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/*
 * 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 com.hazelcast.org.apache.calcite.util;

import java.io.StringWriter;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Contains methods that call JDK methods that the
 * forbidden
 * APIs checker does not approve of.
 *
 * 

This class is excluded from the check, so methods called via this class * will not fail the build. */ public class Unsafe { private Unsafe() {} /** Calls {@link System#exit}. */ public static void systemExit(int status) { System.exit(status); } /** Calls {@link Object#notifyAll()}. */ public static void notifyAll(Object o) { o.notifyAll(); } /** Calls {@link Object#wait()}. */ @SuppressWarnings("WaitNotInLoop") public static void wait(Object o) throws InterruptedException { o.wait(); } /** Clears the contents of a {@link StringWriter}. */ @SuppressWarnings("JdkObsolete") public static void clear(StringWriter sw) { // Included in this class because StringBuffer is banned. sw.getBuffer().setLength(0); } /** Helper for the SQL {@code REGEXP_REPLACE} function. * *

It is marked "unsafe" because it uses {@link StringBuffer}; * Versions of {@link Matcher#appendReplacement(StringBuffer, String)} * and {@link Matcher#appendTail(StringBuffer)} * that use {@link StringBuilder} are not available until JDK 9. */ @SuppressWarnings("JdkObsolete") public static String regexpReplace(String s, Pattern pattern, String replacement, int pos, int occurrence) { Bug.upgrade("when we drop JDK 8, replace StringBuffer with StringBuilder"); final StringBuffer sb = new StringBuffer(); final String input; if (pos != 1) { sb.append(s, 0, pos - 1); input = s.substring(pos - 1); } else { input = s; } int count = 0; Matcher matcher = pattern.matcher(input); while (matcher.find()) { if (occurrence == 0) { matcher.appendReplacement(sb, replacement); } else if (++count == occurrence) { matcher.appendReplacement(sb, replacement); break; } } matcher.appendTail(sb); return sb.toString(); } }





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