org.jetbrains.kotlin.diagnostics.rendering.RenderingContext.kt Maven / Gradle / Ivy

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/*
 * Copyright 2010-2016 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.diagnostics.rendering

import org.jetbrains.kotlin.diagnostics.*

// holds data about the parameters of the diagnostic we're about to render
sealed class RenderingContext {
    abstract operator fun  get(key: Key): T

    abstract class Key(val name: String) {
        abstract fun compute(objectsToRender: Collection): T
    }

    class Impl(private val objectsToRender: Collection) : RenderingContext() {
        private val data = linkedMapOf, Any?>()

        override fun  get(key: Key): T {
            if (!data.containsKey(key)) {
                val result = key.compute(objectsToRender)
                data[key] = result
                return result
            }
            return data[key] as T
        }
    }


    object Empty : RenderingContext() {
        override fun  get(key: Key): T {
            return key.compute(emptyList())
        }
    }

    companion object {
        @JvmStatic
        fun of(vararg objectsToRender: Any?): RenderingContext {
            return Impl(objectsToRender.toList())
        }

        @JvmStatic
        fun fromDiagnostic(d: Diagnostic): RenderingContext {
            val parameters = when (d) {
                is SimpleDiagnostic<*> -> listOf()
                is DiagnosticWithParameters1<*, *> -> listOf(d.a)
                is DiagnosticWithParameters2<*, *, *> -> listOf(d.a, d.b)
                is DiagnosticWithParameters3<*, *, *, *> -> listOf(d.a, d.b, d.c)
                is ParametrizedDiagnostic<*> -> error("Unexpected diagnostic: ${d.javaClass}")
                else -> listOf()
            }
            return Impl(parameters)
        }
    }
}