/*
 * Copyright 2010-2017 JetBrains s.r.o.
 *
 * 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.jetbrains.kotlin.resolve.calls.smartcasts

class ConditionalDataFlowInfo(val thenInfo: DataFlowInfo, val elseInfo: DataFlowInfo = thenInfo) {
    fun and(other: ConditionalDataFlowInfo): ConditionalDataFlowInfo = when {
        this == EMPTY -> other
        other == EMPTY -> this
        else -> ConditionalDataFlowInfo(this.thenInfo.and(other.thenInfo), this.elseInfo.and(other.elseInfo))
    }

    fun or(other: ConditionalDataFlowInfo): ConditionalDataFlowInfo = when {
        this == EMPTY -> other
        other == EMPTY -> this
        else -> ConditionalDataFlowInfo(this.thenInfo.or(other.thenInfo), this.elseInfo.or(other.elseInfo))
    }

    companion object {
        val EMPTY = ConditionalDataFlowInfo(DataFlowInfo.EMPTY)
    }
}