/**
 * 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.ws.commons.schema.utils;

import javax.xml.namespace.QName;

import org.apache.ws.commons.schema.XmlSchema;
import org.apache.ws.commons.schema.XmlSchemaException;

public abstract class XmlSchemaRefBase {

    protected XmlSchema parent;
    protected QName targetQName;
    private XmlSchemaNamed namedTwin;
    
    protected abstract void forgetTargetObject();
    
    public void setNamedObject(XmlSchemaNamed named) {
        namedTwin = named;
    }

    public QName getTargetQName() {
        return targetQName;
    }

    public void setTargetQName(QName targetQName) {
        if (targetQName != null && namedTwin != null
            && !namedTwin.isAnonymous()) {
            throw new XmlSchemaException("It is invalid to set the ref= name"
                                         + " for an item that has a name.");
        }
        /*
         * We could possibly complain about no ref and also no name.
         */
        this.targetQName = targetQName;
        forgetTargetObject();
    }

}
