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