/*
 * Copyright 2016-2018 shardingsphere.io.
 * <p>
 * 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.
 * </p>
 */

package io.shardingsphere.core.parsing.parser.context.selectitem;

import com.google.common.base.Optional;

/**
 * Select item interface.
 *
 * @author zhangliang
 */
public interface SelectItem {
    
    /**
     * 获取表达式.
     * 
     * @return 表达式
     */
    String getExpression();
    
    /**
     * 获取别名.
     * 
     * @return 别名
     */
    Optional<String> getAlias();
}

/*
 * Copyright 2016-2018 shardingsphere.io.
 * <p>
 * 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.
 * </p>
 */

package io.shardingsphere.core.parsing.parser.context.selectitem;

import com.google.common.base.Optional;

/**
 * Select item interface.
 *
 * @author zhangliang
 */
public interface SelectItem {
    
    /**
     * Get expression.
     * 
     * @return expression
     */
    String getExpression();
    
    /**
     * Get alias.
     * 
     * @return alias
     */
    Optional<String> getAlias();
}

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