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/*
* Copyright 2015 Open Networking Laboratory
*
* 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 org.onosproject.store.consistent.impl;
import static com.google.common.base.Preconditions.checkNotNull;
import java.io.File;
import java.io.IOException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.io.Files;
/**
* Allows for reading and writing partitioned database definition as a JSON file.
*/
public class DatabaseDefinitionStore {
private final File file;
/**
* Creates a reader/writer of the database definition file.
*
* @param filePath location of the definition file
*/
public DatabaseDefinitionStore(String filePath) {
file = new File(checkNotNull(filePath));
}
/**
* Creates a reader/writer of the database definition file.
*
* @param filePath location of the definition file
*/
public DatabaseDefinitionStore(File filePath) {
file = checkNotNull(filePath);
}
/**
* Returns the database definition.
*
* @return database definition
* @throws IOException when I/O exception of some sort has occurred.
*/
public DatabaseDefinition read() throws IOException {
ObjectMapper mapper = new ObjectMapper();
return mapper.readValue(file, DatabaseDefinition.class);
}
/**
* Writes the specified database definition to file.
*
* @param definition database definition
* @throws IOException when I/O exception of some sort has occurred.
*/
public void write(DatabaseDefinition definition) throws IOException {
checkNotNull(definition);
// write back to file
Files.createParentDirs(file);
ObjectMapper mapper = new ObjectMapper();
mapper.writeValue(file, definition);
}
}
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