/*
 * Copyright 2018 Allan Wang
 *
 * 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 ca.allanwang.kau.kotlin

/**
 * Created by Allan Wang on 2017-08-05.
 */

/**
 * Replica of [java.util.Vector.removeIf] in Java
 * Since we don't have access to the internals of our extended class,
 * We will simply iterate and remove when the filter returns {@code false}
 */
inline fun <T, C : MutableIterable<T>> C.kauRemoveIf(filter: (item: T) -> Boolean): C {
    val iter = iterator()
    while (iter.hasNext()) {
        if (filter(iter.next())) {
            iter.remove()
        }
    }
    return this
}

/**
 * Returns the first element tha matches the predicate,
 * or null if no match is found
 */
inline fun <T : Any> Iterator<T>.firstOrNull(predicate: (T) -> Boolean): T? {
    while (hasNext()) {
        val data = next()
        if (predicate(data)) {
            return data
        }
    }
    return null
}
