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Tests infrastructure library for creating mule automated test cases.

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/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */

package org.mule.test.infrastructure;

import static java.nio.charset.Charset.defaultCharset;
import static org.junit.Assert.fail;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;

import org.hamcrest.Description;
import org.hamcrest.Factory;
import org.hamcrest.Matcher;
import org.junit.internal.matchers.TypeSafeMatcher;


public class FileContainsInLine extends TypeSafeMatcher
{
    private final Matcher stringMatcher;

    @Factory
    public static Matcher hasLine(Matcher matcher)
    {
        return new FileContainsInLine(matcher);
    }

    private FileContainsInLine(Matcher matcher)
    {
        stringMatcher = matcher;
    }


    @Override
    public void describeTo(Description description)
    {
       description.appendText("a file where a line ").appendDescriptionOf(stringMatcher);
    }

    @Override
    public boolean matchesSafely(File file)
    {
        String line;
        try(BufferedReader reader = Files.newBufferedReader(file.toPath(), defaultCharset()))
        {

            while ((line = reader.readLine()) != null)
            {
                if (stringMatcher.matches(line))
                {
                    return true;
                }
            }
        }
        catch (IOException e)
        {
            fail(String.format("Exception %s caught while reading the file %s trying to match its line with the matcher %s",e.getMessage(),file.getAbsolutePath(),stringMatcher.toString()));
            return false;
        }
        return false;
    }
}