org.pentaho.reporting.engine.classic.core.function.strings

Class MapStringExpression

java.lang.Object

org.pentaho.reporting.engine.classic.core.function.AbstractExpression

org.pentaho.reporting.engine.classic.core.function.strings.MapStringExpression

All Implemented Interfaces:

Serializable, Cloneable, Expression

public class MapStringExpression
extends AbstractExpression

Maps a string read from a column into an other string. The possible mappings are given as (key, text) pairs. If the string from the column is null or matches none of the defined keys, a fallback value is returned.

If the fallback value is undefined, the original value is returned instead.

Author:

Thomas Morgner

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
MapStringExpression() Default Constructor.

Method Summary

Modifier and Type	Method and Description
String	getFallbackValue() Returns the value that is returned if none of the predefined keys matches the lookup-value.
String	getField() Returns the name of the field from where to read the key value.
Expression	getInstance() Return a completly separated copy of this function.
String[]	getKey() Returns all defined keys as string array.
String	getKey(int index) Returns a key value at the given index.
int	getKeyCount() Returns the number of keys defined in the expression.
String	getNullValue() Returns the value that is returned if the key-field evaluates to null.
String[]	getText() Returns all defined texts as string-array.
String	getText(int index) Returns the mapped text for the key at the given position.
int	getTextCount() Returns the number of replacement text defined in this expression.
Object	getValue() Performs the lookup by first querying the given field, and then returning the defined text for the key-position.
boolean	isIgnoreCase() Returns, whether the key-lookup should be case-insensitive.
void	setFallbackValue(String fallbackValue) Defines the value that is returned if none of the predefined keys matches the lookup-value.
void	setField(String field) Defines the name of the field from where to read the key value.
void	setIgnoreCase(boolean ignoreCase) Defines, whether the key-lookup should be case-insensitive.
void	setKey(int index, String key) Defines a key value to which the lookup-field's value is compared.
void	setKey(String[] keys) Defines all keys using the values from the string array.
void	setNullValue(String nullValue) Defines the value that is returned if the key-field evaluates to null.
void	setText(int index, String value) Defines the mapped text for the key at the given position.
void	setText(String[] texts) Defines all texts by using the values from the given text-array.

Methods inherited from class org.pentaho.reporting.engine.classic.core.function.AbstractExpression

clone, getDataRow, getDependencyLevel, getName, getReportConfiguration, getResourceBundleFactory, getRuntime, isActive, isDeepTraversing, isPreserve, setActive, setDependencyLevel, setName, setPreserve, setRuntime

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MapStringExpression

public MapStringExpression()

Default Constructor.

Method Detail

getField

public String getField()

Returns the name of the field from where to read the key value.

Returns:

the field name.

setField

public void setField(String field)

Defines the name of the field from where to read the key value.

Parameters:

field - the field name.

getNullValue

public String getNullValue()

Returns the value that is returned if the key-field evaluates to null.

Returns:

the null-value.

setNullValue

public void setNullValue(String nullValue)

Defines the value that is returned if the key-field evaluates to null.

Parameters:

nullValue - the null-value.

getFallbackValue

public String getFallbackValue()

Returns the value that is returned if none of the predefined keys matches the lookup-value.

Returns:

the fallback value.

setFallbackValue

public void setFallbackValue(String fallbackValue)

Defines the value that is returned if none of the predefined keys matches the lookup-value.

Parameters:

fallbackValue - the fallback value.

setKey

public void setKey(int index,
                   String key)

Defines a key value to which the lookup-field's value is compared. If the key is defined, a matching value must be defined too.

Parameters:

index - the index position of the key in the list.

key - the key value.

getKey

public String getKey(int index)

Returns a key value at the given index.

Parameters:

index - the index position of the key in the list.

Returns:

the key value.

getKeyCount

public int getKeyCount()

Returns the number of keys defined in the expression.

Returns:

the number of keys.

getKey

public String[] getKey()

Returns all defined keys as string array.

Returns:

all defined keys.

setKey

public void setKey(String[] keys)

Defines all keys using the values from the string array.

Parameters:

keys - all defined keys.

setText

public void setText(int index,
                    String value)

Defines the mapped text for the key at the given position. This text is returned if the key matches the value read from the lookup-field column.

Parameters:

index - the index of the entry.

value - the text that is returned if the key is selected.

getText

public String getText(int index)

Returns the mapped text for the key at the given position. This text is returned if the key matches the value read from the lookup-field column.

Parameters:

index - the index of the entry.

Returns:

the text that is returned if the key is selected.

getTextCount

public int getTextCount()

Returns the number of replacement text defined in this expression. This should match the number of keys defined.

Returns:

the number of texts defined.

getText

public String[] getText()

Returns all defined texts as string-array.

Returns:

all texts.

setText

public void setText(String[] texts)

Defines all texts by using the values from the given text-array.

Parameters:

texts - the new text-values.

isIgnoreCase

public boolean isIgnoreCase()

Returns, whether the key-lookup should be case-insensitive.

Returns:

true, if the key comparison is case-insensitive, false otherwise.

setIgnoreCase

public void setIgnoreCase(boolean ignoreCase)

Defines, whether the key-lookup should be case-insensitive.

Parameters:

ignoreCase - true, if the key comparison is case-insensitive, false otherwise.

getInstance

public Expression getInstance()

Return a completly separated copy of this function. The copy does no longer share any changeable objects with the original function.

Specified by:

getInstance in interface Expression

Overrides:

getInstance in class AbstractExpression

Returns:

a copy of this function.

getValue

public Object getValue()

Performs the lookup by first querying the given field, and then returning the defined text for the key-position.

Returns:

the value of the function.