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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.util;

import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import java.util.TreeSet;
import java.util.Vector;

import javax.xml.XMLConstants;

import org.apache.xerces.xni.NamespaceContext;

/**
 * A read-only XNI wrapper around a JAXP NamespaceContext.
 * 
 * @author Michael Glavassevich, IBM
 * 
 * @version $Id: JAXPNamespaceContextWrapper.java 694381 2008-09-11 17:43:36Z mrglavas $
 */
public final class JAXPNamespaceContextWrapper implements NamespaceContext {
    
    private javax.xml.namespace.NamespaceContext fNamespaceContext;
    private SymbolTable fSymbolTable;
    private List fPrefixes;
    private final Vector fAllPrefixes = new Vector();
    
    private int[] fContext = new int[8];
    private int fCurrentContext;
    
    public JAXPNamespaceContextWrapper(SymbolTable symbolTable) {
        setSymbolTable(symbolTable);
    }
    
    public void setNamespaceContext(javax.xml.namespace.NamespaceContext context) {
        fNamespaceContext = context;
    }
    
    public javax.xml.namespace.NamespaceContext getNamespaceContext() {
        return fNamespaceContext;
    }
    
    public void setSymbolTable(SymbolTable symbolTable) {
        fSymbolTable = symbolTable;
    }
    
    public SymbolTable getSymbolTable() {
        return fSymbolTable;
    }
    
    public void setDeclaredPrefixes(List prefixes) {
        fPrefixes = prefixes;
    }
    
    public List getDeclaredPrefixes() {
        return fPrefixes;
    }
    
    /*
     * NamespaceContext methods
     */
    
    public String getURI(String prefix) {
        if (fNamespaceContext != null) {
            String uri = fNamespaceContext.getNamespaceURI(prefix);
            if (uri != null && !XMLConstants.NULL_NS_URI.equals(uri)) {
                return (fSymbolTable != null) ? fSymbolTable.addSymbol(uri) : uri.intern();
            }
        }
        return null;
    }

    public String getPrefix(String uri) {
        if (fNamespaceContext != null) {
            if (uri == null) {
                uri = XMLConstants.NULL_NS_URI;
            }
            String prefix = fNamespaceContext.getPrefix(uri);
            if (prefix == null) {
                prefix = XMLConstants.DEFAULT_NS_PREFIX;
            }
            return (fSymbolTable != null) ? fSymbolTable.addSymbol(prefix) : prefix.intern();
        }
        return null;
    }
    
    public Enumeration getAllPrefixes() {
        // There may be duplicate prefixes in the list so we 
        // first transfer them to a set to ensure uniqueness.
        return Collections.enumeration(new TreeSet(fAllPrefixes));
    }

    public void pushContext() {
        // extend the array, if necessary
        if (fCurrentContext + 1 == fContext.length) {
            int[] contextarray = new int[fContext.length * 2];
            System.arraycopy(fContext, 0, contextarray, 0, fContext.length);
            fContext = contextarray;
        }
        // push context
        fContext[++fCurrentContext] = fAllPrefixes.size();
        if (fPrefixes != null) {
            fAllPrefixes.addAll(fPrefixes);
        }
    }

    public void popContext() {
        fAllPrefixes.setSize(fContext[fCurrentContext--]);
    }

    public boolean declarePrefix(String prefix, String uri) {
        return true;
    }

    public int getDeclaredPrefixCount() {
        return (fPrefixes != null) ? fPrefixes.size() : 0;
    }

    public String getDeclaredPrefixAt(int index) {
        return (String) fPrefixes.get(index);
    }

    public void reset() {
        fCurrentContext = 0;
        fContext[fCurrentContext] = 0;
        fAllPrefixes.clear();
    }

} // JAXPNamespaceContextWrapper