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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 org.apache.xerces.xni.XMLLocator;
import org.xml.sax.Locator;
import org.xml.sax.ext.Locator2;

/**
 * A light wrapper around a SAX locator. This is useful
 * when bridging between SAX and XNI components.
 * 
 * @author Michael Glavassevich, IBM
 * 
 * @version $Id: SAXLocatorWrapper.java 699892 2008-09-28 21:08:27Z mrglavas $
 */
public final class SAXLocatorWrapper implements XMLLocator {
    
    private Locator fLocator = null;
    private Locator2 fLocator2 = null;
    
    public SAXLocatorWrapper() {}
    
    public void setLocator(Locator locator) {
        fLocator = locator;
        if (locator instanceof Locator2 || locator == null) {
            fLocator2 = (Locator2) locator;
        }
    }
    
    public Locator getLocator() {
        return fLocator;
    }
    
    /*
     * XMLLocator methods
     */
    
    public String getPublicId() {
        if (fLocator != null) {
            return fLocator.getPublicId();
        }
        return null;
    }
    
    public String getLiteralSystemId() {
        if (fLocator != null) {
            return fLocator.getSystemId();
        }
        return null;
    }

    public String getBaseSystemId() {
        return null;
    }

    public String getExpandedSystemId() {
        return getLiteralSystemId();
    }

    public int getLineNumber() {
        if (fLocator != null) {
            return fLocator.getLineNumber();
        }
        return -1;
    }

    public int getColumnNumber() {
        if (fLocator != null) {
            return fLocator.getColumnNumber();
        }
        return -1;
    }

    public int getCharacterOffset() {
        return -1;
    }

    public String getEncoding() {
        if (fLocator2 != null) {
            return fLocator2.getEncoding();
        }
        return null;
    }

    public String getXMLVersion() {
        if (fLocator2 != null) {
            return fLocator2.getXMLVersion();
        }
        return null;
    }
    
} // SAXLocatorWrapper