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/*-
* ============LICENSE_START=======================================================
* ONAP : APPC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Copyright (C) 2017 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.
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
* ============LICENSE_END=========================================================
*/
package org.onap.appc.rankingframework.impl;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.onap.appc.rankingframework.RankedAttributesContext;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
class BacktraceStrategy implements Strategy {
private final EELFLogger logger = EELFManager.getInstance().getLogger(BacktraceStrategy.class);
@Override
public <R> R resolve(CompositeNode<R> rootNode, List<String> rankedNames, RankedAttributesContext context) {
logEntryPath(rankedNames, context);
Set<String> visited = new HashSet<>();
CompositeNode<R> parentNode = rootNode;
int depth = 0;
boolean stop = false;
R result = null;
String attribute = null;
Object value = null;
do {
if (value == null) {
attribute = rankedNames.get(depth);
value = Utils.value(context.getAttributeValue(attribute));
}
Node<R> childNode = getChildNode(parentNode, visited, attribute, value);
if (childNode != null) {
switch (childNode.type()) {
case COMPOSITE:
depth++;
value = null;
parentNode = (CompositeNode<R>) childNode;
break;
case LEAF:
log("Result node has been resolved succesfully - '%s'", childNode);
result = ((LeafNode<R>) childNode).result();
stop = true;
break;
default:
throw new IllegalStateException(childNode.type().name());
}
} else {
if (!(Constants.DEFAULT_MATCH).equals(value)) {
logger.debug("Exact match didn't work, trying the default option, if any");
value = Constants.DEFAULT_MATCH;
} else if (depth > 0) {
log("Exact match didn't work and no default option available beneath '%s' - moving out",
parentNode);
depth--;
value = null;
parentNode = parentNode.parent();
} else {
logger.debug("Didn't success to resolve the path - stopping without result");
stop = true;
}
}
} while (!stop);
return result;
}
private <R> Node<R> getChildNode(CompositeNode<R> parentNode, Set<String> visited, String attribute, Object value) {
Node<R> childNode = parentNode.children().get(value);
if (childNode != null) {
log("Found matching node '%s' - checking it out", childNode);
if (!visited.add(childNode.id())) {
log("The matching node '%s' was checked before - ignoring it", childNode);
childNode = null;
}
} else {
log("Node '%s/{%s = %s}' not found - falling back",
parentNode, attribute, value != null ? value : "NULL");
}
return childNode;
}
private void logEntryPath(List<String> rankedNames, RankedAttributesContext context){
if (logger.isDebugEnabled()) {
StringBuilder buff = new StringBuilder(128);
for (String name : rankedNames) {
buff.append("/{")
.append(name)
.append(" = ")
.append(Utils.value(context.getAttributeValue(name)))
.append('}');
}
logger.debug(String.format("Trying to resolve path: %s", buff));
}
}
private void log(String log, Object... args) {
if (logger.isDebugEnabled()) {
logger.debug(String.format(log, args));
}
}
}
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