Embed Directive in CLIPS

Here’s the translation of the Go code example to Java, along with explanations in Markdown format suitable for Hugo:

The embed directive is not a standard feature in Java. However, we can achieve similar functionality using classpath resources and the getResourceAsStream method. This approach allows us to include files in the Java JAR at build time.

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;

public class EmbedExample {

    // We can't directly embed files in Java, but we can load them as resources
    private static final String fileString;
    private static final byte[] fileByte;

    static {
        try {
            fileString = new String(
                EmbedExample.class.getResourceAsStream("/folder/single_file.txt").readAllBytes(),
                StandardCharsets.UTF_8
            );
            fileByte = EmbedExample.class.getResourceAsStream("/folder/single_file.txt").readAllBytes();
        } catch (IOException e) {
            throw new RuntimeException("Failed to load embedded resources", e);
        }
    }

    public static void main(String[] args) throws IOException {
        // Print out the contents of 'single_file.txt'
        System.out.print(fileString);
        System.out.print(new String(fileByte, StandardCharsets.UTF_8));

        // Retrieve some files from the embedded folder
        try (InputStream is1 = EmbedExample.class.getResourceAsStream("/folder/file1.hash")) {
            System.out.print(new String(is1.readAllBytes(), StandardCharsets.UTF_8));
        }

        try (InputStream is2 = EmbedExample.class.getResourceAsStream("/folder/file2.hash")) {
            System.out.print(new String(is2.readAllBytes(), StandardCharsets.UTF_8));
        }
    }
}

To use this example:

Create a src directory for your Java source files.
Create a resources directory parallel to src for your resource files.
Place the Java file in the src directory.
Create a folder directory inside the resources directory.
Place single_file.txt, file1.hash, and file2.hash in the resources/folder directory.

Here’s how you would compile and run the program:

$ javac -d . src/EmbedExample.java
$ java -cp .:resources EmbedExample

This will output:

hello java
hello java
123
456

In this Java version:

We use getResourceAsStream to load files from the classpath, which is similar to embedding files in the binary.
The static initializer block is used to load the contents of single_file.txt into both a String and a byte[] when the class is loaded.
We use try-with-resources to ensure that input streams are properly closed after reading.
The readAllBytes() method is used to read the entire contents of a file into a byte array.

Remember to include your resource files in the correct location in your project structure and ensure they are included when building your JAR file if you’re creating one.

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Embed Directive in CLIPS