src/main/java/net/pterodactylus/sone/fcp/AbstractSoneCommand.java

   1 /*
   2  * Sone - FcpInterface.java - Copyright © 2011 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.sone.fcp;
  19
  20 import java.util.Collection;
  21 import java.util.List;
  22
  23 import net.pterodactylus.sone.core.Core;
  24 import net.pterodactylus.sone.data.Post;
  25 import net.pterodactylus.sone.data.Reply;
  26 import net.pterodactylus.sone.data.Sone;
  27 import net.pterodactylus.sone.freenet.SimpleFieldSetBuilder;
  28 import net.pterodactylus.sone.freenet.fcp.AbstractCommand;
  29 import net.pterodactylus.sone.freenet.fcp.Command;
  30 import net.pterodactylus.sone.freenet.fcp.FcpException;
  31 import net.pterodactylus.sone.template.SoneAccessor;
  32 import net.pterodactylus.util.filter.Filters;
  33 import freenet.node.FSParseException;
  34 import freenet.support.SimpleFieldSet;
  35
  36 /**
  37  * Abstract base implementation of a {@link Command} with Sone-related helper
  38  * methods.
  39  *
  40  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  41  */
  42 public abstract class AbstractSoneCommand extends AbstractCommand {
  43
  44         /** The Sone core. */
  45         private final Core core;
  46
  47         /** Whether this command needs write access. */
  48         private final boolean writeAccess;
  49
  50         /**
  51          * Creates a new abstract Sone FCP command.
  52          *
  53          * @param core
  54          *            The Sone core
  55          */
  56         protected AbstractSoneCommand(Core core) {
  57                 this(core, false);
  58         }
  59
  60         /**
  61          * Creates a new abstract Sone FCP command.
  62          *
  63          * @param core
  64          *            The Sone core
  65          * @param writeAccess
  66          *            {@code true} if this command requires write access,
  67          *            {@code false} otherwise
  68          */
  69         protected AbstractSoneCommand(Core core, boolean writeAccess) {
  70                 this.core = core;
  71                 this.writeAccess = writeAccess;
  72         }
  73
  74         //
  75         // ACCESSORS
  76         //
  77
  78         /**
  79          * Returns the Sone core.
  80          *
  81          * @return The Sone core
  82          */
  83         protected Core getCore() {
  84                 return core;
  85         }
  86
  87         /**
  88          * Returns whether this command requires write access.
  89          *
  90          * @return {@code true} if this command require write access, {@code false}
  91          *         otherwise
  92          */
  93         public boolean requiresWriteAccess() {
  94                 return writeAccess;
  95         }
  96
  97         //
  98         // PROTECTED METHODS
  99         //
 100
 101         /**
 102          * Encodes text in a way that makes it possible for the text to be stored in
 103          * a {@link SimpleFieldSet}. Backslashes, CR, and LF are prepended with a
 104          * backslash.
 105          *
 106          * @param text
 107          *            The text to encode
 108          * @return The encoded text
 109          */
 110         protected String encodeString(String text) {
 111                 return text.replaceAll("\\\\", "\\\\").replaceAll("\n", "\\\\n").replaceAll("\r", "\\\\r");
 112         }
 113
 114         /**
 115          * Returns a Sone whose ID is a parameter in the given simple field set.
 116          *
 117          * @param simpleFieldSet
 118          *            The simple field set containing the ID of the Sone
 119          * @param parameterName
 120          *            The name under which the Sone ID is stored in the simple field
 121          *            set
 122          * @param localOnly
 123          *            {@code true} to only return local Sones, {@code false} to
 124          *            return any Sones
 125          * @return The Sone
 126          * @throws FcpException
 127          *             if there is no Sone ID stored under the given parameter name,
 128          *             or if the Sone ID is invalid
 129          */
 130         protected Sone getSone(SimpleFieldSet simpleFieldSet, String parameterName, boolean localOnly) throws FcpException {
 131                 try {
 132                         String soneId = simpleFieldSet.getString(parameterName);
 133                         Sone sone = localOnly ? core.getLocalSone(soneId, false) : core.getSone(soneId, false);
 134                         if (sone == null) {
 135                                 throw new FcpException("Could not load Sone from “" + soneId + "”.");
 136                         }
 137                         return sone;
 138                 } catch (FSParseException fspe1) {
 139                         throw new FcpException("Could not load Sone ID from “" + parameterName + "”.", fspe1);
 140                 }
 141         }
 142
 143         /**
 144          * Returns a post whose ID is a parameter in the given simple field set.
