| IteratorGeneratorTag.java | Class |
NOTE: JSP-TAG
Generate an iterator based on the val attribute supplied.
NOTE: The generated iterator will ALWAYS be pushed into the top of the stack, and poped
at the end of the tag.
- val* (Object) - the source to be parsed into an iterator
- count (Object) - the max number (Integer, Float, Double, Long, String) entries to be in the iterator
- separator (String) - the separator to be used in separating the val into entries of the iterator
- id (String) - the id to store the resultant iterator into page context, if such id is supplied
- converter (Object) - the converter (must extends off IteratorGenerator.Converter interface) to convert the String entry parsed from val into an object
Example One:
Generate a simple iterator
<ww:generator val="%{'aaa,bbb,ccc,ddd,eee'}">
<ww:iterator>
<ww:property /><br/>
</ww:iterator>
</ww:generator>
This generates an iterator and print it out using the iterator tag.
Example Two:
Generate an iterator with count attribute
<ww:generator val="%{'aaa,bbb,ccc,ddd,eee'}" count="3">
<ww:iterator>
<ww:property /><br/>
</ww:iterator>
</ww:generator>
This generates an iterator, but only 3 entries will be available in the iterator
generated, namely aaa, bbb and ccc respectively because count attribute is set to 3
Example Three:
Generate an iterator with id attribute
<ww:generator val="%{'aaa,bbb,ccc,ddd,eee'}" count="4" separator="," id="myAtt" />
<%
Iterator i = (Iterator) pageContext.getAttribute("myAtt");
while(i.hasNext()) {
String s = (String) i.next(); %>
<%=s%> <br/>
<% }
%>
This generates an iterator and put it in the PageContext under the key as specified
by the id attribute.
Example Four:
Generate an iterator with comparator attribute
<ww:generator val="%{'aaa,bbb,ccc,ddd,eee'}" converter="%{myConverter}">
<ww:iterator>
<ww:property /><br/>
</ww:iterator>
</ww:generator>
public class GeneratorTagAction extends ActionSupport {
....
public Converter getMyConverter() {
return new Converter() {
public Object convert(String value) throws Exception {
return "converter-"+value;
}
};
}
...
}
This will generate an iterator with each entries decided by the converter supplied. |