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Eclipse Platform
Release 3.0

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org.eclipse.ui
Class XMLMemento

java.lang.Object
  org.eclipse.ui.XMLMemento

All Implemented Interfaces:

IMemento

public final class XMLMemento

extends Object

implements IMemento

This class represents the default implementation of the IMemento interface.

This class is not intended to be extended by clients.

See Also:

IMemento

Field Summary

Fields inherited from interface org.eclipse.ui.IMemento

TAG_ID

Constructor Summary

XMLMemento(Document document, Element element)
Creates a memento for the specified document and element.

Method Summary

IMemento	copyChild(IMemento child)
IMemento	createChild(String type) Creates a new child of this memento with the given type.
IMemento	createChild(String type, String id) Creates a new child of this memento with the given type and id.
static XMLMemento	createReadRoot(Reader reader) Creates a Document from the Reader and returns a memento on the first Element for reading the document.
static XMLMemento	createReadRoot(Reader reader, String baseDir) Creates a Document from the Reader and returns a memento on the first Element for reading the document.
static XMLMemento	createWriteRoot(String type) Returns a root memento for writing a document.
IMemento	getChild(String type) Returns the first child with the given type id.
IMemento[]	getChildren(String type) Returns all children with the given type id.
Float	getFloat(String key) Returns the floating point value of the given key.
String	getID() Returns the id for this memento.
Integer	getInteger(String key) Returns the integer value of the given key.
String	getString(String key) Returns the string value of the given key.
String	getTextData() Returns the data of the Text node of the memento.
void	putFloat(String key, float f) Sets the value of the given key to the given floating point number.
void	putInteger(String key, int n) Sets the value of the given key to the given integer.
void	putMemento(IMemento memento) Copy the attributes and children from memento to the receiver.
void	putString(String key, String value) Sets the value of the given key to the given string.
void	putTextData(String data) Sets the memento's Text node to contain the given data.
void	save(Writer writer) Saves this memento's document current values to the specified writer.

Methods inherited from class java.lang.Object

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

Constructor Detail

XMLMemento

public XMLMemento(Document document,
                  Element element)

Creates a memento for the specified document and element.

Clients should use createReadRoot and createWriteRoot to create the initial memento on a document.

Parameters:

document - the document for the memento

element - the element node for the memento

Method Detail

createReadRoot

public static XMLMemento createReadRoot(Reader reader)
                                 throws WorkbenchException

Creates a Document from the Reader and returns a memento on the first Element for reading the document.

Same as calling createReadRoot(reader, null)

Parameters:

reader - the Reader used to create the memento's document

Returns:

a memento on the first Element for reading the document

Throws:

WorkbenchException - if IO problems, invalid format, or no element.

WorkbenchException

createReadRoot

public static XMLMemento createReadRoot(Reader reader,
                                        String baseDir)
                                 throws WorkbenchException

Creates a Document from the Reader and returns a memento on the first Element for reading the document.

Parameters:

reader - the Reader used to create the memento's document

baseDir - the directory used to resolve relative file names in the XML document. This directory must exist and include the trailing separator. The directory format, including the separators, must be valid for the platform. Can be null if not needed.

Returns:

a memento on the first Element for reading the document

Throws:

WorkbenchException - if IO problems, invalid format, or no element.

WorkbenchException

createWriteRoot

public static XMLMemento createWriteRoot(String type)

Returns a root memento for writing a document.

Parameters:

type - the element node type to create on the document

Returns:

the root memento for writing a document

createChild

public IMemento createChild(String type)

Description copied from interface: IMemento

Creates a new child of this memento with the given type.

The getChild and getChildren methods are used to retrieve children of a given type.

Specified by:

createChild in interface IMemento

Parameters:

type - the type

Returns:

a new child memento

See Also:

IMemento.getChild(java.lang.String), IMemento.getChildren(java.lang.String)

createChild

public IMemento createChild(String type,
                            String id)

Description copied from interface: IMemento

Creates a new child of this memento with the given type and id. The id is stored in the child memento (using a special reserved key, TAG_ID) and can be retrieved using getId.

The getChild and getChildren methods are used to retrieve children of a given type.

Specified by:

createChild in interface IMemento

Parameters:

type - the type

id - the child id

Returns:

a new child memento with the given type and id

See Also:

IMemento.getID()

copyChild

public IMemento copyChild(IMemento child)

getChild

public IMemento getChild(String type)

Description copied from interface: IMemento

Returns the first child with the given type id.

Specified by:

getChild in interface IMemento

Parameters:

type - the type id

Returns:

the first child with the given type

getChildren

public IMemento[] getChildren(String type)

Description copied from interface: IMemento

Returns all children with the given type id.

Specified by:

getChildren in interface IMemento

Parameters:

type - the type id

Returns:

the list of children with the given type

getFloat

public Float getFloat(String key)

Description copied from interface: IMemento

Returns the floating point value of the given key.

Specified by:

getFloat in interface IMemento

Parameters:

key - the key

Returns:

the value, or null if the key was not found or was found but was not a floating point number

getID

public String getID()

Description copied from interface: IMemento

Returns the id for this memento.

Specified by:

getID in interface IMemento

Returns:

the memento id, or null if none

See Also:

IMemento.createChild(java.lang.String,java.lang.String)

getInteger

public Integer getInteger(String key)

Description copied from interface: IMemento

Returns the integer value of the given key.

Specified by:

getInteger in interface IMemento

Parameters:

key - the key

Returns:

the value, or null if the key was not found or was found but was not an integer

getString

public String getString(String key)

Description copied from interface: IMemento

Returns the string value of the given key.

Specified by:

getString in interface IMemento

Parameters:

key - the key

Returns:

the value, or null if the key was not found

getTextData

public String getTextData()

Description copied from interface: IMemento

Returns the data of the Text node of the memento. Each memento is allowed only one Text node.

Specified by:

getTextData in interface IMemento

Returns:

the data of the Text node of the memento, or null if the memento has no Text node.

putFloat

public void putFloat(String key,
                     float f)

Description copied from interface: IMemento

Sets the value of the given key to the given floating point number.

Specified by:

putFloat in interface IMemento

Parameters:

key - the key

f - the value

putInteger

public void putInteger(String key,
                       int n)

Description copied from interface: IMemento

Sets the value of the given key to the given integer.

Specified by:

putInteger in interface IMemento

Parameters:

key - the key

n - the value

putMemento

public void putMemento(IMemento memento)

Description copied from interface: IMemento

Copy the attributes and children from memento to the receiver.

Specified by:

putMemento in interface IMemento

Parameters:

memento - the IMemento to be copied.

putString

public void putString(String key,
                      String value)

Description copied from interface: IMemento

Sets the value of the given key to the given string.

Specified by:

putString in interface IMemento

Parameters:

key - the key

value - the value

putTextData

public void putTextData(String data)

Description copied from interface: IMemento

Sets the memento's Text node to contain the given data. Creates the Text node if none exists. If a Text node does exist, it's current contents are replaced. Each memento is allowed only one text node.

Specified by:

putTextData in interface IMemento

Parameters:

data - the data to be placed on the Text node

save

public void save(Writer writer)
          throws IOException

Saves this memento's document current values to the specified writer.

Parameters:

writer - the writer used to save the memento's document

Throws:

IOException - if there is a problem serializing the document to the stream.