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.resolve;
018    
019    import com.intellij.psi.PsiElement;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.annotations.Nullable;
022    import org.jetbrains.jet.lang.diagnostics.Diagnostic;
023    
024    import java.util.Collection;
025    import java.util.Collections;
026    import java.util.Iterator;
027    
028    public interface Diagnostics extends Iterable<Diagnostic> {
029        @NotNull
030        Collection<Diagnostic> all();
031    
032        @NotNull
033        Collection<Diagnostic> forElement(@NotNull PsiElement psiElement);
034    
035        boolean isEmpty();
036    
037        @NotNull
038        Diagnostics noSuppression();
039    
040        Diagnostics EMPTY = new Diagnostics() {
041            @NotNull
042            @Override
043            public Collection<Diagnostic> all() {
044                return Collections.emptyList();
045            }
046    
047            @NotNull
048            @Override
049            public Collection<Diagnostic> forElement(@NotNull PsiElement psiElement) {
050                return Collections.emptyList();
051            }
052    
053            @Override
054            public boolean isEmpty() {
055                return true;
056            }
057    
058            @NotNull
059            @Override
060            public Diagnostics noSuppression() {
061                return this;
062            }
063    
064            @NotNull
065            @Override
066            public Iterator<Diagnostic> iterator() {
067                return all().iterator();
068            }
069        };
070    }