValves

    public Valve[] getValves()

  Return the set of Valves in the pipeline associated with this Container, including the basic Valve (if any). If there are no such Valves, a zero-length array is returned.

  Specified by:
    `getValves` in interface `Pipeline`

### removeValve

    public void removeValve(Valve valve)

  Remove the specified Valve from the pipeline associated with this Container, if it is found; otherwise, do nothing.

  Specified by:
    `removeValve` in interface `Pipeline`
  Parameters:
    `valve` - Valve to be removed

### setBasic

    public void setBasic(Valve valve)

  Set the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any). Prioer to setting the basic Valve, the Valve's `setContainer()` will be called, if it implements `Contained`, with the owning Container as an argument. The method may throw an `IllegalArgumentException` if this Valve chooses not to be associated with this Container, or `IllegalStateException` if it is already associated with a different Container.

  Specified by:
    `setBasic` in interface `Pipeline`
  Parameters:
    `valve` - Valve to be distinguished as the basic Valve

### addDefaultMapper

    protected void addDefaultMapper(java.lang.String mapperClass)

  Add a default Mapper implementation if none have been configured explicitly.

  Parameters:
    `mapperClass` - Java class name of the default Mapper

### fireContainerEvent

    public void fireContainerEvent(java.lang.String type,
                                   java.lang.Object data)

  Notify all container event listeners that a particular event has occurred for this Container. The default implementation performs this notification synchronously using the calling thread.

  Parameters:
    `type` - Event type
    `data` - Event data

### log

    protected void log(java.lang.String message)

  Log the specified message to our current Logger (if any).

  Parameters:
    `message` - Message to be logged

### log

    protected void log(java.lang.String message,
                       java.lang.Throwable throwable)

  Log the specified message and exception to our current Logger (if any).

  Parameters:
    `message` - Message to be logged
    `throwable` - Related exception

### logName

    protected java.lang.String logName()

  Return the abbreviated name of this container for logging messsages

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