| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.slider.core.registry.docstore; |
| |
| import com.google.common.base.Charsets; |
| import com.google.common.base.Preconditions; |
| import org.apache.commons.io.FileUtils; |
| import org.apache.commons.io.IOUtils; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.slider.common.tools.ConfigHelper; |
| |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.io.StringWriter; |
| import java.util.Properties; |
| |
| /** |
| * Output a published configuration |
| */ |
| public abstract class PublishedConfigurationOutputter { |
| |
| protected final PublishedConfiguration owner; |
| |
| protected PublishedConfigurationOutputter(PublishedConfiguration owner) { |
| this.owner = owner; |
| } |
| |
| /** |
| * Save the config to a destination file, in the format of this outputter |
| * @param dest destination file |
| * @throws IOException |
| */ |
| /* JDK7 |
| public void save(File dest) throws IOException { |
| try(FileOutputStream out = new FileOutputStream(dest)) { |
| save(out); |
| out.close(); |
| } |
| } |
| */ |
| public void save(File dest) throws IOException { |
| FileOutputStream out = null; |
| try { |
| out = new FileOutputStream(dest); |
| save(out); |
| out.close(); |
| } finally { |
| org.apache.hadoop.io.IOUtils.closeStream(out); |
| } |
| } |
| |
| /** |
| * Save the content. The default saves the asString() value |
| * to the output stream |
| * @param out output stream |
| * @throws IOException |
| */ |
| public void save(OutputStream out) throws IOException { |
| IOUtils.write(asString(), out, Charsets.UTF_8); |
| } |
| /** |
| * Convert to a string |
| * @return the string form |
| * @throws IOException |
| */ |
| public abstract String asString() throws IOException; |
| |
| /** |
| * Create an outputter for the chosen format |
| * @param format format enumeration |
| * @param owner owning config |
| * @return the outputter |
| */ |
| |
| public static PublishedConfigurationOutputter createOutputter(ConfigFormat format, |
| PublishedConfiguration owner) { |
| Preconditions.checkNotNull(owner); |
| switch (format) { |
| case XML: |
| return new XmlOutputter(owner); |
| case PROPERTIES: |
| return new PropertiesOutputter(owner); |
| case JSON: |
| return new JsonOutputter(owner); |
| case ENV: |
| return new EnvOutputter(owner); |
| default: |
| throw new RuntimeException("Unsupported format :" + format); |
| } |
| } |
| |
| public static class XmlOutputter extends PublishedConfigurationOutputter { |
| |
| |
| private final Configuration configuration; |
| |
| public XmlOutputter(PublishedConfiguration owner) { |
| super(owner); |
| configuration = owner.asConfiguration(); |
| } |
| |
| @Override |
| public void save(OutputStream out) throws IOException { |
| configuration.writeXml(out); |
| } |
| |
| @Override |
| public String asString() throws IOException { |
| return ConfigHelper.toXml(configuration); |
| } |
| |
| public Configuration getConfiguration() { |
| return configuration; |
| } |
| } |
| |
| public static class PropertiesOutputter extends PublishedConfigurationOutputter { |
| |
| private final Properties properties; |
| |
| public PropertiesOutputter(PublishedConfiguration owner) { |
| super(owner); |
| properties = owner.asProperties(); |
| } |
| |
| @Override |
| public void save(OutputStream out) throws IOException { |
| properties.store(out, ""); |
| } |
| |
| |
| public String asString() throws IOException { |
| StringWriter sw = new StringWriter(); |
| properties.store(sw, ""); |
| return sw.toString(); |
| } |
| } |
| |
| |
| public static class JsonOutputter extends PublishedConfigurationOutputter { |
| |
| public JsonOutputter(PublishedConfiguration owner) { |
| super(owner); |
| } |
| |
| @Override |
| public void save(File dest) throws IOException { |
| FileUtils.writeStringToFile(dest, asString(), Charsets.UTF_8); |
| } |
| |
| @Override |
| public String asString() throws IOException { |
| return owner.asJson(); |
| } |
| } |
| |
| |
| public static class EnvOutputter extends PublishedConfigurationOutputter { |
| |
| public EnvOutputter(PublishedConfiguration owner) { |
| super(owner); |
| } |
| |
| @Override |
| public void save(File dest) throws IOException { |
| FileUtils.writeStringToFile(dest, asString(), Charsets.UTF_8); |
| } |
| |
| @Override |
| public String asString() throws IOException { |
| if (!owner.entries.containsKey("content")) { |
| throw new IOException("Configuration has no content field and cannot " + |
| "be retrieved as type 'env'"); |
| } |
| return owner.entries.get("content"); |
| } |
| } |
| |
| |
| } |