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ObjectosGit is a pure Java library that provides a limited set of GIT operations.
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/*
 * Copyright (C) 2020-2022 Objectos Software LTDA.
 *
 * 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 br.com.objectos.git;

import br.com.objectos.collections.list.ImmutableList;
import br.com.objectos.core.object.Checks;
import br.com.objectos.core.object.ToString;
import br.com.objectos.core.object.ToStringObject;
import br.com.objectos.fs.Directory;
import br.com.objectos.fs.RegularFile;
import br.com.objectos.fs.ResolvedPath;
import java.io.IOException;

/**
 * Represents a Git repository.
 *
 * @since 1
 */
public final class Repository extends GitRepository implements ToStringObject {

  private final Directory gitDirectory;

  private final Directory objectsDirectory;

  private final ImmutableList packFiles;

  Repository(Directory gitDirectory,
             Directory objectsDirectory,
             ImmutableList packFiles) {
    this.gitDirectory = gitDirectory;

    this.objectsDirectory = objectsDirectory;

    this.packFiles = packFiles;
  }

  @Override
  public final void formatToString(StringBuilder sb, int depth) {
    ToString.formatToString(
        sb, depth, this,
        "gitDirectory", gitDirectory,
        "packFiles", packFiles
    );
  }

  /**
   * Returns {@code true} if this repository is a bare repository.
   *
   * @return {@code true} if this repository is a bare repository
   */
  public boolean isBare() {
    return true;
  }

  @Override
  public final String toString() {
    return ToString.toString(this);
  }

  final RegularFile createRegularFile(ObjectId objectId) throws IOException {
    String directoryName;
    directoryName = objectId.getDirectoryName();

    ResolvedPath resolved;
    resolved = objectsDirectory.resolve(directoryName);

    Directory sub;
    sub = resolved.toDirectoryCreateIfNotFound();

    String regularFileName;
    regularFileName = objectId.getRegularFileName();

    return sub.createRegularFile(regularFileName);
  }

  final RegularFile getLooseObjectFile(ObjectId objectId) throws IOException {
    String directoryName;
    directoryName = objectId.getDirectoryName();

    Directory sub;
    sub = objectsDirectory.getDirectory(directoryName);

    String regularFileName;
    regularFileName = objectId.getRegularFileName();

    return sub.getRegularFile(regularFileName);
  }

  @Override
  final PackFile getPackFile(int index) {
    return packFiles.get(index);
  }

  @Override
  final int getPackFileCount() {
    return packFiles.size();
  }

  final ResolvedPath resolve(String first, String... more) {
    return objectsDirectory.resolve(first, more);
  }

  final ResolvedPath resolveLoose(RefName ref) throws IOException {
    return ref.resolveLoose(gitDirectory);
  }

  @Override
  final ResolvedPath resolveLooseObject(ObjectId objectId) throws IOException {
    String directoryName;
    directoryName = objectId.getDirectoryName();

    String regularFileName;
    regularFileName = objectId.getRegularFileName();

    return objectsDirectory.resolve(directoryName, regularFileName);
  }

  final ResolvedPath resolvePackedRefs() throws IOException {
    return gitDirectory.resolve("packed-refs");
  }

  final void update(RefName refName, ObjectId value) throws IOException {
    Checks.checkNotNull(refName, "refName == null");

    refName.update(gitDirectory, value);
  }

}