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A slightly adapted version of Xerces 2.11.0 to allow the XMLStringBuffer responsible for XML attribute scanning to start larger and thus avoid extended appending times. The initial buffer size is controlled by settting the system property julielab.xerces.attributebuffersize (also available as constant XMLScanner#ATTRIBUTE_BUFFER_SIZE).

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.xerces.dom;


/**
 * Entity nodes hold the reference data for an XML Entity -- either
 * parsed or unparsed. The nodeName (inherited from Node) will contain
 * the name (if any) of the Entity. Its data will be contained in the
 * Entity's children, in exactly the structure which an
 * EntityReference to this name will present within the document's
 * body.
 * 
 * Note that this object models the actual entity, _not_ the entity
 * declaration or the entity reference.
 * 

 * An XML processor may choose to completely expand entities before
 * the structure model is passed to the DOM; in this case, there will
 * be no EntityReferences in the DOM tree.
 * 

 * Quoting the 10/01 DOM Proposal,
 * 

 * "The DOM Level 1 does not support editing Entity nodes; if a user
 * wants to make changes to the contents of an Entity, every related
 * EntityReference node has to be replaced in the structure model by
 * a clone of the Entity's contents, and then the desired changes
 * must be made to each of those clones instead. All the
 * descendants of an Entity node are readonly."
 * 
 * I'm interpreting this as: It is the parser's responsibilty to call
 * the non-DOM operation setReadOnly(true,true) after it constructs
 * the Entity. Since the DOM explicitly decided not to deal with this,
 * _any_ answer will involve a non-DOM operation, and this is the
 * simplest solution.
 *
 * @xerces.internal
 *
 * @version $Id: DeferredEntityImpl.java 447266 2006-09-18 05:57:49Z mrglavas $
 * @since  PR-DOM-Level-1-19980818.
 */
public class DeferredEntityImpl
    extends EntityImpl
    implements DeferredNode {

    //
    // Constants
    //

    /** Serialization version. */
    static final long serialVersionUID = 4760180431078941638L;

    //
    // Data
    //

    /** Node index. */
    protected transient int fNodeIndex;

    //
    // Constructors
    //

    /**
     * This is the deferred constructor. Only the fNodeIndex is given here.
     * All other data, can be requested from the ownerDocument via the index.
     */
    DeferredEntityImpl(DeferredDocumentImpl ownerDocument, int nodeIndex) {
        super(ownerDocument, null);

        fNodeIndex = nodeIndex;
        needsSyncData(true);
        needsSyncChildren(true);

    } // (DeferredDocumentImpl,int)

    //
    // DeferredNode methods
    //

    /** Returns the node index. */
    public int getNodeIndex() {
        return fNodeIndex;
    }

    //
    // Protected methods
    //

    /**
     * Synchronize the entity data. This is special because of the way
     * that the "fast" version stores the information.
     */
    protected void synchronizeData() {

        // no need to sychronize again
        needsSyncData(false);

        // get the node data
        DeferredDocumentImpl ownerDocument =
            (DeferredDocumentImpl)this.ownerDocument;
        name = ownerDocument.getNodeName(fNodeIndex);

        // get the entity data
        publicId    = ownerDocument.getNodeValue(fNodeIndex);
        systemId    = ownerDocument.getNodeURI(fNodeIndex);
        int extraDataIndex = ownerDocument.getNodeExtra(fNodeIndex);
        ownerDocument.getNodeType(extraDataIndex);

        notationName = ownerDocument.getNodeName(extraDataIndex);

        // encoding and version DOM L3
        version     = ownerDocument.getNodeValue(extraDataIndex);
        encoding    = ownerDocument.getNodeURI(extraDataIndex);

        // baseURI, actualEncoding DOM L3
        int extraIndex2 = ownerDocument.getNodeExtra(extraDataIndex);
        baseURI = ownerDocument.getNodeName(extraIndex2);
        inputEncoding = ownerDocument.getNodeValue(extraIndex2);

    } // synchronizeData()

    /** Synchronize the children. */
    protected void synchronizeChildren() {

        // no need to synchronize again
        needsSyncChildren(false);

        isReadOnly(false);
        DeferredDocumentImpl ownerDocument =
            (DeferredDocumentImpl) ownerDocument();
        ownerDocument.synchronizeChildren(this, fNodeIndex);
        setReadOnly(true, true);

    } // synchronizeChildren()

} // class DeferredEntityImpl