org.apache.catalina.util
Class ParameterMap<K,V>

java.lang.Object
  java.util.AbstractMap<K,V>
      java.util.HashMap<K,V>
          java.util.LinkedHashMap<K,V>
              org.apache.catalina.util.ParameterMap<K,V>

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.util.Map<K,V>

public final class ParameterMap<K,V>
extends java.util.LinkedHashMap<K,V>

Extended implementation of HashMap that includes a locked property. This class can be used to safely expose Catalina internal parameter map objects to user classes without having to clone them in order to avoid modifications. When first created, a ParmaeterMap instance is not locked.

Author:

Craig R. McClanahan

See Also:

Serialized Form

ParameterMap

public ParameterMap()

Construct a new, empty map with the default initial capacity and load factor.

ParameterMap

public ParameterMap(int initialCapacity)

Construct a new, empty map with the specified initial capacity and default load factor.

Parameters:

initialCapacity - The initial capacity of this map

ParameterMap

public ParameterMap(int initialCapacity,
                    float loadFactor)

Construct a new, empty map with the specified initial capacity and load factor.

Parameters:

initialCapacity - The initial capacity of this map

loadFactor - The load factor of this map

ParameterMap

public ParameterMap(java.util.Map<K,V> map)

Construct a new map with the same mappings as the given map.

Parameters:

map - Map whose contents are duplicated in the new map

isLocked

public boolean isLocked()

Return the locked state of this parameter map.

setLocked

public void setLocked(boolean locked)

Set the locked state of this parameter map.

Parameters:

locked - The new locked state

clear

public void clear()

Remove all mappings from this map.

Specified by:

clear in interface java.util.Map<K,V>

Overrides:

clear in class java.util.LinkedHashMap<K,V>

Throws:

java.lang.IllegalStateException - if this map is currently locked

put

public V put(K key,
             V value)

Associate the specified value with the specified key in this map. If the map previously contained a mapping for this key, the old value is replaced.

Specified by:

put in interface java.util.Map<K,V>

Overrides:

put in class java.util.HashMap<K,V>

Parameters:

key - Key with which the specified value is to be associated

value - Value to be associated with the specified key

Returns:

The previous value associated with the specified key, or null if there was no mapping for key

Throws:

java.lang.IllegalStateException - if this map is currently locked

putAll

public void putAll(java.util.Map<? extends K,? extends V> map)

Copy all of the mappings from the specified map to this one. These mappings replace any mappings that this map had for any of the keys currently in the specified Map.

Specified by:

putAll in interface java.util.Map<K,V>

Overrides:

putAll in class java.util.HashMap<K,V>

Parameters:

map - Mappings to be stored into this map

Throws:

java.lang.IllegalStateException - if this map is currently locked

remove

public V remove(java.lang.Object key)

Remove the mapping for this key from the map if present.

Specified by:

remove in interface java.util.Map<K,V>

Overrides:

remove in class java.util.HashMap<K,V>

Parameters:

key - Key whose mapping is to be removed from the map

Returns:

The previous value associated with the specified key, or null if there was no mapping for that key

Throws:

java.lang.IllegalStateException - if this map is currently locked