org.jetbrains.jet.lang.resolve.java.structure.impl.JavaClassifierTypeImpl Maven / Gradle / Ivy

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/*
 * Copyright 2010-2013 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.jet.lang.resolve.java.structure.impl;

import com.intellij.psi.*;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.jet.lang.resolve.java.structure.*;

import java.util.*;

import static org.jetbrains.jet.lang.resolve.java.structure.impl.JavaElementCollectionFromPsiArrayUtil.types;

public class JavaClassifierTypeImpl extends JavaTypeImpl implements JavaClassifierType {
    private static class ResolutionResult {
        private final JavaClassifier classifier;
        private final JavaTypeSubstitutor substitutor;

        private ResolutionResult(@Nullable JavaClassifier classifier, @NotNull JavaTypeSubstitutor substitutor) {
            this.classifier = classifier;
            this.substitutor = substitutor;
        }
    }

    private ResolutionResult resolutionResult;

    public JavaClassifierTypeImpl(@NotNull PsiClassType psiClassType) {
        super(psiClassType);
    }

    @Override
    @Nullable
    public JavaClassifier getClassifier() {
        resolve();
        return resolutionResult.classifier;
    }

    @Override
    @NotNull
    public JavaTypeSubstitutor getSubstitutor() {
        resolve();
        return resolutionResult.substitutor;
    }

    private void resolve() {
        if (resolutionResult == null) {
            PsiClassType.ClassResolveResult result = getPsi().resolveGenerics();
            PsiClass psiClass = result.getElement();
            PsiSubstitutor substitutor = result.getSubstitutor();
            resolutionResult = new ResolutionResult(
                    psiClass == null ? null : JavaClassifierImpl.create(psiClass),
                    new JavaTypeSubstitutorImpl(convertSubstitutionMap(substitutor.getSubstitutionMap()))
            );
        }
    }

    @NotNull
    private Map convertSubstitutionMap(@NotNull Map psiMap) {
        Map substitutionMap = new HashMap();
        for (Map.Entry entry : psiMap.entrySet()) {
            PsiType value = entry.getValue();
            substitutionMap.put(new JavaTypeParameterImpl(entry.getKey()), value == null ? null : JavaTypeImpl.create(value));
        }

        return substitutionMap;
    }

    @Override
    @NotNull
    public Collection getSupertypes() {
        PsiType[] psiTypes = getPsi().getSuperTypes();
        if (psiTypes.length == 0) return Collections.emptyList();
        List result = new ArrayList(psiTypes.length);
        for (PsiType psiType : psiTypes) {
            if (!(psiType instanceof PsiClassType)) {
                throw new IllegalStateException("Supertype should be a class: " + psiType + ", type: " + getPsi());
            }
            result.add(new JavaClassifierTypeImpl((PsiClassType) psiType));
        }
        return result;
    }

    @Override
    @NotNull
    public String getPresentableText() {
        return getPsi().getPresentableText();
    }

    @Override
    public boolean isRaw() {
        return getPsi().isRaw();
    }

    @Override
    @NotNull
    public List getTypeArguments() {
        return types(getPsi().getParameters());
    }
}