XmlObj.employees.employee[1].name.XmlText in Java

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XmlObj.employees.employee[1].name.XmlText
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Figure 30-6: The name node.
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This method of accessing nodes is known as short form, where you use the node s name to access the node. If you don t know the name of the node ahead of time, however, you can use long form to access the node, as follows:
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XmlObj.XmlRoot.XmlChildren[1].XmlChildren[2].XmlText
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Long-form notation references nodes by their position relative to the root node rather than by a hierarchy of named nodes. We prefer short-form notation wherever possible because it s easier to understand if you re familiar with the names of the XML nodes, and we re always familiar with the data structures that we re programming. And you can mix the two; in the following example, we re using both in the same node reference:
XmlObj.XmlRoot.employee[1].XmlChildren[2].XmlText
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Accessing attributes is similar to accessing elements. A node may contain any number of attributes, which are simply key-value pairs. The collection of a node s attributes is contained in a structure named XmlAttributes, so you can use associative array notation to obtain the value of an attribute. In the following code, for example, you re accessing the id attribute of the first employee element:
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XmlObj.employees.employee[1].XmlAttributes[ id ]
Make certain that you re familiar with the syntax for accessing XML nodes before continuing with this chapter.
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Manipulating an XML object
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The preceding section shows you how to access nodes in an XML object, but what about adding and modifying nodes Functions for working with XML fall into two categories: native XML functions and array and structure functions.
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In the section XML documents vs. XML objects, earlier in this chapter, you learn how to create a new XML object by using CFXML or XmlParse(), both of which use an existing XML document to create an XML object. You can also create a blank XML object by using XmlNew(), as follows:
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<cfset NewXmlObj = XmlNew()>
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After you have an XML object (regardless of how it was created), you can add elements to the object by using XmlElemNew(). Your first step in creating a completely new XML object is to create a root element, as follows:
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<cfset NewRootElem = XmlElemNew(NewXmlObj, myRootElement )>
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30 Integrating ColdFusion MX with XML and WDDX
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After you create this root element, you add it to the XML object as follows:
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<cfset NewXmlObj.XmlRoot = NewRootElem>
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After you have a root element in your XML object, you can create child elements under the root. In the following example, you create a child element named myChildElement:
<cfset NewChildElem = XmlElemNew(NewXmlObj, myChildElement )>
Then you add the child element to your XML object as follows:
<cfset NewXmlObj.myRootElement.XmlChildren[1] = NewChildElem>
Finally, you set the XmlText value of the child element to Billy , as follows:
<cfset NewXmlObj.myRootElement.myChildElement.XmlText = Billy >
As you would expect, you can get the value back out by using the same notation, as follows:
<cfoutput>#NewXmlObj.myRootElement.myChildElement.XmlText#</cfoutput>
You can get the XML from an object by using the ToString() function as follows:
<cfoutput>#ToString(NewXmlObj)#</cfoutput>
The output of ToString() looks as follows:
< xml version= 1.0 encoding= UTF-8 > <myRootElement><myChildElement>Billy</myChildElement></myRootElement>
Notice that as with WDDX, ToString() doesn t put any white space between tags. Another native XML function XmlChildPos() helps if you have heterogeneous children (in other words, child elements of different names), as in Listing 30-8.
Listing 30-8: An XML packet with heterogeneous children
< xml version= 1.0 encoding= UTF-8 > <employee> <ssn>583-61-9274</ssn> <name>Herman Johnson</name> <responsibility>Programming</responsibility> <responsibility>Writing status reports</responsibility> <responsibility>Making coffee</responsibility> <responsibility>Sucking up to the boss</responsibility> </employee>
Say that you want to add an element between the second and third responsibility elements. You know that you can access the third responsibility element as follows:
XmlObj.employee.responsibility[3]
But to add a new element, you need to know the location of the third responsibility element within <employee> s XmlChildren array. You can get this index by using XmlChildPos(), as shown in Listing 30-9.
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Listing 30-9: Adding another responsibility to the employee object
<cfxml variable= XmlObj > <employee> <ssn>583-61-9274</ssn> <name>Herman Johnson</name> <responsibility>Programming</responsibility> <responsibility>Writing status reports</responsibility> <responsibility>Making coffee</responsibility> <responsibility>Sucking up to the boss</responsibility> </employee> </cfxml> <cfdump var= #XmlObj# label= Original Object > <cfset ElemPos = XmlChildPos(XmlObj.employee, responsibility , 3)> <cfset NewElement = XmlElemNew(XmlObj, responsibility )> <cfset NewElement.XmlText = Making copies > <cfset success = ArrayInsertAt(XmlObj.employee.XmlChildren, ElemPos, NewElement)> <cfdump var= #XmlObj# label= New Object >
Running Listing 30-9 produces the output shown in Figure 30-7.
Figure 30-7: Using XmlChildPos().