Files.java

package tests.helper;

import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * Class with helper methods to read file content from your classpath.
 * It is especially useful when need to compare big string output with
 * a file that contains the expected response.
 */
public class Files {

	/**
	 * Read a file placed in same package you call this method.
	 */
	static String readInSamePackage( final String fileName ) {
		final StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
		final StackTraceElement calleeElement = stackTrace[1];
		final String packageName = calleeElement.getClassName().replaceAll( "\\.[^\\.]+$", "" );
		final String directory = packageName.replace( '.', File.separatorChar );
		return read( directory + File.separatorChar + fileName );
	}

	/**
	 * Read a file.
	 */
	static String read( final String fileName ) {
		try {
			final InputStreamReader reader = openFileAsStream( fileName );
			final StringBuilder string = new StringBuilder();
			final char[] buffer = new char[1024];
			int readbytes = 0;
			while ( ( readbytes = reader.read( buffer ) ) >= 0 )
				string.append( buffer, 0, readbytes );
			return string.toString();
		} catch ( final IOException e ) {
			throw new RuntimeException( e );
		}
	}

	private static InputStreamReader openFileAsStream( final String fileName ) {
		final ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
		return new InputStreamReader( classLoader.getResourceAsStream( fileName ) );
	}
}