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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.wicket.util.lang;
import java.util.Collection;
import org.apache.wicket.util.string.Strings;
/**
* Class with methods for asserting conditions on arguments.
*/
public class Args
{
/**
* Checks argument is not null
*
* @param
* @param argument
* @param name
* @return The 'argument' parameter
* @throws IllegalArgumentException
*/
public static T notNull(final T argument, final String name)
{
if (argument == null)
{
throw new IllegalArgumentException("Argument '" + name + "' may not be null.");
}
return argument;
}
/**
* Checks argument is not empty (not null and has a non-whitespace character)
*
* @param
* the type of the argument to check for emptiness
*
* @param argument
* the argument to check for emptiness
* @param name
* the name to use in the error message
* @return The {@code argument} parameter if not empty
* @throws IllegalArgumentException
* when the passed {@code argument} is empty
*/
public static T notEmpty(final T argument, final String name)
{
if (Strings.isEmpty(argument))
{
throw new IllegalArgumentException("Argument '" + name + "' may not be null or empty.");
}
return argument;
}
/**
*
* Checks argument is not null or empty
*
* @param collection
* @param message
* @param params
* @return the {code collection}
* @throws IllegalArgumentException
* if the passed collection is either null or empty
*/
public static > T notEmpty(final T collection, final String message,
final Object... params)
{
if (collection == null || collection.isEmpty())
{
throw new IllegalArgumentException(Args.format(message, params));
}
return collection;
}
/**
* Checks argument is not null or empty
*
* @param collection
* @param name
* @return the {code collection}
* @throws IllegalArgumentException
* if the passed collection is either null or empty
*/
public static > T notEmpty(final T collection, final String name)
{
return notEmpty(collection, "Collection '%s' may not be null or empty.", name);
}
/**
* Checks if argument is within a range
*
* @param
* @param min
* @param max
* @param value
* @param name
* @return the {code value}
* @throws IllegalArgumentException
*/
public static > T withinRange(final T min, final T max,
final T value, final String name)
{
notNull(min, name);
notNull(max, name);
if ((value.compareTo(min) < 0) || (value.compareTo(max) > 0))
{
throw new IllegalArgumentException(
String.format("Argument '%s' must have a value within [%s,%s], but was %s", name,
min, max, value));
}
return value;
}
/**
* Check if argument is true
*
* @param argument
* @param msg
* @param params
* @return argument
*/
public static boolean isTrue(final boolean argument, final String msg, final Object... params)
{
if (argument == false)
{
throw new IllegalArgumentException(format(msg, params));
}
return argument;
}
/**
* Check if argument is false
*
* @param argument
* @param msg
* @param params
* @return argument
*/
public static boolean isFalse(final boolean argument, final String msg, final Object... params)
{
if (argument == true)
{
throw new IllegalArgumentException(format(msg, params));
}
return argument;
}
/**
* Format the message. Allow for "{}" as well as %s etc. (see Formatter).
*
* @param msg
* @param params
* @return formatted message
*/
static String format(String msg, final Object... params)
{
msg = msg.replaceAll("\\{\\}", "%s");
return String.format(msg, params);
}
}
