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/*-
* ============LICENSE_START=======================================================
* sdc-distribution-client
* ================================================================================
* Copyright (C) 2017 AT&T 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.utils;
import java.beans.IntrospectionException;
import java.io.File;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;
import org.onap.sdc.utils.heat.HeatConfiguration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.yaml.snakeyaml.TypeDescription;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.introspector.BeanAccess;
import org.yaml.snakeyaml.introspector.Property;
import org.yaml.snakeyaml.introspector.PropertyUtils;
public class YamlToObjectConverter {
private static Logger log = LoggerFactory
.getLogger(YamlToObjectConverter.class.getName());
private static final Map<String, Yaml> YAMLS = new HashMap<>();
private static final Yaml DEFAULT_YAML = new Yaml();
static {
YAMLS.put(HeatConfiguration.class.getName(), provideYamlForHeatConfiguration());
}
private static Yaml provideYamlForHeatConfiguration() {
org.yaml.snakeyaml.constructor.Constructor heatConstructor = new org.yaml.snakeyaml.constructor.Constructor(HeatConfiguration.class);
TypeDescription heatDescription = new TypeDescription(HeatConfiguration.class);
heatConstructor.addTypeDescription(heatDescription);
PropertyUtils propertyUtils = new PropertyUtils() {
@Override
//This is in order to workaround "default" field in HeatParameterEntry, since default is Java keyword
public Property getProperty(Class<?> type, String name, BeanAccess bAccess) {
name = name.substring(0, 1).toLowerCase() + name.substring(1);
return super.getProperty(type, name, bAccess);
}
};
//Skip properties which are not found - we only are interested in "parameters"
propertyUtils.setSkipMissingProperties(true);
heatConstructor.setPropertyUtils(propertyUtils);
return new Yaml(heatConstructor);
}
public <T> T convert(String dirPath, Class<T> className,
String configFileName) {
T config = null;
try {
String fullFileName = dirPath + File.separator + configFileName;
config = convert(fullFileName, className);
} catch (Exception e) {
log.error("Failed to convert yaml file {} to object.", configFileName, e);
}
return config;
}
public <T> T convert(String fullFileName, Class<T> className) {
T config = null;
Yaml yaml = getYamlByClassName(className);
try {
File f = new File(fullFileName);
if (!f.exists()) {
log.warn("The file {} cannot be found. Ignore reading configuration.", fullFileName);
} else {
try (InputStream in = Files.newInputStream(Paths.get(fullFileName))) {
config = yaml.loadAs(in, className);
}
}
} catch (Exception e) {
log.error("Failed to convert yaml file {} to object.", fullFileName, e);
}
return config;
}
public <T> T convertFromString(String yamlContents, Class<T> className) {
T config = null;
try {
Yaml yaml = getYamlByClassName(className);
config = yaml.loadAs(yamlContents, className);
} catch (Exception e) {
log.error("Failed to convert YAML {} to object.", yamlContents, e);
}
return config;
}
private static synchronized <T> Yaml getYamlByClassName(Class<T> className) {
Yaml yaml = YAMLS.get(className.getName());
if (yaml == null) {
yaml = DEFAULT_YAML;
}
return yaml;
}
}
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