org.zkoss.idom
Interface Item

All Superinterfaces:

java.lang.Cloneable

All Known Subinterfaces:

Group

All Known Implementing Classes:

AbstractGroup, AbstractItem, AbstractTextual, Attribute, Binary, CData, Comment, DocType, Document, Element, EntityReference, ProcessingInstruction, Text

public interface Item
extends java.lang.Cloneable

Represents an item (aka., node) of a iDOM tree. A iDOM tree is not necessary also a W3C/DOM tree. However, in iDOM's implement, it is because all Vertices also implement related interface, such as Node.

Some vertices, currently only Element, might support attributes by implementing Attributable.

Due to the implementation of both Item and W3C/DOM's interfaces, many methods seem redudant (e.g., parent vs. getParentNode, and children vs. getChildNodes). Caller could use them interchangeably . However, it is suggested to use Item's API instead of Node's, because, like JDOM, Item's API is based Java collection classes and more consistent (from my point of view). The W3C/DOM API is used to work with utilities that work only with W3C/DOM.

Be carefult that some methods look similar, but behave different. Refer to package.html.

Author:

tomyeh

See Also:

Attributable, Binable

Field Summary

static int	FIND_BY_PREFIX Indicates the namespace argument is a prefix rather than URI.
static int	FIND_BY_REGEX Indicates the searching is based on regular expression (upon the name argument).
static int	FIND_BY_TAGNAME Indicates the name argument is a tag name rather than local name.
static int	FIND_IGNORE_CASE Indicates the searching is case insensitive.
static int	FIND_RECURSIVE Indicates the searching looks for all descendants.

Method Summary

java.lang.Object	clone() Clones this item.
Item	detach() Detach this item from its parent.
Document	getDocument() Gets the document that owns this item.
Locator	getLocator() Gets the locator of this item.
java.lang.String	getName() Gets the name of the item.
Group	getParent() Gets the parent item.
java.lang.String	getText() Gets the text of this item, or null if it is neither Textual nor Element.
void	setLocator(Locator loc) Sets the locator of this item.
void	setName(java.lang.String name) Sets the name of the item.
void	setParent(Group parent) Sets the parent item.
void	setText(java.lang.String obj) Sets the text of this item.

Field Detail

FIND_BY_REGEX

static final int FIND_BY_REGEX

Indicates the searching is based on regular expression (upon the name argument). If not specified, exact-match is required.

See Also:

Constant Field Values

FIND_IGNORE_CASE

static final int FIND_IGNORE_CASE

Indicates the searching is case insensitive. This flag is ignored if FIND_BY_REGEX is specified.

See Also:

Constant Field Values

FIND_BY_TAGNAME

static final int FIND_BY_TAGNAME

Indicates the name argument is a tag name rather than local name.

See Also:

Constant Field Values

FIND_BY_PREFIX

static final int FIND_BY_PREFIX

Indicates the namespace argument is a prefix rather than URI.

See Also:

Constant Field Values

FIND_RECURSIVE

static final int FIND_RECURSIVE

Indicates the searching looks for all descendants. If not specified, only the children (not children of children) is searched.

See Also:

Constant Field Values

Method Detail

getName

java.lang.String getName()

Gets the name of the item. For vertices that support namespace (implements Namespaceable), it is the same as getTagName.

See Also:

Namespaceable.getTagName()

setName

void setName(java.lang.String name)

Sets the name of the item. For vertices that support namespace (implements Namespaceable), it is the same as setTagName.

Throws:

DOMException - with NOT_SUPPORTED_ERR if this item doesn't allow to change the name, e.g., Document and DocType

See Also:

Namespaceable.setTagName(java.lang.String)

getText

java.lang.String getText()

Gets the text of this item, or null if it is neither Textual nor Element. For Element, the text is the catenation of all its textual children, including Text, CDATA, and Binary.

Besides String-type value, some item, e.g., Binary, allows any type of objects. Caller could test whether a item implements the Binable interface, and use Binable.getValue instead. For binable vertices, getText is actually getValue().toString().

The returned value is neither trimmed nor normalized.

setText

void setText(java.lang.String obj)

Sets the text of this item.

Throws:

DOMException - with NOT_SUPPORTED_ERR if this item doesn't allow to change the value, e.g., Document and Element

getDocument

Document getDocument()

Gets the document that owns this item. The owning document is the first document in its ancestor. For DOM, the document can only be the root, so the owning documents of vertices in a DOM tree are all the same.

detach

Item detach()

Detach this item from its parent.

Because each item can belong to at most one parent at a time, it is important to detach it first, before added to another tree -- even if it is the same tree/parent.

It has the similar effect as:
getParent().getChildren().remove(this).

Naming reason: we don't call this method as getChildren() to be compatible with the naming style of Attributable.attributes -- which is limited to org.w3c.dom.Attr.getAttributes. Also, it doesn't have the setter and it is "live", so it 'seem' better to call it getChildren().

Returns:

this item

getParent

Group getParent()

Gets the parent item.

getLocator

Locator getLocator()

Gets the locator of this item.

Returns:

the locator; null if not available (default)

setLocator

void setLocator(Locator loc)

Sets the locator of this item.

Unlike other methods, it won't change the modification flag.

Parameters:

loc - the locator; null if not available

clone

java.lang.Object clone()

Clones this item. Unlike other objects, it does a deep cloning.

Since:

5.0,8

setParent

void setParent(Group parent)

Sets the parent item.

DO NOT call this method. It is used internally. Instead, use detach or thru getChildren().