| // *************************************************************************************************************************** |
| // * 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.juneau.assertions; |
| |
| import java.util.function.*; |
| |
| import org.apache.juneau.common.internal.*; |
| import org.apache.juneau.cp.*; |
| |
| /** |
| * Utility class for performing simple validations on objects. |
| * |
| * <p> |
| * Verifications that pass return a null string. Verifications that don't pass return a string with a useful |
| * error message. |
| * |
| * <h5 class='section'>Example:</h5> |
| * <p class='bjava'> |
| * <jc>// Validates that our POJO is of type MyBean.</jc> |
| * String <jv>errorMessage</jv> = <jsm>verify</jsm>(<jv>myPojo</jv>).isType(MyBean.<jk>class</jk>); |
| * <jk>if</jk> (<jv>errorMessage</jv> != <jk>null</jk>) |
| * <jk>throw new</jk> RuntimeException(<jv>errorMessage</jv>); |
| * </p> |
| * |
| * <h5 class='section'>See Also:</h5><ul> |
| * <li class='link'><a class="doclink" href="../../../../index.html#ja.Overview">Overview > juneau-assertions > Overview</a> |
| * </ul> |
| */ |
| public class Verify { |
| |
| //----------------------------------------------------------------------------------------------------------------- |
| // Static |
| //----------------------------------------------------------------------------------------------------------------- |
| |
| private static final Messages MESSAGES = Messages.of(Verify.class, "Messages"); |
| static final String |
| MSG_unexpectedType = MESSAGES.getString("unexpectedType"), |
| MSG_unexpectedValue = MESSAGES.getString("unexpectedValue"); |
| |
| /** |
| * Create a new verifier object. |
| * |
| * @param o The object being verified. |
| * @return A new verifier object. |
| */ |
| public static Verify verify(Object o) { |
| return new Verify(o); |
| } |
| |
| //----------------------------------------------------------------------------------------------------------------- |
| // Instance |
| //----------------------------------------------------------------------------------------------------------------- |
| |
| private final Object o; |
| private Supplier<String> msg; |
| |
| /** |
| * Create a new verifier object. |
| * |
| * @param o The object being verified. |
| */ |
| protected Verify(Object o) { |
| this.o = o; |
| } |
| |
| //----------------------------------------------------------------------------------------------------------------- |
| // Config setters |
| //----------------------------------------------------------------------------------------------------------------- |
| |
| /** |
| * Overrides the default error message produced by the verification. |
| * |
| * @param msg The error message. |
| * @param args Optional message arguments. |
| * @return This object. |
| */ |
| public Verify msg(String msg, Object args) { |
| this.msg = () -> StringUtils.format(msg, args); |
| return this; |
| } |
| |
| //----------------------------------------------------------------------------------------------------------------- |
| // Test methods |
| //----------------------------------------------------------------------------------------------------------------- |
| |
| /** |
| * Verifies that this object is of the specified type. |
| * |
| * @param type The type to test against. |
| * @return An error message if the object is not of the specified type, otherwise <jk>null</jk>. |
| */ |
| public String isType(Class<?> type) { |
| if ((type == null && o == null) || (type != null && type.isInstance(o))) |
| return null; |
| return msg != null ? msg.get() : StringUtils.format(MSG_unexpectedType, type, (o == null ? null : o.getClass())); |
| } |
| |
| /** |
| * Verifies that this object is equal to the specified object. |
| * |
| * @param expected The object to test against for equality. |
| * @return An error message if the object is not equal to the specified object, otherwise <jk>null</jk>. |
| */ |
| public String is(Object expected) { |
| if (expected == o) |
| return null; |
| if (expected == null || o == null || ! expected.equals(o)) |
| return msg != null ? msg.get() : StringUtils.format(MSG_unexpectedValue, expected, o); |
| return null; |
| } |
| |
| /** |
| * Verifies that this object is equal to {@link Boolean#TRUE}. |
| * |
| * @return An error message if the object is not true, otherwise <jk>null</jk>. |
| */ |
| public String isTrue() { |
| return is(true); |
| } |
| |
| /** |
| * Verifies that this object is equal to {@link Boolean#FALSE}. |
| * |
| * @return An error message if the object is not false, otherwise <jk>null</jk>. |
| */ |
| public String isFalse() { |
| return is(false); |
| } |
| } |