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comparison: src/net/fortuna/ical4j/util/ParameterValidator.java
src/net/fortuna/ical4j/util/ParameterValidator.java
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| 1 /** | |
| 2 * Copyright (c) 2012, Ben Fortuna | |
| 3 * All rights reserved. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions | |
| 7 * are met: | |
| 8 * | |
| 9 * o Redistributions of source code must retain the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer. | |
| 11 * | |
| 12 * o Redistributions in binary form must reproduce the above copyright | |
| 13 * notice, this list of conditions and the following disclaimer in the | |
| 14 * documentation and/or other materials provided with the distribution. | |
| 15 * | |
| 16 * o Neither the name of Ben Fortuna nor the names of any other contributors | |
| 17 * may be used to endorse or promote products derived from this software | |
| 18 * without specific prior written permission. | |
| 19 * | |
| 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
| 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
| 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
| 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 31 */ | |
| 32 package net.fortuna.ical4j.util; | |
| 33 | |
| 34 import net.fortuna.ical4j.model.Parameter; | |
| 35 import net.fortuna.ical4j.model.ParameterList; | |
| 36 import net.fortuna.ical4j.model.ValidationException; | |
| 37 | |
| 38 /** | |
| 39 * $Id$ [15-May-2004] | |
| 40 * | |
| 41 * Defines methods for validating parameters and parameter | |
| 42 * lists. | |
| 43 * | |
| 44 * @author Ben Fortuna | |
| 45 */ | |
| 46 public final class ParameterValidator { | |
| 47 | |
| 48 private static final String ASSERT_NONE_MESSAGE = "Parameter [{0}] is not applicable"; | |
| 49 | |
| 50 private static final String ASSERT_ONE_OR_LESS_MESSAGE = "Parameter [{0}] must only be specified once"; | |
| 51 | |
| 52 private static final String ASSERT_ONE_MESSAGE = "Parameter [{0}] must be specified once"; | |
| 53 | |
| 54 private static final String ASSERT_NULL_OR_EQUAL_MESSAGE = "Parameter [{0}] is invalid"; | |
| 55 | |
| 56 private static ParameterValidator instance = new ParameterValidator(); | |
| 57 | |
| 58 /** | |
| 59 * Constructor made private to enforce singleton. | |
| 60 */ | |
| 61 private ParameterValidator() { | |
| 62 } | |
| 63 | |
| 64 /** | |
| 65 * Ensure a parameter occurs no more than once. | |
| 66 * | |
| 67 * @param paramName | |
| 68 * the parameter name | |
| 69 * @param parameters | |
| 70 * a list of parameters to query | |
| 71 * @throws ValidationException | |
| 72 * when the specified parameter occurs more than once | |
| 73 */ | |
| 74 public void assertOneOrLess(final String paramName, | |
| 75 final ParameterList parameters) throws ValidationException { | |
| 76 | |
| 77 if (parameters.getParameters(paramName).size() > 1) { | |
| 78 throw new ValidationException(ASSERT_ONE_OR_LESS_MESSAGE, new Object[] {paramName}); | |
| 79 } | |
| 80 } | |
| 81 | |
| 82 /** | |
| 83 * Ensure a parameter occurs once. | |
| 84 * | |
| 85 * @param paramName | |
| 86 * the parameter name | |
| 87 * @param parameters | |
| 88 * a list of parameters to query | |
| 89 * @throws ValidationException | |
| 90 * when the specified parameter does not occur once | |
| 91 */ | |
| 92 public void assertOne(final String paramName, | |
| 93 final ParameterList parameters) throws ValidationException { | |
| 94 | |
| 95 if (parameters.getParameters(paramName).size() != 1) { | |
| 96 throw new ValidationException(ASSERT_ONE_MESSAGE, new Object[] {paramName}); | |
| 97 } | |
| 98 } | |
| 99 | |
| 100 /** | |
| 101 * Ensure a parameter doesn't occur in the specified list. | |
| 102 * @param paramName the name of a parameter | |
| 103 * @param parameters a list of parameters | |
| 104 * @throws ValidationException thrown when the specified property | |
| 105 * is found in the list of properties | |
| 106 */ | |
| 107 public void assertNone(final String paramName, final ParameterList parameters) throws ValidationException { | |
| 108 if (parameters.getParameter(paramName) != null) { | |
| 109 throw new ValidationException(ASSERT_NONE_MESSAGE, new Object[] {paramName}); | |
| 110 } | |
| 111 } | |
| 112 | |
| 113 /** | |
| 114 * @param param a parameter instance | |
| 115 * @param parameters a list of parameters | |
| 116 * @throws ValidationException where the assertion fails | |
| 117 */ | |
| 118 public void assertNullOrEqual(final Parameter param, final ParameterList parameters) throws ValidationException { | |
| 119 final Parameter p = parameters.getParameter(param.getName()); | |
| 120 if (p != null && !param.equals(p)) { | |
| 121 throw new ValidationException(ASSERT_NULL_OR_EQUAL_MESSAGE, new Object[] {p}); | |
| 122 } | |
| 123 } | |
| 124 | |
| 125 /** | |
| 126 * @return Returns the instance. | |
| 127 */ | |
| 128 public static ParameterValidator getInstance() { | |
| 129 return instance; | |
| 130 } | |
| 131 } |
