001// *************************************************************************************************************************** 002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * 003// * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * 004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * 005// * with the License. You may obtain a copy of the License at * 006// * * 007// * http://www.apache.org/licenses/LICENSE-2.0 * 008// * * 009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an * 010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * 011// * specific language governing permissions and limitations under the License. * 012// *************************************************************************************************************************** 013package org.apache.juneau; 014 015import org.apache.juneau.internal.*; 016 017/** 018 * Used to convert property values to standardized Boolean/Integer/Class/Object values in property store builders. 019 * 020 * @param <T> The normalized form. 021 */ 022public interface PropertyConverter<T> { 023 024 /** 025 * Convert the value to normalized form. 026 * 027 * @param o The raw value. 028 * @return The converted value. 029 */ 030 T convert(Object o); 031 032 /** 033 * Converts objects to strings. 034 */ 035 static final PropertyConverter<String> STRING_CONVERTER = new PropertyConverter<String>() { 036 @Override 037 public String convert(Object o) { 038 return ClassUtils.toString(o); 039 } 040 }; 041 042 /** 043 * Converts objects to integers. 044 */ 045 static final PropertyConverter<Integer> INTEGER_CONVERTER = new PropertyConverter<Integer>() { 046 @Override 047 public Integer convert(Object o) { 048 try { 049 if (o instanceof Integer) 050 return (Integer)o; 051 return Integer.valueOf(o.toString()); 052 } catch (Exception e) { 053 throw new ConfigException("Value ''{0}'' ({1}) cannot be converted to an Integer.", o, o.getClass().getSimpleName()); 054 } 055 } 056 }; 057 058 /** 059 * Converts objects to booleans. 060 */ 061 static final PropertyConverter<Boolean> BOOLEAN_CONVERTER = new PropertyConverter<Boolean>() { 062 @Override 063 public Boolean convert(Object o) { 064 if (o instanceof Boolean) 065 return (Boolean)o; 066 return Boolean.parseBoolean(o.toString()); 067 } 068 }; 069 070 /** 071 * Converts objects to classes. 072 */ 073 static final PropertyConverter<Class<?>> CLASS_CONVERTER = new PropertyConverter<Class<?>>() { 074 @Override 075 public Class<?> convert(Object o) { 076 try { 077 if (o instanceof Class) 078 return (Class<?>)o; 079 throw new ConfigException("Value ''{0}'' ({1}) cannot be converted to a Class.", o, o.getClass().getSimpleName()); 080 } catch (Exception e) { 081 throw new ConfigException("Value ''{0}'' ({1}) cannot be converted to a Class.", o, o.getClass().getSimpleName()); 082 } 083 } 084 }; 085 086 /** 087 * Converts objects to objects. 088 */ 089 static final PropertyConverter<Object> OBJECT_CONVERTER = new PropertyConverter<Object>() { 090 @Override 091 public Object convert(Object o) { 092 return o; 093 } 094 }; 095}