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/**
* Copyright 2015 Netflix, Inc.
*
* 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.
*/
package com.netflix.archaius.readers;
import com.netflix.archaius.api.Config;
import com.netflix.archaius.api.ConfigReader;
import com.netflix.archaius.api.StrInterpolator;
import com.netflix.archaius.api.config.CompositeConfig;
import com.netflix.archaius.api.exceptions.ConfigException;
import com.netflix.archaius.config.DefaultCompositeConfig;
import com.netflix.archaius.config.DefaultCompositeConfig.Builder;
import com.netflix.archaius.config.MapConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.net.URLDecoder;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
public class PropertiesConfigReader implements ConfigReader {
private static final Logger LOG = LoggerFactory.getLogger(PropertiesConfigReader.class);
private static final String[] INCLUDE_KEYS = { "@next", "netflixconfiguration.properties.nextLoad" };
private static final String SUFFIX = ".properties";
@Override
public Config load(ClassLoader loader, String resourceName, StrInterpolator strInterpolator, StrInterpolator.Lookup lookup) throws ConfigException {
Builder builder = DefaultCompositeConfig.builder();
Collection resources = getResources(loader, resourceName);
if (resources.size() > 1) {
LOG.warn("Multiple resource files found for {}. {}." +
" All resources will be loaded with override order undefined.",
resourceName, resources);
}
for (URL url : resources) {
builder.withConfig(url.toString(), load(loader, url, strInterpolator, lookup));
}
CompositeConfig config = builder.build();
if (config.getConfigNames().isEmpty()) {
throw new ConfigException("No resources found for '" + resourceName + SUFFIX + "'");
}
return config;
}
@Override
public Config load(ClassLoader loader, URL url, StrInterpolator strInterpolator, StrInterpolator.Lookup lookup) throws ConfigException {
Properties props = new Properties();
internalLoad(props, new HashSet(), loader, url, strInterpolator, lookup);
return MapConfig.from(props);
}
private void internalLoad(Properties props, Set seenUrls, ClassLoader loader, URL url, StrInterpolator strInterpolator, StrInterpolator.Lookup lookup) {
LOG.debug("Attempting to load : {}", url.toExternalForm());
// Guard against circular dependencies
if (!seenUrls.contains(url.toExternalForm())) {
seenUrls.add(url.toExternalForm());
try {
// Load properties into the single Properties object overriding any property
// that may already exist
Map p = new URLConfigReader(url).call().getToAdd();
LOG.debug("Loaded : {}", url.toExternalForm());
props.putAll(p);
// Recursively load any files referenced by one of several 'include' properties
// in the file. The property value contains a list of URL's to load, where the
// last loaded file wins for any individual property collisions.
for (String nextLoadPropName : INCLUDE_KEYS) {
String nextLoadValue = (String)props.remove(nextLoadPropName);
if (nextLoadValue != null) {
for (String urlString : nextLoadValue.split(",")) {
for (URL nextUrl : getResources(loader, strInterpolator.create(lookup).resolve(urlString))) {
internalLoad(props, seenUrls, loader, nextUrl, strInterpolator, lookup);
}
}
}
}
} catch (IOException e) {
LOG.debug("Unable to load configuration file {}. {}", url, e.getMessage());
}
}
else {
LOG.debug("Circular dependency trying to load url : {}", url.toExternalForm());
}
}
@Override
public boolean canLoad(ClassLoader loader, String name) {
return getResources(loader, name) != null;
}
@Override
public boolean canLoad(ClassLoader loader, URL uri) {
return uri.getPath().endsWith(SUFFIX);
}
private static Collection getResources(ClassLoader loader, String resourceName) {
LinkedHashSet resources = new LinkedHashSet();
if (!resourceName.endsWith(SUFFIX)) {
resourceName += SUFFIX;
}
// attempt to load from the context classpath
if (loader == null) {
loader = Thread.currentThread().getContextClassLoader();
}
if (loader != null) {
try {
resources.addAll(Collections.list(loader.getResources(resourceName)));
} catch (IOException e) {
LOG.debug("Failed to load resources for {}", resourceName, e);
}
}
try {
resources.addAll(Collections.list(ClassLoader.getSystemResources(resourceName)));
} catch (IOException e) {
LOG.debug("Failed to load resources for {}", resourceName, e);
}
try {
resourceName = URLDecoder.decode(resourceName, "UTF-8");
File file = new File(resourceName);
if (file.exists()) {
resources.add(file.toURI().toURL());
}
} catch (Exception e) {
LOG.debug("Failed to load resources for {}", resourceName, e);
}
return resources;
}
}
