public abstract class StarTableJELRowReader extends JELRowReader
In addition to the syntax provided by the superclass, the following symbols are understood:
0<=x<1
which is constant for a given row
within this reader. The quality of the random numbers may not
be particularly good.
Modifier and Type | Field and Description |
---|---|
static java.lang.String |
PARAM_PREFIX
The string which should be prefixed to a table parameter (constant)
name to result in substituting its value.
|
static java.lang.String |
UCD_PREFIX
A string to prefix to a UCD string to indicate the column/parameter
with that UCD.
|
static java.lang.String |
UTYPE_PREFIX
A string to prefix to a Utype string to indicate the column/parameter
with that Utype.
|
COLUMN_ID_CHAR, NULL_QUERY_PREFIX, OBJECT_PREFIX
Constructor and Description |
---|
StarTableJELRowReader(uk.ac.starlink.table.StarTable table)
Constructs a new row reader for a given StarTable.
|
Modifier and Type | Method and Description |
---|---|
protected Constant |
createDescribedValueConstant(uk.ac.starlink.table.DescribedValue dval)
Returns a Constant object based on a DescribedValue.
|
protected boolean |
getBooleanColumnValue(int icol)
Returns a boolean value for a cell of the current row.
|
protected byte |
getByteColumnValue(int icol)
Returns a byte value for a cell of the current row.
|
protected abstract java.lang.Object |
getCell(int icol)
Returns the value for a given column in this reader's table at
the current row.
|
protected char |
getCharColumnValue(int icol)
Returns a char value for a cell of the current row.
|
protected java.lang.Class |
getColumnClass(int icol)
Returns the class of values returned by a given column.
|
protected int |
getColumnIndexByName(java.lang.String name)
Returns the column index of a column in the row given its name.
|
protected Constant |
getConstantByName(java.lang.String name)
Understands table parameters identified case-insensitively
by name (using the
PARAM_PREFIX prefix) or
by UCD (using the UCD_PREFIX prefix) or
by Utype (using the UTYPE_PREFIX prefix). |
abstract long |
getCurrentRow()
Returns the index of the row on which evaluations are currently
taking place.
|
protected double |
getDoubleColumnValue(int icol)
Returns a double value for a cell of the current row.
|
protected float |
getFloatColumnValue(int icol)
Returns a float value for a cell of the current row.
|
protected int |
getIntColumnValue(int icol)
Returns a int value for a cell of the current row.
|
protected long |
getLongColumnValue(int icol)
Returns a long value for a cell of the current row.
|
protected java.lang.Object |
getObjectColumnValue(int icol)
Returns an Object value for a cell of the current row.
|
protected short |
getShortColumnValue(int icol)
Returns a short value for a cell of the current row.
|
protected Constant |
getSpecialByName(java.lang.String name)
Adds to the superclass implementation the following:
"$0", "index" or "$index" gives the (1-based) row number
"$ncol" gives the number of columns in the table
"$nrow" gives the number of rows in the table (null if unknown)
"RANDOM" returns a double random number, always the same for a
given row
|
uk.ac.starlink.table.StarTable |
getTable()
Returns the table associated with this reader.
|
static java.util.regex.Pattern |
getUcdRegex(java.lang.String ucd)
Takes a (non-prefixed) UCD specification and returns a Pattern
actual UCDs should match if they represent the same thing.
|
static java.util.regex.Pattern |
getUtypeRegex(java.lang.String utype)
Takes a (non-prefixed) Utype specification and returns a Pattern
actual Utypes should match if they represent the same thing.
|
protected boolean |
isBlank(int icol)
Indicates whether the value in a given column is null.
