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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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 org.elasticsearch.common.settings.loader;
import org.elasticsearch.common.xcontent.XContentType;
/**
* A class holding factory methods for settings loaders that attempts
* to infer the type of the underlying settings content.
*/
public final class SettingsLoaderFactory {
private SettingsLoaderFactory() {
}
/**
* Returns a {@link SettingsLoader} based on the source resource
* name. This factory method assumes that if the resource name ends
* with ".json" then the content should be parsed as JSON, else if
* the resource name ends with ".yml" or ".yaml" then the content
* should be parsed as YAML, otherwise throws an exception. Note that the
* parsers returned by this method will not accept null-valued
* keys.
*
* @param resourceName The resource name containing the settings
* content.
* @return A settings loader.
*/
public static SettingsLoader loaderFromResource(String resourceName) {
if (resourceName.endsWith(".json")) {
return new JsonSettingsLoader(false);
} else if (resourceName.endsWith(".yml") || resourceName.endsWith(".yaml")) {
return new YamlSettingsLoader(false);
} else {
throw new IllegalArgumentException("unable to detect content type from resource name [" + resourceName + "]");
}
}
/**
* Returns a {@link SettingsLoader} based on the source content.
* This factory method assumes that if the underlying content
* contains an opening and closing brace ('{' and '}') then the
* content should be parsed as JSON, else if the underlying content
* fails this condition but contains a ':' then the content should
* be parsed as YAML, and otherwise throws an exception.
* Note that the JSON and YAML parsers returned by this method will
* accept null-valued keys.
*
* @param source The underlying settings content.
* @return A settings loader.
* @deprecated use {@link #loaderFromXContentType(XContentType)} instead
*/
@Deprecated
public static SettingsLoader loaderFromSource(String source) {
if (source.indexOf('{') != -1 && source.indexOf('}') != -1) {
return new JsonSettingsLoader(true);
} else if (source.indexOf(':') != -1) {
return new YamlSettingsLoader(true);
} else {
throw new IllegalArgumentException("unable to detect content type from source [" + source + "]");
}
}
/**
* Returns a {@link SettingsLoader} based on the {@link XContentType}. Note only {@link XContentType#JSON} and
* {@link XContentType#YAML} are supported
*
* @param xContentType The content type
* @return A settings loader.
*/
public static SettingsLoader loaderFromXContentType(XContentType xContentType) {
if (xContentType == XContentType.JSON) {
return new JsonSettingsLoader(true);
} else if (xContentType == XContentType.YAML) {
return new YamlSettingsLoader(true);
} else {
throw new IllegalArgumentException("unsupported content type [" + xContentType + "]");
}
}
}
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