 145          *
 146          * @param simpleFieldSet
 147          *            The simple field set containing the ID of the post
 148          * @param parameterName
 149          *            The name under which the post ID is stored in the simple field
 150          *            set
 151          * @return The post
 152          * @throws FcpException
 153          *             if there is no post ID stored under the given parameter name,
 154          *             or if the post ID is invalid
 155          */
 156         protected Post getPost(SimpleFieldSet simpleFieldSet, String parameterName) throws FcpException {
 157                 try {
 158                         String postId = simpleFieldSet.getString(parameterName);
 159                         Post post = core.getPost(postId, false);
 160                         if (post == null) {
 161                                 throw new FcpException("Could not load post from “" + postId + "”.");
 162                         }
 163                         return post;
 164                 } catch (FSParseException fspe1) {
 165                         throw new FcpException("Could not post ID from “" + parameterName + "”.", fspe1);
 166                 }
 167         }
 168
 169         /**
 170          * Returns a reply whose ID is a parameter in the given simple field set.
 171          *
 172          * @param simpleFieldSet
 173          *            The simple field set containing the ID of the reply
 174          * @param parameterName
 175          *            The name under which the reply ID is stored in the simple
 176          *            field set
 177          * @return The reply
 178          * @throws FcpException
 179          *             if there is no reply ID stored under the given parameter
 180          *             name, or if the reply ID is invalid
 181          */
 182         protected Reply getReply(SimpleFieldSet simpleFieldSet, String parameterName) throws FcpException {
 183                 try {
 184                         String replyId = simpleFieldSet.getString(parameterName);
 185                         Reply reply = core.getReply(replyId, false);
 186                         if (reply == null) {
 187                                 throw new FcpException("Could not load reply from “" + replyId + "”.");
 188                         }
 189                         return reply;
 190                 } catch (FSParseException fspe1) {
 191                         throw new FcpException("Could not reply ID from “" + parameterName + "”.", fspe1);
 192                 }
 193         }
 194
 195         /**
 196          * Creates a simple field set from the given collection of Sones.
 197          *
 198          * @param sones
 199          *            The Sones to encode
 200          * @param prefix
 201          *            The prefix for the field names (may be empty but not
 202          *            {@code null})
 203          * @return The simple field set containing the given Sones
 204          */
 205         protected SimpleFieldSet encodeSones(Collection<? extends Sone> sones, String prefix) {
 206                 SimpleFieldSetBuilder soneBuilder = new SimpleFieldSetBuilder();
 207
 208                 int soneIndex = 0;
 209                 soneBuilder.put(prefix + "Count", sones.size());
 210                 for (Sone sone : sones) {
 211                         String sonePrefix = prefix + soneIndex++ + ".";
 212                         soneBuilder.put(sonePrefix + "ID", sone.getId());
 213                         soneBuilder.put(sonePrefix + "Name", sone.getName());
 214                         soneBuilder.put(sonePrefix + "NiceName", SoneAccessor.getNiceName(sone));
 215                         soneBuilder.put(sonePrefix + "Time", sone.getTime());
 216                 }
 217
 218                 return soneBuilder.get();
 219         }
 220
 221         /**
 222          * Creates a simple field set from the given post.
 223          *
 224          * @param post
 225          *            The post to encode
 226          * @param prefix
 227          *            The prefix for the field names (may be empty but not
 228          *            {@code null})
 229          * @param includeReplies
 230          *            {@code true} to include replies, {@code false} to not include
 231          *            replies
 232          * @return The simple field set containing the post
 233          */
 234         protected SimpleFieldSet encodePost(Post post, String prefix, boolean includeReplies) {
 235                 SimpleFieldSetBuilder postBuilder = new SimpleFieldSetBuilder();
 236
 237                 postBuilder.put(prefix + "ID", post.getId());
 238                 postBuilder.put(prefix + "Sone", post.getSone().getId());
 239                 if (post.getRecipient() != null) {
 240                         postBuilder.put(prefix + "Recipient", post.getRecipient().getId());
 241                 }
 242                 postBuilder.put(prefix + "Time", post.getTime());
 243                 postBuilder.put(prefix + "Text", encodeString(post.getText()));
 244                 postBuilder.put(encodeLikes(core.getLikes(post), prefix + "Likes."));
 245
 246                 if (includeReplies) {
 247                         List<Reply> replies = core.getReplies(post);
 248                         postBuilder.put(encodeReplies(replies, prefix));
 249                 }
 250
 251                 return postBuilder.get();
 252         }
 253
 254         /**
 255          * Creates a simple field set from the given collection of posts.
