yaml/snakeyaml/Example2_24Test.java

/**
 * Copyright (c) 2008, 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;

import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import junit.framework.TestCase;

import org.yaml.snakeyaml.constructor.AbstractConstruct;
import org.yaml.snakeyaml.constructor.Constructor;
import org.yaml.snakeyaml.nodes.MappingNode;
import org.yaml.snakeyaml.nodes.Node;
import org.yaml.snakeyaml.nodes.SequenceNode;
import org.yaml.snakeyaml.nodes.Tag;
import org.yaml.snakeyaml.representer.Represent;
import org.yaml.snakeyaml.representer.Representer;

/**
 * Test Example 2.24 from the YAML specification
 *
 * @see <a href="http://yaml.org/spec/1.1/"></a>
 */
public class Example2_24Test extends TestCase {
    class MyConstructor extends Constructor {
        public MyConstructor() {
            this.yamlConstructors.put(new Tag("tag:clarkevans.com,2002:shape"),
                    new ConstructShape());
            this.yamlConstructors.put(new Tag("tag:clarkevans.com,2002:circle"),
                    new ConstructCircle());
            this.yamlConstructors.put(new Tag("tag:clarkevans.com,2002:line"), new ConstructLine());
            this.yamlConstructors.put(new Tag("tag:clarkevans.com,2002:label"),
                    new ConstructLabel());
        }

        private class ConstructShape extends AbstractConstruct {
            @SuppressWarnings("unchecked")
            public Object construct(Node node) {
                SequenceNode snode = (SequenceNode) node;
                List<Entity> values = (List<Entity>) constructSequence(snode);
                Shape shape = new Shape(values);
                return shape;
            }
        }

        private class ConstructCircle extends AbstractConstruct {
            @SuppressWarnings("unchecked")
            public Object construct(Node node) {
                MappingNode mnode = (MappingNode) node;
                Map<Object, Object> values = constructMapping(mnode);
                Circle circle = new Circle((Map<String, Integer>) values.get("center"),
                        (Integer) values.get("radius"));
                return circle;
            }
        }

        private class ConstructLine extends AbstractConstruct {
            @SuppressWarnings("unchecked")
            public Object construct(Node node) {
                MappingNode mnode = (MappingNode) node;
                Map<Object, Object> values = constructMapping(mnode);
                Line line = new Line((Map<String, Integer>) values.get("start"),
                        (Map<String, Integer>) values.get("finish"));
                return line;
            }
        }

        private class ConstructLabel extends AbstractConstruct {
            @SuppressWarnings("unchecked")
            public Object construct(Node node) {
                MappingNode mnode = (MappingNode) node;
                Map<Object, Object> values = constructMapping(mnode);
                Label label = new Label((Map<String, Integer>) values.get("start"),
                        (Integer) values.get("color"), (String) values.get("text"));
                return label;
            }
        }
    }

    class MyRepresenter extends Representer {
        public MyRepresenter() {
            this.representers.put(Shape.class, new RepresentShape());
            this.representers.put(Circle.class, new RepresentCircle());
            this.representers.put(Line.class, new RepresentLine());
            this.representers.put(Label.class, new RepresentLabel());
            this.representers.put(HexInteger.class, new RepresentHex());
        }

        private class RepresentShape implements Represent {
            public Node representData(Object data) {
                Shape shape = (Shape) data;
                List<Entity> value = shape.getEntities();
                return representSequence(new Tag("!shape"), value, Boolean.FALSE);
            }
        }

        private class RepresentCircle implements Represent {
            public Node representData(Object data) {
                Circle circle = (Circle) data;
                Map<String, Object> map = new TreeMap<String, Object>();
                map.put("center", circle.getCenter());
                map.put("radius", circle.getRadius());
                return representMapping(new Tag("!circle"), map, Boolean.FALSE);
            }
        }

        private class RepresentLine implements Represent {
            public Node representData(Object data) {
                Line line = (Line) data;
                Map<String, Object> map = new TreeMap<String, Object>();
                map.put("start", line.getStart());
                map.put("finish", line.getFinish());
                return representMapping(new Tag("!line"), map, Boolean.FALSE);
            }
        }

        private class RepresentLabel implements Represent {
            public Node representData(Object data) {
                Label label = (Label) data;
                Map<String, Object> map = new TreeMap<String, Object>();
                map.put("start", label.getStart());
                map.put("color", new HexInteger(label.getColor()));
                map.put("text", label.getText());
                return representMapping(new Tag("!label"), map, Boolean.FALSE);
            }
        }

        private class RepresentHex implements Represent {
            public Node representData(Object data) {
                HexInteger hex = (HexInteger) data;
                return representScalar(Tag.INT, "0x"
                        + Integer.toHexString(hex.getColor()).toUpperCase(), null);
            }
        }
    }

    private class HexInteger {
        private Integer color;

        public HexInteger(Integer color) {
            this.color = color;
        }

        public Integer getColor() {
            return color;
        }
    }

    private class Shape {
        private List<Entity> entities;

        public List<Entity> getEntities() {
            return entities;
        }

        public Shape(List<Entity> entities) {
            this.entities = entities;
        }
    }

    private class Entity {
    }

    private class Circle extends Entity {
        private Map<String, Integer> center;
        private Integer radius;

        public Circle(Map<String, Integer> center, Integer radius) {
            this.center = center;
            this.radius = radius;
        }

        public Map<String, Integer> getCenter() {
            return center;
        }

        public Integer getRadius() {
            return radius;
        }
    }

    private class Line extends Entity {
        private Map<String, Integer> start;
        private Map<String, Integer> finish;

        public Line(Map<String, Integer> start, Map<String, Integer> finish) {
            this.start = start;
            this.finish = finish;
        }

        public Map<String, Integer> getStart() {
            return start;
        }

        public Map<String, Integer> getFinish() {
            return finish;
        }
    }

    private class Label extends Entity {
        private Map<String, Integer> start;
        private Integer color;
        private String text;

        public Label(Map<String, Integer> start, Integer color, String text) {
            this.start = start;
            this.color = color;
            this.text = text;
        }

        public Map<String, Integer> getStart() {
            return start;
        }

        public Integer getColor() {
            return color;
        }

        public String getText() {
            return text;
        }
    }

    public void testExample_2_24() {
        Yaml yaml = new Yaml(new MyConstructor());
        Shape shape = (Shape) yaml.load(Util.getLocalResource("specification/example2_24.yaml"));
        assertNotNull(shape);
        yaml = new Yaml(new MyRepresenter());
        String output = yaml.dump(shape);
        String etalon = Util.getLocalResource("specification/example2_24_dumped.yaml");
        assertEquals(etalon, output);
    }
}