001    /*
002     * Copyright 2010-2013 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package org.jetbrains.jet.lang.psi;
018    
019    import com.intellij.extapi.psi.ASTWrapperPsiElement;
020    import com.intellij.lang.ASTNode;
021    import com.intellij.lang.Language;
022    import com.intellij.psi.PsiElementVisitor;
023    import com.intellij.psi.PsiReference;
024    import com.intellij.psi.PsiReferenceService;
025    import com.intellij.psi.impl.source.resolve.reference.ReferenceProvidersRegistry;
026    import org.jetbrains.annotations.NotNull;
027    import org.jetbrains.jet.plugin.JetLanguage;
028    
029    public class JetElementImpl extends ASTWrapperPsiElement implements JetElement {
030        public JetElementImpl(@NotNull ASTNode node) {
031            super(node);
032        }
033    
034        @NotNull
035        @Override
036        public Language getLanguage() {
037            return JetLanguage.INSTANCE;
038        }
039    
040        @Override
041        public String toString() {
042            return getNode().getElementType().toString();
043        }
044    
045        @Override
046        public final void accept(@NotNull PsiElementVisitor visitor) {
047            if (visitor instanceof JetVisitorVoid) {
048                accept((JetVisitorVoid) visitor);
049            }
050            else {
051                visitor.visitElement(this);
052            }
053        }
054    
055        @Override
056        public <D> void acceptChildren(@NotNull JetTreeVisitor<D> visitor, D data) {
057            JetPsiUtil.visitChildren(this, visitor, data);
058        }
059    
060        @Override
061        public void accept(@NotNull JetVisitorVoid visitor) {
062            visitor.visitJetElement(this);
063        }
064        
065        @Override
066        public <R, D> R accept(@NotNull JetVisitor<R, D> visitor, D data) {
067            return visitor.visitJetElement(this, data);
068        }
069    
070        @Override
071        public PsiReference getReference() {
072            PsiReference[] references = getReferences();
073            if (references.length == 1) return references[0];
074            else return null;
075        }
076    
077        @NotNull
078        @Override
079        public PsiReference[] getReferences() {
080            return ReferenceProvidersRegistry.getReferencesFromProviders(this, PsiReferenceService.Hints.NO_HINTS);
081        }
082    }