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public interface Memento
Interface to a memento used for saving the important state of an object in a form that can be persisted in the file system.
Mementos were designed with the following requirements in mind:
Mementos meet these requirements by providing support for storing a mapping of arbitrary string keys to primitive values, and by allowing mementos to have other mementos as children (arranged into a tree). A robust external storage format based on XML is used.
The key for an attribute may be any alpha numeric value. However, the
value of TAG_ID
is reserved for internal use.
This interface is not intended to be implemented or extended by clients.
Field Summary | |
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static java.lang.String |
TAG_ID
Special reserved key used to store the memento id (value "org.eclipse.ui.id" ). |
Method Summary | |
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Memento |
createChild(java.lang.String type)
Creates a new child of this memento with the given type. |
Memento |
createChild(java.lang.String type,
java.lang.String id)
Creates a new child of this memento with the given type and id. |
java.lang.Boolean |
getBoolean(java.lang.String key)
Returns the boolean value of the given key. |
Memento |
getChild(java.lang.String type)
Returns the first child with the given type id. |
Memento[] |
getChildren(java.lang.String type)
Returns all children with the given type id. |
java.lang.Float |
getFloat(java.lang.String key)
Returns the floating point value of the given key. |
java.lang.String |
getID()
Returns the id for this memento. |
java.lang.Integer |
getInteger(java.lang.String key)
Returns the integer value of the given key. |
java.lang.String |
getString(java.lang.String key)
Returns the string value of the given key. |
java.lang.String |
getTextData()
Returns the data of the Text node of the memento. |
void |
putBoolean(java.lang.String key,
boolean value)
Sets the value of the given key to the given boolean. |
void |
putFloat(java.lang.String key,
float value)
Sets the value of the given key to the given floating point number. |
void |
putInteger(java.lang.String key,
int value)
Sets the value of the given key to the given integer. |
void |
putMemento(Memento memento)
Copy the attributes and children from memento
to the receiver. |
void |
putString(java.lang.String key,
java.lang.String value)
Sets the value of the given key to the given string. |
void |
putTextData(java.lang.String data)
Sets the memento's Text node to contain the given data. |
Field Detail |
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static final java.lang.String TAG_ID
"org.eclipse.ui.id"
).
getID()
,
Constant Field ValuesMethod Detail |
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Memento createChild(java.lang.String type)
The getChild
and getChildren
methods
are used to retrieve children of a given type.
type
- the type
getChild(java.lang.String)
,
getChildren(java.lang.String)
Memento createChild(java.lang.String type, java.lang.String id)
TAG_ID
) and can be retrieved using getId
.
The getChild
and getChildren
methods are
used to retrieve children of a given type.
type
- the typeid
- the child id
getID()
Memento getChild(java.lang.String type)
type
- the type id
Memento[] getChildren(java.lang.String type)
type
- the type id
java.lang.Float getFloat(java.lang.String key)
key
- the key
null
if the key was not found or was
found but was not a floating point numberjava.lang.String getID()
null
if nonecreateChild(String, String)
java.lang.Integer getInteger(java.lang.String key)
key
- the key
null
if the key was not found or was
found but was not an integerjava.lang.Boolean getBoolean(java.lang.String key)
key
- the key
null
if the key was not found or was
found but was not an integerjava.lang.String getString(java.lang.String key)
key
- the key
null
if the key was not foundjava.lang.String getTextData()
null
if the memento has no Text node.void putFloat(java.lang.String key, float value)
key
- the keyvalue
- the valuevoid putInteger(java.lang.String key, int value)
key
- the keyvalue
- the valuevoid putMemento(Memento memento)
memento
to the receiver.
memento
- the Memento to be copied.void putString(java.lang.String key, java.lang.String value)
key
- the keyvalue
- the valuevoid putBoolean(java.lang.String key, boolean value)
key
- the keyvalue
- the valuevoid putTextData(java.lang.String data)
data
- the data to be placed on the Text node
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