| /* |
| * 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.storm.utils; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| |
| public class ObjectReader { |
| |
| public static List<String> getStrings(final Object o) { |
| if (o == null) { |
| return new ArrayList<String>(); |
| } else if (o instanceof String) { |
| return new ArrayList<String>() { |
| { |
| add((String) o); |
| } |
| }; |
| } else if (o instanceof Collection) { |
| List<String> answer = new ArrayList<String>(); |
| for (Object v : (Collection) o) { |
| answer.add(v.toString()); |
| } |
| return answer; |
| } else { |
| throw new IllegalArgumentException("Don't know how to convert to string list"); |
| } |
| } |
| |
| public static String getString(Object o) { |
| if (null == o) { |
| throw new IllegalArgumentException("Don't know how to convert null to String"); |
| } |
| return o.toString(); |
| } |
| |
| public static String getString(Object o, String defaultValue) { |
| if (null == o) { |
| return defaultValue; |
| } |
| if (o instanceof String) { |
| return (String) o; |
| } else { |
| throw new IllegalArgumentException("Don't know how to convert " + o + " to String"); |
| } |
| } |
| |
| public static Integer getInt(Object o) { |
| Integer result = getInt(o, null); |
| if (null == result) { |
| throw new IllegalArgumentException("Don't know how to convert null to int"); |
| } |
| return result; |
| } |
| |
| public static Integer getInt(Object o, Integer defaultValue) { |
| if (null == o) { |
| return defaultValue; |
| } |
| |
| if (o instanceof Integer |
| || o instanceof Short |
| || o instanceof Byte) { |
| return ((Number) o).intValue(); |
| } else if (o instanceof Long) { |
| final long l = (Long) o; |
| if (l <= Integer.MAX_VALUE && l >= Integer.MIN_VALUE) { |
| return (int) l; |
| } |
| } else if (o instanceof String) { |
| return Integer.parseInt((String) o); |
| } |
| |
| throw new IllegalArgumentException("Don't know how to convert " + o + " to int"); |
| } |
| |
| public static Long getLong(Object o) { |
| return getLong(o, null); |
| } |
| |
| public static Long getLong(Object o, Long defaultValue) { |
| if (null == o) { |
| return defaultValue; |
| } |
| if (o instanceof Number) { |
| return ((Number) o).longValue(); |
| } else if (o instanceof String) { |
| return Long.valueOf((String) o); |
| } |
| throw new IllegalArgumentException("Don't know how to convert " + o + " to a long"); |
| } |
| |
| public static Double getDouble(Object o) { |
| Double result = getDouble(o, null); |
| if (null == result) { |
| throw new IllegalArgumentException("Don't know how to convert null to double"); |
| } |
| return result; |
| } |
| |
| public static Double getDouble(Object o, Double defaultValue) { |
| if (null == o) { |
| return defaultValue; |
| } |
| if (o instanceof Number) { |
| return ((Number) o).doubleValue(); |
| } else { |
| throw new IllegalArgumentException("Don't know how to convert (" + o + ") to double"); |
| } |
| } |
| |
| public static boolean getBoolean(Object o, boolean defaultValue) { |
| if (null == o) { |
| return defaultValue; |
| } |
| if (o instanceof Boolean) { |
| return (Boolean) o; |
| } else { |
| throw new IllegalArgumentException("Don't know how to convert " + o + " to boolean"); |
| } |
| } |
| } |