org.grails.cli.interactive.completers.ClassNameCompleter.groovy Maven / Gradle / Ivy

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/*
 * Copyright 2014 original authors
 *
 * 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.grails.cli.interactive.completers

import groovy.transform.CompileStatic
import org.grails.io.support.PathMatchingResourcePatternResolver
import org.grails.io.support.Resource

import java.util.concurrent.ConcurrentLinkedQueue
import java.util.concurrent.ConcurrentSkipListSet


/**
 * A completer that completes class names
 *
 * @author Graeme Rocher
 * @since 3.0
 */
@CompileStatic
class ClassNameCompleter extends StringsCompleter {

        private static Map> RESOURCE_SCAN_CACHE = [:]
        private static Collection allCompeters = new ConcurrentLinkedQueue<>()
        PathMatchingResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver()

        private File[] baseDirs

        ClassNameCompleter(File baseDir) {
                initialize(baseDir)
        }

        ClassNameCompleter(File... baseDirs) {
                initialize(baseDirs)
        }

        static void refreshAll() {
                Thread.start {
                        RESOURCE_SCAN_CACHE.clear()
                        Collection competers = new ArrayList<>(allCompeters)
                        for (ClassNameCompleter completer : competers) {
                                completer.refresh()
                        }
                }
        }

        private void refresh() {
                if(!baseDirs) return
                initialize(baseDirs)
        }

        private void initialize(File... baseDirs) {
                try {
                        if(!baseDirs) return
                        this.baseDirs = baseDirs
                        if(!allCompeters.contains(this))
                                allCompeters << this
                        SortedSet allStrings = new ConcurrentSkipListSet<>()
                        for(File baseDir in baseDirs) {
                                def pattern = "file:${baseDir}/**/*.groovy".toString()
                                SortedSet strings = RESOURCE_SCAN_CACHE[pattern]
                                if(strings == null) {
                                        strings = new TreeSet<>()
                                        RESOURCE_SCAN_CACHE[pattern] = strings
                                        def resources = resourcePatternResolver.getResources(pattern)
                                        for (res in resources) {
                                                if(isValidResource(res)) {
                                                        def path = res.file.canonicalPath
                                                        def basePath = baseDir.canonicalPath
                                                        path = (path - basePath)[1..-8]
                                                        path = path.replace(File.separatorChar, '.' as char)
                                                        strings << path
                                                }
                                        }
                                }
                                allStrings.addAll(strings)
                        }
                        setStrings(allStrings)
                } catch (Throwable e) {
                        // ignore
                }
        }

        boolean isValidResource(Resource resource) {
                true
        }
}