/*
 * Copyright 2016-2018 shardingsphere.io.
 * <p>
 * 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.
 * </p>
 */

package io.shardingsphere.orchestration.internal.yaml.representer;

import org.yaml.snakeyaml.introspector.Property;
import org.yaml.snakeyaml.nodes.CollectionNode;
import org.yaml.snakeyaml.nodes.MappingNode;
import org.yaml.snakeyaml.nodes.Node;
import org.yaml.snakeyaml.nodes.NodeTuple;
import org.yaml.snakeyaml.nodes.ScalarNode;
import org.yaml.snakeyaml.nodes.SequenceNode;
import org.yaml.snakeyaml.nodes.Tag;
import org.yaml.snakeyaml.representer.Representer;

import java.util.Collection;
import java.util.HashSet;

/**
 * Data source representer.
 *
 * @author panjuan
 */
public final class ShardingConfigurationRepresenter extends Representer {
    
    private static Collection<String> eliminatedPropertyNames = new HashSet<>();
    
    static {
        eliminatedPropertyNames.add("configMap");
        eliminatedPropertyNames.add("props");
    }
    
    @Override
    protected NodeTuple representJavaBeanProperty(final Object javaBean, final Property property, final Object propertyValue, final Tag customTag) {
        NodeTuple tuple = super.representJavaBeanProperty(javaBean, property, propertyValue, customTag);
        Node valueNode = tuple.getValueNode();
        Node keyNode = tuple.getKeyNode();
        if (isEliminatedPropertyName(keyNode)) {
            return null;
        }
        if (Tag.NULL.equals(valueNode.getTag())) {
            return null;
        }
        if (valueNode instanceof CollectionNode) {
            if (Tag.SEQ.equals(valueNode.getTag()) && ((SequenceNode) valueNode).getValue().isEmpty()) {
                return null;
            }
            if (Tag.MAP.equals(valueNode.getTag()) && ((MappingNode) valueNode).getValue().isEmpty()) {
                return null;
            }
        }
        return tuple;
    }
    
    private boolean isEliminatedPropertyName(final Node keyNode) {
        return keyNode instanceof ScalarNode && eliminatedPropertyNames.contains(((ScalarNode) keyNode).getValue());
    }
    
//    private class NullRepresent implements Represent {
//        public Node representData(final Object data) {
//            return representScalar(Tag.NULL, "");
//        }
//    }
}

@@ -2593,197 +2593,6 @@
   %7D%0A
-    %0A//    private class NullRepresent implements Represent %7B%0A//        public Node representData(final Object data) %7B%0A//            return representScalar(Tag.NULL, %22%22);%0A//        %7D%0A//    %7D%0A
 %7D%0A

delete NullRepresent