Examples of org.apache.jackrabbit.oak.api.Blob

org.apache.jackrabbit.oak.api.Blob
Immutable representation of a binary value of finite length.
Two blobs are considered equal in terms of {@link Object#equals(Object)}if they contain the same sequences of bytes. Implementations can optimize the equality checks by using strong hash codes or other similar means as long as they comply with the above definition of equality.
Due to their nature blobs should not be used as keys in hash tables. To highlight that and to ensure semantic correctness of the equality contract across different blob implementations, the {@link #hashCode()}method of all blob instances should return zero.


    @Override
    public String write(InputStream in) throws MicroKernelException {
        try {
            final Hasher hasher = Hashing.sha256().newHasher();
            Blob blob = store.createBlob(
                    new CheckedInputStream(in, new Checksum() {
                        @Override
                        public void update(byte[] b, int off, int len) {
                            hasher.putBytes(b, off, len);
                        }
                        @Override
                        public void update(int b) {
                            hasher.putByte((byte) b);
                        }
                        @Override
                        public void reset() {
                            throw new UnsupportedOperationException();
                        }
                        @Override
                        public long getValue() {
                            throw new UnsupportedOperationException();
                        }
                    }));
            HashCode hash = hasher.hash();


            // wrap into AbstractBlob for the SHA-256 memorization feature
            if (!(blob instanceof AbstractBlob)) {
                final Blob b = blob;
                blob = new AbstractBlob(hash) {
                    @Override
                    public long length() {
                        return b.length();
                    }
                    @Override
                    public InputStream getNewStream() {
                        return b.getNewStream();
                    }
                };
            }


            String id = hash.toString();

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    private PropertyState compact(PropertyState property) {
        String name = property.getName();
        Type<?> type = property.getType();
        if (type == BINARY) {
            Blob blob = compact(property.getValue(Type.BINARY));
            return BinaryPropertyState.binaryProperty(name, blob);
        } else if (type == BINARIES) {
            List<Blob> blobs = new ArrayList<Blob>();
            for (Blob blob : property.getValue(BINARIES)) {
                blobs.add(compact(blob));

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                this.data = newArrayList();
            }


            this.length = data.size() * blobSize;
            if (!data.isEmpty()) {
                Blob last = data.get(data.size() - 1);
                this.length -= blobSize - last.length();
            }
        }

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        }


        private void flushBlob() throws IOException {
            if (blobModified) {
                int n = (int) Math.min(blobSize, length - index * blobSize);
                Blob b = file.createBlob(new ByteArrayInputStream(blob, 0, n));
                if (index < data.size()) {
                    data.set(index, b);
                } else {
                    checkState(index == data.size());
                    data.add(b);

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        return r.id;
    }


    @Override
    public long getLength(String blobId) throws MicroKernelException {
        Blob blob = blobs.get(blobId);
        if (blob != null) {
            return blob.length();
        } else {
            throw new MicroKernelException("Blob not found: " + blobId);
        }
    }

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    }


    @Override
    public int read(String blobId, long pos, byte[] buff, int off, int length)
            throws MicroKernelException {
        Blob blob = blobs.get(blobId);
        if (blob != null) {
            try {
                InputStream stream = blob.getNewStream();
                try {
                    ByteStreams.skipFully(stream, pos);
                    return stream.read(buff, off, length);
                } finally {
                    stream.close();

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        PropertyState p;
        if (reader.matches('[')) {
            p = DocumentPropertyState.readArrayProperty("x", nodeStore, reader);
            if (p.getType() == Type.BINARIES) {
                for (int i = 0; i < p.count(); i++) {
                    Blob b = p.getValue(Type.BINARY, i);
                    batch.add(b);
                }
            }
        } else {
            p = DocumentPropertyState.readProperty("x", nodeStore, reader);
            if (p.getType() == Type.BINARY) {
                Blob b = p.getValue(Type.BINARY);
                batch.add(b);
            }
        }
    }

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            throws IOException {
        NodeBuilder file = addChild(node, name, JcrConstants.NT_FILE);
        NodeBuilder content = addChild(file, JcrConstants.JCR_CONTENT,
                JcrConstants.NT_RESOURCE);
        content.setProperty(JcrConstants.JCR_MIMETYPE, "text/plain");
        Blob blob = store.createBlob(new ByteArrayInputStream("Apache Oak".getBytes()));
        content.setProperty(JcrConstants.JCR_DATA, blob);
        return file;
    }

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            if (value instanceof BinaryImpl) {
                // No need to create the value again if we have it already underlying the binary
                return ((BinaryImpl) value).getBinaryValue();
            } else if (value instanceof ReferenceBinary) {
                String reference = ((ReferenceBinary) value).getReference();
                Blob blob = root.getBlob(reference);
                if (blob != null) {
                    return createBinaryValue(blob);
                }
            }
            return createBinaryValue(value.getStream());

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    public void test() throws Exception {
        DocumentNodeStore s = new DocumentMK.Builder().getNodeStore();
        NodeBuilder a = s.getRoot().builder();
        HashSet<String> set = new HashSet<String>();
        for (int i = 0; i < 100; i++) {
            Blob b = a.createBlob(randomStream(i, 10));
            set.add(b.toString());
            a.child("c" + i).setProperty("x", b);
        }
        s.merge(a, EmptyHook.INSTANCE, CommitInfo.EMPTY);
        Iterator<Blob> it = s.getReferencedBlobsIterator();
        while (it.hasNext()) {
            Blob b = it.next();
            set.remove(b.toString());
        }
        assertTrue(set.isEmpty());
        s.dispose();
    }

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