Examples of org.ethereum.trie.TrieImpl$ScanAction

org.ethereum.trie.TrieImpl
The modified Merkle Patricia tree (trie) provides a persistent data structure to map between arbitrary-length binary data (byte arrays). It is defined in terms of a mutable data structure to map between 256-bit binary fragments and arbitrary-length binary data, typically implemented as a database. The core of the trie, and its sole requirement in terms of the protocol specification is to provide a single value that identifies a given set of key-value pairs, which may either a 32 byte sequence or the empty byte sequence. It is left as an implementation consideration to store and maintain the structure of the trie in a manner the allows effective and efficient realisation of the protocol. The trie implements a caching mechanism and will use cached values if they are present. If a node is not present in the cache it will try to fetch it from the database and store the cached value. Note: the data isn't persisted unless `sync` is explicitly called. www.ethereumJ.com @author : Nick Savers Created on: 20/05/2014 10:44

        assertEquals(LONG_STRING+"1", new String(trie.get(cat)));
    }


    @Test
    public void testUpdateLongToShortString() {
        TrieImpl trie = new TrieImpl(mockDb);


        trie.update(cat, LONG_STRING);
        assertEquals(LONG_STRING, new String(trie.get(cat)));


        trie.update(cat, dog+"1");
        assertEquals(dog+"1", new String(trie.get(cat)));
    }

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    @Test
    public void testDeleteShortString1() {
        String ROOT_HASH_BEFORE = "a9539c810cc2e8fa20785bdd78ec36cc1dab4b41f0d531e80a5e5fd25c3037ee";
        String ROOT_HASH_AFTER = "fc5120b4a711bca1f5bb54769525b11b3fb9a8d6ac0b8bf08cbb248770521758";
        TrieImpl trie = new TrieImpl(mockDb);


        trie.update(cat, dog);
        assertEquals(dog, new String(trie.get(cat)));


        trie.update(ca, dude);
        assertEquals(dude, new String(trie.get(ca)));
        assertEquals(ROOT_HASH_BEFORE, Hex.toHexString(trie.getRootHash()));


        trie.delete(ca);
        assertEquals("", new String(trie.get(ca)));
        assertEquals(ROOT_HASH_AFTER, Hex.toHexString(trie.getRootHash()));
    }

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    @Test
    public void testDeleteShortString2() {
        String ROOT_HASH_BEFORE = "a9539c810cc2e8fa20785bdd78ec36cc1dab4b41f0d531e80a5e5fd25c3037ee";
        String ROOT_HASH_AFTER = "b25e1b5be78dbadf6c4e817c6d170bbb47e9916f8f6cc4607c5f3819ce98497b";
        TrieImpl trie = new TrieImpl(mockDb);


        trie.update(ca, dude);
        assertEquals(dude, new String(trie.get(ca)));


        trie.update(cat, dog);
        assertEquals(dog, new String(trie.get(cat)));
        assertEquals(ROOT_HASH_BEFORE, Hex.toHexString(trie.getRootHash()));


        trie.delete(cat);
        assertEquals("", new String(trie.get(cat)));
        assertEquals(ROOT_HASH_AFTER, Hex.toHexString(trie.getRootHash()));
    }

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    @Test
    public void testDeleteShortString3() {
        String ROOT_HASH_BEFORE = "778ab82a7e8236ea2ff7bb9cfa46688e7241c1fd445bf2941416881a6ee192eb";
        String ROOT_HASH_AFTER = "05875807b8f3e735188d2479add82f96dee4db5aff00dc63f07a7e27d0deab65";
        TrieImpl trie = new TrieImpl(mockDb);


        trie.update(cat, dude);
        assertEquals(dude, new String(trie.get(cat)));


        trie.update(dog, test);
        assertEquals(test, new String(trie.get(dog)));
        assertEquals(ROOT_HASH_BEFORE, Hex.toHexString(trie.getRootHash()));


        trie.delete(dog);
        assertEquals("", new String(trie.get(dog)));
        assertEquals(ROOT_HASH_AFTER, Hex.toHexString(trie.getRootHash()));
    }

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    @Test
    public void testDeleteLongString1() {
        String ROOT_HASH_BEFORE = "318961a1c8f3724286e8e80d312352f01450bc4892c165cc7614e1c2e5a0012a";
        String ROOT_HASH_AFTER = "63356ecf33b083e244122fca7a9b128cc7620d438d5d62e4f8b5168f1fb0527b";
        TrieImpl trie = new TrieImpl(mockDb);


        trie.update(cat, LONG_STRING);
        assertEquals(LONG_STRING, new String(trie.get(cat)));


        trie.update(dog, LONG_STRING);
        assertEquals(LONG_STRING, new String(trie.get(dog)));
        assertEquals(ROOT_HASH_BEFORE, Hex.toHexString(trie.getRootHash()));


        trie.delete(dog);
        assertEquals("", new String(trie.get(dog)));
        assertEquals(ROOT_HASH_AFTER, Hex.toHexString(trie.getRootHash()));
    }

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    @Test
    public void testDeleteLongString2() {
        String ROOT_HASH_BEFORE = "e020de34ca26f8d373ff2c0a8ac3a4cb9032bfa7a194c68330b7ac3584a1d388";
        String ROOT_HASH_AFTER = "334511f0c4897677b782d13a6fa1e58e18de6b24879d57ced430bad5ac831cb2";
        TrieImpl trie = new TrieImpl(mockDb);


        trie.update(ca, LONG_STRING);
        assertEquals(LONG_STRING, new String(trie.get(ca)));


        trie.update(cat, LONG_STRING);
        assertEquals(LONG_STRING, new String(trie.get(cat)));
        assertEquals(ROOT_HASH_BEFORE, Hex.toHexString(trie.getRootHash()));


        trie.delete(cat);
        assertEquals("", new String(trie.get(cat)));
        assertEquals(ROOT_HASH_AFTER, Hex.toHexString(trie.getRootHash()));
    }

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