Java Path File Content assertSameContent(String expectedFilePath, String actualFilePath)

Description

assert Same Content

License

Apache License

Declaration

public static void assertSameContent(String expectedFilePath, String actualFilePath) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.file.Files;

public class Main {
    public static void assertSameContent(String expectedFilePath, String actualFilePath) {
        assertSameContent(new File(expectedFilePath), new File(actualFilePath));
    }/*from   w ww .  j  ava 2 s .  c  om*/

    public static void assertSameContent(File expectedFile, File actualFile) {
        if (expectedFile == null) {
            throw new IllegalArgumentException("expected file cannot be null");
        }
        if (actualFile == null) {
            throw new AssertionError("actual file was null");
        }
        if (!actualFile.exists()) {
            throw new AssertionError("actual file[" + actualFile.getAbsolutePath() + "] does not exist");
        }
        if (!expectedFile.exists()) {
            try {
                Files.move(actualFile.getAbsoluteFile().toPath(), expectedFile.getAbsoluteFile().toPath());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            System.err.println("Expected File [" + expectedFile.getAbsolutePath()
                    + "] does not exist. Renaming actual file to expected file. Review Content");
            return;
        }
        if (expectedFile.length() != actualFile.length()) {
            throw new AssertionError("expected file size[" + expectedFile.getAbsolutePath() + ":"
                    + expectedFile.length() + "] is different from actual file size[" + actualFile.getAbsolutePath()
                    + ":" + actualFile.length() + "]");
        }
        String expectedString = loadFile(expectedFile);
        String actualString = loadFile(actualFile);
        if (!expectedString.equals(actualString)) {
            throw new AssertionError("Content of expected file [" + expectedFile.getAbsolutePath()
                    + "] is different from content of actual file [" + actualFile.getAbsolutePath() + "]");
        }
    }

    public static String loadFile(File file) {
        try {
            try (Reader reader = new InputStreamReader(new FileInputStream(file), "UTF-8")) {
                StringBuilder builder = new StringBuilder(1024);
                char[] buffer = new char[1024];
                int length;
                while ((length = reader.read(buffer)) != -1) {
                    builder.append(buffer, 0, length);
                }
                return builder.toString();
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

Related

1. appendToLog(String content, Path newFile)
2. contentEquals(Path leftPath, Path rightPath)
3. fileContent(final Path p)
4. fileContent(final String filePath)
5. getContent(Path path)