org.jdom

Class Document

Implemented Interfaces:
Cloneable, Parent, Serializable

public class Document
extends java.lang.Object
implements Parent

An XML document. Methods allow access to the root element as well as the DocType and other document-level information.
Version:
$Revision: 1.85 $, $Date: 2007/11/10 05:28:58 $
Authors:
Brett McLaughlin
Jason Hunter
Jools Enticknap
Bradley S. Huffman

Field Summary

protected String
baseURI
See http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/core.html#baseURIs-Considerations

Constructor Summary

Document()
Creates a new empty document.
Document(List content)
This will create a new Document, with the supplied list of content, and a DocType declaration only if the content contains a DocType instance.
Document(Element rootElement)
This will create a new Document, with the supplied Element as the root element, and no DocType declaration.
Document(Element rootElement, DocType docType)
This will create a new Document, with the supplied Element as the root element and the supplied DocType declaration.
Document(Element rootElement, DocType docType, String baseURI)
This will create a new Document, with the supplied Element as the root element, the supplied DocType declaration, and the specified base URI.

Method Summary

Document
addContent(Collection c)
Appends all children in the given collection to the end of the content list.
Document
addContent(int index, Collection c)
Inserts the content in a collection into the content list at the given index.
Document
addContent(int index, Content child)
Inserts the child into the content list at the given index.
Document
addContent(Content child)
Appends the child to the end of the content list.
Object
clone()
This will return a deep clone of this Document.
List
cloneContent()
Returns a list containing detached clones of this parent's content list.
Element
detachRootElement()
Detach the root Element from this document.
boolean
equals(Object ob)
This tests for equality of this Document to the supplied Object.
String
getBaseURI()
Returns the URI from which this document was loaded, or null if this is not known.
List
getContent()
This will return all content for the Document.
Content
getContent(int index)
Returns the child at the given index.
List
getContent(Filter filter)
Return a filtered view of this Document's content.
int
getContentSize()
Returns the number of children in this parent's content list.
Iterator
getDescendants()
Returns an iterator that walks over all descendants in document order.
Iterator
getDescendants(Filter filter)
Returns an iterator that walks over all descendants in document order applying the Filter to return only elements that match the filter rule.
DocType
getDocType()
This will return the DocType declaration for this Document, or null if none exists.
Document
getDocument()
Parent
getParent()
Return this parent's parent, or null if this parent is currently not attached to another parent.
Object
getProperty(String id)
Returns the object associated with this document under the given "id" string, or null if there is no binding or if the binding explicitly stored a null value.
Element
getRootElement()
This will return the root Element for this Document
boolean
hasRootElement()
This will return true if this document has a root element, false otherwise.
int
hashCode()
This returns the hash code for this Document.
int
indexOf(Content child)
Returns the index of the supplied child in the content list, or -1 if not a child of this parent.
List
removeContent()
Removes all child content from this parent.
Content
removeContent(int index)
Removes and returns the child at the given index, or returns null if there's no such child.
boolean
removeContent(Content child)
Removes a single child node from the content list.
List
removeContent(Filter filter)
Remove all child content from this parent matching the supplied filter.
void
setBaseURI(String uri)
Sets the effective URI from which this document was loaded, and against which relative URLs in this document will be resolved.
Document
setContent(Collection newContent)
This sets the content of the Document.
Document
setContent(int index, Collection collection)
Replace the child at the given index whith the supplied collection.
Document
setContent(int index, Content child)
Document
setContent(Content child)
Set this document's content to be the supplied child.
Document
setDocType(DocType docType)
This will set the DocType declaration for this Document.
void
setProperty(String id, Object value)
Assigns an arbitrary object to be associated with this document under the given "id" string.
Document
setRootElement(Element rootElement)
This sets the root Element for the Document.
String
toString()
This returns a String representation of the Document, suitable for debugging.

Field Details

baseURI

protected String baseURI
See http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/core.html#baseURIs-Considerations

Constructor Details

Document

public Document()
Creates a new empty document. A document must have a root element, so this document will not be well-formed and accessor methods will throw an IllegalStateException if this document is accessed before a root element is added. This method is most useful for build tools.

