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// Copyright (C) 2020 The Android Open Source Project
//
// 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.google.gerrit.server.patch;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.entities.Patch;
import com.google.gerrit.entities.Patch.ChangeType;
import com.google.gerrit.entities.Project;
import com.google.gerrit.extensions.client.DiffPreferencesInfo;
import com.google.gerrit.server.patch.filediff.FileDiffOutput;
import java.util.Map;
import org.eclipse.jgit.lib.ObjectId;
/**
* An interface for all file diff related operations. Clients should use this interface to request:
*
* <ul>
* <li>The list of modified files between two commits.
* <li>The list of modified files between a commit and its parent or the auto-merge.
* <li>The detailed file diff for a single file path.
* <li>The Intra-line diffs for a single file path (TODO:ghareeb).
* </ul>
*/
public interface DiffOperations {
/**
* Returns the list of added, deleted or modified files between a commit against its base. The
* {@link Patch#COMMIT_MSG} and {@link Patch#MERGE_LIST} (for merge commits) are also returned.
*
* <p>If parentNum is set, it is used as the old commit in the diff. Otherwise, if the {@code
* newCommit} has only one parent, it is used as base. If {@code newCommit} has two parents, the
* auto-merge commit is computed and used as base. The auto-merge for more than two parents is not
* supported.
*
* @param project a project name representing a git repository.
* @param newCommit 20 bytes SHA-1 of the new commit used in the diff.
* @param parentNum 1-based integer specifying which parent to use as base. If zero, the only
* parent will be used or the auto-merge if {@code newCommit} is a merge commit.
* @return map of file paths to the file diffs. The map key is the new file path for all {@link
* ChangeType} file diffs except {@link ChangeType#DELETED} entries where the map key contains
* the old file path. The map entries are not sorted by key.
* @throws DiffNotAvailableException if auto-merge is requested for a commit having more than two
* parents, if the {@code newCommit} could not be parsed for extracting the base commit, or if
* an internal error occurred in Git while evaluating the diff.
*/
Map<String, FileDiffOutput> listModifiedFilesAgainstParent(
Project.NameKey project, ObjectId newCommit, int parentNum) throws DiffNotAvailableException;
/**
* Returns the list of added, deleted or modified files between two commits (patchsets). The
* commit message and merge list (for merge commits) are also returned.
*
* @param project a project name representing a git repository.
* @param oldCommit 20 bytes SHA-1 of the old commit used in the diff.
* @param newCommit 20 bytes SHA-1 of the new commit used in the diff.
* @return map of file paths to the file diffs. The map key is the new file path for all {@link
* ChangeType} file diffs except {@link ChangeType#DELETED} entries where the map key contains
* the old file path. The map entries are not sorted by key.
* @throws DiffNotAvailableException if an internal error occurred in Git while evaluating the
* diff.
*/
Map<String, FileDiffOutput> listModifiedFiles(
Project.NameKey project, ObjectId oldCommit, ObjectId newCommit)
throws DiffNotAvailableException;
/**
* Returns the diff for a single file between a patchset commit against its parent or the
* auto-merge commit. For deleted files, the {@code fileName} parameter should contain the old
* name of the file. This method will return {@link FileDiffOutput#empty(String, ObjectId,
* ObjectId)} if the requested file identified by {@code fileName} has unchanged content or does
* not exist at both commits.
*
* @param project a project name representing a git repository.
* @param newCommit 20 bytes SHA-1 of the new commit used in the diff.
* @param parentNum 1-based integer specifying which parent to use as base. If zero, the only
* parent will be used or the auto-merge if {@code newCommit} is a merge commit.
* @param fileName the file name for which the diff should be evaluated.
* @param whitespace preference controlling whitespace effect in diff computation.
* @return the diff for the single file between the two commits.
* @throws DiffNotAvailableException if an internal error occurred in Git while evaluating the
* diff, or if an exception happened while parsing the base commit.
*/
FileDiffOutput getModifiedFileAgainstParent(
Project.NameKey project,
ObjectId newCommit,
int parentNum,
String fileName,
@Nullable DiffPreferencesInfo.Whitespace whitespace)
throws DiffNotAvailableException;
/**
* Returns the diff for a single file between two patchset commits. For deleted files, the {@code
* fileName} parameter should contain the old name of the file. This method will return {@link
* FileDiffOutput#empty(String, ObjectId, ObjectId)} if the requested file identified by {@code
* fileName} has unchanged content or does not exist at both commits.
*
* @param project a project name representing a git repository.
* @param oldCommit 20 bytes SHA-1 of the old commit used in the diff.
* @param newCommit 20 bytes SHA-1 of the new commit used in the diff.
* @param fileName the file name for which the diff should be evaluated.
* @param whitespace preference controlling whitespace effect in diff computation.
* @return the diff for the single file between the two commits.
* @throws DiffNotAvailableException if an internal error occurred in Git while evaluating the
* diff.
*/
FileDiffOutput getModifiedFile(
Project.NameKey project,
ObjectId oldCommit,
ObjectId newCommit,
String fileName,
@Nullable DiffPreferencesInfo.Whitespace whitespace)
throws DiffNotAvailableException;
}
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