plugins/cvs/cvs-plugin/src/com/intellij/cvsSupport2/cvsstatuses/CvsStatusProvider.java

/*
 * Copyright 2000-2009 JetBrains s.r.o.
 *
 * 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.intellij.cvsSupport2.cvsstatuses;

import com.intellij.cvsSupport2.CvsUtil;
import com.intellij.cvsSupport2.application.CvsEntriesManager;
import com.intellij.cvsSupport2.util.CvsVfsUtil;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.vcs.FileStatus;
import com.intellij.openapi.vfs.VirtualFile;
import org.jetbrains.annotations.NotNull;
import org.netbeans.lib.cvsclient.admin.Entry;

import java.util.Date;

/**
 * author: lesya
 */
public class CvsStatusProvider {
  private static final Logger LOG = Logger.getInstance("#com.intellij.cvsSupport2.cvsstatuses.CvsStatusProvider");

  private static long TIME_STAMP_EPSILON = 3000;

  private CvsStatusProvider() {}

  public static void changeTimeStampEpsilonTo(long epsilon) {
    LOG.assertTrue(ApplicationManager.getApplication().isUnitTestMode());
    TIME_STAMP_EPSILON = epsilon;
  }

  public static FileStatus getStatus(@NotNull VirtualFile file) {
    if (!CvsEntriesManager.getInstance().isActive()) return FileStatus.NOT_CHANGED;
    return getStatus(file, CvsEntriesManager.getInstance().getEntryFor(file.getParent(), file.getName()));
  }

  public static FileStatus getStatus(VirtualFile file, Entry entry) {
    if (file == null) {
      return getFileStatusForAbsentFile(entry);
    }

    if (entry == null) {
      return getFileStatusForAbsentEntry(file);
    }

    if (entry.isDirectory()) {
      return FileStatus.NOT_CHANGED;
    }

    if (entry.isAddedFile()) {
      return FileStatus.ADDED;
    }

    if (entry.isRemoved()) {
      return FileStatus.DELETED;
    }

    if (entry.isResultOfMerge()) {
      if (entry.isConflict()) {
        return FileStatus.MERGED_WITH_CONFLICTS;
      }
      else {
        return FileStatus.MERGE;
      }
    }

    Date revisionDate = entry.getLastModified();

    if (revisionDate == null) {
      return FileStatus.MODIFIED;
    }

    final long entryDate = revisionDate.getTime();
    final long fileDate = CvsVfsUtil.getTimeStamp(file);
    if (LOG.isDebugEnabled()) {
      LOG.debug("getStatus() for " + file.getPath() + ": entry date " + entryDate + ", file date " + fileDate);
    }
    return (timeStampsAreEqual(entryDate, fileDate)) ? FileStatus.NOT_CHANGED : FileStatus.MODIFIED;

  }

  private static FileStatus getFileStatusForAbsentFile(Entry entry) {
    if (entry == null || entry.isDirectory()) {
      return FileStatus.UNKNOWN;
    }
    if (entry.isRemoved()) {
      return FileStatus.DELETED;
    }
    return FileStatus.DELETED_FROM_FS;
  }

  private static FileStatus getFileStatusForAbsentEntry(VirtualFile file) {
    if (file == null) {
      return FileStatus.UNKNOWN;
    }

    if (CvsEntriesManager.getInstance().fileIsIgnored(file)) {
      return FileStatus.IGNORED;
    }

    if (file.isDirectory() && CvsUtil.fileIsUnderCvs(file)) {
      return FileStatus.NOT_CHANGED;
    }

    return FileStatus.UNKNOWN;
  }

  public static boolean timeStampsAreEqual(long revisionTime, long fileTimestamp) {
    long diff = Math.abs(revisionTime - fileTimestamp);
    return isZero(diff) || isZero(Math.abs(diff - 3600000));
  }

  private static boolean isZero(long diff) {
    return diff < TIME_STAMP_EPSILON;
  }

  public static Date createDateDiffersTo(long timeStamp) {
    return new Date(timeStamp - CvsStatusProvider.TIME_STAMP_EPSILON - 1);
  }

}