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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.authz.local;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileChannel.MapMode;
public class DataFile {
private RandomAccessFile rafile;
private FileChannel channel;
public MappedByteBuffer mapBuff;
private final File file;
private final String access;
public DataFile(File file, String access) {
this.file = file;
this.access = access;
}
public void open() throws IOException {
if(!file.exists()) throw new FileNotFoundException();
rafile = new RandomAccessFile(file,access);
channel = rafile.getChannel();
mapBuff = channel.map("r".equals(access)?MapMode.READ_ONLY:MapMode.READ_WRITE,0,channel.size());
}
public void close() throws IOException {
if(channel!=null){channel.close();}
if(rafile!=null) {rafile.close();}
mapBuff = null;
}
public long size() throws IOException {
return channel.size();
}
private synchronized int load(Token t) {
int len = Math.min(mapBuff.limit()-t.next,t.buff.length);
if(len>0) {
mapBuff.position(t.next);
mapBuff.get(t.buff,0,len);
}
return len<0?0:len;
}
public class Token {
private byte[] buff;
int pos, next, end;
public Token(int size) {
buff = new byte[size];
pos = next = end = 0;
}
public boolean pos(int to) {
pos = next = to;
return (end=load(this))>0;
}
public boolean nextLine() {
end = load(this);
pos = next;
for(int i=0;i<end;++i) {
if(buff[i]=='\n') {
end = i;
next += i+1;
return true;
}
}
return false;
}
public IntBuffer getIntBuffer() {
return ByteBuffer.wrap(buff).asIntBuffer();
}
public String toString() {
return new String(buff,0,end);
}
public class Field {
char delim;
int idx;
ByteBuffer bb;
public Field(char delimiter) {
delim = delimiter;
idx = 0;
bb = null;
}
public Field reset() {
idx = 0;
return this;
}
public String next() {
if(idx>=end)return null;
int start = idx;
byte c=0;
int endStr = -1;
while(idx<end && idx<buff.length && (c=buff[idx])!=delim && c!='\n') { // for DOS
if(c=='\r')endStr=idx;
++idx;
}
if(endStr<0) {
endStr=idx-start;
} else {
endStr=endStr-start;
}
++idx;
return new String(buff,start,endStr);
}
public String at(int fieldOffset) {
int start;
byte c=0;
for(int count = idx = start = 0; idx<end && idx<buff.length; ++idx) {
if((c=buff[idx])==delim || c=='\n') {
if(count++ == fieldOffset) {
break;
}
start = idx+1;
}
}
return new String(buff,start,(idx-start-(c=='\r'?1:0)));
}
public String atToEnd(int fieldOffset) {
int start;
byte c=0;
for(int count = idx = start = 0; idx<end && idx<buff.length; ++idx) {
if((c=buff[idx])==delim || c=='\n') {
if(count++ == fieldOffset) {
break;
}
start = idx+1;
}
}
for(; idx<end && idx<buff.length && (c=buff[idx])!='\n'; ++idx) {
++idx;
}
return new String(buff,start,(idx-start-((c=='\r' || idx>=end)?1:0)));
}
}
public int pos() {
return pos;
}
}
public File file() {
return file;
}
}
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