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/*
* ============LICENSE_START=======================================================
* GAB
* ================================================================================
* Copyright (C) 2019 Nokia Intellectual Property. All rights reserved.
* ================================================================================
* 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.sdc.gab.yaml;
import java.io.IOException;
import java.util.AbstractMap.SimpleEntry;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;
import org.onap.sdc.gab.model.GABResult;
import org.onap.sdc.gab.model.GABResultEntry;
import org.onap.sdc.gab.model.GABResults;
/**
* Yaml parser and searcher for GAB. Requires 3 steps:
*
* <br>1. Load content of Yaml file using {@link #parseContent(String)} or {@link #parseFile(String)}
* <br>2. Provide keywords to search using {@link #filter(String)} or {@link #filter(Set)}
* <br>3. Collect the results using {@link #collect()}
*/
public class GABYamlParser implements AutoCloseable {
private YamlParser yamlParser;
public GABYamlParser(YamlParser yamlParser) {
this.yamlParser = yamlParser;
}
/**
* Provides yaml path for processing.
*
* @param path Yaml file path.
* @return Same parser with loaded source.
*/
public GABYamlParser parseFile(String path) {
yamlParser.parseFile(path);
return this;
}
/**
* Provides yaml content for processing.
*
* @param content Yaml file content.
* @return Same parser with loaded source.
*/
public GABYamlParser parseContent(String content) {
yamlParser.parseContent(content);
return this;
}
/**
* Adds set of filters for processing.
*
* @param filters correct json paths for searching resources.
* @return Same parser with loaded filters.
*/
public GABYamlParser filter(Set<String> filters) {
yamlParser.filter(filters);
return this;
}
/**
* Adds single filter for processing.
*
* @param filter correct json path for searching resource.
* @return Same parser with loaded filter.
*/
public GABYamlParser filter(String filter) {
yamlParser.filter(filter);
return this;
}
/**
* Collects the results from parsed yaml file and applied filters.
*
* @exception IOException Means that yaml file has invalid content.
* @return {@link GABResults}
*/
public GABResults collect() throws IOException {
return new GABResults(yamlParser.collect().stream()
.map(results -> new GABResult(createGabResultEntryList(results)))
.collect(Collectors.toList()));
}
private List<GABResultEntry> createGabResultEntryList(List<SimpleEntry<String, ? extends Collection<Object>>> parsedContent) {
return Objects.isNull(parsedContent) ? Collections.emptyList() : parsedContent.stream()
.map(result -> result.getValue().stream()
.map(entry -> new GABResultEntry(result.getKey(), entry))
.collect(Collectors.toList())).flatMap(Collection::stream)
.collect(Collectors.toList());
}
@Override
public void close() throws IOException {
yamlParser.close();
}
}
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