com.facebook.buck.jvm.java.autodeps.SymbolExtractor.java Source code

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Here is the source code for com.facebook.buck.jvm.java.autodeps.SymbolExtractor.java

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/*
 * Copyright 2016-present Facebook, Inc.
 *
 * 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 com.facebook.buck.jvm.java.autodeps;

import com.facebook.buck.jvm.java.JavaFileParser;
import com.google.common.base.Charsets;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.io.Files;

import java.io.IOException;
import java.nio.file.Path;
import java.util.HashSet;
import java.util.Set;

final class SymbolExtractor {

    private SymbolExtractor() {
    }

    public static Symbols extractSymbols(JavaFileParser javaFileParser, boolean shouldRecordRequiredSymbols,
            ImmutableSortedSet<Path> absolutePaths) {
        Set<String> providedSymbols = new HashSet<>();
        Set<String> requiredSymbols = new HashSet<>();
        Set<String> exportedSymbols = new HashSet<>();

        for (Path src : absolutePaths) {
            String code;
            try {
                code = Files.toString(src.toFile(), Charsets.UTF_8);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }

            JavaFileParser.JavaFileFeatures features = javaFileParser.extractFeaturesFromJavaCode(code);
            if (shouldRecordRequiredSymbols) {
                requiredSymbols.addAll(features.requiredSymbols);
                exportedSymbols.addAll(features.exportedSymbols);
            }

            providedSymbols.addAll(features.providedSymbols);
        }

        return new Symbols(providedSymbols,
                FluentIterable.from(requiredSymbols).filter(SymbolExtractor::isNotABuiltInSymbol),
                FluentIterable.from(exportedSymbols).filter(SymbolExtractor::isNotABuiltInSymbol));
    }

    private static boolean isNotABuiltInSymbol(String symbol) {
        // We can ignore things in java.*, but not javax.*, unfortunately since sometimes those are
        // provided by JSRs.
        return !symbol.startsWith("java.");
    }
}