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• Bindings.java

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org.eclipse.webdav.dom.Bindings Maven / Gradle / Ivy

package org.eclipse.webdav.dom;

import java.util.Enumeration;
import java.util.NoSuchElementException;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * An element editor for the WebDAV bindings element. See INTERNET DRAFT
 * draft-ietf-webdav-binding-protocol-02 section 13.1 for the element's
 * definition.
 * 

 * Note: This class/interface is part of an interim API that is still under 
 * development and expected to change significantly before reaching stability. 
 * It is being made available at this early stage to solicit feedback from pioneering 
 * adopters on the understanding that any code that uses this API will almost 
 * certainly be broken (repeatedly) as the API evolves.
 * 
 */
public class Bindings extends Property {
    /**
     * An ordered collection of the element names of the bindings
     * element's children.
     */
    protected static final String[] childNames = new String[] {"href", "segment"}; //$NON-NLS-1$ //$NON-NLS-2$

    /**
     * This class represent a single binding.
     *
     * @see Bindings#getBindings()
     */
    public class Binding {
        private String fHref = null;
        private String fSegment = null;

        /**
         * Construct a new binding with the given href and segment.  The
         * href and segment must not be null.
         *
         * @param href    the binding's href
         * @param segment the binding's segment
         */
        public Binding(String href, String segment) {
            Assert.isNotNull(href);
            Assert.isNotNull(segment);
            fHref = href;
            fSegment = segment;
        }

        /**
         * Return this binding's href.
         */
        public String getHref() {
            return fHref;
        }

        /**
         * Return this binding's segment.
         */
        public String getSegment() {
            return fSegment;
        }
    }

    /**
     * Creates a new editor on the given WebDAV bindings element. The
     * element is assumed to be well formed.
     *
     * @param root bindings element
     * @throws      MalformedElementException if there is reason to
     *              believe that the element is not well formed
     */
    public Bindings(Element root) throws MalformedElementException {
        super(root, "bindings"); //$NON-NLS-1$
    }

    /**
     * Adds the specified binding to this editor's bindings element. The
     * given href and segment must not be null.
     *
     * @param href the href part of the binding to add
     * @param segment the segment part of the binding to add
     */
    public void addBinding(String href, String segment) {
        Assert.isNotNull(href);
        Assert.isNotNull(segment);
        appendChild(root, "href", encodeHref(href)); //$NON-NLS-1$
        appendChild(root, "segment", segment); //$NON-NLS-1$
    }

    /**
     * Returns an Enumeration over this bindings
     * Bindings.
     *
     * @return an Enumeration of Bindings.Bindings
     * @throws MalformedElementException if there is reason to believe that
     *         this editor's underlying element is not well formed
     */
    public Enumeration getBindings() throws MalformedElementException {

        final Node firstHref = getFirstChild(root, "href"); //$NON-NLS-1$
        Node segment = null;
        if (firstHref != null)
            segment = getNextSibling((Element) firstHref, "segment"); //$NON-NLS-1$

        final Node firstSegment = segment;

        Enumeration e = new Enumeration() {
            Node fCurrentHref = firstHref;
            Node fCurrentSegment = firstSegment;

            public boolean hasMoreElements() {

                return fCurrentHref != null && fCurrentSegment != null;
            }

            public Object nextElement() {

                if (!hasMoreElements())
                    throw new NoSuchElementException();

                String nextHref = getFirstText((Element) fCurrentHref);
                String nextSegment = getFirstText((Element) fCurrentSegment);
                Binding nextBinding = new Binding(decodeHref(nextHref), nextSegment);

                fCurrentHref = getNextSibling((Element) fCurrentSegment, "href"); //$NON-NLS-1$
                fCurrentSegment = null;
                if (fCurrentHref != null)
                    fCurrentSegment = getNextSibling((Element) fCurrentHref, "segment"); //$NON-NLS-1$

                return nextBinding;
            }
        };

        return e;
    }
}