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< > BotCompany Repo | #1002363 // PersistentList (developing)

JavaX fragment (include)

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// a persistent list using a clever combination of persisting and logging
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// (well, only logging as of now)
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// Note: don't put in static initializer (programID not set yet)
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static class PersistentList<A> extends AbstractList<A> {
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  new List<A> m;
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  File file;
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  PersistentList(S fileName) {
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    this(getProgramFile(fileName));
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  }
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  PersistentList(S progID, S fileName) {
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    this(getProgramFile(progID, fileName));
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  }
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  *(File *file) {
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    for (S s : scanLog(file)) pcall {
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      L l = cast unstructure(s);
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      if (eq(l.get(0), "add"))
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        m.put((A) l.get(1), (B) l.get(2));
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      else if (eq(l.get(0), "remove"))
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        m.remove((A) l.get(1));
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      else
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        print("Unknown command in log: " + l.get(0));
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    }
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  }
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  // just delegates
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  public int size() {
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    ret m.size();
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  }
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  public B get(int i) {
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    ret m.get(i);
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  }
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  // TODO: calling remove() in the iterator will have unpersisted
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  // effects.
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  public Set<Map.Entry<A,B>> entrySet() {
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    ret m.entrySet();
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  }
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  // delegates with logging
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  public B put(A a, B b) {
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    B result = m.put(a, b);
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    logQuoted(file, structure(litlist("add", a, b)));
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    ret result;
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  }
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  public B remove(O a) {
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    B result = m.remove(a);
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    logQuoted(file, structure(litlist("remove", a)));
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    ret result;
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  }
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}

Author comment

Began life as a copy of #1002063

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Snippet ID: #1002363
Snippet name: PersistentList (developing)
Eternal ID of this version: #1002363/1
Text MD5: c716b0c1c35951ffe4a0b6b8f5b92548
Author: stefan
Category: javax
Type: JavaX fragment (include)
Public (visible to everyone): Yes
Archived (hidden from active list): No
Created/modified: 2016-01-09 18:42:24
Source code size: 1358 bytes / 58 lines
Pitched / IR pitched: No / No
Views / Downloads: 619 / 541
Referenced in: [show references]