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    1   //========================================================================
    2   //Copyright 2007 Mort Bay Consulting Pty. Ltd.
    3   //------------------------------------------------------------------------
    4   //Licensed under the Apache License, Version 2.0 (the "License");
    5   //you may not use this file except in compliance with the License.
    6   //You may obtain a copy of the License at
    7   //http://www.apache.org/licenses/LICENSE-2.0
    8   //Unless required by applicable law or agreed to in writing, software
    9   //distributed under the License is distributed on an "AS IS" BASIS,
    10  //WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  //See the License for the specific language governing permissions and
    12  //limitations under the License.
    13  //========================================================================
    14
    15  package org.mortbay.resource;
    16
    17  import java.io.File;
    18  import java.io.IOException;
    19  import java.io.InputStream;
    20  import java.io.OutputStream;
    21  import java.net.MalformedURLException;
    22  import java.net.URL;
    23  import java.util.ArrayList;
    24  import java.util.HashSet;
    25  import java.util.StringTokenizer;
    26
    27  import org.mortbay.util.URIUtil;
    28
    29  /**
    30   * A collection of resources (dirs).
    31   * Allows webapps to have multiple (static) sources.
    32   * The first resource in the collection is the main resource.
    33   * If a resource is not found in the main resource, it looks it up in
    34   * the order the resources were constructed.
    35   *
    36   * @author dyu
    37   *
    38   */
    39  public class ResourceCollection extends Resource
    40  {
    41
    42      private Resource[] _resources;
    43
    44      public ResourceCollection()
    45      {
    46
    47      }
    48
    49      /* ------------------------------------------------------------ */
    50      public ResourceCollection(Resource[] resources)
    51      {
    52          setResources(resources);
    53      }
    54
    55      /* ------------------------------------------------------------ */
    56      public ResourceCollection(String[] resources)
    57      {
    58          setResources(resources);
    59      }
    60
    61      /* ------------------------------------------------------------ */
    62      public ResourceCollection(String csvResources)
    63      {
    64          setResources(csvResources);
    65      }
    66
    67      /* ------------------------------------------------------------ */
    68      /**
    69       *
    70       * @param resources Resource array
    71       */
    72      public void setResources(Resource[] resources)
    73      {
    74          if(_resources!=null)
    75              throw new IllegalStateException("*resources* already set.");
    76
    77          if(resources==null)
    78              throw new IllegalArgumentException("*resources* must not be null.");
    79
    80          if(resources.length==0)
    81              throw new IllegalArgumentException("arg *resources* must be one or more resources.");
    82
    83          _resources = resources;
    84          for(int i=0; i<_resources.length; i++)
    85          {
    86              Resource r = _resources[i];
    87              if(!r.exists() || !r.isDirectory())
    88                  throw new IllegalArgumentException(r + " is not an existing directory.");
    89          }
    90      }
    91
    92      /* ------------------------------------------------------------ */
    93      /**
    94       *
    95       * @param resources String array
    96       */
    97      public void setResources(String[] resources)
    98      {
    99          if(_resources!=null)
    100             throw new IllegalStateException("*resources* already set.");
    101
    102         if(resources==null)
    103             throw new IllegalArgumentException("*resources* must not be null.");
    104
    105         if(resources.length==0)
    106             throw new IllegalArgumentException("arg *resources* must be one or more resources.");
    107
    108         _resources = new Resource[resources.length];
    109         try
    110         {
    111             for(int i=0; i<resources.length; i++)
    112             {
    113                 _resources[i] = Resource.newResource(resources[i]);
    114                 if(!_resources[i].exists() || !_resources[i].isDirectory())
    115                     throw new IllegalArgumentException(_resources[i] + " is not an existing directory.");
    116             }
    117         }
    118         catch(Exception e)
    119         {
    120             throw new RuntimeException(e);
    121         }
    122     }
    123
    124     /* ------------------------------------------------------------ */
    125     /**
    126      *
    127      * @param csvResources Comma separated values
    128      */
    129     public void setResources(String csvResources)
    130     {
    131         if(_resources!=null)
    132             throw new IllegalStateException("*resources* already set.");
    133
    134         if(csvResources==null)
    135             throw new IllegalArgumentException("*csvResources* must not be null.");
    136
    137         StringTokenizer tokenizer = new StringTokenizer(csvResources, ",;");
    138         int len = tokenizer.countTokens();
    139         if(len==0)
