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The coolest XML library for Java around. Define typesafe views (projections) to xml. Use XPath to read and write XML. Bind XML to Java collections. Requires at least Java6, supports Java8 features and has no further runtime dependencies.
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/**
 *  Copyright 2014 Sven Ewald
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.xmlbeam;

import java.io.Serializable;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.xmlbeam.dom.DOMAccess;
import org.xmlbeam.util.intern.DOMHelper;

/**
 * 
 * @author sven
 *
 */
class DefaultDOMAccessInvoker implements DOMAccess, Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = -405766165734498635L;

    final static class DefaultObjectInvoker extends DefaultDOMAccessInvoker {
        private DefaultObjectInvoker(final Class projectionInterface, final Node documentOrElement, final XBProjector projector) {
            super(documentOrElement, projectionInterface, projector);
        }

        @Override
        public String toString() {
            final String typeDesc = getDOMNode().getNodeType() == Node.DOCUMENT_NODE ? "document '" + getDOMNode().getBaseURI() + "'" : "element " + "'" + getDOMNode().getNodeName() + "[" + Integer.toString(getDOMNode().hashCode(), 16) + "]'";
            return "Projection [" + getProjectionInterface().getName() + "]" + " to " + typeDesc;
        }
    }

    final static class XMLRenderingObjectInvoker extends DefaultDOMAccessInvoker {
        private XMLRenderingObjectInvoker(final Class projectionInterface, final Node documentOrElement, final XBProjector projector) {
            super(documentOrElement, projectionInterface, projector);
        }

        @Override
        public String toString() {
            return super.asString();
        }
    }

    private final Node documentOrElement;
    private final Class projectionInterface;
    private final XBProjector projector;

    /**
     * @param documentOrElement
     * @param projectionInterface
     */
    private DefaultDOMAccessInvoker(final Node documentOrElement, final Class projectionInterface, final XBProjector projector) {
        this.documentOrElement = documentOrElement;
        this.projectionInterface = projectionInterface;
        this.projector = projector;
    }

    @Override
    public Class getProjectionInterface() {
        return projectionInterface;
    }

    @Override
    public Node getDOMNode() {
        return documentOrElement;
    }

    @Override
    public Document getDOMOwnerDocument() {
        return DOMHelper.getOwnerDocumentFor(documentOrElement);
    }

    @Override
    public Element getDOMBaseElement() {
        if (Node.DOCUMENT_NODE == documentOrElement.getNodeType()) {
            return ((Document) documentOrElement).getDocumentElement();
        }
        assert Node.ELEMENT_NODE == documentOrElement.getNodeType();
        return (Element) documentOrElement;
    }

    @Override
    public boolean equals(final Object o) {
        if (!(o instanceof DOMAccess)) {
            return false;
        }
        DOMAccess op = (DOMAccess) o;
        if (!projectionInterface.equals(op.getProjectionInterface())) {
            return false;
        }
        // Unfortunately Node.isEqualNode() is implementation specific and does
        // not need to match our hashCode implementation.
        // So we define our own node equality.
        return DOMHelper.nodesAreEqual(documentOrElement, op.getDOMNode());
    }

    @Override
    public int hashCode() {
        return (31 * projectionInterface.hashCode()) + (27 * DOMHelper.nodeHashCode(documentOrElement));
    }

    @Override
    public String asString() {
        return DOMHelper.toXMLString(projector,getDOMNode());
    }

    /**
     * @param projectionInterface
     * @param node
     * @param projector
     * @param toStringRendersXML
     * @return a new instance
     */
    public static DefaultDOMAccessInvoker create(final Class projectionInterface, final Node node, final XBProjector projector, final boolean toStringRendersXML) {
        return toStringRendersXML ? new XMLRenderingObjectInvoker(projectionInterface, node, projector) : new DefaultObjectInvoker(projectionInterface, node, projector);
    }

    @Override
    public DOMAccess create(String path, Object value) {        
        throw new IllegalStateException("This method should not be called.");
    }
    
}