forked from dork/tarantool-java
-
Notifications
You must be signed in to change notification settings - Fork 18
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
types: ResultSet API for TarantoolClient
This commit introduces a new API to handle TarantoolClient result. The concept is similar to the JDBC ResultSet in terms of a getting the data using rows ans columns. Instead of a guessing-style processing the result via List<?>, TarantoolResultSet offers set of typed methods to retrieve the data or get an error if the result cannot be represented as the designated type. Latter case requires to declare formal rules of a casting between the types. In scope of this commit it is supported 11 standard types and conversions between each other. These types are byte, short, int, long, float, double, boolean, BigInteger, BigDecimal, String, and byte[]. Closes: #211
- Loading branch information
1 parent
45e4b39
commit 416a303
Showing
14 changed files
with
3,136 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,197 @@ | ||
| package org.tarantool; | ||
|
|
||
| import org.tarantool.conversion.ConverterRegistry; | ||
| import org.tarantool.conversion.NotConvertibleValueException; | ||
|
|
||
| import java.math.BigInteger; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
|
|
||
| /** | ||
| * Simple implementation of {@link TarantoolResultSet} | ||
| * that contains all tuples in local memory. | ||
| */ | ||
| class InMemoryResultSet implements TarantoolResultSet { | ||
|
|
||
| private final ConverterRegistry converterRegistry; | ||
| private final List<Object> results; | ||
|
|
||
| private int currentIndex; | ||
| private List<Object> currentTuple; | ||
|
|
||
| InMemoryResultSet(List<Object> rawResult, boolean asSingleResult, ConverterRegistry converterRegistry) { | ||
| currentIndex = -1; | ||
| this.converterRegistry = converterRegistry; | ||
|
|
||
| results = new ArrayList<>(); | ||
| ArrayList<Object> copiedResult = new ArrayList<>(rawResult); | ||
| if (asSingleResult) { | ||
| results.add(copiedResult); | ||
| } else { | ||
| results.addAll(copiedResult); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public boolean next() { | ||
| if ((currentIndex + 1) < results.size()) { | ||
| currentTuple = getAsTuple(++currentIndex); | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean previous() { | ||
| if ((currentIndex - 1) >= 0) { | ||
| currentTuple = getAsTuple(--currentIndex); | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| @Override | ||
| public byte getByte(int columnIndex) { | ||
| return getTypedValue(columnIndex, Byte.class, (byte) 0); | ||
| } | ||
|
|
||
| @Override | ||
| public short getShort(int columnIndex) { | ||
| return getTypedValue(columnIndex, Short.class, (short) 0); | ||
| } | ||
|
|
||
| @Override | ||
| public int getInt(int columnIndex) { | ||
| return getTypedValue(columnIndex, Integer.class, 0); | ||
| } | ||
|
|
||
| @Override | ||
| public long getLong(int columnIndex) { | ||
| return getTypedValue(columnIndex, Long.class, 0L); | ||
| } | ||
|
|
||
| @Override | ||
| public float getFloat(int columnIndex) { | ||
| return getTypedValue(columnIndex, Float.class, 0.0f); | ||
| } | ||
|
|
||
| @Override | ||
| public double getDouble(int columnIndex) { | ||
| return getTypedValue(columnIndex, Double.class, 0.0d); | ||
| } | ||
|
|
||
| @Override | ||
| public boolean getBoolean(int columnIndex) { | ||
| return getTypedValue(columnIndex, Boolean.class, false); | ||
| } | ||
|
|
||
| @Override | ||
| public byte[] getBytes(int columnIndex) { | ||
| return getTypedValue(columnIndex, byte[].class, null); | ||
| } | ||
|
|
||
| @Override | ||
| public String getString(int columnIndex) { | ||
| return getTypedValue(columnIndex, String.class, null); | ||
| } | ||
|
|
||
| @Override | ||
| public Object getObject(int columnIndex) { | ||
| return requireInRange(columnIndex); | ||
| } | ||
|
|
||
| @Override | ||
| public BigInteger getBigInteger(int columnIndex) { | ||
| return getTypedValue(columnIndex, BigInteger.class, null); | ||
| } | ||
|
|
||
| @Override | ||
| @SuppressWarnings("unchecked") | ||
| public List<Object> getList(int columnIndex) { | ||
| Object value = requireInRange(columnIndex); | ||
| if (value == null) { | ||
| return null; | ||
| } | ||
| if (value instanceof List<?>) { | ||
| return (List<Object>) value; | ||
| } | ||
| throw new NotConvertibleValueException(value.getClass(), List.class); | ||
| } | ||
|
|
||
| @Override | ||
| @SuppressWarnings("unchecked") | ||
| public Map<Object, Object> getMap(int columnIndex) { | ||
| Object value = requireInRange(columnIndex);; | ||
| if (value == null) { | ||
| return null; | ||
| } | ||
| if (value instanceof Map<?, ?>) { | ||
| return (Map<Object, Object>) value; | ||
| } | ||
| throw new NotConvertibleValueException(value.getClass(), Map.class); | ||
| } | ||
|
|
||
| @Override | ||
| public boolean isNull(int columnIndex) { | ||
| Object value = requireInRange(columnIndex); | ||
| return value == null; | ||
| } | ||
|
|
||
| @Override | ||
| public TarantoolTuple getTuple(int size) { | ||
| requireInRow(); | ||
| int capacity = size == 0 ? currentTuple.size() : size; | ||
| return new TarantoolTuple(currentTuple, capacity); | ||
| } | ||
|
|
||
| @Override | ||
| public int getRowSize() { | ||
| return (currentTuple != null) ? currentTuple.size() : -1; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean isEmpty() { | ||
| return results.isEmpty(); | ||
| } | ||
|
|
||
| @Override | ||
| public void close() { | ||
| results.clear(); | ||
| currentTuple = null; | ||
| currentIndex = -1; | ||
| } | ||
|
|
||
| @SuppressWarnings("unchecked") | ||
| private <R> R getTypedValue(int columnIndex, Class<R> type, R defaultValue) { | ||
| Object value = requireInRange(columnIndex); | ||
| if (value == null) { | ||
| return defaultValue; | ||
| } | ||
| if (type.isInstance(value)) { | ||
| return (R) value; | ||
| } | ||
| return converterRegistry.convert(value, type); | ||
| } | ||
|
|
||
| @SuppressWarnings("unchecked") | ||
| private List<Object> getAsTuple(int index) { | ||
| Object row = results.get(index); | ||
| return (List<Object>) row; | ||
| } | ||
|
|
||
| private Object requireInRange(int index) { | ||
| requireInRow(); | ||
| if (index < 1 || index > currentTuple.size()) { | ||
| throw new IndexOutOfBoundsException("Index out of range: " + index); | ||
| } | ||
| return currentTuple.get(index - 1); | ||
| } | ||
|
|
||
| private void requireInRow() { | ||
| if (currentIndex == -1) { | ||
| throw new IllegalArgumentException("Result set out of row position. Try call next() before."); | ||
| } | ||
| } | ||
|
|
||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.