org.spearce.jgit.pgm/src/org/spearce/jgit/pgm/opt/RevTreeHandler.java

   1 /*
   2  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
   3  *
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or
   7  * without modification, are permitted provided that the following
   8  * conditions are met:
   9  *
  10  * - Redistributions of source code must retain the above copyright
  11  *   notice, this list of conditions and the following disclaimer.
  12  *
  13  * - Redistributions in binary form must reproduce the above
  14  *   copyright notice, this list of conditions and the following
  15  *   disclaimer in the documentation and/or other materials provided
  16  *   with the distribution.
  17  *
  18  * - Neither the name of the Git Development Community nor the
  19  *   names of its contributors may be used to endorse or promote
  20  *   products derived from this software without specific prior
  21  *   written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  24  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  25  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  28  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  31  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  32  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  33  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  35  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 package org.spearce.jgit.pgm.opt;
  39
  40 import java.io.IOException;
  41
  42 import org.kohsuke.args4j.CmdLineException;
  43 import org.kohsuke.args4j.CmdLineParser;
  44 import org.kohsuke.args4j.OptionDef;
  45 import org.kohsuke.args4j.spi.OptionHandler;
  46 import org.kohsuke.args4j.spi.Parameters;
  47 import org.kohsuke.args4j.spi.Setter;
  48 import org.spearce.jgit.errors.IncorrectObjectTypeException;
  49 import org.spearce.jgit.errors.MissingObjectException;
  50 import org.spearce.jgit.lib.ObjectId;
  51 import org.spearce.jgit.revwalk.RevTree;
  52
  53 /**
  54  * Custom argument handler {@link RevTree} from string values.
  55  * <p>
  56  * Assumes the parser has been initialized with a Repository.
  57  */
  58 public class RevTreeHandler extends OptionHandler<RevTree> {
  59         private final org.spearce.jgit.pgm.opt.CmdLineParser clp;
  60
  61         /**
  62          * Create a new handler for the command name.
  63          * <p>
  64          * This constructor is used only by args4j.
  65          *
  66          * @param parser
  67          * @param option
  68          * @param setter
  69          */
  70         public RevTreeHandler(final CmdLineParser parser, final OptionDef option,
  71                         final Setter<? super RevTree> setter) {
  72                 super(parser, option, setter);
  73                 clp = (org.spearce.jgit.pgm.opt.CmdLineParser) parser;
  74         }
  75
  76         @Override
  77         public int parseArguments(final Parameters params) throws CmdLineException {
  78                 final String name = params.getParameter(0);
  79                 final ObjectId id;
  80                 try {
  81                         id = clp.getRepository().resolve(name);
  82                 } catch (IOException e) {
  83                         throw new CmdLineException(e.getMessage());
  84                 }
  85                 if (id == null)
  86                         throw new CmdLineException(name + " is not a tree");
  87
  88                 final RevTree c;
  89                 try {
  90                         c = clp.getRevWalk().parseTree(id);
  91                 } catch (ClassCastException e) {
  92                         throw new CmdLineException(name + " is not a tree");
  93                 } catch (MissingObjectException e) {
  94                         throw new CmdLineException(name + " is not a tree");
  95                 } catch (IncorrectObjectTypeException e) {
  96                         throw new CmdLineException(name + " is not a tree");
  97                 } catch (IOException e) {
  98                         throw new CmdLineException("cannot read " + name + ": "
  99                                         + e.getMessage());
 100                 }
 101                 setter.addValue(c);
 102                 return 1;
 103         }
 104
 105         @Override
 106         public String getDefaultMetaVariable() {
 107                 return "tree-ish";
 108         }
 109 }