/*
 * Copyright 2004-2011 H2 Group.
 * Copyright 2011 James Moger.
 *
 * Licensed 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 com.iciql;

import com.iciql.TableDefinition.FieldDefinition;

/**
 * This class represents a column of a table in a query.
 * 
 * @param <T>
 *            the table data type
 */

class SelectColumn<T> {
	private SelectTable<T> selectTable;
	private FieldDefinition fieldDef;

	SelectColumn(SelectTable<T> table, FieldDefinition fieldDef) {
		this.selectTable = table;
		this.fieldDef = fieldDef;
	}

	void appendSQL(SQLStatement stat) {
		if (selectTable.getQuery().isJoin()) {
			stat.appendSQL(selectTable.getAs() + "." + fieldDef.columnName);
		} else {
			stat.appendColumn(fieldDef.columnName);
		}
	}

	FieldDefinition getFieldDefinition() {
		return fieldDef;
	}

	SelectTable<T> getSelectTable() {
		return selectTable;
	}

	Object getCurrentValue() {
		return fieldDef.getValue(selectTable.getCurrent());
	}
}