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com.alipay.oceanbase.rpc.protocol.payload.impl.column.ObGeneratedColumnReferFunc Maven / Gradle / Ivy

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/*-
 * #%L
 * OBKV Table Client Framework
 * %%
 * Copyright (C) 2021 OceanBase
 * %%
 * OBKV Table Client Framework is licensed under Mulan PSL v2.
 * You can use this software according to the terms and conditions of the Mulan PSL v2.
 * You may obtain a copy of Mulan PSL v2 at:
 *          http://license.coscl.org.cn/MulanPSL2
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PSL v2 for more details.
 * #L%
 */

package com.alipay.oceanbase.rpc.protocol.payload.impl.column;

import com.alipay.oceanbase.rpc.protocol.payload.impl.ObCollationType;

import java.util.ArrayList;
import java.util.List;

public class ObGeneratedColumnReferFunc implements ObGeneratedColumnSimpleFunc {
    private final List refColumnNames;

    /*
     * Ob generated column refer func.
     */
    public ObGeneratedColumnReferFunc(String columnName) {
        List refColumnNameList = new ArrayList(1);
        refColumnNameList.add(columnName);
        this.refColumnNames = refColumnNameList;
    }

    /*
     * Set parameters.
     */
    @Override
    public void setParameters(List parameters) {
        //ignore
    }

    /*
     * Get min parameters.
     */
    @Override
    public int getMinParameters() {
        return 0;
    }

    /*
     * Get max parameters.
     */
    @Override
    public int getMaxParameters() {
        return 0;
    }

    /*
     * Get ref column names.
     */
    @Override
    public List getRefColumnNames() {
        return refColumnNames;
    }

    /*
     * Eval value.
     */
    @Override
    public Object evalValue(ObCollationType collationType, Object... refs)
                                                                          throws IllegalArgumentException {
        if (refs.length == 0 || refs.length > 1) {
            throw new IllegalArgumentException(
                "ObGeneratedColumnReferFunc is refer to itself so that the length of the refs must be 1. refs:"
                        + refs);
        }
        return refs[0];
    }
}