GridSqlColumn.java

/*
 * 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.ignite.internal.processors.query.h2.sql;

import java.util.Collections;
import org.apache.ignite.internal.util.typedef.F;
import org.h2.command.Parser;
import org.h2.table.Column;

/**
 * Column.
 */
public class GridSqlColumn extends GridSqlElement {
    /** */
    private GridSqlAst from;

    /** */
    private String schema;

    /** */
    private String tblAlias;

    /** */
    private String colName;

    /** */
    private Column col;

    /**
     * @param col Column.
     * @param from From.
     * @param colName Column name.
     */
    public GridSqlColumn(Column col, GridSqlAst from, String colName) {
        this(col, from, null, null, colName);
    }

    /**
     * @param col Column.
     * @param from From.
     * @param schema Schema name.
     * @param tblAlias Table alias.
     * @param colName Column name.
     */
    public GridSqlColumn(Column col, GridSqlAst from, String schema, String tblAlias, String colName) {
        super(Collections.<GridSqlAst>emptyList());

        assert !F.isEmpty(colName): colName;

        this.col = col;
        this.from = from;

        this.colName = colName;
        this.schema = schema;
        this.tblAlias = tblAlias;
    }

    /**
     * @return Column name.
     */
    public String columnName() {
        return colName;
    }

    /**
     * @return Schema name.
     */
    public String schema() {
        return schema;
    }

    /**
     * @return Table alias.
     */
    public String tableAlias() {
        return tblAlias;
    }

    /**
     * @param tblAlias Table alias.
     */
    public void tableAlias(String tblAlias) {
        this.tblAlias = tblAlias;
    }

    /** {@inheritDoc} */
    @Override public String getSQL() {
        String sql = Parser.quoteIdentifier(colName);

        if (tblAlias != null)
            sql = Parser.quoteIdentifier(tblAlias) + "." + sql;

        if (schema != null)
            sql = Parser.quoteIdentifier(schema) + "." + sql;

        return sql;
    }

    /**
     * @return Expression in from.
     */
    public GridSqlAst expressionInFrom() {
        return from;
    }

    /**
     * @param from Expression in from.
     */
    public void expressionInFrom(GridSqlAlias from) {
        this.from = from;
    }

    /**
     * @return H2 Column.
     */
    public Column column() {
        return col;
    }
}