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/*
 * Copyright 2008-present MongoDB, Inc.
 * Copyright (c) 2008-2014 Atlassian Pty Ltd
 *
 * 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 org.bson.assertions;

/**
 * 

Design by contract assertions.

This class is not part of the public API and may be removed or changed at any time.

*/ public final class Assertions { /** * Throw IllegalArgumentException if the value is null. * * @param name the parameter name * @param value the value that should not be null * @param the value type * @return the value * @throws IllegalArgumentException if value is null */ public static T notNull(final String name, final T value) { if (value == null) { throw new IllegalArgumentException(name + " can not be null"); } return value; } /** * Throw IllegalStateException if the condition if false. * * @param name the name of the state that is being checked * @param condition the condition about the parameter to check * @throws IllegalStateException if the condition is false */ public static void isTrue(final String name, final boolean condition) { if (!condition) { throw new IllegalStateException("state should be: " + name); } } /** * Throw IllegalArgumentException if the condition if false. * * @param name the name of the state that is being checked * @param condition the condition about the parameter to check * @throws IllegalArgumentException if the condition is false */ public static void isTrueArgument(final String name, final boolean condition) { if (!condition) { throw new IllegalArgumentException("state should be: " + name); } } /** * Cast an object to the given class and return it, or throw IllegalArgumentException if it's not assignable to that class. * * @param clazz the class to cast to * @param value the value to cast * @param errorMessage the error message to include in the exception * @param the Class type * @return value cast to clazz * @throws IllegalArgumentException if value is not assignable to clazz */ @SuppressWarnings("unchecked") public static T convertToType(final Class clazz, final Object value, final String errorMessage) { if (!clazz.isAssignableFrom(value.getClass())) { throw new IllegalArgumentException(errorMessage); } return (T) value; } private Assertions() { } }




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