gistfile1.java

/*
 * Copyright 2002-2013 the original author or authors.
 *
 * Licensed 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.springframework.core.convert.support;

import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.junit.Test;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.converter.Converter;

import static org.hamcrest.Matchers.*;
import static org.junit.Assert.*;


public class MapToMapTests {

  public Map<String, Map<String, List<Map<String, String>>>> source;

	public Map<String, Map<String, Set<ConfigurationDescriptor>>> target;

	@SuppressWarnings("unchecked")
	@Test
	public void mapToMap() throws Exception {
		DefaultConversionService conversionService = new DefaultConversionService();
		conversionService.addConverter(new MapToConfigurationDescriptorConverter());
		TypeDescriptor sourceType = new TypeDescriptor(getClass().getDeclaredField("source"));
		TypeDescriptor targetType = new TypeDescriptor(getClass().getDeclaredField("target"));

		Map<String, List<Map<String, String>>> entry = new HashMap<String, List<Map<String, String>>>();
		entry.put("b", Arrays.asList(Collections.singletonMap("c", "d")));
		this.source = new HashMap<String, Map<String, List<Map<String, String>>>>();
		this.source.put("a", entry);

		this.target = (Map<String, Map<String, Set<ConfigurationDescriptor>>>) conversionService.convert(this.source, targetType);

		assertThat(sourceType.isAssignableTo(targetType), equalTo(false));
		assertThat(conversionService.canConvert(sourceType, targetType), equalTo(true));
		assertThat(target.get("a").get("b"), instanceOf(Set.class));
		assertThat(target.get("a").get("b").iterator().next().toString(), equalTo("[c=d]"));
	}

	private static class MapToConfigurationDescriptorConverter implements Converter<Map<String, String>, ConfigurationDescriptor> {

		@Override
		public ConfigurationDescriptor convert(Map<String, String> source) {
			return new ConfigurationDescriptor(source.entrySet());
		}

	}

	public static class ConfigurationDescriptor {

		private String s;

		public ConfigurationDescriptor(Set<Entry<String, String>> entrySet) {
			this.s = entrySet.toString();
		}

		@Override
		public String toString() {
			return this.s;
		}
	}

}