src/test/java/org/yaml/snakeyaml/issues/issue64/ParameterizedTypeTest.java

/**
 * Copyright (c) 2008-2010, http://www.snakeyaml.org
 *
 * 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.yaml.snakeyaml.issues.issue64;

import java.util.LinkedList;
import java.util.List;

import junit.framework.TestCase;

import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.AbstractConstruct;
import org.yaml.snakeyaml.constructor.Constructor;
import org.yaml.snakeyaml.nodes.Node;
import org.yaml.snakeyaml.nodes.ScalarNode;
import org.yaml.snakeyaml.nodes.Tag;
import org.yaml.snakeyaml.representer.Represent;
import org.yaml.snakeyaml.representer.Representer;

public class ParameterizedTypeTest extends TestCase {

    public void testRepresenter() {
        Yaml yaml = new Yaml(new ClassConstructor(), new ClassRepresenter());

        String methodName = "testMethod";
        List<Class<?>> argTypes = new LinkedList<Class<?>>();
        argTypes.add(String.class);
        argTypes.add(Integer.class);
        argTypes.add(Boolean.class);
        MethodDesc methodDesc = new MethodDesc(methodName, argTypes);

        String out = yaml.dump(methodDesc);
        // System.out.println(out);
        assertEquals(
                "!!org.yaml.snakeyaml.issues.issue64.MethodDesc\nargTypes: [!clazz 'String', !clazz 'Integer', !clazz 'Boolean']\nname: testMethod\n",
                out);
        MethodDesc parsed = (MethodDesc) yaml.load(out);
        assertEquals(methodName, parsed.getName());
        List<Class<?>> argTypes2 = parsed.getArgTypes();
        assertEquals(3, argTypes2.size());
        assertEquals(argTypes, argTypes2);
    }

    static class ClassRepresenter extends Representer {
        public ClassRepresenter() {
            this.representers.put(Class.class, new RepresentClass());
        }

        private class RepresentClass implements Represent {
            public Node representData(Object data) {
                Class<?> clazz = (Class<?>) data;
                return representScalar(new Tag("!clazz"), clazz.getSimpleName());
            }
        }
    }

    static class ClassConstructor extends Constructor {
        public ClassConstructor() {
            this.yamlConstructors.put(new Tag("!clazz"), new ConstructClass());
        }

        private class ConstructClass extends AbstractConstruct {

            public Object construct(Node node) {
                String clazz = (String) constructScalar((ScalarNode) node);
                try {
                    return Class.forName("java.lang." + clazz);
                } catch (ClassNotFoundException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }
}