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/*******************************************************************************
* ============LICENSE_START====================================================
* * org.onap.aai
* * ===========================================================================
* * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* * Copyright © 2017 Amdocs
* * ===========================================================================
* * 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.
* * ============LICENSE_END====================================================
* *
* * ECOMP is a trademark and service mark of AT&T Intellectual Property.
* *
******************************************************************************/
package com.att.dao;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import com.datastax.driver.core.Row;
public abstract class Loader<DATA> {
private int keylimit;
public Loader(int keylimit) {
this.keylimit = keylimit;
}
public int keylimit() {
return keylimit;
}
protected abstract DATA load(DATA data, Row row);
protected abstract void key(DATA data, int idx, Object[] obj);
protected abstract void body(DATA data, int idx, Object[] obj);
public final Object[] extract(DATA data, int size, CassDAOImpl.CRUD type) {
Object[] rv=null;
switch(type) {
case delete:
rv = new Object[keylimit()];
key(data,0,rv);
break;
case update:
rv = new Object[size];
body(data,0,rv);
int body = size-keylimit();
if(body>0) {
key(data,body,rv);
}
break;
default:
rv = new Object[size];
key(data,0,rv);
if(size>keylimit()) {
body(data,keylimit(),rv);
}
break;
}
return rv;
}
public static void writeString(DataOutputStream os, String s) throws IOException {
if(s==null) {
os.writeInt(-1);
} else {
switch(s.length()) {
case 0:
os.writeInt(0);
break;
default:
byte[] bytes = s.getBytes();
os.writeInt(bytes.length);
os.write(bytes);
}
}
}
/**
* We use bytes here to set a Maximum
*
* @param is
* @param MAX
* @return
* @throws IOException
*/
public static String readString(DataInputStream is, byte[] _buff) throws IOException {
int l = is.readInt();
byte[] buff = _buff;
switch(l) {
case -1: return null;
case 0: return "";
default:
// Cover case where there is a large string, without always allocating a large buffer.
if(l>buff.length) {
buff = new byte[l];
}
is.read(buff,0,l);
return new String(buff,0,l);
}
}
/**
* Write a set with proper sizing
*
* Note: at the moment, this is just String. Probably can develop system where types
* are supported too... but not now.
*
* @param os
* @param set
* @throws IOException
*/
public static void writeStringSet(DataOutputStream os, Collection<String> set) throws IOException {
if(set==null) {
os.writeInt(-1);
} else {
os.writeInt(set.size());
for(String s : set) {
writeString(os, s);
}
}
}
public static Set<String> readStringSet(DataInputStream is, byte[] buff) throws IOException {
int l = is.readInt();
if(l<0) {
return null;
}
Set<String> set = new HashSet<String>(l);
for(int i=0;i<l;++i) {
set.add(readString(is,buff));
}
return set;
}
public static List<String> readStringList(DataInputStream is, byte[] buff) throws IOException {
int l = is.readInt();
if(l<0) {
return null;
}
List<String> list = new ArrayList<String>(l);
for(int i=0;i<l;++i) {
list.add(Loader.readString(is,buff));
}
return list;
}
/**
* Write a map
* @param os
* @param map
* @throws IOException
*/
public static void writeStringMap(DataOutputStream os, Map<String,String> map) throws IOException {
if(map==null) {
os.writeInt(-1);
} else {
Set<Entry<String, String>> es = map.entrySet();
os.writeInt(es.size());
for(Entry<String,String> e : es) {
writeString(os, e.getKey());
writeString(os, e.getValue());
}
}
}
public static Map<String,String> readStringMap(DataInputStream is, byte[] buff) throws IOException {
int l = is.readInt();
if(l<0) {
return null;
}
Map<String,String> map = new HashMap<String,String>(l);
for(int i=0;i<l;++i) {
String key = readString(is,buff);
map.put(key,readString(is,buff));
}
return map;
}
public static void writeHeader(DataOutputStream os, int magic, int version) throws IOException {
os.writeInt(magic);
os.writeInt(version);
}
public static int readHeader(DataInputStream is, final int magic, final int version) throws IOException {
if(is.readInt()!=magic) {
throw new IOException("Corrupted Data Stream");
}
int v = is.readInt();
if(version<0 || v>version) {
throw new IOException("Unsupported Data Version: " + v);
}
return v;
}
}
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