ex7_47.txt

j2ee core design patterns

Example 7.47 ValueListIterator implementation: ProjectsListIterator

package com.corej2eepatterns.vlh;

// imports

// typically, this is implemented as an inner class of the
// custom Value List you implement. In this example,
// ProjectListIterator can be implemented as an inner class of
// ProjectsList. Shown here as a separate class for example
// purposes.

public class ProjectsListIterator implements ValueListIterator
{
    private List projectsList;
    private int currentIndex = -1;
    private int size = 0;

    public ProjectsListIterator(List projectsList) {
        this.projectsList = projectsList;
        size = projectsList.size();
        currentIndex=0;
    }

    // implement other methods
    public boolean hasNext() { ... }
    public Object next() { ... }
    public boolean hasPrevious() { ... }
    public Object previous() { ... }
    public int nextIndex() { ... }
    public int previousIndex() { ... }
    public void remove() { ... }
    public void set(Object o) {...}
    public void add(Object o) { ... }
}