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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.OpenType;
import java.util.*;

import static io.datakernel.util.JmxUtils.filterNulls;
import static io.datakernel.util.Preconditions.checkNotNull;
import static java.util.Collections.singletonList;

final class AttributeNodeForPojo implements AttributeNode {
	private static final char ATTRIBUTE_NAME_SEPARATOR = '_';

	private final String name;
	private final String description;
	private final ValueFetcher fetcher;
	private final JmxReducer reducer;
	private final Map fullNameToNode;
	private final List subNodes;
	private boolean visible;

	public AttributeNodeForPojo(String name, String description, boolean visible,
	                            ValueFetcher fetcher, JmxReducer reducer,
	                            List subNodes) {
		this.name = name;
		this.description = description;
		this.visible = visible;
		this.fetcher = fetcher;
		this.reducer = reducer;
		this.fullNameToNode = createFullNameToNodeMapping(name, subNodes);
		this.subNodes = subNodes;
	}

	private static Map createFullNameToNodeMapping(String name,
	                                                                      List subNodes) {
		Map fullNameToNodeMapping = new HashMap<>();
		for (AttributeNode subNode : subNodes) {
			Set currentSubAttrNames = subNode.getAllAttributes();
			for (String currentSubAttrName : currentSubAttrNames) {
				String currentAttrFullName = addPrefix(currentSubAttrName, name);
				if (fullNameToNodeMapping.containsKey(currentAttrFullName)) {
					throw new IllegalArgumentException(
							"There are several attributes with same name: " + currentSubAttrName);
				}
				fullNameToNodeMapping.put(currentAttrFullName, subNode);
			}
		}
		return fullNameToNodeMapping;
	}

	@Override
	public String getName() {
		return name;
	}

	@Override
	public Set getAllAttributes() {
		return fullNameToNode.keySet();
	}

	@Override
	public Set getVisibleAttributes() {
		if (!visible) {
			return Collections.emptySet();
		} else {
			Set allVisibleAttrs = new HashSet<>();
			for (AttributeNode subNode : subNodes) {
				Set visibleSubAttrs = subNode.getVisibleAttributes();
				for (String visibleSubAttr : visibleSubAttrs) {
					String visibleAttr = addPrefix(visibleSubAttr);
					allVisibleAttrs.add(visibleAttr);
				}
			}
			return allVisibleAttrs;
		}
	}

	@Override
	public Map> getDescriptions() {
		Map> nameToDescriptions = new HashMap<>();
		for (AttributeNode subNode : subNodes) {
			Map> currentSubNodeDescriptions = subNode.getDescriptions();
			for (String subNodeAttrName : currentSubNodeDescriptions.keySet()) {
				String resultAttrName = addPrefix(subNodeAttrName);
				Map curDescriptions = new LinkedHashMap<>();
				if (description != null) {
					curDescriptions.put(name, description);
				}
				curDescriptions.putAll(currentSubNodeDescriptions.get(subNodeAttrName));
				nameToDescriptions.put(resultAttrName, curDescriptions);
			}
		}
		return nameToDescriptions;
	}

	@Override
	public Map> getOpenTypes() {
		Map> allTypes = new HashMap<>();
		for (AttributeNode subNode : subNodes) {
			Map> subAttrTypes = subNode.getOpenTypes();
			for (String subAttrName : subAttrTypes.keySet()) {
				OpenType attrType = subAttrTypes.get(subAttrName);
				String attrName = addPrefix(subAttrName);
				allTypes.put(attrName, attrType);
			}
		}
		return allTypes;
	}

	@Override
	@SuppressWarnings("unchecked")
	public Map aggregateAttributes(Set attrNames, List sources) {
		checkNotNull(sources);
		checkNotNull(attrNames);
		List notNullSources = filterNulls(sources);
		if (notNullSources.size() == 0 || attrNames.isEmpty()) {
			Map nullMap = new HashMap<>();
			for (String attrName : attrNames) {
				nullMap.put(attrName, null);
			}
			return nullMap;
		}

		Map> groupedAttrs = groupBySubnode(attrNames);

		List