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The goal of quality-check is to provide a small Java library for basic runtime code quality checks. It provides similar features to org.springframework.util.Assert or com.google.common.base.Preconditions without the need to include big libraries or frameworks such as Spring or Guava. The package quality-check tries to replace these libraries and provide all the basic code quality checks you need. The checks provided here are typically used to validate method parameters and detect errors during runtime. To detect errors before runtime we use JSR-305 Annotations. With these annotations you are able to detect possible bugs earlier. For more informations look at FindBugs™ JSR-305 support.

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/*******************************************************************************
 * Copyright 2013 André Rouél and Dominik Seichter
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package net.sf.qualitycheck.exception;

import javax.annotation.Nullable;

/**
 * Thrown to indicate that a method has been passed with an empty reference as argument that does not accept it as
 * valid. For example, if a method needs a string with a length greater than 0 and is passed with an empty string.
 * 
 * @author André Rouél
 * @author Dominik Seichter
 */
public class IllegalEmptyArgumentException extends RuntimeException {

	private static final long serialVersionUID = -6988558700678645359L;

	/**
	 * Default message to indicate that the a given argument must not be empty.
	 */
	protected static final String DEFAULT_MESSAGE = "The passed argument must not be empty.";

	/**
	 * Message to indicate that the the given argument with name must not be empty.
	 */
	protected static final String MESSAGE_WITH_NAME = "The passed argument '%s' must not be empty.";

	/**
	 * Determines the message to be used, depending on the passed argument name. If if the given argument name is
	 * {@code null} or empty {@code DEFAULT_MESSAGE} will be returned, otherwise a formatted {@code MESSAGE_WITH_NAME}
	 * with the passed name.
	 * 
	 * @param argumentName
	 *            the name of the passed argument
	 * @return {@code DEFAULT_MESSAGE} if the given argument name is {@code null} or empty, otherwise a formatted
	 *         {@code MESSAGE_WITH_NAME}
	 */
	private static String determineMessage(@Nullable final String argumentName) {
		return argumentName != null && !argumentName.isEmpty() ? format(argumentName) : DEFAULT_MESSAGE;
	}

	/**
	 * Returns the formatted string {@link IllegalEmptyArgumentException#MESSAGE_WITH_NAME} with the given
	 * {@code argumentName}.
	 * 
	 * @param argumentName
	 *            the name of the passed argument
	 * @return a formatted string of message with the given argument name
	 */
	private static String format(@Nullable final String argumentName) {
		return String.format(MESSAGE_WITH_NAME, argumentName);
	}

	/**
	 * Constructs an {@code IllegalNullArgumentException} with the default message
	 * {@link IllegalEmptyArgumentException#DEFAULT_MESSAGE}.
	 */
	public IllegalEmptyArgumentException() {
		super(DEFAULT_MESSAGE);
	}

	/**
	 * Constructs an {@code IllegalNullArgumentException} with the message
	 * {@link IllegalEmptyArgumentException#MESSAGE_WITH_NAME} including the given name of the argument as string
	 * representation.
	 * 
	 * @param argumentName
	 *            the name of the passed argument
	 */
	public IllegalEmptyArgumentException(@Nullable final String argumentName) {
		super(determineMessage(argumentName));
	}

	/**
	 * Constructs a new exception with the message {@link IllegalEmptyArgumentException#MESSAGE_WITH_NAME} including the
	 * given name as string representation and cause.
	 * 
	 * @param argumentName
	 *            the name of the passed argument
	 * @param cause
	 *            the cause (which is saved for later retrieval by the {@link Throwable#getCause()} method). (A
	 *            {@code null} value is permitted, and indicates that the cause is nonexistent or unknown.)
	 */
	public IllegalEmptyArgumentException(@Nullable final String argumentName, @Nullable final Throwable cause) {
		super(determineMessage(argumentName), cause);
	}

	/**
	 * Constructs a new exception with the default message {@link IllegalEmptyArgumentException#DEFAULT_MESSAGE}.
	 * 
	 * @param cause
	 *            the cause (which is saved for later retrieval by the {@link Throwable#getCause()} method). (A
	 *            {@code null} value is permitted, and indicates that the cause is nonexistent or unknown.)
	 */
	public IllegalEmptyArgumentException(@Nullable final Throwable cause) {
		super(DEFAULT_MESSAGE, cause);
	}

}