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/*
 * Copyright (c) 2019 JetBrains s.r.o.
 * Use of this source code is governed by the MIT license that can be found in the LICENSE file.
 *
 * This file has been modified by JetBrains : Java code has been converted to Kotlin code.
 *
 * THE FOLLOWING IS THE COPYRIGHT OF THE ORIGINAL DOCUMENT:
 *
 * Copyright (C) 2007 The Guava Authors
 *
 * 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
 *
 * https://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 jetbrains.datalore.base.gcommon.base

object Preconditions {
    fun checkState(expression: Boolean) {
        if (!expression) {
            throw IllegalStateException()
        }
    }

    fun checkState(expression: Boolean, errorMessage: Any) {
        if (!expression) {
            throw IllegalStateException(errorMessage.toString())
        }
    }

    fun checkArgument(expression: Boolean) {
        if (!expression) {
            throw IllegalArgumentException()
        }
    }

    fun checkArgument(expression: Boolean, errorMessage: Any) {
        if (!expression) {
            throw IllegalArgumentException(errorMessage.toString())
        }
    }

    // ToDo: use `checkNotNull` from kotlin std-lib
    fun  checkNotNull(reference: T?): T {
        if (reference == null) {
            throw NullPointerException()
        }
        return reference
    }
}