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the Kotlin compiler

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/*
 * Copyright 2010-2015 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.psi;

import com.intellij.lang.ASTNode;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.lexer.JetTokens;
import org.jetbrains.kotlin.psi.stubs.KotlinPlaceHolderStub;
import org.jetbrains.kotlin.psi.stubs.elements.JetStubElementTypes;

import java.util.Collections;
import java.util.List;

public class JetNullableType extends JetElementImplStub> implements JetTypeElement {
    public JetNullableType(@NotNull ASTNode node) {
        super(node);
    }

    public JetNullableType(@NotNull KotlinPlaceHolderStub stub) {
        super(stub, JetStubElementTypes.NULLABLE_TYPE);
    }

    @NotNull
    public ASTNode getQuestionMarkNode() {
        return getNode().findChildByType(JetTokens.QUEST);
    }

    @NotNull
    @Override
    public List getTypeArgumentsAsTypes() {
        JetTypeElement innerType = getInnerType();
        return innerType == null ? Collections.emptyList() : innerType.getTypeArgumentsAsTypes();
    }

    @Override
    public  R accept(@NotNull JetVisitor visitor, D data) {
        return visitor.visitNullableType(this, data);
    }

    @Nullable
    @IfNotParsed
    public JetTypeElement getInnerType() {
        return JetStubbedPsiUtil.getStubOrPsiChild(this, JetStubElementTypes.TYPE_ELEMENT_TYPES, JetTypeElement.ARRAY_FACTORY);
    }
}