    140             throw new IllegalArgumentException("arg *resources* must be one or more resources.");
    141
    142         _resources = new Resource[len];
    143         try
    144         {
    145             for(int i=0; tokenizer.hasMoreTokens(); i++)
    146             {
    147                 _resources[i] = Resource.newResource(tokenizer.nextToken().trim());
    148                 if(!_resources[i].exists() || !_resources[i].isDirectory())
    149                     throw new IllegalArgumentException(_resources[i] + " is not an existing directory.");
    150             }
    151         }
    152         catch(Exception e)
    153         {
    154             throw new RuntimeException(e);
    155         }
    156     }
    157
    158     /* ------------------------------------------------------------ */
    159     /**
    160      *
    161      * @param csvResources Comma separated values
    162      */
    163     public void setResourcesAsCSV(String csvResources)
    164     {
    165         setResources(csvResources);
    166     }
    167
    168     /* ------------------------------------------------------------ */
    169     /**
    170      *
    171      * @return the resource array
    172      */
    173     public Resource[] getResources()
    174     {
    175         return _resources;
    176     }
    177
    178     /* ------------------------------------------------------------ */
    179     /**
    180      * @param path The path segment to add
    181      * @return The contained resource (found first) in the collection of resources
    182      */
    183     public Resource addPath(String path) throws IOException, MalformedURLException
    184     {
    185         if(_resources==null)
    186             throw new IllegalStateException("*resources* not set.");
    187
    188         if(path==null)
    189             throw new MalformedURLException();
    190
    191         if(path.length()==0 || URIUtil.SLASH.equals(path))
    192             return this;
    193
    194         Resource resource=null;
    195         ArrayList resources = null;
    196         int i=0;
    197         for(; i<_resources.length; i++)
    198         {
    199             resource = _resources[i].addPath(path);
    200             if (resource.exists())
    201             {
    202                 if (resource.isDirectory())
    203                     break;
    204                 return resource;
    205             }
    206         }
    207
    208         for(i++; i<_resources.length; i++)
    209         {
    210             Resource r = _resources[i].addPath(path);
    211             if (r.exists() && r.isDirectory())
    212             {
    213                 if (resource!=null)
    214                 {
    215                     resources = new ArrayList();
    216                     resources.add(resource);
    217                     resource=null;
    218                 }
    219                 resources.add(r);
    220             }
    221         }
    222
    223         if (resource!=null)
    224             return resource;
    225         if (resources!=null)
    226             return new ResourceCollection((Resource[])resources.toArray(new Resource[resources.size()]));
    227         return null;
    228     }
    229
    230     /* ------------------------------------------------------------ */
    231     /**
    232      * @param path
    233      * @return the resource(file) if found, returns a list of resource dirs if its a dir, else null.
    234      * @throws IOException
    235      * @throws MalformedURLException
    236      */
    237     protected Object findResource(String path) throws IOException, MalformedURLException
    238     {
    239         Resource resource=null;
    240         ArrayList resources = null;
    241         int i=0;
    242         for(; i<_resources.length; i++)
    243         {
    244             resource = _resources[i].addPath(path);
    245             if (resource.exists())
    246             {
    247                 if (resource.isDirectory())
    248                     break;
    249
    250                 return resource;
    251             }
    252         }
    253
    254         for(i++; i<_resources.length; i++)
    255         {
    256             Resource r = _resources[i].addPath(path);
    257             if (r.exists() && r.isDirectory())
    258             {
    259                 if (resource!=null)
    260                 {
    261                     resources = new ArrayList();
    262                     resources.add(resource);
    263                 }
    264                 resources.add(r);
    265             }
    266         }
    267
    268         if (resource!=null)
    269             return resource;
    270         if (resources!=null)
    271             return resources;
    272         return null;
    273     }
    274
    275     /* ------------------------------------------------------------ */
    276     public boolean delete() throws SecurityException
    277     {
    278         throw new UnsupportedOperationException();
    279     }
    280
    281     /* ------------------------------------------------------------ */
    282     public boolean exists()
    283     {
    284         if(_resources==null)
    285             throw new IllegalStateException("*resources* not set.");
    286
    287         return true;
    288     }
    289
    290     /* ------------------------------------------------------------ */
    291     public File getFile() throws IOException
