org.apache.pulsar.shell.config.FileConfigStore Maven / Gradle / Ivy
/*
* 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.pulsar.shell.config;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.exc.MismatchedInputException;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* File based configurations store.
*
* All the configurations are stored in a single file in JSON format.
*/
public class FileConfigStore implements ConfigStore {
@Data
@NoArgsConstructor
public static class FileConfig {
private LinkedHashMap configs = new LinkedHashMap<>();
private String last;
}
private final ObjectMapper mapper = new ObjectMapper();
private final File file;
private final ConfigEntry defaultConfig;
private FileConfig fileConfig;
public FileConfigStore(File file, ConfigEntry defaultConfig) throws IOException {
this.file = file;
if (file.exists()) {
read();
} else {
fileConfig = new FileConfig();
}
if (defaultConfig != null) {
this.defaultConfig = new ConfigEntry(defaultConfig.getName(), defaultConfig.getValue());
ConfigStore.cleanupValue(this.defaultConfig);
} else {
this.defaultConfig = null;
}
}
private void read() throws IOException {
try (final BufferedInputStream buffered = new BufferedInputStream(new FileInputStream(file));) {
try {
fileConfig = mapper.readValue(buffered, FileConfig.class);
} catch (MismatchedInputException mismatchedInputException) {
fileConfig = new FileConfig();
}
}
}
private void write() throws IOException {
try (final BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(file));) {
mapper.writeValue(bufferedOutputStream, fileConfig);
}
}
@Override
public void putConfig(ConfigEntry entry) throws IOException {
if (DEFAULT_CONFIG.equals(entry.getName())) {
throw new IllegalArgumentException("'" + DEFAULT_CONFIG + "' can't be modified.");
}
ConfigStore.cleanupValue(entry);
fileConfig.configs.put(entry.getName(), entry);
write();
}
@Override
public ConfigEntry getConfig(String name) {
if (DEFAULT_CONFIG.equals(name)) {
return defaultConfig;
}
return fileConfig.configs.get(name);
}
@Override
public void deleteConfig(String name) throws IOException{
if (DEFAULT_CONFIG.equals(name)) {
throw new IllegalArgumentException("'" + DEFAULT_CONFIG + "' can't be deleted.");
}
final ConfigEntry old = fileConfig.configs.remove(name);
if (old != null) {
write();
}
}
@Override
public List listConfigs() {
List all = new ArrayList<>(fileConfig.configs.values());
if (defaultConfig != null) {
all.add(0, defaultConfig);
}
return all;
}
@Override
public void setLastUsed(String name) throws IOException {
fileConfig.last = name;
write();
}
@Override
public ConfigEntry getLastUsed() throws IOException {
if (fileConfig.last != null) {
return getConfig(fileConfig.last);
}
return null;
}
}