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Core YAML 1.2 parser and emitter for Java
There is a newer version: 2.9
/**
 * Copyright (c) 2018, 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.snakeyaml.engine.v2.nodes;

import org.snakeyaml.engine.v2.common.FlowStyle;
import org.snakeyaml.engine.v2.exceptions.Mark;

import java.util.List;
import java.util.Objects;
import java.util.Optional;


/**
 * Represents a map.
 * 

 * A map is a collection of unsorted key-value pairs.
 * 
 */
public class MappingNode extends CollectionNode {
    private List value;
    private boolean merged = false;

    public MappingNode(Tag tag, boolean resolved, List value, FlowStyle flowStyle, Optional startMark, Optional endMark) {
        super(tag, flowStyle, startMark, endMark);
        Objects.requireNonNull("value in a Node is required.");
        this.value = value;
        this.resolved = resolved;
    }

    public MappingNode(Tag tag, List value, FlowStyle flowStyle) {
        this(tag, true, value, flowStyle, Optional.empty(), Optional.empty());
    }

    @Override
    public NodeType getNodeType() {
        return NodeType.MAPPING;
    }

    /**
     * Returns the entries of this map.
     *
     * @return List of entries.
     */
    public List getValue() {
        return value;
    }

    public void setValue(List mergedValue) {
        value = mergedValue;
    }

    @Override
    public String toString() {
        String values;
        StringBuilder buf = new StringBuilder();
        for (NodeTuple node : getValue()) {
            buf.append("{ key=");
            buf.append(node.getKeyNode());
            buf.append("; value=");
            if (node.getValueNode() instanceof CollectionNode) {
                // to avoid overflow in case of recursive structures
                buf.append(System.identityHashCode(node.getValueNode()));
            } else {
                buf.append(node.toString());
            }
            buf.append(" }");
        }
        values = buf.toString();
        return "<" + this.getClass().getName() + " (tag=" + getTag() + ", values=" + values + ")>";
    }

    /**
     * @param merged - true if map contains merge node
     */
    public void setMerged(boolean merged) {
        this.merged = merged;
    }

    /**
     * @return true if map contains merge node
     */
    public boolean isMerged() {
        return merged;
    }
}