| /* |
| * 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.druid.query.expression; |
| |
| import org.apache.druid.java.util.common.IAE; |
| import org.apache.druid.math.expr.Expr; |
| import org.apache.druid.math.expr.ExprMacroTable; |
| |
| import java.util.List; |
| |
| /** |
| * This class implements a function that checks if one string contains another string. It is required that second |
| * string be a literal. This expression is case-sensitive. |
| * signature: |
| * long contains_string(string, string) |
| * <p> |
| * Examples: |
| * - {@code contains_string("foobar", "bar") - 1 } |
| * - {@code contains_string("foobar", "car") - 0 } |
| * - {@code contains_string("foobar", "Bar") - 0 } |
| * <p> |
| * See {@link CaseInsensitiveContainsExprMacro} for the case-insensitive version. |
| */ |
| public class ContainsExprMacro implements ExprMacroTable.ExprMacro |
| { |
| public static final String FN_NAME = "contains_string"; |
| |
| @Override |
| public String name() |
| { |
| return FN_NAME; |
| } |
| |
| @Override |
| public Expr apply(final List<Expr> args) |
| { |
| if (args.size() != 2) { |
| throw new IAE("Function[%s] must have 2 arguments", name()); |
| } |
| |
| final Expr arg = args.get(0); |
| final Expr searchStr = args.get(1); |
| return new ContainsExpr(FN_NAME, arg, searchStr, true); |
| } |
| } |