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    • com.tailf.jnc.ElementLeafListValueIterator Maven / Gradle / Ivy

    The newest version!
    package com.tailf.jnc;

import java.util.Iterator;

/**
 * This is an iterator class that is used for iterating over all leaf-list
 * children with a specified name in a NodeSet. An object of this iterator
 * class is obtained from the {@link Element#iterator} method.
 * 
    
 * Example usage:
 * 
 * 
     * ElementLeafListValueIterator domainIter = config.iterator("domain");
 * while (domainIter.hasNext()) {
 *     String domain = (String) domainIter.next();
 *     System.out.println("Domain: " + host);
 * }
 * 
    
 * 
 */
public class ElementLeafListValueIterator implements Iterator {
    private Iterator childrenIterator;
    private Element nextChild;
    private boolean hasNextChild = false;
    private final String name;

    /**
     * Constructor to create a new children iterator for leaf-list children of
     * a specific name.
     */
    public ElementLeafListValueIterator(NodeSet children, String name) {
        childrenIterator = (children == null) ? null : children.iterator();
        this.name = name;
    }

    /**
     * @return true if there are more children;
     *         false otherwise.
     */
    @Override
    public boolean hasNext() {
        if (hasNextChild) {
            return true;
        }
        if (childrenIterator == null) {
            return false;
        }
        while (childrenIterator.hasNext()) {
            if (name == null) {
                return true;
            }
            final Element child = childrenIterator.next();
            if (child.name.equals(name)) {
                hasNextChild = true;
                nextChild = child;
                return true;
            }
        }
        return hasNextChild = false;
    }

    /**
     * @return next child or null.
     */
    public Object nextElement() {
        if (hasNextChild) {
            hasNextChild = false;
            return nextChild.value;
        }
        hasNextChild = false;
        while (childrenIterator.hasNext()) {
            final Element child = childrenIterator.next();
            if (name == null) {
                return child.value;
            } else if (child.name.equals(name)) {
                return child.value;
            }
        }
        return null;
    }

    /**
     * @return next child or null.
     */
    @Override
    public Object next() {
        return nextElement();
    }

    /**
     * Remove is not supported.
     */
    @Override
    public void remove() {
    }
}
    
    
    
    

    




    
    
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