net.sf.jasperreports.engine.util
Class JdkGlyphFixTextMeasurer

java.lang.Object
  net.sf.jasperreports.engine.fill.TextMeasurer
      net.sf.jasperreports.engine.util.JdkGlyphFixTextMeasurer

All Implemented Interfaces:

JRTextMeasurer

public class JdkGlyphFixTextMeasurer
extends TextMeasurer

A text measurer implementation that extends the default text measurer and adds a workaround for Sun JDK bug 6367148/ 6611637.

The workaround consists of simply reattempting the text measuring when a java.lang.NullPointer exception is thrown from sun.font.GlyphLayout.

Version:

$Id: JdkGlyphFixTextMeasurer.java 3717 2010-04-09 10:01:33Z teodord $

Author:

Lucian Chirita ([email protected])

See Also:

JdkGlyphFixTextMeasurerFactory

Nested Class Summary

Nested classes/interfaces inherited from class net.sf.jasperreports.engine.fill.TextMeasurer

TextMeasurer.TextMeasuredState

Field Summary

static int	DEFAULT_ATTEMPT_SLEEP The default between attempts sleep time.
static int	DEFAULT_ATTEMPTS The default attempt count.
protected static java.lang.String	JDK_EXCEPTION_CLASS_PREFIX
static java.lang.String	PROPERTY_ATTEMPT_SLEEP A property that specifies the number of milliseconds to sleep between measuring reattempts.
static java.lang.String	PROPERTY_ATTEMPTS A property that specifies the number of times the measurer should attempt to measure a single text element before giving up.
static java.lang.String	PROPERTY_CATCH_EMPTY_STACKTRACE Whether java.lang.NullPointer exceptions with empty stacktraces should be caught.

Constructor Summary

JdkGlyphFixTextMeasurer(JRCommonText textElement)
Create a text measurer for a text element.

Method Summary

protected boolean	isJdkGlyphError(java.lang.NullPointerException e)
JRMeasuredText	measure(JRStyledText styledText, int remainingTextStart, int availableStretchHeight, boolean canOverflow) Calls super.measure, catches sun.font.GlyphLayout NPEs and reattempts the call.

Methods inherited from class net.sf.jasperreports.engine.fill.TextMeasurer

appendTruncateSuffix, getTextPropertiesHolder, getTruncateSuffix, initialize, isToTruncateAtChar, processLastTruncatedRow, renderNextLine, renderParagraph, setAttributes, setAttributes, truncateLastLineAtChar

Methods inherited from class java.lang.Object

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

Field Detail

JDK_EXCEPTION_CLASS_PREFIX

protected static final java.lang.String JDK_EXCEPTION_CLASS_PREFIX

See Also:

Constant Field Values

DEFAULT_ATTEMPTS

public static final int DEFAULT_ATTEMPTS

The default attempt count.

See Also:

Constant Field Values

DEFAULT_ATTEMPT_SLEEP

public static final int DEFAULT_ATTEMPT_SLEEP

The default between attempts sleep time.

See Also:

Constant Field Values

PROPERTY_ATTEMPTS

public static final java.lang.String PROPERTY_ATTEMPTS

A property that specifies the number of times the measurer should attempt to measure a single text element before giving up. The default value is 20.

See Also:

DEFAULT_ATTEMPTS, Constant Field Values

PROPERTY_ATTEMPT_SLEEP

public static final java.lang.String PROPERTY_ATTEMPT_SLEEP

A property that specifies the number of milliseconds to sleep between measuring reattempts. The default value is 0, which means that the measurer will not pause between reattempts.

See Also:

DEFAULT_ATTEMPT_SLEEP, Constant Field Values

PROPERTY_CATCH_EMPTY_STACKTRACE

public static final java.lang.String PROPERTY_CATCH_EMPTY_STACKTRACE

Whether java.lang.NullPointer exceptions with empty stacktraces should be caught. This is useful when running on a Sun server JVM (java -server), which might omit exception stacktraces in some cases.

See Also:

Constant Field Values

Constructor Detail

JdkGlyphFixTextMeasurer

public JdkGlyphFixTextMeasurer(JRCommonText textElement)

Create a text measurer for a text element.

Parameters:

textElement - the text element

Method Detail

measure

public JRMeasuredText measure(JRStyledText styledText,
                              int remainingTextStart,
                              int availableStretchHeight,
                              boolean canOverflow)

Calls super.measure, catches sun.font.GlyphLayout NPEs and reattempts the call.

Specified by:

measure in interface JRTextMeasurer

Overrides:

measure in class TextMeasurer

Parameters:

styledText - the full text

remainingTextStart - the start index of the remaining text

availableStretchHeight - the available stretch height

canOverflow - whether the text element is able to overflow

Returns:

text measuring information

isJdkGlyphError

protected boolean isJdkGlyphError(java.lang.NullPointerException e)