Examples of com.fasterxml.storemate.shared.hash.IncrementalHasher32

com.fasterxml.storemate.shared.hash.IncrementalHasher32

Base class for hashers that can work in incremental fashion, that is, where content is sent via one or more calls to {@link #update}, before final hash value is calculated.

Note: implementations are required to retain state so that it is possible to calculate "partial" hash values throughout content, and call {@link #calculateHash} multiple times, at different points. This is differentfrom many other hash calculation abstractions.

NOTE: since 0.9.21, this implements {@link Checksum}, for interoperability

    public static IncrementalHasher32 startChecksum() {
      return new IncrementalMurmur3Hasher();
    }


    public static IncrementalHasher32 startChecksum(byte[] data, int offset, int len) {
        IncrementalHasher32 hasher = startChecksum();
        hasher.update(data, offset, len);
        return hasher;
    }

        assertEquals(6L, in.readCount());
        assertEquals(2L, in.skipCount());


        // and then hash... have to count 
        int exp = calcChecksum32(INPUT, 0, 6);
        IncrementalHasher32 hasher = in.getHasher();
        assertNotNull(hasher);
        assertEquals(exp, hasher.calculateHash());
        
        in.close();
    }

        out.write(INPUT, 0, 7);
        out.write(8);


        assertEquals(8, out.count());
        int exp = calcChecksum32(INPUT);
        IncrementalHasher32 hasher = out.getHasher();
        assertNotNull(hasher);
        assertEquals(exp, hasher.calculateHash());
        
        out.close();
    }

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