/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.testing;
import com.google.common.base.Preconditions;
import java.math.BigDecimal;
import java.math.MathContext;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.toList;
/**
* Materialize all values in a row
* Special handling is added for Double types for approximate comparisons
*/
public class MaterializedRow
{
private final int precision;
private final List<Object> values;
public MaterializedRow(int precision, Object... values)
{
this(precision, Arrays.asList(requireNonNull(values, "values is null")));
}
public MaterializedRow(int precision, List<Object> values)
{
checkArgument(precision > 0, "Need at least one digit of precision");
this.precision = precision;
this.values = (List<Object>) processValue(precision, values);
}
private static Object processValue(int precision, Object value)
{
if (value instanceof Double) {
return new ApproximateDouble(((Double) value), precision);
}
if (value instanceof Float) {
return new ApproximateFloat(((Float) value), precision);
}
if (value instanceof List) {
return ((List<?>) value).stream()
.map(element -> processValue(precision, element))
.collect(toList());
}
if (value instanceof Map) {
Map<Object, Object> map = new HashMap<>();
for (Entry<Object, Object> entry : ((Map<Object, Object>) value).entrySet()) {
map.put(processValue(precision, entry.getKey()), processValue(precision, entry.getValue()));
}
return map;
}
if (value instanceof byte[]) {
return ByteBuffer.wrap((byte[]) value);
}
return value;
}
public int getPrecision()
{
return precision;
}
public int getFieldCount()
{
return values.size();
}
public List<Object> getFields()
{
return values.stream()
.map(MaterializedRow::processField)
.collect(toList());
}
public Object getField(int field)
{
Preconditions.checkElementIndex(field, values.size());
return processField(values.get(field));
}
private static Object processField(Object value)
{
if (value instanceof ApproximateNumeric) {
return ((ApproximateNumeric) value).getValue();
}
if (value instanceof List) {
return ((List<?>) value).stream()
.map(MaterializedRow::processField)
.collect(toList());
}
if (value instanceof Map) {
Map<Object, Object> map = new HashMap<>();
for (Entry<Object, Object> entry : ((Map<Object, Object>) value).entrySet()) {
map.put(processField(entry.getKey()), processField(entry.getValue()));
}
return map;
}
if (value instanceof ByteBuffer) {
return ((ByteBuffer) value).array();
}
return value;
}
@Override
public String toString()
{
return values.toString();
}
@Override
public boolean equals(Object obj)
{
if (obj == this) {
return true;
}
if ((obj == null) || (getClass() != obj.getClass())) {
return false;
}
MaterializedRow o = (MaterializedRow) obj;
return Objects.equals(values, o.values);
}
@Override
public int hashCode()
{
return Objects.hash(values);
}
private abstract static class ApproximateNumeric
{
public abstract Number getValue();
protected abstract Number getNormalizedValue();
@Override
public String toString()
{
return getValue().toString();
}
@Override
public boolean equals(Object obj)
{
if (obj == this) {
return true;
}
if ((obj == null) || (getClass() != obj.getClass())) {
return false;
}
ApproximateNumeric o = (ApproximateNumeric) obj;
return Objects.equals(getNormalizedValue(), o.getNormalizedValue());
}
@Override
public int hashCode()
{
return Objects.hash(getNormalizedValue());
}
}
private static class ApproximateDouble
extends ApproximateNumeric
{
private final Double value;
private final int precision;
private ApproximateDouble(Double value, int precision)
{
this.value = requireNonNull(value, "value is null");
this.precision = precision;
}
@Override
public Number getValue()
{
return value;
}
@Override
protected Number getNormalizedValue()
{
if (value.isNaN() || value.isInfinite()) {
return value;
}
return new BigDecimal(getValue().doubleValue()).round(new MathContext(precision)).doubleValue();
}
}
private static class ApproximateFloat
extends ApproximateNumeric
{
private final Float value;
private final int precision;
private ApproximateFloat(Float value, int precision)
{
this.value = requireNonNull(value, "value is null");
this.precision = precision;
}
@Override
public Number getValue()
{
return value;
}
@Override
protected Number getNormalizedValue()
{
if (value.isNaN() || value.isInfinite()) {
return value;
}
return new BigDecimal(getValue().floatValue()).round(new MathContext(precision)).floatValue();
}
}
}