|
evaluate, evaluateDouble, foundNull, getBooleanArrayProperty, getBooleanProperty, getBooleanProperty, getBooleanValue, getByteArrayProperty, getByteProperty, getByteValue, getCharArrayProperty, getCharProperty, getCharValue, getColumnIndex, getDateArrayProperty, getDoubleArrayProperty, getDoubleProperty, getDoubleValue, getFloatArrayProperty, getFloatProperty, getFloatValue, getIntArrayProperty, getIntProperty, getIntValue, getLongArrayProperty, getLongProperty, getLongValue, getNumberProperty, getObjectArrayProperty, getObjectProperty, getShortArrayProperty, getShortProperty, getShortValue, getStringArrayProperty, getStringProperty, getTypeName, setFailOnNull, stripPrefix, translate
public static final java.lang.String PARAM_PREFIX
public static final java.lang.String UCD_PREFIX
public static final java.lang.String UTYPE_PREFIX
public StarTableJELRowReader(uk.ac.starlink.table.StarTable table)
table
- the StarTable this reader will read frompublic uk.ac.starlink.table.StarTable getTable()
protected abstract java.lang.Object getCell(int icol) throws java.io.IOException
icol
- column indexjava.io.IOException
public abstract long getCurrentRow()
protected boolean isBlank(int icol)
JELRowReader
isBlank
in class JELRowReader
icol
- column indexprotected java.lang.Class getColumnClass(int icol)
JELRowReader
getColumnClass
in class JELRowReader
icol
- column indexprotected int getColumnIndexByName(java.lang.String name)
JELRowReader
name
does not refer to any known column, return -1.getColumnIndexByName
in class JELRowReader
name
- column nameprotected Constant getConstantByName(java.lang.String name)
PARAM_PREFIX
prefix) or
by UCD (using the UCD_PREFIX
prefix) or
by Utype (using the UTYPE_PREFIX
prefix).getConstantByName
in class JELRowReader
name
- constant nameprotected Constant getSpecialByName(java.lang.String name)
getSpecialByName
in class JELRowReader
name
- special nameprotected Constant createDescribedValueConstant(uk.ac.starlink.table.DescribedValue dval)
dval
- described value objectprotected boolean getBooleanColumnValue(int icol)
JELRowReader
JELRowReader.foundNull()
(and return any value) if the result
is null.getBooleanColumnValue
in class JELRowReader
icol
- column indexprotected byte getByteColumnValue(int icol)
JELRowReader
JELRowReader.foundNull()
(and return any value) if the result
is null.getByteColumnValue
in class JELRowReader
icol
- column indexprotected char getCharColumnValue(int icol)
JELRowReader
JELRowReader.foundNull()
(and return any value) if the result
is null.getCharColumnValue
in class JELRowReader
icol
- column indexprotected short getShortColumnValue(int icol)
JELRowReader
JELRowReader.foundNull()
(and return any value) if the result
is null.getShortColumnValue
in class JELRowReader
icol
- column indexprotected int getIntColumnValue(int icol)
JELRowReader
JELRowReader.foundNull()
(and return any value) if the result
is null.getIntColumnValue
in class JELRowReader
icol
- column indexprotected long getLongColumnValue(int icol)
JELRowReader
JELRowReader.foundNull()
(and return any value) if the result
is null.getLongColumnValue
in class JELRowReader
icol
- column indexprotected float getFloatColumnValue(int icol)
JELRowReader
JELRowReader.foundNull()
(and return any value) if the result
is null.getFloatColumnValue
in class JELRowReader
icol
- column indexprotected double getDoubleColumnValue(int icol)
JELRowReader
JELRowReader.foundNull()
(and return any value) if the result
is null.getDoubleColumnValue
in class JELRowReader
icol
- column indexprotected java.lang.Object getObjectColumnValue(int icol)
JELRowReader
getObjectColumnValue
in class JELRowReader
icol
- column indexpublic static java.util.regex.Pattern getUcdRegex(java.lang.String ucd)
ucd
it is considered as a trailing match-all wildcard.ucd
- UCD1 or UCD1+ specification/patternpublic static java.util.regex.Pattern getUtypeRegex(java.lang.String utype)
utype
- utype specificationCopyright © 2017 Central Laboratory of the Research Councils. All Rights Reserved.