/*
 * 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.openjpa.persistence.query;

/**
 * Denotes root domain instance representing a persistent type.
 *
 * @author Pinaki Poddar
 *
 */
public class RootPath extends AbstractDomainObject implements DomainObject {

	
    private static final long serialVersionUID = 1L;

    public RootPath(QueryDefinitionImpl owner, Class cls) {
		super(owner, null, PathOperator.ROOT, cls);
	}

	@Override
	public Class getLastSegment() {
		return (Class)super.getLastSegment();
	}

	@Override
	public String getAliasHint(AliasContext ctx) {
		return ctx.getEntityName(getLastSegment());
	}

	@Override
	public String asExpression(AliasContext ctx) {
		return ctx.getAlias(this);
	}

	@Override
	public String asJoinable(AliasContext ctx) {
        return ctx.getEntityName(getLastSegment()) + " " + ctx.getAlias(this);
	}

	@Override
	public String asProjection(AliasContext ctx) {
		return ctx.getAlias(this);
	}

	@Override
    public String toString() {
		return getLastSegment().getSimpleName();
	}
}
