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An intelligent way of booting complex applications and services according to their dependencies
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/*
 * Copyright (C) 2015 SoftIndex LLC.
 *
 * 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 io.datakernel.jmx;

import javax.management.openmbean.*;
import java.util.*;

import static io.datakernel.util.CollectionUtils.first;
import static io.datakernel.util.Preconditions.checkArgument;
import static java.util.Collections.emptyList;

final class AttributeNodeForMap extends AttributeNodeForLeafAbstract {
	private static final String KEY_COLUMN_NAME = "> key";
	private static final String VALUE_COLUMN_NAME = "value";
	private static final String EMPTY_COLUMN_NAME = "default";
	private static final String ROW_TYPE_NAME = "RowType";
	private static final String TABULAR_TYPE_NAME = "TabularType";

	private final AttributeNode subNode;
	private final TabularType tabularType;
	private final boolean isMapOfJmxRefreshable;

	public AttributeNodeForMap(String name, String description, boolean visible,
	                           ValueFetcher fetcher, AttributeNode subNode, boolean isMapOfJmxRefreshable) {
		super(name, description, fetcher, visible);
		checkArgument(!name.isEmpty(), "Map attribute cannot have empty name");
		this.tabularType = createTabularType(subNode, name);
		this.subNode = subNode;
		this.isMapOfJmxRefreshable = isMapOfJmxRefreshable;
	}

	private static TabularType createTabularType(AttributeNode subNode, String name) {
		String nodeName = "Attribute name = " + name;

		Set visibleAttrs = subNode.getVisibleAttributes();
		Map> attrTypes = subNode.getOpenTypes();

		if (visibleAttrs.size() == 0) {
			throw new IllegalArgumentException("Arrays must have at least one visible attribute. " + nodeName);
		}

		Map> attrNameToType = new HashMap<>();
		attrNameToType.put(KEY_COLUMN_NAME, SimpleType.STRING);
		if (visibleAttrs.size() == 1) {
			String attrName = first(visibleAttrs);
			OpenType attrType = attrTypes.get(attrName);
			String adjustedAttrName = attrName.isEmpty() ? VALUE_COLUMN_NAME : attrName;
			attrNameToType.put(adjustedAttrName, attrType);
		} else {
			for (String attrName : visibleAttrs) {
				OpenType attrType = attrTypes.get(attrName);
				String adjustedAttrName = attrName.isEmpty() ? EMPTY_COLUMN_NAME : attrName;

				if (attrNameToType.containsKey(adjustedAttrName)) {
					throw new IllegalArgumentException("In case of empty attribute name there must not be another " +
							"empty attribute and attribute with name \"default\"." + nodeName);
				}

				attrNameToType.put(attrName, attrType);
			}
		}

		List columnNames = new ArrayList<>();
		List> columnTypes = new ArrayList<>();
		for (String subAttrName : attrNameToType.keySet()) {
			OpenType subAttrType = attrNameToType.get(subAttrName);
			columnNames.add(subAttrName);
			columnTypes.add(subAttrType);
		}
		String[] columnNamesArr = columnNames.toArray(new String[columnNames.size()]);
		OpenType[] columnTypesArr = columnTypes.toArray(new OpenType[columnTypes.size()]);

		try {
			return new TabularType(
					TABULAR_TYPE_NAME,
					TABULAR_TYPE_NAME,
					new CompositeType(ROW_TYPE_NAME, ROW_TYPE_NAME, columnNamesArr, columnNamesArr, columnTypesArr),
					new String[]{KEY_COLUMN_NAME}
			);
		} catch (OpenDataException e) {
			throw new IllegalArgumentException("Cannot create TabularType. " + nodeName, e);
		}
	}

	@Override
	public Map> getOpenTypes() {
		return Collections.>singletonMap(name, tabularType);
	}

	@Override
	public Object aggregateAttribute(String attrName, List sources) {
		Map> groupedByKey = fetchMapsAndGroupEntriesByKey(sources);

		if (groupedByKey.size() == 0) {
			return null;
		}

		TabularDataSupport tdSupport = new TabularDataSupport(tabularType);
		Set visibleSubAttrs = subNode.getVisibleAttributes();
		for (Object key : groupedByKey.keySet()) {
			List