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.NullPointerException is thrown from sun.font.GlyphLayout.

Author:

Lucian Chirita (lucianc@users.sourceforge.net)

See Also:

JdkGlyphFixTextMeasurerFactory

Nested Class Summary

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

TextMeasurer.TextMeasuredState

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_ATTEMPT_SLEEP The default between attempts sleep time.
static int	DEFAULT_ATTEMPTS The default attempt count.
protected static String	JDK_EXCEPTION_CLASS_PREFIX
static String	PROPERTY_ATTEMPT_SLEEP A property that specifies the number of milliseconds to sleep between measuring reattempts.
static 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 String	PROPERTY_CATCH_EMPTY_STACKTRACE Whether java.lang.NullPointer exceptions with empty stacktraces should be caught.

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

jasperReportsContext, leftPadding, maxHeight, measuredState, prevMeasuredState, PROPERTY_MEASURE_SIMPLE_TEXTS, rightPadding, textElement, width

Constructor Summary

Constructors

Constructor and Description
JdkGlyphFixTextMeasurer(JasperReportsContext jasperReportsContext, JRCommonText textElement) Create a text measurer for a text element.
JdkGlyphFixTextMeasurer(JRCommonText textElement) Deprecated. Replaced by JdkGlyphFixTextMeasurer(JasperReportsContext, JRCommonText).

Method Summary

Methods

Modifier and Type	Method and Description
protected boolean	isJdkGlyphError(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, getFontRenderContext, getTextPropertiesHolder, getTruncateSuffix, hasParagraphIndents, initialize, isToTruncateAtChar, processLastTruncatedRow, renderNextLine, renderParagraph, 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 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 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 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 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(JasperReportsContext jasperReportsContext,
                       JRCommonText textElement)

Create a text measurer for a text element.

Parameters:

textElement - the text element

JdkGlyphFixTextMeasurer

public JdkGlyphFixTextMeasurer(JRCommonText textElement)

Deprecated. Replaced by JdkGlyphFixTextMeasurer(JasperReportsContext, JRCommonText).

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(NullPointerException e)