Java tutorial
/*------------------------------------------------------------------------------------------------- _______ __ _ _______ _______ ______ ______ |_____| | \ | | |______ | \ |_____] | | | \_| | ______| |_____/ |_____] Copyright (c) 2016, antsdb.com and/or its affiliates. All rights reserved. *-xguo0<@ This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License, version 3, as published by the Free Software Foundation. You should have received a copy of the GNU Affero General Public License along with this program. If not, see <https://www.gnu.org/licenses/agpl-3.0.txt> -------------------------------------------------------------------------------------------------*/ package com.antsdb.saltedfish.sql.vdm; import org.apache.commons.lang.StringUtils; import com.antsdb.saltedfish.cpp.FishObject; import com.antsdb.saltedfish.cpp.Heap; import com.antsdb.saltedfish.sql.DataType; /** * @see http://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_locate * @author *-xguo0<@ */ public class FuncLocate extends Function { @Override public long eval(VdmContext ctx, Heap heap, Parameters params, long pRecord) { long pString = this.parameters.get(1).eval(ctx, heap, params, pRecord); if (pString == 0) { return 0; } long pSubstr = this.parameters.get(0).eval(ctx, heap, params, pRecord); if (pSubstr == 0) { return 0; } String str = (String) FishObject.get(heap, AutoCaster.toString(heap, pString)); String substr = (String) FishObject.get(heap, AutoCaster.toString(heap, pSubstr)); int pos = StringUtils.indexOf(str, substr) + 1; return FishObject.allocSet(heap, pos); } @Override public DataType getReturnType() { return DataType.integer(); } @Override public int getMinParameters() { return 2; } }