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ParameterValidator.java
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ParameterValidator.java
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/**
* Copyright (c) 2012, Ben Fortuna
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* o Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* o Neither the name of Ben Fortuna nor the names of any other contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package net.fortuna.ical4j.validate;
import net.fortuna.ical4j.model.Parameter;
import net.fortuna.ical4j.model.ParameterList;
import static net.fortuna.ical4j.validate.Validator.assertFalse;
/**
* $Id$ [15-May-2004]
*
* Defines methods for validating parameters and parameter
* lists.
*
* @author Ben Fortuna
*/
public final class ParameterValidator {
public static final String ASSERT_NONE_MESSAGE = "Parameter [{0}] is not applicable";
public static final String ASSERT_ONE_OR_LESS_MESSAGE = "Parameter [{0}] must only be specified once";
public static final String ASSERT_ONE_MESSAGE = "Parameter [{0}] must be specified once";
private static final String ASSERT_NULL_OR_EQUAL_MESSAGE = "Parameter [{0}] is invalid";
/**
* Constructor made private to enforce static nature.
*/
private ParameterValidator() {
}
/**
* Ensure a parameter occurs no more than once.
*
* @param paramName
* the parameter name
* @param parameters
* a list of parameters to query
* @throws ValidationException
* when the specified parameter occurs more than once
*/
public static void assertOneOrLess(final String paramName, final ParameterList parameters)
throws ValidationException {
assertFalse(parameters1 -> parameters1.getParameters(paramName).size() > 1, ASSERT_ONE_OR_LESS_MESSAGE, false,
parameters, paramName);
}
/**
* Ensure a parameter occurs once.
*
* @param paramName
* the parameter name
* @param parameters
* a list of parameters to query
* @throws ValidationException
* when the specified parameter does not occur once
*/
public static void assertOne(final String paramName, final ParameterList parameters) throws ValidationException {
assertFalse(parameters1 -> parameters1.getParameters(paramName).size() != 1, ASSERT_ONE_MESSAGE, false,
parameters, paramName);
}
/**
* Ensure a parameter doesn't occur in the specified list.
* @param paramName the name of a parameter
* @param parameters a list of parameters
* @throws ValidationException thrown when the specified property
* is found in the list of properties
*/
public static void assertNone(final String paramName, final ParameterList parameters) throws ValidationException {
assertFalse(parameters1 -> parameters1.getParameter(paramName) != null, ASSERT_NONE_MESSAGE, false,
parameters, paramName);
}
/**
* @param param a parameter instance
* @param parameters a list of parameters
* @throws ValidationException where the assertion fails
*/
public static void assertNullOrEqual(final Parameter param, final ParameterList parameters) throws ValidationException {
final Parameter p = parameters.getParameter(param.getName());
if (p != null && !param.equals(p)) {
throw new ValidationException(ASSERT_NULL_OR_EQUAL_MESSAGE, new Object[] {p});
}
}
}