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/*
* 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.tuscany.nosqldatastore.hbase;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.client.*;
import org.apache.tuscany.nosqldatastore.Group;
import org.apache.tuscany.nosqldatastore.exception.DuplicateEntryException;
import org.apache.tuscany.nosqldatastore.exception.EntryNotFoundException;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
public class HBaseGroup implements Group {
private HTable table;
private String cf;
HBaseGroup(HTable table, String cf){
this.table = table;
this.cf = cf;
}
public void addEntry(String key, String value) throws DuplicateEntryException {
if(get(key) == null){
Put put = new Put(key.getBytes());
put.add(cf.getBytes(),key.getBytes(),value.getBytes());
try {
table.put(put);
table.flushCommits();
} catch (IOException e) {
System.out.println("Error: Adding the entry for the Key "+key);
e.printStackTrace();
}
} else {
throw new DuplicateEntryException("Duplicate entry for key "+key);
}
}
public void updateEntry(String key, String value) throws EntryNotFoundException {
if(get(key) != null){
Put put = new Put(key.getBytes());
put.add(cf.getBytes(),key.getBytes(),value.getBytes());
try {
table.put(put);
table.flushCommits();
} catch (IOException e) {
System.out.println("Error: Adding the entry for the Key "+key);
e.printStackTrace();
}
} else {
throw new EntryNotFoundException("Entry does not exist for key "+key);
}
}
public void deleteEntry(String key) throws EntryNotFoundException {
if(get(key) != null){
Delete delete = new Delete(key.getBytes());
delete.deleteColumn(cf.getBytes(), key.getBytes());
try {
table.delete(delete);
table.flushCommits();
} catch (IOException e) {
System.out.println("Error: Deleting the entry for the Key "+key);
e.printStackTrace();
}
} else {
throw new EntryNotFoundException("Entry does not exist for key "+key);
}
}
public String getEntry(String key) throws EntryNotFoundException {
byte[] b;
if((b = get(key)) != null){
return new String(b);
} else {
throw new EntryNotFoundException("Entry does not exist for key "+key);
}
}
private byte[] get(String key){
Result result = null;
Get get = new Get(key.getBytes());
try {
result = table.get(get);
} catch (IOException e) {
System.out.println("Error: Getting the entry for the Key "+key);
e.printStackTrace();
}
return result.getValue(cf.getBytes(),key.getBytes());
}
}
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