org.zkoss.idom.util

Class IDOMs

java.lang.Object

org.zkoss.idom.util.IDOMs

public class IDOMs
extends Object

The iDOM relevant utilities.

Author:

tomyeh

See Also:

Item, Group

Constructor Summary

Constructors

Constructor and Description
IDOMs()

Method Summary

Modifier and Type	Method and Description
static boolean	checkVersion(Document doc, URL url) Returns whether the loaded document's version is correct.
static void	dumpTree(Group group) Print a readable tree of the specified group to System.out.
static void	dumpTree(PrintStream s, Group group) Print a readable tree of the specified group to the specified stream.
static void	dumpTree(PrintWriter s, Group group) Print a readable tree of the specified group to the specified writer.
static Element	findElement(List elems, String name) Returns the first element whose sub-element called "name" has the same content as the name argument, or null if not found.
static void	format(Element e) Formats the specified element for better readability by adding white spaces.
static Element	getFirstElement(Group group) Returns the first child element, or null if no child element at all.
static String	getRequiredAttributeValue(Element e, String attrnm) Returns the required attribute value.
static Element	getRequiredElement(Element e, String elemnm) Returns the required element.
static String	getRequiredElementValue(Element e, String elemnm) Returns the required element value.
static Map<String,String>	parseParams(Element elm, String type, String name, String value) Parses a tree of parameter elements into a map.
static void	setContents(Collection<Element> elems, Object val) Set the contents of elements.
static Object	toContents(Object obj) Converts elements to their contents if the giving object is an element or an array or a collection of elements.
static String	toString(Document doc) Transforms a document to a string.

Methods inherited from class java.lang.Object

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

Constructor Detail

IDOMs

public IDOMs()

Method Detail

getRequiredElement

public static final Element getRequiredElement(Element e,
                                               String elemnm)
                                        throws IllegalSyntaxException

Returns the required element.

Parameters:

elemnm - the element name

Throws:

IllegalSyntaxException

getRequiredElementValue

public static final String getRequiredElementValue(Element e,
                                                   String elemnm)
                                            throws IllegalSyntaxException

Returns the required element value.

Note: the returned value may be an empty string (if the element contains no text at all).

Throws:

IllegalSyntaxException - if the element is not found

getRequiredAttributeValue

public static final String getRequiredAttributeValue(Element e,
                                                     String attrnm)
                                              throws IllegalSyntaxException

Returns the required attribute value.

Throws:

IllegalSyntaxException - if the element is not found

getFirstElement

public static final Element getFirstElement(Group group)

Returns the first child element, or null if no child element at all.

findElement

public static final Element findElement(List elems,
                                        String name)

Returns the first element whose sub-element called "name" has the same content as the name argument, or null if not found.

Parameters:

elems - a list of elements to look for the specified name

parseParams

public static final Map<String,String> parseParams(Element elm,
                                                   String type,
                                                   String name,
                                                   String value)

Parses a tree of parameter elements into a map.

The tree of parameter elements is as follows.

 <type>
   <name>any</name>
   <vaue>any</vaue>
 </type>

Returns:

the map after parsed (never null). An empty map is returned if no parameter is defined. The map is in the same order of the element tree.

format

public static void format(Element e)

Formats the specified element for better readability by adding white spaces.

toContents

public static final Object toContents(Object obj)

Converts elements to their contents if the giving object is an element or an array or a collection of elements. One item of an collection might be another collection or array.

setContents

public static final void setContents(Collection<Element> elems,
                                     Object val)

Set the contents of elements. The val argument could be an array and a collection, and each item will be assigned to each of the list one-by-one.

Unlike toContents(java.lang.Object), it handles only a collection of elements -- all items must be elements.

Parameters:

elems - the collection of elements

val - the value which could be an object, an array or a collection

toString

public static final String toString(Document doc)
                             throws TransformerConfigurationException,
                                    TransformerException

Transforms a document to a string. The string is XML correct.

Throws:

TransformerConfigurationException

TransformerException

dumpTree

public static final void dumpTree(Group group)

Print a readable tree of the specified group to System.out. It is for debug purpose and the generated format is not XML. To generate XML, uses Transformer or toString(org.zkoss.idom.Document).

See Also:

toString(org.zkoss.idom.Document)

dumpTree

public static final void dumpTree(PrintStream s,
                                  Group group)

Print a readable tree of the specified group to the specified stream. It is for debug purpose and the generated format is not XML. To generate XML, uses Transformer or toString(org.zkoss.idom.Document).

See Also:

toString(org.zkoss.idom.Document)

dumpTree

public static final void dumpTree(PrintWriter s,
                                  Group group)

Print a readable tree of the specified group to the specified writer. It is for debug purpose and the generated format is not XML. To generate XML, uses Transformer or toString(org.zkoss.idom.Document).

See Also:

toString(org.zkoss.idom.Document)

checkVersion

public static boolean checkVersion(Document doc,
                                   URL url)
                            throws Exception

Returns whether the loaded document's version is correct.

It assumes the version info is specified in the document in the following format:

<version>
        <version-class>org.zkoss.zul.Version</version-class>
        <version-uid>3.0.0</version-uid>
</version>

Note: it returns true if the version info is not found.

Parameters:

doc - the document to check

url - the URL used to show the readable message if the version doesn't match

Throws:

Exception

Since:

3.0.0