Document

public Document(List content)
This will create a new Document, with the supplied list of content, and a DocType declaration only if the content contains a DocType instance. A null list is treated the same as the no-arg constructor.
Parameters:
content - List of starter content

Document

public Document(Element rootElement)
This will create a new Document, with the supplied Element as the root element, and no DocType declaration.
Parameters:
rootElement - Element for document root

Document

public Document(Element rootElement,
                DocType docType)
This will create a new Document, with the supplied Element as the root element and the supplied DocType declaration.
Parameters:
rootElement - Element for document root.
docType - DocType declaration.

Document

public Document(Element rootElement,
                DocType docType,
                String baseURI)
This will create a new Document, with the supplied Element as the root element, the supplied DocType declaration, and the specified base URI.
Parameters:
rootElement - Element for document root.
docType - DocType declaration.
baseURI - the URI from which this doucment was loaded.

Method Details

addContent

public Document addContent(Collection c)
Appends all children in the given collection to the end of the content list. In event of an exception during add the original content will be unchanged and the objects in the supplied collection will be unaltered.
Parameters:
c - collection to append
Returns:
the document on which the method was called

addContent

public Document addContent(int index,
                           Collection c)
Inserts the content in a collection into the content list at the given index. In event of an exception the original content will be unchanged and the objects in the supplied collection will be unaltered.
Parameters:
index - location for adding the collection
c - collection to insert
Returns:
the parent on which the method was called

addContent

public Document addContent(int index,
                           Content child)
Inserts the child into the content list at the given index.
Parameters:
index - location for adding the collection
child - child to insert
Returns:
the parent on which the method was called

addContent

public Document addContent(Content child)
Appends the child to the end of the content list.
Parameters:
child - child to append to end of content list
Returns:
the document on which the method was called

clone

public Object clone()
This will return a deep clone of this Document.
Specified by:
clone in interface Parent
Returns:
Object clone of this Document

cloneContent

public List cloneContent()
Returns a list containing detached clones of this parent's content list.
Specified by:
cloneContent in interface Parent
Returns:
list of cloned child content

detachRootElement

public Element detachRootElement()
Detach the root Element from this document.
Returns:
removed root Element

equals

public final boolean equals(Object ob)
This tests for equality of this Document to the supplied Object.
Parameters:
ob - Object to compare to
Returns:
boolean whether the Document is equal to the supplied Object

getBaseURI

public final String getBaseURI()
Returns the URI from which this document was loaded, or null if this is not known.
Returns:
the base URI of this document

getContent

public List getContent()
This will return all content for the Document. The returned list is "live" in document order and changes to it affect the document's actual content.

Sequential traversal through the List is best done with a Iterator since the underlying implement of List.size() may require walking the entire list.

Specified by:
getContent in interface Parent
Returns:
List - all Document content

getContent

public Content getContent(int index)
Returns the child at the given index.
Specified by:
getContent in interface Parent
Parameters:
index - location of desired child
Returns:
child at the given index

getContent

public List getContent(Filter filter)
Return a filtered view of this Document's content.

Sequential traversal through the List is best done with a Iterator since the underlying implement of List.size() may require walking the entire list.

Specified by:
getContent in interface Parent
Parameters:
filter - Filter to apply
Returns:
List - filtered Document content

getContentSize

public int getContentSize()
Specified by:
getContentSize in interface Parent
Returns:
number of children

getDescendants

public Iterator getDescendants()
Returns an iterator that walks over all descendants in document order.
Specified by:
getDescendants in interface Parent
Returns:
an iterator to walk descendants

getDescendants

public Iterator getDescendants(Filter filter)
Returns an iterator that walks over all descendants in document order applying the Filter to return only elements that match the filter rule. With filters you can match only Elements, only Comments, Elements or Comments, only Elements with a given name and/or prefix, and so on.
Specified by:
getDescendants in interface Parent
Parameters:
filter - filter to select which descendants to see
Returns:
an iterator to walk descendants within a filter

getDocType

public DocType getDocType()
This will return the DocType declaration for this Document, or null if none exists.
Returns:
DocType - the DOCTYPE declaration.

getDocument

public Document getDocument()
Specified by:
getDocument in interface Parent

getParent

public Parent getParent()
Return this parent's parent, or null if this parent is currently not attached to another parent. This is the same method as in Content but also added to Parent to allow more easy up-the-tree walking.
Specified by:
getParent in interface Parent
Returns:
this parent's parent or null if none

getProperty

public Object getProperty(String id)
Returns the object associated with this document under the given "id" string, or null if there is no binding or if the binding explicitly stored a null value.
Parameters:
id - the id of the stored object to return
Returns:
the object associated with the given id

getRootElement

public Element getRootElement()
This will return the root Element for this Document
Returns:
Element - the document's root element

hasRootElement

public boolean hasRootElement()
This will return true if this document has a root element, false otherwise.
Returns:
true if this document has a root element, false otherwise.

