/**
 * Copyright (c) 2008-2014, 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.nodes;

import java.util.List;

import org.yaml.snakeyaml.error.Mark;

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

	public MappingNode(Tag tag, boolean resolved, List<NodeTuple> value, Mark startMark, Mark endMark, Boolean flowStyle) {
		super(tag, startMark, endMark, flowStyle);
		if (value == null) {
			throw new NullPointerException("value in a Node is required.");
		}
		this.value = value;
		this.resolved = resolved;
	}

	public MappingNode(Tag tag, List<NodeTuple> value, Boolean flowStyle) {
		this(tag, true, value, null, null, flowStyle);
	}

	@Override
	public NodeId getNodeId() {
		return NodeId.mapping;
	}

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

	public void setValue(List<NodeTuple> merge) {
		value = merge;
	}

	public void setOnlyKeyType(Class<? extends Object> keyType) {
		for (NodeTuple nodes : value) {
			nodes.getKeyNode().setType(keyType);
		}
	}

	public void setTypes(Class<? extends Object> keyType, Class<? extends Object> valueType) {
		for (NodeTuple nodes : value) {
			nodes.getValueNode().setType(valueType);
			nodes.getKeyNode().setType(keyType);
		}
	}

	@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;
	}
}