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/**
* ============LICENSE_START====================================================
* org.onap.ccsdk
* ===========================================================================
* Copyright (c) 2023 AT&T Intellectual Property. All rights reserved.
* ===========================================================================
* 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====================================================
*/
package org.onap.ccsdk.apps.cadi.util;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.List;
import org.onap.ccsdk.apps.cadi.Access;
import org.onap.ccsdk.apps.cadi.Access.Level;
import org.onap.ccsdk.apps.cadi.CadiException;
/**
* Read CSV file for various purposes
*
* @author Instrumental(Jonathan)
*
*/
public class CSV {
private File csv;
private Access access;
private boolean processAll;
private char delimiter = ',';
private boolean go;
public CSV(Access access, File file) {
this.access = access;
csv = file;
processAll = false;
go = true;
}
public CSV(Access access, String csvFilename) {
this.access = access;
csv = new File(csvFilename);
processAll = false;
go = true;
}
public CSV setDelimiter(char delimiter) {
this.delimiter = delimiter;
return this;
}
public String name() {
return csv.getName();
}
public CSV processAll() {
processAll = true;
return this;
}
/*
* Create your code to accept the List<String> row.
*
* Your code may keep the List... CSV does not hold onto it.
*
* @author Instrumental(Jonathan)
*
*/
public interface Visitor {
void visit(List<String> row) throws IOException, CadiException;
}
public void visit(Visitor visitor) throws IOException, CadiException {
BufferedReader br = new BufferedReader(new FileReader(csv));
try {
String line;
StringBuilder sb = new StringBuilder();
while(go && (line = br.readLine())!=null) {
line=line.trim();
if(!line.startsWith("#") && line.length()>0) {
// System.out.println(line); uncomment to debug
List<String> row = new ArrayList<>();
boolean quotes=false;
boolean escape=false;
char c = 0;
for(int i=0;i<line.length();++i) {
switch(c=line.charAt(i)) {
case '"':
if(quotes) {
if(i<line.length()-1) { // may look ahead
if('"' == line.charAt(i+1)) {
sb.append(c);
++i;
} else {
quotes = false;
}
} else {
quotes=false;
}
} else {
quotes=true;
}
break;
case '\\':
if(escape) {
sb.append(c);
escape = false;
} else {
escape = true;
}
break;
case 'n':
if(escape) {
sb.append("\\n");
escape=false;
} else {
sb.append(c);
}
break;
default:
if(delimiter==c) {
if(quotes) {
sb.append(c);
} else {
row.add(sb.toString());
sb.setLength(0);
}
} else {
sb.append(c);
}
}
}
if(sb.length()>0 || c==',') {
row.add(sb.toString());
sb.setLength(0);
}
try {
visitor.visit(row);
} catch (CadiException e) {
if(processAll) {
access.log(Level.ERROR,e);
} else {
throw e;
}
}
}
}
} finally {
br.close();
}
}
public Writer writer() throws FileNotFoundException {
return new Writer(false);
}
public Writer writer(boolean append) throws FileNotFoundException {
return new Writer(append);
}
public interface RowSetter {
public void row(Object ... objs);
}
public static class Saver implements RowSetter {
List<String> ls= new ArrayList<>();
@Override
public void row(Object ... objs) {
if(objs.length>0) {
for(Object o : objs) {
if(o != null) {
if(o instanceof String[]) {
for(String str : (String[])o) {
ls.add(str);
}
} else {
ls.add(o.toString());
}
}
}
}
}
public List<String> asList() {
List<String> rv = ls;
ls = new ArrayList<>();
return rv;
}
}
public class Writer implements RowSetter {
private PrintStream ps;
private Writer(final boolean append) throws FileNotFoundException {
ps = new PrintStream(new FileOutputStream(csv,append));
}
@Override
public void row(Object ... objs) {
if(objs.length>0) {
boolean first = true;
for(Object o : objs) {
if(first) {
first = false;
} else {
ps.append(delimiter);
}
if(o == null) {
} else if(o instanceof String[]) {
for(String str : (String[])o) {
print(str);
}
} else {
print(o.toString());
}
}
ps.println();
}
}
private void print(String s) {
boolean quote = s.matches(".*[,|\"].*");
if(quote) {
ps.append('"');
ps.print(s.replace("\"", "\"\"")
.replace("'", "''")
.replace("\\", "\\\\"));
ps.append('"');
} else {
ps.append(s);
}
}
/**
* Note: CSV files do not actually support Comments as a standard, but it is useful
* @param comment
*/
public void comment(String comment, Object ... objs) {
ps.print("# ");
ps.printf(comment,objs);
ps.println();
}
public void flush() {
ps.flush();
}
public void close() {
flush();
ps.close();
}
public String toString() {
return csv.getAbsolutePath();
}
}
/**
* Provides a way to stop processing records from inside a Visit
*/
public void stop() {
go = false;
}
public void delete() {
csv.delete();
}
public String toString() {
return csv.getAbsolutePath();
}
}
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