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.cli.jvm.compiler;
018    
019    import com.intellij.openapi.vfs.VirtualFile;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.annotations.Nullable;
022    import org.jetbrains.jet.lang.resolve.kotlin.VirtualFileFinder;
023    import org.jetbrains.jet.lang.resolve.kotlin.VirtualFileKotlinClass;
024    import org.jetbrains.jet.lang.resolve.kotlin.header.KotlinClassHeader;
025    import org.jetbrains.jet.lang.resolve.name.FqName;
026    
027    public class CliVirtualFileFinder implements VirtualFileFinder {
028    
029        @NotNull
030        private final ClassPath classPath;
031    
032        public CliVirtualFileFinder(@NotNull ClassPath path) {
033            classPath = path;
034        }
035    
036        @Nullable
037        @Override
038        public VirtualFile find(@NotNull FqName className) {
039            for (VirtualFile root : classPath) {
040                VirtualFile fileInRoot = findFileInRoot(className.asString(), root);
041                if (fileInRoot != null) {
042                    return fileInRoot;
043                }
044            }
045            return null;
046        }
047    
048        //NOTE: copied with some changes from CoreJavaFileManager
049        @Nullable
050        private static VirtualFile findFileInRoot(@NotNull String qName, @NotNull VirtualFile root) {
051            String pathRest = qName;
052            VirtualFile cur = root;
053    
054            while (true) {
055                int dot = pathRest.indexOf('.');
056                if (dot < 0) break;
057    
058                String pathComponent = pathRest.substring(0, dot);
059                VirtualFile child = cur.findChild(pathComponent);
060    
061                if (child == null) break;
062                pathRest = pathRest.substring(dot + 1);
063                cur = child;
064            }
065    
066            String className = pathRest.replace('.', '$');
067            VirtualFile vFile = cur.findChild(className + ".class");
068            if (vFile != null) {
069                if (!vFile.isValid()) {
070                    //TODO: log
071                    return null;
072                }
073                //NOTE: currently we use VirtualFileFinder to find Kotlin binaries only
074                if (KotlinClassHeader.read(new VirtualFileKotlinClass(vFile)) != null) {
075                    return vFile;
076                }
077            }
078            return null;
079        }
080    }