| /* |
| * 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.common.config.NullHandling; |
| import org.apache.druid.java.util.common.IAE; |
| import org.apache.druid.java.util.common.StringUtils; |
| import org.apache.druid.math.expr.Expr; |
| import org.apache.druid.math.expr.ExprEval; |
| import org.apache.druid.math.expr.ExprMacroTable; |
| import org.apache.druid.math.expr.ExprType; |
| |
| import javax.annotation.Nonnull; |
| import java.util.function.Function; |
| |
| /** |
| * {@link Expr} class returned by {@link ContainsExprMacro} and {@link CaseInsensitiveContainsExprMacro} for |
| * evaluating the expression. |
| */ |
| class ContainsExpr extends ExprMacroTable.BaseScalarUnivariateMacroFunctionExpr |
| { |
| private final Function<String, Boolean> searchFunction; |
| private final Expr searchStrExpr; |
| |
| ContainsExpr(String functioName, Expr arg, Expr searchStrExpr, boolean caseSensitive) |
| { |
| super(functioName, arg); |
| this.searchStrExpr = validateSearchExpr(searchStrExpr, functioName); |
| // Creates the function eagerly to avoid branching in eval. |
| this.searchFunction = createFunction(searchStrExpr, caseSensitive); |
| } |
| |
| private ContainsExpr(String functioName, Expr arg, Expr searchStrExpr, Function<String, Boolean> searchFunction) |
| { |
| super(functioName, arg); |
| this.searchFunction = searchFunction; |
| this.searchStrExpr = validateSearchExpr(searchStrExpr, functioName); |
| } |
| |
| @Nonnull |
| @Override |
| public ExprEval eval(final Expr.ObjectBinding bindings) |
| { |
| final String s = NullHandling.nullToEmptyIfNeeded(arg.eval(bindings).asString()); |
| |
| if (s == null) { |
| // same behavior as regexp_like. |
| return ExprEval.of(false, ExprType.LONG); |
| } else { |
| final boolean doesContain = searchFunction.apply(s); |
| return ExprEval.of(doesContain, ExprType.LONG); |
| } |
| } |
| |
| @Override |
| public Expr visit(Expr.Shuttle shuttle) |
| { |
| Expr newArg = arg.visit(shuttle); |
| return shuttle.visit(new ContainsExpr(name, newArg, searchStrExpr, searchFunction)); |
| } |
| |
| @Override |
| public String stringify() |
| { |
| return StringUtils.format("%s(%s, %s)", name, arg.stringify(), searchStrExpr.stringify()); |
| } |
| |
| private Function<String, Boolean> createFunction(Expr searchStrExpr, boolean caseSensitive) |
| { |
| String searchStr = StringUtils.nullToEmptyNonDruidDataString((String) searchStrExpr.getLiteralValue()); |
| if (caseSensitive) { |
| return s -> s.contains(searchStr); |
| } |
| return s -> org.apache.commons.lang.StringUtils.containsIgnoreCase(s, searchStr); |
| } |
| |
| private Expr validateSearchExpr(Expr searchExpr, String functioName) |
| { |
| if (!ExprUtils.isStringLiteral(searchExpr)) { |
| throw new IAE("Function[%s] substring must be a string literal", functioName); |
| } |
| return searchExpr; |
| } |
| } |