001/*
002 * Copyright 2002-2017 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.core.convert.support;
018
019import java.beans.PropertyEditorSupport;
020
021import org.springframework.core.convert.ConversionService;
022import org.springframework.core.convert.TypeDescriptor;
023import org.springframework.lang.Nullable;
024import org.springframework.util.Assert;
025
026/**
027 * Adapter that exposes a {@link java.beans.PropertyEditor} for any given
028 * {@link org.springframework.core.convert.ConversionService} and specific target type.
029 *
030 * @author Juergen Hoeller
031 * @since 3.0
032 */
033public class ConvertingPropertyEditorAdapter extends PropertyEditorSupport {
034
035        private final ConversionService conversionService;
036
037        private final TypeDescriptor targetDescriptor;
038
039        private final boolean canConvertToString;
040
041
042        /**
043         * Create a new ConvertingPropertyEditorAdapter for a given
044         * {@link org.springframework.core.convert.ConversionService}
045         * and the given target type.
046         * @param conversionService the ConversionService to delegate to
047         * @param targetDescriptor the target type to convert to
048         */
049        public ConvertingPropertyEditorAdapter(ConversionService conversionService, TypeDescriptor targetDescriptor) {
050                Assert.notNull(conversionService, "ConversionService must not be null");
051                Assert.notNull(targetDescriptor, "TypeDescriptor must not be null");
052                this.conversionService = conversionService;
053                this.targetDescriptor = targetDescriptor;
054                this.canConvertToString = conversionService.canConvert(this.targetDescriptor, TypeDescriptor.valueOf(String.class));
055        }
056
057
058        @Override
059        public void setAsText(@Nullable String text) throws IllegalArgumentException {
060                setValue(this.conversionService.convert(text, TypeDescriptor.valueOf(String.class), this.targetDescriptor));
061        }
062
063        @Override
064        @Nullable
065        public String getAsText() {
066                if (this.canConvertToString) {
067                        return (String) this.conversionService.convert(getValue(), this.targetDescriptor, TypeDescriptor.valueOf(String.class));
068                }
069                else {
070                        return null;
071                }
072        }
073
074}