tech.tablesaw.columns.AbstractColumnParser Maven / Gradle / Ivy
package tech.tablesaw.columns;
import java.util.List;
import tech.tablesaw.api.ColumnType;
import tech.tablesaw.io.TypeUtils;
/**
* A parser for turning strings into objects that can be inserted into a column
*
* It serves two purposes, to determine if a string can be parsed into the desired object type,
* and to actually parse the string.
*
*
Implementations may take additional parameters such as a locale or DateTimeFormatter.
*
* @param The Class of object to be inserted: String for StringColumn, LocalDate for DateColumn,
* etc.
*/
public abstract class AbstractColumnParser {
private final ColumnType columnType;
protected List missingValueStrings = TypeUtils.MISSING_INDICATORS;
public AbstractColumnParser(ColumnType columnType) {
this.columnType = columnType;
}
public abstract boolean canParse(String s);
public abstract T parse(String s);
public ColumnType columnType() {
return columnType;
}
public boolean isMissing(String s) {
if (s == null) {
return true;
}
return s.isEmpty() || missingValueStrings.contains(s);
}
public byte parseByte(String s) {
throw new UnsupportedOperationException(
this.getClass().getSimpleName() + " doesn't support parsing to booleans");
}
public int parseInt(String s) {
throw new UnsupportedOperationException(
this.getClass().getSimpleName() + " doesn't support parsing to ints");
}
public short parseShort(String s) {
throw new UnsupportedOperationException(
this.getClass().getSimpleName() + " doesn't support parsing to shorts");
}
public long parseLong(String s) {
throw new UnsupportedOperationException(
this.getClass().getSimpleName() + " doesn't support parsing to longs");
}
public double parseDouble(String s) {
throw new UnsupportedOperationException(
this.getClass().getSimpleName() + " doesn't support parsing to doubles");
}
public float parseFloat(String s) {
throw new UnsupportedOperationException(
this.getClass().getSimpleName() + " doesn't support parsing to floats");
}
protected static String remove(final String str, final char remove) {
if (str == null || str.indexOf(remove) == -1) {
return str;
}
final char[] chars = str.toCharArray();
int pos = 0;
for (int i = 0; i < chars.length; i++) {
if (chars[i] != remove) {
chars[pos++] = chars[i];
}
}
return new String(chars, 0, pos);
}
}