| /* |
| * 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.cassandra.spark.utils; |
| |
| import java.util.Locale; |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.function.Supplier; |
| |
| /** |
| * Utility methods for {@link Map} |
| */ |
| public final class MapUtils |
| { |
| private MapUtils() |
| { |
| throw new IllegalStateException(getClass() + " is static utility class and shall not be instantiated"); |
| } |
| |
| /** |
| * Returns the lower-cased key using {@link Locale#ROOT} |
| * |
| * @param key the key |
| * @return the lower-cased key using {@link Locale#ROOT} |
| */ |
| public static String lowerCaseKey(String key) |
| { |
| return key != null ? key.toLowerCase(Locale.ROOT) : null; |
| } |
| |
| public static String getOrThrow(Map<String, String> options, String key) |
| { |
| return getOrThrow(options, key, key); |
| } |
| |
| public static String getOrThrow(Map<String, String> options, String key, String name) |
| { |
| return getOrThrow(options, key, throwable(name)); |
| } |
| |
| public static Supplier<RuntimeException> throwable(String name) |
| { |
| return () -> new RuntimeException(String.format("No %s specified", name)); |
| } |
| |
| public static String getOrThrow(Map<String, String> options, String key, Supplier<RuntimeException> throwable) |
| { |
| return getOrHandle(options, key, () -> { |
| throw throwable.get(); |
| }); |
| } |
| |
| public static String getOrHandle(Map<String, String> options, String key, Supplier<String> handler) |
| { |
| String value = options.get(lowerCaseKey(key)); |
| if (value == null) |
| { |
| return handler.get(); |
| } |
| return value; |
| } |
| |
| /** |
| * Returns the boolean value for the given {@code key} in the {@code options} map. The key is lower-cased before |
| * accessing the map. The {@code defaultValue} is returned when the key doesn't match any element from the map. |
| * |
| * @param options the map |
| * @param key the key to the map |
| * @param defaultValue the default value |
| * @return the boolean value |
| */ |
| public static boolean getBoolean(Map<String, String> options, String key, boolean defaultValue) |
| { |
| return getBoolean(options, key, defaultValue, null); |
| } |
| |
| /** |
| * Returns the boolean value for the given {@code key} in the {@code options} map. The key is lower-cased before |
| * accessing the map. The {@code defaultValue} is returned when the key doesn't match any element from the map. |
| * |
| * @param options the map |
| * @param key the key to the map |
| * @param defaultValue the default value |
| * @param displayName an optional name to display in the error message |
| * @return the boolean value |
| */ |
| public static boolean getBoolean(Map<String, String> options, String key, boolean defaultValue, String displayName) |
| { |
| String value = options.get(lowerCaseKey(key)); |
| // We can't use `Boolean.parseBoolean` here, as it returns false for invalid strings |
| if (value == null) |
| { |
| return defaultValue; |
| } |
| else if (value.equalsIgnoreCase("true")) |
| { |
| return true; |
| } |
| else if (value.equalsIgnoreCase("false")) |
| { |
| return false; |
| } |
| displayName = displayName != null ? displayName : key; |
| throw new IllegalArgumentException("Key " + displayName + " with value " + value + " is not a valid boolean string"); |
| } |
| |
| /** |
| * Returns the int value for the given {@code key} in the {@code options} map. The key is lower-cased before |
| * accessing the map. The {@code defaultValue} is returned when the key doesn't match any element from the map. |
| * |
| * @param options the map |
| * @param key the key to the map |
| * @param defaultValue the default value |
| * @return the int value |
| */ |
| public static int getInt(Map<String, String> options, String key, int defaultValue) |
| { |
| return getInt(options, key, defaultValue, null); |
| } |
| |
| /** |
| * Returns the int value for the given {@code key} in the {@code options} map. The key is lower-cased before |
| * accessing the map. The {@code defaultValue} is returned when the key doesn't match any element from the map. |
| * |
| * @param options the map |
| * @param key the key to the map |
| * @param defaultValue the default value |
| * @param displayName an optional name to display in the error message |
| * @return the int value |
| */ |
| public static int getInt(Map<String, String> options, String key, int defaultValue, String displayName) |
| { |
| return getOptionalInt(options, key, displayName).orElse(defaultValue); |
| } |
| |
| /** |
| * Returns an {@link Optional} of int value for the given {@code key} in the {@code options} map. The key is lower-cased before |
| * accessing the map. An empty {@link Optional} is returned when the key doesn't match any element from the map. |
| * |
| * @param options the map |
| * @param key the key to the map |
| * @param displayName an optional name to display in the error message |
| * @return {@link Optional} of {@link Integer} |
| */ |
| public static Optional<Integer> getOptionalInt(Map<String, String> options, String key, String displayName) |
| { |
| String value = options.get(lowerCaseKey(key)); |
| try |
| { |
| return value != null ? Optional.of(Integer.parseInt(value)) : Optional.empty(); |
| } |
| catch (NumberFormatException exception) |
| { |
| displayName = displayName != null ? displayName : key; |
| throw new IllegalArgumentException("Key " + displayName + " with value " + value + " is not a valid integer string.", |
| exception); |
| } |
| } |
| |
| /** |
| * Returns the long value for the given {@code key} in the {@code options} map. The key is lower-cased before |
| * accessing the map. The {@code defaultValue} is returned when the key doesn't match any element from the map. |
| * |
| * @param options the map |
| * @param key the key to the map |
| * @param defaultValue the default value |
| * @return the long value |
| */ |
| public static long getLong(Map<String, String> options, String key, long defaultValue) |
| { |
| String value = options.get(lowerCaseKey(key)); |
| return value != null ? Long.parseLong(value) : defaultValue; |
| } |
| |
| public static <T extends Enum<T>> T getEnumOption(Map<String, String> options, String key, T defaultValue) |
| { |
| return getEnumOption(options, key, defaultValue, null); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public static <T extends Enum<T>> T getEnumOption(Map<String, String> options, |
| String key, T defaultValue, |
| String displayName) |
| { |
| String value = options.get(lowerCaseKey(key)); |
| try |
| { |
| return value != null ? (T) Enum.valueOf(defaultValue.getClass(), value) : defaultValue; |
| } |
| catch (IllegalArgumentException exception) |
| { |
| displayName = displayName != null ? displayName : key; |
| throw new IllegalArgumentException("Key " + displayName + " with value " + value + " is not a valid Enum of type " + defaultValue.getClass() + ".", |
| exception); |
| } |
| } |
| |
| /** |
| * Returns the String value for the given {@code key} in the {@code options} map. The key is lower-cased before |
| * accessing the map. The {@code defaultValue} is returned when the key doesn't match any element from the map. |
| * |
| * @param options the map |
| * @param key the key to the map |
| * @param defaultValue the default value |
| * @return the long value |
| */ |
| public static String getOrDefault(Map<String, String> options, String key, String defaultValue) |
| { |
| return options.getOrDefault(lowerCaseKey(key), defaultValue); |
| } |
| } |