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The Apache Commons Digester package lets you configure an XML to Java object mapping module which triggers certain actions called rules whenever a particular pattern of nested XML elements is recognized.

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package org.apache.commons.digester3.xmlrules;

/*
 * 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.
 */

import java.util.StringTokenizer;

import org.apache.commons.digester3.binder.CallMethodBuilder;
import org.apache.commons.digester3.binder.LinkedRuleBuilder;
import org.apache.commons.digester3.binder.RulesBinder;
import org.xml.sax.Attributes;

/**
 * 
 */
final class CallMethodRule
    extends AbstractXmlRule
{

    public CallMethodRule( RulesBinder targetRulesBinder, PatternStack patternStack )
    {
        super( targetRulesBinder, patternStack );
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void bindRule( LinkedRuleBuilder linkedRuleBuilder, Attributes attributes )
        throws Exception
    {
        CallMethodBuilder builder = linkedRuleBuilder.callMethod( attributes.getValue( "methodname" ) );

        // Select which element is to be the target. Default to zero,
        // ie the top object on the stack.
        int targetOffset = 0;
        String targetOffsetStr = attributes.getValue( "targetoffset" );
        if ( targetOffsetStr != null )
        {
            targetOffset = Integer.parseInt( targetOffsetStr );
            builder.withTargetOffset( targetOffset );
        }

        builder.useExactMatch( "true".equalsIgnoreCase( attributes.getValue( "useExactMatch" ) ) );

        String paramCountStr = attributes.getValue( "paramcount" );
        if ( paramCountStr != null )
        {
            int paramCount = Integer.parseInt( attributes.getValue( "paramcount" ) );

            builder.withParamCount( paramCount );
        }

        String paramTypesStr = attributes.getValue( "paramtypes" );
        if ( paramTypesStr != null && paramTypesStr.length() > 0 )
        {
            StringTokenizer tokens = new StringTokenizer( paramTypesStr, " \t\n\r," );
            String[] paramTypeNames = new String[tokens.countTokens()];
            int counter = 0;
            while ( tokens.hasMoreTokens() )
            {
                paramTypeNames[counter++] = tokens.nextToken();
            }
            builder.withParamTypes( paramTypeNames );
        }

        if ( "true".equalsIgnoreCase( attributes.getValue( "usingElementBodyAsArgument" ) ) )
        {
            builder.usingElementBodyAsArgument();
        }
    }

}