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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
* Copyright © 2017-2018 Amdocs
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.crud.util.etag;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import org.onap.crud.event.GraphEventEdge;
import org.onap.crud.event.GraphEventVertex;
import org.onap.crud.util.HashGenerator;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
/**
* Computes hash for GraphEventVertex and GraphEventEdge
*/
public class EtagGenerator {
private static final String AAI_LAST_MOD_TS = "aai-last-mod-ts";
private final HashGenerator hashGenerator;
public EtagGenerator() throws NoSuchAlgorithmException {
this.hashGenerator = new HashGenerator();
}
/**
* Takes in the GraphEventVertex for which the hash is to be computed.
* @param GraphEventVertex
* @return hash for the GraphEventVertex
* @throws IOException
*/
public String computeHashForVertex(GraphEventVertex graphEventVertex) throws IOException {
return hashGenerator.generateSHA256AsHex(graphEventVertex.getId(), graphEventVertex.getType(), convertPropertiesToMap(graphEventVertex.getProperties()));
}
/**
* Takes in the GraphEventEdge for which the hash is to be computed.
* @param GraphEventEdge
* @return hash for the GraphEventEdge
* @throws IOException
*/
public String computeHashForEdge(GraphEventEdge graphEventEdge) throws IOException {
return hashGenerator.generateSHA256AsHex(graphEventEdge.getId(), graphEventEdge.getType(),
convertPropertiesToMap(graphEventEdge.getProperties()),
computeHashForVertex(graphEventEdge.getSource()), computeHashForVertex(graphEventEdge.getTarget()));
}
private Map<String, Object> convertPropertiesToMap(JsonElement properties) {
Map<String, Object> propertiesMap = new HashMap<>();
if (null != properties) {
JsonObject propsObject = properties.getAsJsonObject();
for (Entry<String, JsonElement> props : propsObject.entrySet()) {
String key = props.getKey();
String value = props.getValue().getAsString();
propertiesMap.put(key, value);
}
}
return filterAndSortProperties(propertiesMap);
}
private Map<String, Object> filterAndSortProperties(Map<String, Object> properties) {
return properties
.entrySet()
.stream()
.filter(x -> !x.getKey().equals(AAI_LAST_MOD_TS))
.sorted((x, y) -> x.getKey().compareTo(y.getKey()))
.collect(LinkedHashMap::new,
(m, e) -> m.put(e.getKey(), e.getValue()),
Map::putAll);
}
}
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