import org.gradle.api.resources.ResourceException;

import java.net.URI;

/**
 * Exception thrown when one attempts to read a folder
 */
public class ResourceIsAFolderException extends ResourceException {
    public ResourceIsAFolderException(URI location, String message) {
        super(location, message);
    }

import java.io.File;
import java.io.FileNotFoundException;
import java.net.URI;

public class ResourceExceptions {
    public static ResourceIsAFolderException readFolder(File location) {
        return new ResourceIsAFolderException(location.toURI(), String.format("Cannot read '%s' because it is a folder.", location));
    }

    public static ResourceException readFailed(File location, Throwable failure) {

        when:
        resource.text

        then:
        def e = thrown(ResourceIsAFolderException)
        e.message == "Could not read <display-name> '$dir' as it is a directory." as String

        when:
        resource.asReader

        then:
        e = thrown(ResourceIsAFolderException)
        e.message == "Could not read <display-name> '$dir' as it is a directory." as String

        }
    }

    private void assertNoDirectory() {
        if (sourceFile != null && sourceFile.isDirectory()) {
            throw new ResourceIsAFolderException(sourceUri, String.format("Could not read %s as it is a directory.", getDisplayName()));
        }
    }

    @Override
    public boolean getExists() {
        File file = getFile();

Class <org.gradle.internal.resource.ResourceIsAFolderException> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (ResourceIsAFolderException.java:0)
Class <org.gradle.internal.resource.ResourceLocation> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (ResourceLocation.java:0)