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Functional wrapper for try-catch-finally
There is a newer version: 1.0.3
/*
 *Copyright (c) 2015, AEGIS DATA SOLUTIONS, All rights reserved. 
 */
package com.aegisql.util.function;

import java.io.PrintStream;
import java.util.Objects;
import java.util.function.Function;

import org.slf4j.Logger;

// TODO: Auto-generated Javadoc
/**
 * The Interface ExceptionBlock.
 * @author Mikhail Teplitskiy
 *
 * @param  the generic type
 */
@FunctionalInterface
public interface ExceptionBlock  {
	
	/**
	 * Accept.
	 *
	 * @param error the error
	 * @throws Throwable the throwable
	 */
	public void accept(T error) throws Throwable;

	/**
	 * Identity.
	 *
	 * @param it the it
	 * @return the exception block
	 */
	public default ExceptionBlock identity(ExceptionBlock it) {
		Objects.requireNonNull(it);
		return it;
	}
	
	/**
	 * And then.
	 *
	 * @param after the after
	 * @return the exception block
	 */
	public default ExceptionBlock andThen(ExceptionBlock after) {
		Objects.requireNonNull(after);
		return (T t) -> {
			this.accept(t);
			after.accept(t);
		};
	}

	/**
	 * Compose.
	 *
	 * @param after the after
	 * @return the exception block
	 */
	public default ExceptionBlock compose(ExceptionBlock after) {
		Objects.requireNonNull(after);
		return (T t) -> {
			after.accept(t);
			this.accept(t);
		};
	}

	/**
	 * And die.
	 *
	 * @return the exception block
	 */
	public default ExceptionBlock andDie() {
		return (T t) -> {
			this.accept(t);
			throw t;
		};
	}

	/**
	 * And die as.
	 *
	 * @param wrapper the wrapper
	 * @param errMessage the err message
	 * @return the exception block
	 */
	public default ExceptionBlock andDieAs(Class wrapper,  String errMessage) {
		Function f = ExceptionHandler.wrapCommentedThrowable().apply((Class) wrapper).apply(errMessage);
		return (T t) -> {
			this.accept(t);
			Throwable wrapped = f.apply(t);
			throw wrapped;
		};
	}
	
	/**
	 * Prints the stack trace.
	 *
	 * @return the exception block
	 */
	public default ExceptionBlock printStackTrace() {
		return andThen( t -> t.printStackTrace() );
	}

	/**
	 * Prints the stack trace.
	 *
	 * @param pStr the str
	 * @return the exception block
	 */
	public default ExceptionBlock printStackTrace(PrintStream pStr) {
		return andThen( t -> t.printStackTrace(pStr) );
	}

	/**
	 * Prints the error message.
	 *
	 * @return the exception block
	 */
	public default ExceptionBlock printErrorMessage() {
		return andThen( t -> System.out.println(t.getMessage()) );
	}

	/**
	 * Log debug stack trace.
	 *
	 * @param log the SLF4J logger
	 * @param preffix the preffix of the log message
	 * @param params - variables supported by the SLF4J
	 * @return the exception block
	 */
	public default ExceptionBlock logError(Logger log, String preffix, Object... params) {
		return (T t) -> {
			if(log.isErrorEnabled()) {
				log.error(preffix + ExceptionHandler.toString(t), params);
			}
			this.accept(t);
		};
	}

	/**
	 * Log warn stack trace.
	 *
	 * @param log the SLF4J logger
	 * @param preffix the preffix of the log message
	 * @param params - variables supported by the SLF4J
	 * @return the exception block
	 */
	public default ExceptionBlock logWarn(Logger log, String preffix, Object... params) {
		return (T t) -> {
			if(log.isWarnEnabled()) {
				log.warn(preffix + ExceptionHandler.toString(t), params);
			}
			this.accept(t);
		};
	}

	/**
	 * Log info stack trace.
	 *
	 * @param log the SLF4J logger
	 * @param preffix the preffix of the log message
	 * @param params - variables supported by the SLF4J
	 * @return the exception block
	 */
	public default ExceptionBlock logInfo(Logger log, String preffix, Object... params) {
		return (T t) -> {
			if(log.isInfoEnabled()) {
				log.info(preffix + ExceptionHandler.toString(t), params);
			}
			this.accept(t);
		};
	}
	
	/**
	 * Log debug stack trace.
	 *
	 * @param log the SLF4J logger
	 * @param preffix the preffix of the log message
	 * @param params - variables supported by the SLF4J
	 * @return the exception block
	 */
	public default ExceptionBlock logDebug(Logger log, String preffix, Object... params) {
		return (T t) -> {
			if(log.isDebugEnabled()) {
				log.debug(preffix + ExceptionHandler.toString(t), params);
			}
			this.accept(t);
		};
	}

	/**
	 * Log trace stack trace.
	 *
	 * @param log the SLF4J logger
	 * @param preffix the preffix of the log message
	 * @param params - variables supported by the SLF4J
	 * @return the exception block
	 */
	public default ExceptionBlock logTrace(Logger log, String preffix, Object... params) {
		return (T t) -> {
			if(log.isTraceEnabled()) {
				log.trace(preffix + ExceptionHandler.toString(t), params);
			}
			this.accept(t);
		};
	}

	
}