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Record.java
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Record.java
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/*
* Copyright 2019 TWO SIGMA OPEN SOURCE, LLC
*
* 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.twosigma.webtau.data.table;
import com.twosigma.webtau.data.MultiValue;
import com.twosigma.webtau.data.table.autogen.TableDataCellValueGenerator;
import java.util.*;
import java.util.function.Function;
import java.util.stream.Stream;
public class Record {
private final Header header;
private final List<Object> values;
private final CompositeKey key;
private final boolean hasMultiValues;
private final boolean hasValueGenerators;
public Record(Header header, Stream<Object> values) {
this.header = header;
RecordFromStream recordFromStream = new RecordFromStream(values);
hasMultiValues = recordFromStream.hasMultiValues;
hasValueGenerators = recordFromStream.hasValueGenerators;
this.values = recordFromStream.values;
this.key = header.hasKeyColumns() ?
new CompositeKey(header.getKeyIdxStream().map(this::get)) : null;
}
public Header getHeader() {
return header;
}
public CompositeKey getKey() {
return key;
}
@SuppressWarnings("unchecked")
public <E> E get(String name) {
return (E) values.get(header.columnIdxByName(name));
}
@SuppressWarnings("unchecked")
public <E> E get(int idx) {
header.validateIdx(idx);
return (E) values.get(idx);
}
public Stream<Object> values() {
return values.stream();
}
public boolean hasMultiValues() {
return this.hasMultiValues;
}
public boolean hasValueGenerators() {
return this.hasValueGenerators;
}
@SuppressWarnings("unchecked")
public <T, R> Stream<R> mapValues(Function<T, R> mapper) {
return values.stream().map(v -> mapper.apply((T) v));
}
public List<Record> unwrapMultiValues() {
MultiValuesUnwrapper multiValuesUnwrapper = new MultiValuesUnwrapper();
multiValuesUnwrapper.add(this);
return multiValuesUnwrapper.result;
}
public Record evaluateValueGenerators(Record previous, int rowIdx) {
if (!hasValueGenerators()) {
return this;
}
List<Object> newValues = new ArrayList<>(this.values.size());
int colIdx = 0;
for (Object value : this.values) {
if (value instanceof TableDataCellValueGenerator) {
newValues.add(((TableDataCellValueGenerator) value).generate(
this, previous, rowIdx, colIdx, header.columnNameByIdx(colIdx)));
} else {
newValues.add(value);
}
colIdx++;
}
return new Record(header, newValues.stream());
}
public Map<String, Object> toMap() {
Map<String, Object> result = new LinkedHashMap<>();
header.getColumnIdxStream().forEach(i -> result.put(header.columnNameByIdx(i), values.get(i)));
return result;
}
@Override
public String toString() {
return toMap().toString();
}
private static class MultiValuesUnwrapper {
private List<Record> result;
MultiValuesUnwrapper() {
this.result = new ArrayList<>();
}
void add(Record record) {
for (int idx = record.values.size() - 1; idx >=0; idx--) {
Object value = record.values.get(idx);
if (!(value instanceof MultiValue)) {
continue;
}
ArrayList<Object> copy = new ArrayList<>(record.values);
final int columnIdx = idx;
((MultiValue) value).getValues().forEach(mv -> {
copy.set(columnIdx, mv);
add(new Record(record.header, copy.stream()));
});
return;
}
result.add(record);
}
}
private static class RecordFromStream {
private boolean hasMultiValues;
private boolean hasValueGenerators;
private List<Object> values;
public RecordFromStream(Stream<Object> valuesStream) {
values = new ArrayList<>();
valuesStream.forEach(v -> {
if (v instanceof MultiValue) {
hasMultiValues = true;
}
if (v instanceof TableDataCellValueGenerator) {
hasValueGenerators = true;
}
values.add(v);
});
}
}
}