使用svnkit获取文件的先前修改版本 [英] Get previous modified revision of a file using svnkit

问题描述

我正在使用SVN工具包从SVN存储库中收集一些指标.我陷入了这个简单的问题，无法解决它.

I am using SVN kit to gather some metrics from SVN repositories. I am stuck with this simple problem and am unable to get through it.

我有一个SVNRepository对象，该对象为我提供了存储库中所有文件及其不同修订版的路径.我想为每个修订设置先前的修订值. 如何在不检出该文件的情况下执行此操作?或者更确切地说，什么是从我的代码获得最佳性能的最佳方法是什么?

I have an SVNRepository object that give me paths of all files in the repository and their different revisions. I want to set previous revision value for each of the revision. How can I do that without checking out that file? Or rather what is the best way to do it so as to have best performance from my code?

在分配以前的修订版时，它还应该考虑复制/粘贴和移动活动.

It should also consider the copy/paste and move activity when allotting the previous revision.

推荐答案

以下技术对我有效.

//This is where I query SVN server
if (entryPath.getType() != SVNLogEntryPath.TYPE_ADDED) {
    LogEntryPreviousRevFinder handler = new LogEntryPreviousRevFinder(workingFileName.substring(interestingPath.length()), thisRevision);

    //Start checking for previous modified revision for this file in the previous 3 revision.
    //If not found try for previous 5 and then 7. If not found till then, put in a warning and continue.
    //This is necessary because in SVN a branch operation is performed at the folder level and not file 
    //hence we need to go further back and find out the revision than was last modified.
    for (int i = 3; i <= 7; i+=2) {
        repository.log(new String[] {workingFileName}, thisRevision, 0l, true, false, i, handler);
        if (handler.isSuccess()) {
            prevPath = handler.getPreviousPath();
            prevRevision = handler.getPreviousRevision();
            break;
        } else {
            continue;
        }
    }

    if (!handler.isSuccess()) {
        log.warn("Failed to find previous revision for file: " + workingFileName 
                + " Will contine considering this one as added in this revision");
    }
} else {
    //Files with SVNLogEntryPath.TYPE_ADDED are either added in this revision
    //or are copied or renamed from an existing file. If later, we need to identify the Copy from path
    //as that will be the file which will be used for calculating relative metrics and later Flux values
    if (entryPath.getCopyPath() != null && entryPath.getCopyPath().trim().length() > 0) {
        prevPath = entryPath.getCopyPath();
        prevRevision = entryPath.getCopyRevision();
    } else {
        log.debug("File: " + workingFileName + " added in this revision");
    }
}

ISVNLogEntryHandler实现:

ISVNLogEntryHandler implementation:

//ISVNLogEntryHandler implementation for identifying previous revision
private class LogEntryPreviousRevFinder implements ISVNLogEntryHandler {
    private String interestingFile;
    private String previousPath;
    private long thisRevision;
    private long previousRevision;
    private boolean isSuccess;

    public LogEntryPreviousRevFinder(String interestingFile, long revision) {
        this.interestingFile = interestingFile;
        this.thisRevision = revision;
        isSuccess = false;
    }

    @Override
    public void handleLogEntry(SVNLogEntry logEntry) throws SVNException {
        if (isSuccess)
            return;

        if (thisRevision == logEntry.getRevision())
            return;

        Set changedPathsSet = logEntry.getChangedPaths().keySet();
        for (Iterator changedPaths = changedPathsSet.iterator(); changedPaths.hasNext();) {
            SVNLogEntryPath entryPath = (SVNLogEntryPath) logEntry.getChangedPaths().get(changedPaths.next());
            String workingFileName = entryPath.getPath();

            if (workingFileName.endsWith(interestingFile)) {
                previousRevision = logEntry.getRevision();
                previousPath = workingFileName;
                isSuccess = true;
            }
        }
    }

    public long getPreviousRevision() {
        return previousRevision;
    }
    public String getPreviousPath() {
        return previousPath;
    }
    public boolean isSuccess() {
        return isSuccess;
    }
}

我想知道是否有更好，更有效的方法来做到这一点.

I wonder if there is a better and more efficient way to do this.

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