de.flapdoodle.java2pandoc.io.MavenSourceFileResolver.java Source code

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Here is the source code for de.flapdoodle.java2pandoc.io.MavenSourceFileResolver.java

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/**
 * Copyright (C) 2013
 *   Michael Mosmann <michael@mosmann.de>
 *
 * with contributions from
 *    -
 *
 * 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 de.flapdoodle.java2pandoc.io;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;

import com.google.common.base.Charsets;
import com.google.common.base.Optional;
import com.google.common.collect.Lists;

import de.flapdoodle.java2pandoc.block.Block;
import de.flapdoodle.java2pandoc.reference.FileReference;

public class MavenSourceFileResolver implements IReferenceResolver<FileReference> {

    private final Path _baseDirectory;
    private final List<Path> _searchPaths = Lists.newArrayList(Paths.get("src", "main", "java"),
            Paths.get("src", "main", "resources"), Paths.get("src", "test", "java"),
            Paths.get("src", "test", "resources"));

    public MavenSourceFileResolver(Path baseDirectory) {
        _baseDirectory = baseDirectory;
    }

    @Override
    public Optional<Block> resolve(FileReference reference) {
        Optional<Block> ret = Optional.absent();

        for (Path searchPath : _searchPaths) {
            Path javaSourcePaths = _baseDirectory.resolve(searchPath).resolve(reference.path());
            if (Files.exists(javaSourcePaths)) {
                if (ret.isPresent()) {
                    throw new IllegalArgumentException(
                            "Found " + reference + " in multiple paths(" + _searchPaths + ")");
                }
                ret = read(javaSourcePaths);
            }
        }

        return ret;
    }

    private Optional<Block> read(Path javaSourcePaths) {
        try {
            return Optional.of(new Block(Files.readAllLines(javaSourcePaths, Charsets.UTF_8)));
        } catch (IOException e) {
            return Optional.absent();
        }
    }
}