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Java Source Code / Java Documentation » J2EE » webwork 2.2.6 » com.opensymphony.webwork.components 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   com.opensymphony.webwork.components.Component
      com.opensymphony.webwork.components.MergeIterator

MergeIterator
public class MergeIterator extends Component implements UnnamedParametric(Code)

Component for MergeIteratorTag, which job is to merge iterators and successive call to the merged iterator will cause each merge iterator to have a chance to expose its element, subsequently next call will allow the next iterator to expose its element. Once the last iterator is done exposing its element, the first iterator is allowed to do so again (unless it is exhausted of entries).

Internally the task are delegated to MergeIteratorFilter

Example if there are 3 lists being merged, each list have 3 entries, the following will be the logic.

  1. Display first element of the first list
  2. Display first element of the second list
  3. Display first element of the third list
  4. Display second element of the first list
  5. Display second element of the second list
  6. Display second element of the third list
  7. Display third element of the first list
  8. Display thrid element of the second list
  9. Display third element of the thrid list
  • id (String) - the id where the resultant merged iterator will be stored in the stack's context
public class MergeIteratorTagAction extends ActionSupport { private List myList1; private List myList2; private List myList3; public List getMyList1() { return myList1; } public List getMyList2() { return myList2; } public List getMyList3() { return myList3; } public String execute() throws Exception { myList1 = new ArrayList(); myList1.add("1"); myList1.add("2"); myList1.add("3"); myList2 = new ArrayList(); myList2.add("a"); myList2.add("b"); myList2.add("c"); myList3 = new ArrayList(); myList3.add("A"); myList3.add("B"); myList3.add("C"); return "done"; } } <ww:merge id="myMergedIterator1"> <ww:param value="%{myList1}" /> <ww:param value="%{myList2}" /> <ww:param value="%{myList3}" /> </ww:merge> <ww:iterator value="%{#myMergedIterator1}"> <ww:property /> </ww:iterator> This wil generate "1aA2bB3cC".
author:
   tm_jee (tm_jee (at) yahoo.co.uk)
version:
   $Date: 2006-03-18 17:28:55 +0100 (Sat, 18 Mar 2006) $ $Id: MergeIterator.java 2468 2006-03-18 16:28:55Z rgielen $
See Also:   com.opensymphony.webwork.util.MergeIteratorFilter
See Also:   com.opensymphony.webwork.views.jsp.iterator.MergeIteratorTag



Constructor Summary
public  MergeIterator(OgnlValueStack stack)
    

Method Summary
public  voidaddParameter(Object value)
    
public  booleanend(Writer writer, String body)
    
public  voidsetId(String id)
    
public  booleanstart(Writer writer)
    


Constructor Detail
MergeIterator
public MergeIterator(OgnlValueStack stack)(Code)




Method Detail
addParameter
public void addParameter(Object value)(Code)



end
public boolean end(Writer writer, String body)(Code)



setId
public void setId(String id)(Code)
the id where the resultant merged iterator will be stored in the stack's context



start
public boolean start(Writer writer)(Code)



Fields inherited from com.opensymphony.webwork.components.Component
final public static String COMPONENT_STACK(Code)(Java Doc)
protected String id(Code)(Java Doc)
protected Map parameters(Code)(Java Doc)
protected OgnlValueStack stack(Code)(Java Doc)

Methods inherited from com.opensymphony.webwork.components.Component
public void addAllParameters(Map params)(Code)(Java Doc)
public void addParameter(String key, Object value)(Code)(Java Doc)
public boolean altSyntax()(Code)(Java Doc)
public void copyParams(Map params)(Code)(Java Doc)
protected String determineActionURL(String action, String namespace, String method, HttpServletRequest req, HttpServletResponse res, Map parameters, String scheme, boolean includeContext, boolean encodeResult, boolean escapeXml)(Code)(Java Doc)
protected String determineNamespace(String namespace, OgnlValueStack stack, HttpServletRequest req)(Code)(Java Doc)
public boolean end(Writer writer, String body)(Code)(Java Doc)
protected boolean end(Writer writer, String body, boolean popComponentStack)(Code)(Java Doc)
protected WebWorkException fieldError(String field, String errorMsg, Exception e)(Code)(Java Doc)
protected Component findAncestor(Class clazz)(Code)(Java Doc)
protected String findString(String expr)(Code)(Java Doc)
protected String findString(String expr, String field, String errorMsg)(Code)(Java Doc)
protected Object findValue(String expr)(Code)(Java Doc)
protected Object findValue(String expr, String field, String errorMsg)(Code)(Java Doc)
protected Object findValue(String expr, Class toType)(Code)(Java Doc)
public Stack getComponentStack()(Code)(Java Doc)
public String getId()(Code)(Java Doc)
public Map getParameters()(Code)(Java Doc)
public OgnlValueStack getStack()(Code)(Java Doc)
protected void popComponentStack()(Code)(Java Doc)
public void setId(String id)(Code)(Java Doc)
public boolean start(Writer writer)(Code)(Java Doc)
protected String toString(Throwable t)(Code)(Java Doc)
public boolean usesBody()(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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