    292     {
    293         if(_resources==null)
    294             throw new IllegalStateException("*resources* not set.");
    295
    296         for(int i=0; i<_resources.length; i++)
    297         {
    298             File f = _resources[i].getFile();
    299             if(f!=null)
    300                 return f;
    301         }
    302         return null;
    303     }
    304
    305     /* ------------------------------------------------------------ */
    306     public InputStream getInputStream() throws IOException
    307     {
    308         if(_resources==null)
    309             throw new IllegalStateException("*resources* not set.");
    310
    311         for(int i=0; i<_resources.length; i++)
    312         {
    313             InputStream is = _resources[i].getInputStream();
    314             if(is!=null)
    315                 return is;
    316         }
    317         return null;
    318     }
    319
    320     /* ------------------------------------------------------------ */
    321     public String getName()
    322     {
    323         if(_resources==null)
    324             throw new IllegalStateException("*resources* not set.");
    325
    326         for(int i=0; i<_resources.length; i++)
    327         {
    328             String name = _resources[i].getName();
    329             if(name!=null)
    330                 return name;
    331         }
    332         return null;
    333     }
    334
    335     /* ------------------------------------------------------------ */
    336     public OutputStream getOutputStream() throws IOException, SecurityException
    337     {
    338         if(_resources==null)
    339             throw new IllegalStateException("*resources* not set.");
    340
    341         for(int i=0; i<_resources.length; i++)
    342         {
    343             OutputStream os = _resources[i].getOutputStream();
    344             if(os!=null)
    345                 return os;
    346         }
    347         return null;
    348     }
    349
    350     /* ------------------------------------------------------------ */
    351     public URL getURL()
    352     {
    353         if(_resources==null)
    354             throw new IllegalStateException("*resources* not set.");
    355
    356         for(int i=0; i<_resources.length; i++)
    357         {
    358             URL url = _resources[i].getURL();
    359             if(url!=null)
    360                 return url;
    361         }
    362         return null;
    363     }
    364
    365     /* ------------------------------------------------------------ */
    366     public boolean isDirectory()
    367     {
    368         if(_resources==null)
    369             throw new IllegalStateException("*resources* not set.");
    370
    371         return true;
    372     }
    373
    374     /* ------------------------------------------------------------ */
    375     public long lastModified()
    376     {
    377         if(_resources==null)
    378             throw new IllegalStateException("*resources* not set.");
    379
    380         for(int i=0; i<_resources.length; i++)
    381         {
    382             long lm = _resources[i].lastModified();
    383             if (lm!=-1)
    384                 return lm;
    385         }
    386         return -1;
    387     }
    388
    389     /* ------------------------------------------------------------ */
    390     public long length()
    391     {
    392         return -1;
    393     }
    394
    395     /* ------------------------------------------------------------ */
    396     /**
    397      * @return The list of resource names(merged) contained in the collection of resources.
    398      */
    399     public String[] list()
    400     {
    401         if(_resources==null)
    402             throw new IllegalStateException("*resources* not set.");
    403
    404         HashSet set = new HashSet();
    405         for(int i=0; i<_resources.length; i++)
    406         {
    407             String[] list = _resources[i].list();
    408             for(int j=0; j<list.length; j++)
    409                 set.add(list[j]);
    410         }
    411         return (String[])set.toArray(new String[set.size()]);
    412     }
    413
    414     /* ------------------------------------------------------------ */
    415     public void release()
    416     {
    417         if(_resources==null)
    418             throw new IllegalStateException("*resources* not set.");
    419
    420         for(int i=0; i<_resources.length; i++)
    421             _resources[i].release();
    422     }
    423
    424     /* ------------------------------------------------------------ */
    425     public boolean renameTo(Resource dest) throws SecurityException
    426     {
    427         throw new UnsupportedOperationException();
    428     }
    429
    430     /* ------------------------------------------------------------ */
    431     /**
    432      * @return the list of resources separated by a path separator
    433      */
    434     public String toString()
    435     {
    436         if(_resources==null)
    437             throw new IllegalStateException("*resources* not set.");
    438
    439         StringBuffer buffer = new StringBuffer();
    440         for(int i=0; i<_resources.length; i++)
    441             buffer.append(_resources[i].toString()).append(';');
    442         return buffer.toString();
    443     }
    444
    445 }