hashCode

public final int hashCode()
This returns the hash code for this Document.
Returns:
int hash code

indexOf

public int indexOf(Content child)
Returns the index of the supplied child in the content list, or -1 if not a child of this parent.
Specified by:
indexOf in interface Parent
Parameters:
child - child to search for
Returns:
index of child, or -1 if not found

removeContent

public List removeContent()
Removes all child content from this parent.
Specified by:
removeContent in interface Parent
Returns:
list of the old children detached from this parent

removeContent

public Content removeContent(int index)
Removes and returns the child at the given index, or returns null if there's no such child.
Specified by:
removeContent in interface Parent
Parameters:
index - index of child to remove
Returns:
detached child at given index or null if no

removeContent

public boolean removeContent(Content child)
Removes a single child node from the content list.
Specified by:
removeContent in interface Parent
Parameters:
child - child to remove
Returns:
whether the removal occurred

removeContent

public List removeContent(Filter filter)
Remove all child content from this parent matching the supplied filter.
Specified by:
removeContent in interface Parent
Parameters:
filter - filter to select which content to remove
Returns:
list of the old children detached from this parent

setBaseURI

public final void setBaseURI(String uri)
Sets the effective URI from which this document was loaded, and against which relative URLs in this document will be resolved.
Parameters:
uri - the base URI of this document

setContent

public Document setContent(Collection newContent)
This sets the content of the Document. The supplied List should contain only objects of type Element, Comment, and ProcessingInstruction.

When all objects in the supplied List are legal and before the new content is added, all objects in the old content will have their parentage set to null (no parent) and the old content list will be cleared. This has the effect that any active list (previously obtained with a call to getContent) will also change to reflect the new content. In addition, all objects in the supplied List will have their parentage set to this document, but the List itself will not be "live" and further removals and additions will have no effect on this document content. If the user wants to continue working with a "live" list, then a call to setContent should be followed by a call to getContent to obtain a "live" version of the content.

Passing a null or empty List clears the existing content.

In event of an exception the original content will be unchanged and the objects in the supplied content will be unaltered.

Parameters:
newContent - List of content to set
Returns:
this document modified

setContent

public Document setContent(int index,
                           Collection collection)
Replace the child at the given index whith the supplied collection.

In event of an exception the original content will be unchanged and the content in the supplied collection will be unaltered.

Parameters:
index - - index of child to replace.
collection - - collection of content to add.
Returns:
object on which the method was invoked

setContent

public Document setContent(int index,
                           Content child)

setContent

public Document setContent(Content child)
Set this document's content to be the supplied child.

If the supplied child is legal content for a Document and before it is added, all content in the current content list will be cleared and all current children will have their parentage set to null.

This has the effect that any active list (previously obtained with a call to one of the getContent methods will also change to reflect the new content. In addition, all content in the supplied collection will have their parentage set to this Document. If the user wants to continue working with a "live" list of this Document's child, then a call to setContent should be followed by a call to one of the getContent methods to obtain a "live" version of the children.

Passing a null child clears the existing content.

In event of an exception the original content will be unchanged and the supplied child will be unaltered.

Parameters:
child - new content to replace existing content
Returns:
the parent on which the method was called

setDocType

public Document setDocType(DocType docType)
This will set the DocType declaration for this Document. Note that a DocType can only be attached to one Document. Attempting to set the DocType to a DocType object that already belongs to a Document will result in an IllegalAddException being thrown.
Parameters:
docType - DocType declaration.
Returns:
object on which the method was invoked

setProperty

public void setProperty(String id,
                        Object value)
Assigns an arbitrary object to be associated with this document under the given "id" string. Null values are permitted. Strings beginning with "http://www.jdom.org/ are reserved for JDOM use.
Parameters:
id - the id of the stored object
value - the object to store

setRootElement

public Document setRootElement(Element rootElement)
This sets the root Element for the Document. If the document already has a root element, it is replaced.
Parameters:
rootElement - Element to be new root.
Returns:
Document - modified Document.

toString

public String toString()
Returns:
String - information about the Document

Copyright B) 2007 Jason Hunter, Brett McLaughlin. All Rights Reserved.