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/*
* Copyright © 2016-2018 European Support Limited
*
* 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.onap.config.impl;
import static org.onap.config.Constants.LOAD_ORDER_KEY;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import org.apache.commons.configuration2.CombinedConfiguration;
import org.apache.commons.configuration2.Configuration;
import org.apache.commons.configuration2.ex.ConfigurationException;
import org.apache.commons.configuration2.tree.MergeCombiner;
import org.apache.commons.configuration2.tree.OverrideCombiner;
import org.apache.commons.configuration2.tree.UnionCombiner;
import org.onap.config.ConfigurationUtils;
import org.onap.config.type.ConfigurationMode;
public final class AggregateConfiguration {
private final Map<String, Configuration> rootConfig = Collections.synchronizedMap(new HashMap<>());
private final Map<String, Configuration> unionConfig = Collections.synchronizedMap(new HashMap<>());
private final Map<String, Configuration> mergeConfig = Collections.synchronizedMap(new HashMap<>());
private final Map<String, Configuration> overrideConfig = Collections.synchronizedMap(new LinkedHashMap<>());
public void addConfig(File file) throws ConfigurationException {
addConfig(fileToUrl(file), ConfigurationUtils.getMergeStrategy(file),
ConfigurationUtils.getConfigurationBuilder(file).getConfiguration());
}
public void addConfig(URL url) throws ConfigurationException {
addConfig(url, ConfigurationUtils.getMergeStrategy(url),
ConfigurationUtils.getConfigurationBuilder(url).getConfiguration());
}
private void addConfig(URL url, ConfigurationMode configMode, Configuration config) {
String normalizedUrl = normalize(url);
if (configMode != null) {
switch (configMode) {
case MERGE:
mergeConfig.put(normalizedUrl, config);
break;
case OVERRIDE:
overrideConfig.put(normalizedUrl, config);
break;
case UNION:
unionConfig.put(normalizedUrl, config);
break;
default:
}
} else {
rootConfig.put(normalizedUrl, config);
}
}
private String normalize(URL url) {
// what about Linux where paths are case sensitive?
return url.toString().toUpperCase();
}
private URL fileToUrl(File file) {
try {
return file.getAbsoluteFile().toURI().toURL();
} catch (MalformedURLException e) {
throw new IllegalStateException("URL produced by JDK and is not expected to be malformed. File: "
+ file.getAbsoluteFile());
}
}
public Configuration getFinalConfiguration() {
CombinedConfiguration ccRoot = new CombinedConfiguration(new MergeCombiner());
ArrayList<Configuration> tempList = new ArrayList<>(rootConfig.values());
tempList.sort(this::sortForMerge);
for (Configuration conf : tempList) {
ccRoot.addConfiguration(conf);
}
CombinedConfiguration ccMergeRoot = new CombinedConfiguration(new MergeCombiner());
ccMergeRoot.addConfiguration(ccRoot);
tempList = new ArrayList<>(mergeConfig.values());
tempList.sort(this::sortForMerge);
for (Configuration conf : tempList) {
ccMergeRoot.addConfiguration(conf);
}
CombinedConfiguration ccUnionRoot = new CombinedConfiguration(new UnionCombiner());
ccUnionRoot.addConfiguration(ccMergeRoot);
for (Configuration conf : unionConfig.values()) {
ccUnionRoot.addConfiguration(conf);
}
ArrayList<Configuration> tempOverrideConfigs = new ArrayList<>(overrideConfig.values());
Collections.reverse(tempOverrideConfigs);
tempOverrideConfigs.sort(this::sortForOverride);
CombinedConfiguration ccOverrideRoot = new CombinedConfiguration(new OverrideCombiner());
for (Configuration conf : tempOverrideConfigs) {
ccOverrideRoot.addConfiguration(conf);
}
ccOverrideRoot.addConfiguration(ccUnionRoot);
return ccOverrideRoot;
}
private int sortForOverride(Configuration conf1, Configuration conf2) {
return sort(conf1, conf2, (o1, o2) -> o2 - o1);
}
private int sortForMerge(Configuration conf1, Configuration conf2) {
return sort(conf1, conf2, (o1, o2) -> o1 - o2);
}
private int sort(Configuration conf1, Configuration conf2, Comparator<Integer> comparator) {
int order1 = readLoadOrder(conf1);
int order2 = readLoadOrder(conf2);
return comparator.compare(order1, order2);
}
private int readLoadOrder(Configuration conf) {
String order = conf.getString(LOAD_ORDER_KEY);
if (ConfigurationUtils.isBlank(order) || !order.trim().matches("\\d+")) {
return 0;
}
return Integer.parseInt(order.trim());
}
}
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