001/* 002 * Copyright 2002-2019 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.beans; 018 019import java.lang.reflect.Field; 020 021import org.springframework.core.MethodParameter; 022import org.springframework.core.convert.ConversionException; 023import org.springframework.core.convert.ConverterNotFoundException; 024import org.springframework.core.convert.TypeDescriptor; 025import org.springframework.lang.Nullable; 026import org.springframework.util.Assert; 027 028/** 029 * Base implementation of the {@link TypeConverter} interface, using a package-private delegate. 030 * Mainly serves as base class for {@link BeanWrapperImpl}. 031 * 032 * @author Juergen Hoeller 033 * @since 3.2 034 * @see SimpleTypeConverter 035 */ 036public abstract class TypeConverterSupport extends PropertyEditorRegistrySupport implements TypeConverter { 037 038 @Nullable 039 TypeConverterDelegate typeConverterDelegate; 040 041 042 @Override 043 @Nullable 044 public <T> T convertIfNecessary(@Nullable Object value, @Nullable Class<T> requiredType) throws TypeMismatchException { 045 return convertIfNecessary(value, requiredType, TypeDescriptor.valueOf(requiredType)); 046 } 047 048 @Override 049 @Nullable 050 public <T> T convertIfNecessary(@Nullable Object value, @Nullable Class<T> requiredType, 051 @Nullable MethodParameter methodParam) throws TypeMismatchException { 052 053 return convertIfNecessary(value, requiredType, 054 (methodParam != null ? new TypeDescriptor(methodParam) : TypeDescriptor.valueOf(requiredType))); 055 } 056 057 @Override 058 @Nullable 059 public <T> T convertIfNecessary(@Nullable Object value, @Nullable Class<T> requiredType, @Nullable Field field) 060 throws TypeMismatchException { 061 062 return convertIfNecessary(value, requiredType, 063 (field != null ? new TypeDescriptor(field) : TypeDescriptor.valueOf(requiredType))); 064 } 065 066 @Nullable 067 @Override 068 public <T> T convertIfNecessary(@Nullable Object value, @Nullable Class<T> requiredType, 069 @Nullable TypeDescriptor typeDescriptor) throws TypeMismatchException { 070 071 Assert.state(this.typeConverterDelegate != null, "No TypeConverterDelegate"); 072 try { 073 return this.typeConverterDelegate.convertIfNecessary(null, null, value, requiredType, typeDescriptor); 074 } 075 catch (ConverterNotFoundException | IllegalStateException ex) { 076 throw new ConversionNotSupportedException(value, requiredType, ex); 077 } 078 catch (ConversionException | IllegalArgumentException ex) { 079 throw new TypeMismatchException(value, requiredType, ex); 080 } 081 } 082 083}