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An multi-platform library for OpenGL, OpenGL ES and Vulkan development on the desktop. It provides a simple API for creating windows, contexts and surfaces, receiving input and events.
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/*
 * Copyright LWJGL. All rights reserved.
 * License terms: https://www.lwjgl.org/license
 * MACHINE GENERATED FILE, DO NOT EDIT
 */
package org.lwjgl.glfw;

import javax.annotation.*;

import org.lwjgl.system.*;

import static org.lwjgl.system.MemoryUtil.*;

import java.io.PrintStream;
import java.util.Map;

import static org.lwjgl.glfw.GLFW.*;

/**
 * Instances of this class may be passed to the {@link GLFW#glfwSetErrorCallback SetErrorCallback} method.
 * 
 * Type
 * 
 * 
 * void (*{@link #invoke}) (
 *     int error,
 *     char *description
 * )
 *
 * @since version 3.0
 */
public abstract class GLFWErrorCallback extends Callback implements GLFWErrorCallbackI {

    /**
     * Creates a {@code GLFWErrorCallback} instance from the specified function pointer.
     *
     * @return the new {@code GLFWErrorCallback}
     */
    public static GLFWErrorCallback create(long functionPointer) {
        GLFWErrorCallbackI instance = Callback.get(functionPointer);
        return instance instanceof GLFWErrorCallback
            ? (GLFWErrorCallback)instance
            : new Container(functionPointer, instance);
    }

    /** Like {@link #create(long) create}, but returns {@code null} if {@code functionPointer} is {@code NULL}. */
    @Nullable
    public static GLFWErrorCallback createSafe(long functionPointer) {
        return functionPointer == NULL ? null : create(functionPointer);
    }

    /** Creates a {@code GLFWErrorCallback} instance that delegates to the specified {@code GLFWErrorCallbackI} instance. */
    public static GLFWErrorCallback create(GLFWErrorCallbackI instance) {
        return instance instanceof GLFWErrorCallback
            ? (GLFWErrorCallback)instance
            : new Container(instance.address(), instance);
    }

    protected GLFWErrorCallback() {
        super(CIF);
    }

    GLFWErrorCallback(long functionPointer) {
        super(functionPointer);
    }

    /**
     * Converts the specified {@code GLFWErrorCallback} argument to a String.
     *
     * This method may only be used inside a GLFWErrorCallback invocation.
     *
     * @param description pointer to the UTF-8 encoded description string
     *
     * @return the description as a String
     */
    public static String getDescription(long description) {
        return memUTF8(description);
    }

    /**
     * Returns a {@code GLFWErrorCallback} instance that prints the error to the {@link APIUtil#DEBUG_STREAM}.
     *
     * @return the GLFWerrorCallback
     */
    public static GLFWErrorCallback createPrint() {
        return createPrint(APIUtil.DEBUG_STREAM);
    }

    /**
     * Returns a {@code GLFWErrorCallback} instance that prints the error in the specified {@link PrintStream}.
     *
     * @param stream the PrintStream to use
     *
     * @return the GLFWerrorCallback
     */
    public static GLFWErrorCallback createPrint(PrintStream stream) {
        return new GLFWErrorCallback() {
            private Map ERROR_CODES = APIUtil.apiClassTokens((field, value) -> 0x10000 < value && value < 0x20000, null, GLFW.class);

            @Override
            public void invoke(int error, long description) {
                String msg = getDescription(description);

                StringBuilder sb = new StringBuilder(512);
                sb
                    .append("[LWJGL] ")
                    .append(ERROR_CODES.get(error))
                    .append(" error\n")
                    .append("\tDescription : ")
                    .append(msg)
                    .append("\n")
                    .append("\tStacktrace  :\n");

                StackTraceElement[] stack = Thread.currentThread().getStackTrace();
                for (int i = 4; i < stack.length; i++) {
                    sb.append("\t\t");
                    sb.append(stack[i]);
                    sb.append("\n");
                }

                stream.print(sb);
            }
        };
    }

    /**
     * Returns a {@code GLFWErrorCallback} instance that throws an {@link IllegalStateException} when an error occurs.
     *
     * @return the GLFWerrorCallback
     */
    public static GLFWErrorCallback createThrow() {
        return new GLFWErrorCallback() {
            @Override
            public void invoke(int error, long description) {
                throw new IllegalStateException(String.format("GLFW error [0x%X]: %s", error, getDescription(description)));
            }
        };
    }

    /** See {@link GLFW#glfwSetErrorCallback SetErrorCallback}. */
    public GLFWErrorCallback set() {
        glfwSetErrorCallback(this);
        return this;
    }

    private static final class Container extends GLFWErrorCallback {

        private final GLFWErrorCallbackI delegate;

        Container(long functionPointer, GLFWErrorCallbackI delegate) {
            super(functionPointer);
            this.delegate = delegate;
        }

        @Override
        public void invoke(int error, long description) {
            delegate.invoke(error, description);
        }

    }

}