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/*
* ============LICENSE_START===================================================
* Copyright (c) 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.pomba.contextaggregator.config;
import static java.lang.String.format;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.onap.pomba.contextaggregator.builder.ContextBuilder;
import org.onap.pomba.contextaggregator.exception.ContextAggregatorError;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.ResourcePatternResolver;
@Configuration
public class BuilderConfigLoader {
private static Logger log = LoggerFactory.getLogger(BuilderConfigLoader.class);
private static final Resource[] EMPTY_ARRAY = new Resource[0];
private static final String[] BUILDERS_PROPERTIES_LOCATION =
{"file:./%s/*.properties", "classpath:/%s/*.properties"};
@Autowired
private ResourcePatternResolver rpr;
@Value("${builders.properties.path}")
private String buildersPropertiesPath;
/**
* Generates a list of context builders by loading property files (*.properties) from a configured
* builders location.
*
* <pre>
* The location is searched in the following order: file:./${buildersPropertiesPath} and
* classpath:/${buildersPropertiesPath} to support override of default values.
*
* @return Returns a list of context builders
*/
@Bean
public List<ContextBuilder> contextBuilders() {
try {
final Resource[] blrdsConfig = resolveBldrsConfig();
if (isEmpty(blrdsConfig)) {
log.error(ContextAggregatorError.BUILDER_PROPERTIES_NOT_FOUND
.getMessage(Arrays.toString(bldrsPropLoc2Path(buildersPropertiesPath))));
return Collections.emptyList();
}
final List<ContextBuilder> contextBuilders = new ArrayList<>();
for (Resource r : blrdsConfig) {
contextBuilders.add(new ContextBuilder(r.getInputStream(), r.getFilename()));
}
return contextBuilders;
} catch (IOException ex) {
log.error(ContextAggregatorError.FAILED_TO_LOAD_BUILDER_PROPERTIES.getMessage(ex.getMessage()));
}
return Collections.emptyList();
}
private Resource[] resolveBldrsConfig() throws IOException {
for (String p : bldrsPropLoc2Path(buildersPropertiesPath)) {
Resource[] bldrsConfig = rpr.getResources(p);
if (!isEmpty(bldrsConfig)) {
return bldrsConfig;
}
}
return EMPTY_ARRAY;
}
private static String[] bldrsPropLoc2Path(String buildersPropertiesPath) {
String[] res = new String[BUILDERS_PROPERTIES_LOCATION.length];
int indx = 0;
for (String tmpl : BUILDERS_PROPERTIES_LOCATION) {
res[indx++] = format(tmpl, buildersPropertiesPath).replace("//", "/");
}
return res;
}
private static boolean isEmpty(Object[] obj) {
return obj == null || obj.length == 0;
}
}
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