// The MIT License (MIT)

//

// Copyright (c) 2016 Robert C. Seacord

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in all

// copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

// SOFTWARE.

package IDS08J;

import java.io.FileInputStream;

import java.io.IOException;

import java.nio.CharBuffer;

import java.nio.MappedByteBuffer;

import java.nio.channels.FileChannel;

import java.nio.charset.Charset;

import java.nio.charset.CharsetDecoder;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

class LogSearch {

private static void FindLogEntryBad(String search) {

// Construct regex dynamically from user string

String regex = "(.*? +public\\[\\d+\\] +.*" + search + ".*)";

Pattern searchPattern = Pattern.compile(regex);

try (FileInputStream fis = new FileInputStream("src/IDS08J/log.txt"); FileChannel channel = fis.getChannel()) {

// Get the file's size and map it into memory

long size = channel.size();

final MappedByteBuffer mappedBuffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, size);

Charset charset = Charset.forName("ISO-8859-15");

final CharsetDecoder decoder = charset.newDecoder();

// Read file into char buffer

CharBuffer log = decoder.decode(mappedBuffer);

Matcher logMatcher = searchPattern.matcher(log);

while (logMatcher.find()) {

String match = logMatcher.group();

if (!match.isEmpty()) {

System.out.println(match);

}

}

} catch (IOException ex) {

System.err.println("thrown exception: " + ex.toString());

Throwable[] suppressed = ex.getSuppressed();

for (Throwable aSuppressed : suppressed) {

System.err.println("suppressed exception: " + aSuppressed.toString());

}

}

}

private static void FindLogEntryQuote(String search) {

// Construct regex dynamically from user string

String regex = "(.*? +public\\[\\d+\\] +.*" + Pattern.quote(search) + ".*)";

Pattern searchPattern = Pattern.compile(regex);

try (FileInputStream fis = new FileInputStream("src/IDS08J/log.txt"); FileChannel channel = fis.getChannel()) {

// Get the file's size and map it into memory

long size = channel.size();

final MappedByteBuffer mappedBuffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, size);

Charset charset = Charset.forName("ISO-8859-15");

final CharsetDecoder decoder = charset.newDecoder();

// Read file into char buffer

CharBuffer log = decoder.decode(mappedBuffer);

Matcher logMatcher = searchPattern.matcher(log);

while (logMatcher.find()) {

String match = logMatcher.group();

if (!match.isEmpty()) {

System.out.println(match);

}

}

} catch (IOException ex) {

System.err.println("thrown exception: " + ex.toString());

Throwable[] suppressed = ex.getSuppressed();

for (Throwable aSuppressed : suppressed) {

System.err.println("suppressed exception: " + aSuppressed.toString());

}

}

}

public static void main(String[] args) {

String arg = ".*)|(.*";

System.out.println("FindLogEntryBad(arg)");

FindLogEntryBad(arg); // matches everything

System.out.println("++++++++++++++++++++++");

System.out.println("FindLogEntryQuote(arg)");

FindLogEntryQuote(arg); // matches nothing

System.out.println("++++++++++++++++++++++");

System.out.println("FindLogEntryQuote(\"\")");

FindLogEntryQuote(""); // matches lines containing "public"

System.out.println("++++++++++++++++++++++");

}

}