 256          *
 257          * @param posts
 258          *            The posts to encode
 259          * @param prefix
 260          *            The prefix for the field names (may be empty but not
 261          *            {@code null})
 262          * @param includeReplies
 263          *            {@code true} to include the replies, {@code false} to not
 264          *            include the replies
 265          * @return The simple field set containing the posts
 266          */
 267         protected SimpleFieldSet encodePosts(Collection<? extends Post> posts, String prefix, boolean includeReplies) {
 268                 SimpleFieldSetBuilder postBuilder = new SimpleFieldSetBuilder();
 269
 270                 int postIndex = 0;
 271                 postBuilder.put(prefix + "Count", posts.size());
 272                 for (Post post : posts) {
 273                         String postPrefix = prefix + postIndex++;
 274                         postBuilder.put(encodePost(post, postPrefix + ".", includeReplies));
 275                         if (includeReplies) {
 276                                 postBuilder.put(encodeReplies(Filters.filteredList(core.getReplies(post), Reply.FUTURE_REPLIES_FILTER), postPrefix + "."));
 277                         }
 278                 }
 279
 280                 return postBuilder.get();
 281         }
 282
 283         /**
 284          * Creates a simple field set from the given collection of replies.
 285          *
 286          * @param replies
 287          *            The replies to encode
 288          * @param prefix
 289          *            The prefix for the field names (may be empty, but not
 290          *            {@code null})
 291          * @return The simple field set containing the replies
 292          */
 293         protected SimpleFieldSet encodeReplies(Collection<? extends Reply> replies, String prefix) {
 294                 SimpleFieldSetBuilder replyBuilder = new SimpleFieldSetBuilder();
 295
 296                 int replyIndex = 0;
 297                 replyBuilder.put(prefix + "Replies.Count", replies.size());
 298                 for (Reply reply : replies) {
 299                         String replyPrefix = prefix + "Replies." + replyIndex++ + ".";
 300                         replyBuilder.put(replyPrefix + "ID", reply.getId());
 301                         replyBuilder.put(replyPrefix + "Sone", reply.getSone().getId());
 302                         replyBuilder.put(replyPrefix + "Time", reply.getTime());
 303                         replyBuilder.put(replyPrefix + "Text", encodeString(reply.getText()));
 304                 }
 305
 306                 return replyBuilder.get();
 307         }
 308
 309         /**
 310          * Creates a simple field set from the given collection of Sones that like
 311          * an element.
 312          *
 313          * @param likes
 314          *            The liking Sones
 315          * @param prefix
 316          *            The prefix for the field names (may be empty but not
 317          *            {@code null})
 318          * @return The simple field set containing the likes
 319          */
 320         protected SimpleFieldSet encodeLikes(Collection<? extends Sone> likes, String prefix) {
 321                 SimpleFieldSetBuilder likesBuilder = new SimpleFieldSetBuilder();
 322
 323                 int likeIndex = 0;
 324                 likesBuilder.put(prefix + "Count", likes.size());
 325                 for (Sone sone : likes) {
 326                         String sonePrefix = prefix + likeIndex++ + ".";
 327                         likesBuilder.put(sonePrefix + "ID", sone.getId());
 328                 }
 329
 330                 return likesBuilder.get();
 331         }
 332
 333         //
 334         // OBJECT METHODS
 335         //
 336
 337         /**
 338          * {@inheritDoc}
 339          */
 340         @Override
 341         public String toString() {
 342                 return getClass().getName() + "[writeAccess=" + writeAccess + "]";
 343         }
 344
 345 }