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eXist-db NoSQL Database n-gram Index

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/*
 * eXist-db Open Source Native XML Database
 * Copyright (C) 2001 The eXist-db Authors
 *
 * [email protected]
 * http://www.exist-db.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.exist.indexing.ngram;

import org.exist.dom.QName;
import org.exist.util.DatabaseConfigurationException;
import org.exist.storage.ElementValue;

import java.util.Map;

/**
 */
public class NGramIndexConfig {

    private QName qname;

    public NGramIndexConfig(Map namespaces, String name) throws DatabaseConfigurationException {
        boolean isAttribute = false;
        if (name.startsWith("@")) {
            isAttribute = true;
            name = name.substring(1);
        }
        try {
            String prefix = QName.extractPrefix(name);
            String localName = QName.extractLocalName(name);
            String namespaceURI = "";
            if (prefix != null) {
                namespaceURI = namespaces.get(prefix);
                if(namespaceURI == null) {
                    throw new DatabaseConfigurationException("NGram index conifg: no namespace defined for prefix: " + prefix +
                        " in index definition");
                }
            }

            if (isAttribute) {
                qname = new QName(localName, namespaceURI, prefix, ElementValue.ATTRIBUTE);
            } else {
                qname = new QName(localName, namespaceURI, prefix);
            }
        } catch (QName.IllegalQNameException e) {
            throw new DatabaseConfigurationException("NGram index configuration: " + e.getMessage(), e);
        }
    }

    public QName getQName() {
        return qname;
    }
}