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 *  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
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 *    https://www.apache.org/licenses/LICENSE-2.0
 *
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 *  software distributed under the License is distributed on an
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package org.apache.cayenne.access.sqlbuilder;

import java.util.Objects;

import org.apache.cayenne.access.sqlbuilder.sqltree.Node;
import org.apache.cayenne.access.sqlbuilder.sqltree.TableNode;
import org.apache.cayenne.map.DbAttribute;
import org.apache.cayenne.map.DbEntity;

/**
 * @since 4.2
 */
public class TableNodeBuilder implements NodeBuilder {

    private final String tableName;
    private final DbEntity dbEntity;

    private String alias;

    TableNodeBuilder(String tableName) {
        this.tableName = Objects.requireNonNull(tableName);
        this.dbEntity = null;
    }

    TableNodeBuilder(DbEntity dbEntity) {
        this.dbEntity = Objects.requireNonNull(dbEntity);
        this.tableName = dbEntity.getName();
    }

    public TableNodeBuilder as(String alias) {
        this.alias = alias;
        return this;
    }

    public ColumnNodeBuilder column(String column) {
        return new ColumnNodeBuilder(tableName, column);
    }

    public ColumnNodeBuilder column(DbAttribute attribute) {
        return new ColumnNodeBuilder(tableName, attribute);
    }

    public String getAlias() {
        return alias;
    }

    public String getTableName() {
        return tableName;
    }

    @Override
    public Node build() {
        if(dbEntity != null) {
            return new TableNode(dbEntity, alias);
        }
        return new TableNode(tableName, alias);
    }

}