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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.jackrabbit.vault.util;

import java.util.Comparator;

import javax.jcr.RepositoryException;
import javax.xml.namespace.QName;

import org.apache.jackrabbit.spi.Name;
import org.apache.jackrabbit.spi.commons.namespace.NamespaceResolver;

/** 
 * Similar to {@link QNameComparator} but acting on {@link DocViewProperty2} leveraging its name and a given namespace resolver
 */
public final class DocViewProperty2Comparator implements Comparator {

    private final NamespaceResolver nsResolver;

    public DocViewProperty2Comparator(NamespaceResolver nsResolver) {
        this.nsResolver = nsResolver;
    }

    private QName getQName(Name name) throws RepositoryException {
        return new QName(name.getNamespaceURI(), name.getLocalName(), nsResolver.getPrefix(name.getNamespaceURI()));
    }

    @Override
    public int compare(DocViewProperty2 o1, DocViewProperty2 o2) {
        try {
            return QNameComparator.INSTANCE.compare(getQName(o1.getName()), getQName(o2.getName()));
        } catch (RepositoryException e) {
            throw new IllegalStateException(e);
        }
    }

}