/
Row.java
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/
Row.java
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package util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import util.converter.Converter;
import util.io.NoSuchColumnException;
/**
* Simple row row of a database, relational file or other relational data.
* Represents all values as Strings, so conversions have to be performed when interpreting data
* or writing it to database.
*/
public class Row implements IRow, List<String> {
protected final ColumnsDef columnsDef;
private final List<String> data;
/**
* @throws RuntimeDataIntegrityException if number of columns in def and data do not match.
*/
public Row(ColumnsDef columnsDef, List<String> data) {
if (columnsDef.getColumnNames().size() != data.size()) {
throw new RuntimeDataIntegrityException("Mismatching number of columns in def and data: " + columnsDef.getColumnNames().size() + " vs. " + data.size());
}
this.columnsDef = columnsDef;
this.data = data;
}
/** Init with null values for all columns */
public Row(ColumnsDef columnsDef) {
this.columnsDef = columnsDef;
this.data = new ArrayList<>(columnsDef.getColumnNames().size());
for (int i=0; i<columnsDef.getColumnNames().size(); i++) {
data.add(null);
}
}
public List<String> getData() {
return data;
}
/** @throws NoSuchColumnException */
@Override
public String get(int column) {
if (column < 0 || column >= data.size()) {
throw new NoSuchColumnException("No such column: " + column);
}
return data.get(column);
}
/** @throws NoSuchColumnException if no such column */
public void set(String columnName, String value) {
Integer column = columnsDef.getColumnIndex(columnName);
if (column == null) {
throw new NoSuchColumnException("No such column: " + columnName);
}
data.set(column, value);
}
@Override
public int size() {
return data.size();
}
/**
* @throws NoSuchColumnException
*/
@Override
public String get(String columnName) {
Integer column = columnsDef.getColumnIndex(columnName);
if (column != null) {
return get(column);
}
else {
throw new NoSuchColumnException("No such column: " + columnName);
}
}
/** Get value of an optional column. In no such column, return null. */
public String getOpt(String columnName) {
if (columnsDef.getColumnIndex(columnName) != null) {
return get(columnName);
}
else {
return null;
}
}
/**
* @return the Integer value, or null if value of column is null or empty string
* @throws NumberFormatException if non-empty non-numeric string
* @throws NoSuchColumnException if no such column
*/
public Integer getInt(String columnName) {
String s = get(columnName);
if (s == null || s.equals("")) {
return null;
}
return Integer.parseInt(s);
}
/**
* @return the Integer value, or null if value of column is null or empty string, or if no such column.
* @throws NumberFormatException if non-empty non-numeric string
* @throws NoSuchColumnException if no such column
*/
public Integer getOptInt(String columnName) {
String s = getOpt(columnName);
if (s == null || s.equals("")) {
return null;
}
return Integer.parseInt(s);
}
/**
* @return the Long value, or null if value of column is null or empty string
* @throws NumberFormatException
* if non-empty non-numeric string
* @throws NoSuchColumnException
* if no such column
*/
public Long getLong(String columnName) {
String s = get(columnName);
if (s == null || s.equals("")) {
return null;
}
return Long.parseLong(s);
}
/**
* Convert all values of a row with ones provided by the given converter.
*
* @param converter
* must convert null to null, as a Row is allowed to have null values.
*/
public void convertValues(Converter<String, String> converter) {
for (int i = 0; i < data.size(); i++) {
String original = data.get(i);
String converted = converter.convert(original);
data.set(i, converted);
}
}
@Override
public ColumnsDef getColumnsDef() {
return columnsDef;
}
/** Perform conversion to map. Note that map representation is not cached, so avoid repeated calls. */
public Map<String,String> toMap() {
Map<String,String> result = new LinkedHashMap<>();
for (String column: columnsDef.getColumnNames()) {
String val = get(column);
result.put(column, val);
}
return result;
}
public static class FieldExtractor implements Converter<Row, String> {
String columnName;
public FieldExtractor(String columnName) {
this.columnName = columnName;
}
@Override
public String convert(Row row) {
return row.get(columnName);
}
}
@Override
public boolean isEmpty() {
return data.isEmpty();
}
@Override
public boolean contains(Object o) {
return data.contains(o);
}
@Override
public Iterator<String> iterator() {
return data.iterator();
}
@Override
public Object[] toArray() {
return data.toArray();
}
@Override
public <T> T[] toArray(T[] a) {
return data.toArray(a);
}
@Override
public boolean add(String e) {
return data.add(e);
}
@Override
public boolean remove(Object o) {
return data.remove(o);
}
@Override
public boolean containsAll(Collection<?> c) {
return data.containsAll(c);
}
@Override
public boolean addAll(Collection<? extends String> c) {
return data.addAll(c);
}
@Override
public boolean addAll(int index, Collection<? extends String> c) {
return data.addAll(index, c);
}
@Override
public boolean removeAll(Collection<?> c) {
return data.removeAll(c);
}
@Override
public boolean retainAll(Collection<?> c) {
return data.retainAll(c);
}
@Override
public void clear() {
data.clear();
}
@Override
public String set(int index, String element) {
return data.set(index, element);
}
@Override
public void add(int index, String element) {
data.add(index, element);
}
@Override
public String remove(int index) {
return data.remove(index);
}
@Override
public int indexOf(Object o) {
return data.indexOf(o);
}
@Override
public int lastIndexOf(Object o) {
return data.lastIndexOf(o);
}
@Override
public ListIterator<String> listIterator() {
return data.listIterator();
}
@Override
public ListIterator<String> listIterator(int index) {
return data.listIterator(index);
}
@Override
public List<String> subList(int fromIndex, int toIndex) {
return data.subList(fromIndex, toIndex);
}
public class FieldExractor implements Converter<Row, String> {
private final String column;
FieldExractor(String column) {
this.column = column;
}
@Override
public String convert(Row row) {
return row.get(column);
}
}
@Override
public String toString() {
return StringUtils.format(toMap(), "=", ", ");
}
/**
* Convert row instances to another kind of row instances, based on a mapping of column names.
*
* In current implementation, behavior for target columns missing from either the conversion
* map or the source data is just to set null as the target column value.
*/
public static class RowConverter <T1 extends Row, T2 extends Row> implements Converter<T1, T2> {
private final util.RowFactory<T2> factory;
private Map<String, String> columnNameMappings;
/**
* @param factory Factory for creating converted instances
* @param columnNameMappings map of TARGET column names to SOURCE column names.
*/
public RowConverter(RowFactory<T2> factory,
Map<String, String> columnNameMappings) {
this.factory = factory;
this.columnNameMappings = columnNameMappings;
}
@Override
public T2 convert(T1 source) {
List<String> targetValues = new ArrayList<>(factory.getColumns().getColumnNames().size());
for (String targetColumn: factory.getColumns().getColumnNames()) {
String sourceColumn = columnNameMappings.get(targetColumn);
if (sourceColumn != null) {
targetValues.add(source.get(sourceColumn));
}
else {
targetValues.add(null);
}
}
return factory.create(targetValues);
}
}
@Override
public int hashCode() {
int hash = HashUtils.SEED;
hash = HashUtils.hash(hash, columnsDef.hashCode());
hash = HashUtils.hash(hash, data.hashCode());
return hash;
}
@Override
public boolean equals(Object param) {
if (!(param instanceof Row)) {
return false;
}
Row other = (Row)param;
return columnsDef.equals(other.columnsDef) && data.equals(other.data);
}
}