org.spearce.jgit/src/org/spearce/jgit/pgm/TextBuiltin.java

   1 /*
   2  * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
   3  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
   4  *
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or
   8  * without modification, are permitted provided that the following
   9  * conditions are met:
  10  *
  11  * - Redistributions of source code must retain the above copyright
  12  *   notice, this list of conditions and the following disclaimer.
  13  *
  14  * - Redistributions in binary form must reproduce the above
  15  *   copyright notice, this list of conditions and the following
  16  *   disclaimer in the documentation and/or other materials provided
  17  *   with the distribution.
  18  *
  19  * - Neither the name of the Git Development Community nor the
  20  *   names of its contributors may be used to endorse or promote
  21  *   products derived from this software without specific prior
  22  *   written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  25  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  26  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  29  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  31  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  32  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  33  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  34  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  36  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 package org.spearce.jgit.pgm;
  40
  41 import java.io.BufferedWriter;
  42 import java.io.IOException;
  43 import java.io.OutputStreamWriter;
  44 import java.io.PrintWriter;
  45
  46 import org.spearce.jgit.lib.Constants;
  47 import org.spearce.jgit.lib.ObjectId;
  48 import org.spearce.jgit.lib.Repository;
  49
  50 abstract class TextBuiltin {
  51         protected static final String REFS_HEADS = Constants.HEADS_PREFIX + "/";
  52
  53         protected static final String REFS_REMOTES = Constants.REMOTES_PREFIX + "/";
  54
  55         protected static final String REFS_TAGS = Constants.TAGS_PREFIX + "/";
  56
  57         protected PrintWriter out;
  58
  59         protected Repository db;
  60
  61         TextBuiltin() {
  62                 try {
  63                         out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
  64                                         System.out, "UTF-8")));
  65                 } catch (IOException e) {
  66                         throw die("cannot create output stream");
  67                 }
  68         }
  69
  70         abstract void execute(String[] args) throws Exception;
  71
  72         protected ObjectId resolve(final String s) throws IOException {
  73                 final ObjectId r = db.resolve(s);
  74                 if (r == null)
  75                         throw die("Not a revision: " + s);
  76                 return r;
  77         }
  78
  79         protected static Die die(final String why) {
  80                 return new Die(why);
  81         }
  82
  83         protected static String abbreviateObject(final ObjectId id) {
  84                 return id.toString().substring(0, 7);
  85         }
  86
  87         protected String abbreviateRef(String dst, boolean abbreviateRemote) {
  88                 if (dst.startsWith(REFS_HEADS))
  89                         dst = dst.substring(REFS_HEADS.length());
  90                 else if (dst.startsWith(REFS_TAGS))
  91                         dst = dst.substring(REFS_TAGS.length());
  92                 else if (abbreviateRemote && dst.startsWith(REFS_REMOTES))
  93                         dst = dst.substring(REFS_REMOTES.length());
  94                 return dst;
  95         }
  96 }