Embed Directive in Squirrel

Here’s the translation of the Go embed directive example to Java, formatted in Markdown suitable for Hugo:

Java does not have a direct equivalent to Go’s embed directive, but we can achieve similar functionality using Java’s classpath resources. Here’s how we can implement a similar concept in Java:

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

public class EmbedExample {
    // We can't embed files at compile time in Java, but we can load them as resources
    private static final String fileString = loadResourceAsString("folder/single_file.txt");
    private static final byte[] fileByte = loadResourceAsByteArray("folder/single_file.txt");

    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 resources folder
        String content1 = loadResourceAsString("folder/file1.hash");
        System.out.print(content1);

        String content2 = loadResourceAsString("folder/file2.hash");
        System.out.print(content2);
    }

    private static String loadResourceAsString(String resourcePath) {
        try (InputStream inputStream = EmbedExample.class.getClassLoader().getResourceAsStream(resourcePath)) {
            if (inputStream == null) return null;
            return new String(inputStream.readAllBytes(), StandardCharsets.UTF_8);
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

    private static byte[] loadResourceAsByteArray(String resourcePath) {
        try (InputStream inputStream = EmbedExample.class.getClassLoader().getResourceAsStream(resourcePath)) {
            if (inputStream == null) return null;
            return inputStream.readAllBytes();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }
}

In this Java example, we’re using the classpath to load resources. The files need to be placed in the src/main/resources directory of your Java project.

To run this example, you would need to:

Create a folder directory inside src/main/resources.
Create the following files:
- src/main/resources/folder/single_file.txt with content “hello java”
- src/main/resources/folder/file1.hash with content “123”
- src/main/resources/folder/file2.hash with content “456”

Then you can compile and run the program:

$ javac EmbedExample.java
$ java EmbedExample
hello java
hello java
123
456

Note that in Java, we can’t embed files at compile time like in Go. Instead, we load them at runtime from the classpath. This approach allows us to package resources with our application, which can then be accessed when the application is running.

The loadResourceAsString and loadResourceAsByteArray methods provide functionality similar to Go’s embed.FS. They load resources from the classpath, either as a String or as a byte array.

This approach works well for applications packaged as JAR files, as the resources will be included in the JAR and can be accessed at runtime.

Reading Files in Squirrel

Testing And Benchmarking in Squirrel

Learn X By Example

Title here

Embed Directive in Squirrel