--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/java/sql-dk/src/main/java/info/globalcode/sql/dk/batch/BatchDecoder.java	Mon Mar 04 20:15:24 2019 +0100
@@ -0,0 +1,108 @@
+/**
+ * SQL-DK
+ * Copyright © 2014 František Kučera (frantovo.cz)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package info.globalcode.sql.dk.batch;
+
+import info.globalcode.sql.dk.Parameter;
+import info.globalcode.sql.dk.SQLCommand;
+import info.globalcode.sql.dk.SQLCommandNumbered;
+import java.io.DataInputStream;
+import java.io.InputStream;
+import static info.globalcode.sql.dk.batch.BatchConstants.*;
+import static info.globalcode.sql.dk.Functions.toHex;
+import info.globalcode.sql.dk.SQLType;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ *
+ * @author Ing. František Kučera (frantovo.cz)
+ */
+public class BatchDecoder {
+
+	public Batch decode(InputStream in) throws BatchException {
+		return new BatchFromStream(new DataInputStream(in));
+	}
+
+	private class BatchFromStream implements Batch {
+
+		private DataInputStream in;
+		private boolean hasNext;
+
+		public BatchFromStream(DataInputStream in) throws BatchException {
+			this.in = in;
+			hasNext = verifyHeader();
+		}
+
+		@Override
+		public boolean hasNext() throws BatchException {
+			return hasNext;
+		}
+
+		@Override
+		public SQLCommand next() throws BatchException {
+			try {
+				String sql = readNextString();
+
+				int paramCount = in.readInt();
+				List<Parameter> parameters = new ArrayList<>(paramCount);
+
+				for (int i = 0; i < paramCount; i++) {
+					SQLType type = SQLType.valueOf(in.readInt());
+					String value = readNextString();
+					parameters.add(new Parameter(value, type));
+				}
+
+				hasNext = verifyHeader();
+
+				SQLCommand sqlCommand = new SQLCommandNumbered(sql, parameters);
+				return sqlCommand;
+			} catch (IOException e) {
+				throw new BatchException("Unable to read batch", e);
+			}
+		}
+
+		private String readNextString() throws IOException {
+			byte[] buffer = new byte[in.readInt()];
+			in.read(buffer);
+			return new String(buffer, CHARSET);
+		}
+
+		/**
+		 * @return true if correct batch header was found | false if EOF was found
+		 * @throws BatchException if unexpected data was found (not batch header nor EOF)
+		 */
+		private boolean verifyHeader() throws BatchException {
+			try {
+				byte[] buffer = new byte[BATCH_HEADER.length];
+				int bytesRead = in.read(buffer);
+
+				if (bytesRead == BATCH_HEADER.length && Arrays.equals(buffer, BATCH_HEADER)) {
+					return true;
+				} else if (bytesRead == -1) {
+					return false;
+				} else {
+					throw new BatchException("This is not SQL-DK batch: " + toHex(buffer));
+				}
+			} catch (IOException e) {
+				throw new BatchException("Unable to read batch header", e);
+			}
+		}
+	}
+}