org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/opt/AbstractTreeIteratorHandler.java

   1 /*
   2  * Copyright (C) 2008-2009, Google Inc.
   3  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
   4  * and other copyright owners as documented in the project's IP log.
   5  *
   6  * This program and the accompanying materials are made available
   7  * under the terms of the Eclipse Distribution License v1.0 which
   8  * accompanies this distribution, is reproduced below, and is
   9  * available at http://www.eclipse.org/org/documents/edl-v10.php
  10  *
  11  * All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or
  14  * without modification, are permitted provided that the following
  15  * conditions are met:
  16  *
  17  * - Redistributions of source code must retain the above copyright
  18  *   notice, this list of conditions and the following disclaimer.
  19  *
  20  * - Redistributions in binary form must reproduce the above
  21  *   copyright notice, this list of conditions and the following
  22  *   disclaimer in the documentation and/or other materials provided
  23  *   with the distribution.
  24  *
  25  * - Neither the name of the Eclipse Foundation, Inc. nor the
  26  *   names of its contributors may be used to endorse or promote
  27  *   products derived from this software without specific prior
  28  *   written permission.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  31  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  32  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  33  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  34  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  35  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  36  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  37  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  38  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  39  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  41  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  42  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  43  */
  44
  45 package org.eclipse.jgit.pgm.opt;
  46
  47 import java.io.File;
  48 import java.io.IOException;
  49 import java.text.MessageFormat;
  50
  51 import org.kohsuke.args4j.CmdLineException;
  52 import org.kohsuke.args4j.CmdLineParser;
  53 import org.kohsuke.args4j.OptionDef;
  54 import org.kohsuke.args4j.spi.OptionHandler;
  55 import org.kohsuke.args4j.spi.Parameters;
  56 import org.kohsuke.args4j.spi.Setter;
  57 import org.eclipse.jgit.dircache.DirCache;
  58 import org.eclipse.jgit.dircache.DirCacheIterator;
  59 import org.eclipse.jgit.errors.IncorrectObjectTypeException;
  60 import org.eclipse.jgit.errors.MissingObjectException;
  61 import org.eclipse.jgit.lib.ObjectId;
  62 import org.eclipse.jgit.lib.ObjectReader;
  63 import org.eclipse.jgit.pgm.CLIText;
  64 import org.eclipse.jgit.treewalk.AbstractTreeIterator;
  65 import org.eclipse.jgit.treewalk.CanonicalTreeParser;
  66 import org.eclipse.jgit.treewalk.FileTreeIterator;
  67 import org.eclipse.jgit.util.FS;
  68
  69 /**
  70  * Custom argument handler {@link AbstractTreeIterator} from string values.
  71  * <p>
  72  * Assumes the parser has been initialized with a Repository.
  73  */
  74 public class AbstractTreeIteratorHandler extends
  75                 OptionHandler<AbstractTreeIterator> {
  76         private final org.eclipse.jgit.pgm.opt.CmdLineParser clp;
  77
  78         /**
  79          * Create a new handler for the command name.
  80          * <p>
  81          * This constructor is used only by args4j.
  82          *
  83          * @param parser
  84          * @param option
  85          * @param setter
  86          */
  87         public AbstractTreeIteratorHandler(final CmdLineParser parser,
  88                         final OptionDef option,
  89                         final Setter<? super AbstractTreeIterator> setter) {
  90                 super(parser, option, setter);
  91                 clp = (org.eclipse.jgit.pgm.opt.CmdLineParser) parser;
  92         }
  93
  94         @Override
  95         public int parseArguments(final Parameters params) throws CmdLineException {
  96                 final String name = params.getParameter(0);
  97
  98                 if (new File(name).isDirectory()) {
  99                         setter.addValue(new FileTreeIterator(new File(name), FS.DETECTED));
 100                         return 1;
 101                 }
 102
 103                 if (new File(name).isFile()) {
 104                         final DirCache dirc;
 105                         try {
 106                                 dirc = DirCache.read(new File(name), FS.DETECTED);
 107                         } catch (IOException e) {
 108                                 throw new CmdLineException(MessageFormat.format(CLIText.get().notAnIndexFile, name), e);
 109                         }
 110                         setter.addValue(new DirCacheIterator(dirc));
 111                         return 1;
 112                 }
 113
 114                 final ObjectId id;
 115                 try {
 116                         id = clp.getRepository().resolve(name);
 117                 } catch (IOException e) {
 118                         throw new CmdLineException(e.getMessage());
 119                 }
 120                 if (id == null)
 121                         throw new CmdLineException(MessageFormat.format(CLIText.get().notATree, name));
 122
 123                 final CanonicalTreeParser p = new CanonicalTreeParser();
 124                 final ObjectReader curs = clp.getRepository().newObjectReader();
 125                 try {
 126                         p.reset(curs, clp.getRevWalk().parseTree(id));
 127                 } catch (MissingObjectException e) {
 128                         throw new CmdLineException(MessageFormat.format(CLIText.get().notATree, name));
 129                 } catch (IncorrectObjectTypeException e) {
 130                         throw new CmdLineException(MessageFormat.format(CLIText.get().notATree, name));
 131                 } catch (IOException e) {
 132                         throw new CmdLineException(MessageFormat.format(CLIText.get().cannotReadBecause, name, e.getMessage()));
 133                 } finally {
 134                         curs.release();
 135                 }
 136
 137                 setter.addValue(p);
 138                 return 1;
 139         }
 140
 141         @Override
 142         public String getDefaultMetaVariable() {
 143                 return CLIText.get().metaVar_treeish;
 144         }
 145 }