cvs commit: jakarta-slide/src/share/org/apache/slide/structure StructureIterator.java

[lu...@apache.org]

luetzkendorf    2005/03/30 00:02:44

  Added:       src/share/org/apache/slide/structure StructureIterator.java
  Log:
  added
  
  Revision  Changes    Path
  1.1                  jakarta-slide/src/share/org/apache/slide/structure/StructureIterator.java
  
  Index: StructureIterator.java
  ===================================================================
  // vi: set ts=3 sw=3:
  package org.apache.slide.structure;
  
  import java.util.Enumeration;
  import java.util.NoSuchElementException;
  import java.util.Stack;
  
  import org.apache.slide.common.ServiceAccessException;
  import org.apache.slide.common.SlideToken;
  import org.apache.slide.event.VetoException;
  import org.apache.slide.security.AccessDeniedException;
  
  
  /**
   * @author Stefan L�tzkendorf
   */
  public class StructureIterator 
  {
      private Structure structure;
      private SlideToken token;
      private ObjectNode next = null;
      private Stack stack = new Stack();
      
      public StructureIterator(Structure structure, SlideToken token, String uri)
          throws ServiceAccessException, ObjectNotFoundException, VetoException,
          LinkedObjectNotFoundException, AccessDeniedException
      {
          this(structure, token, structure.retrieve(token, uri));
      }
      
      public StructureIterator(Structure structure, SlideToken token, ObjectNode root) 
          throws ServiceAccessException, ObjectNotFoundException, VetoException
      {
          this.structure = structure;
          this.token = token;
          this.next = root;
          
          try {
              stack.push(structure.getChildren(token, root));
          } catch (LinkedObjectNotFoundException e) {
              // can not happen
              e.printStackTrace();
          } 
      }
  
      public boolean hasNext() 
          throws ServiceAccessException, ObjectNotFoundException, VetoException
      {
          if (this.next != null) {
              return true;
          }
          
          if (this.stack.empty()) {
              return false;
          }
          
          Enumeration e = (Enumeration)this.stack.peek();
          while (e != null && !e.hasMoreElements()) {
              this.stack.pop();
              if (this.stack.empty()) {
                  return false;
              }
              e = (Enumeration)this.stack.peek();
          }
          
          try {
              if (e != null) {
                  this.next = (ObjectNode)e.nextElement();
                  this.stack.push(this.structure.getChildren(this.token, this.next));
                  return true;
              }
          } catch (LinkedObjectNotFoundException ex) {
              // can't happen
          }
          
          return false;
      }
  
      public ObjectNode nextNode()
          throws ServiceAccessException, ObjectNotFoundException, VetoException
      {
          if (hasNext()) {
              ObjectNode node = (ObjectNode)this.next;
              this.next = null;
              return node;
          } else {
              throw new NoSuchElementException();
          }
      }
  }
  
  
  

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