Object
- DefaultFilterVisitor
- - FilterAttributeExtractor
  - - MetaBufferEstimator

All Implemented Interfaces:

ExpressionVisitor, FilterVisitor, StyleVisitor
```
public class MetaBufferEstimator
extends FilterAttributeExtractor
implements StyleVisitor
```
Parses a style or part of it and returns the size of the largest stroke and the biggest point symbolizer whose width is specified with a literal expression.
Also provides an indication whether the stroke width is accurate, or if a non literal width has been found.

Field Summary

Fields
Modifier and Type	Field	Description
`protected FilterAttributeExtractor`	`attributeExtractor`
`protected int`	`buffer`
`protected boolean`	`estimateAccurate`
`protected static Logger`	`LOGGER`	The logger for the rendering module.

Fields inherited from class FilterAttributeExtractor
attributeNames, featureType, propertyNames, usingDynamicProperties, usingVolatileFunctions

Constructor Summary

Constructors
Constructor	Description
`MetaBufferEstimator()`	Builds an estimator suitable for styles without expressions
`MetaBufferEstimator(Feature sample)`	Builds an estimator suitable for styles with expression, will evaluate against the provided feature

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`evaluateWidth(Expression width)`
`int`	`getBuffer()`
`protected double`	`getDouble(Expression ex)`
`protected int`	`getPositiveValue(Expression ex)`
`protected boolean`	`isConstant(Expression ex)`
`boolean`	`isEstimateAccurate()`
`protected boolean`	`isNull(Expression exp)`
`void`	`reset()`	Should you reuse this extractor multiple time, calling this method will reset the buffer and flags
`void`	`visit(AnchorPoint ap)`	Called when accept is called on an anchor point
`void`	`visit(ChannelSelection cs)`	Called when accept is called on a raster `ChannelSelection` element
`void`	`visit(ColorMap map)`	Called when accept is called on a raster color map
`void`	`visit(ColorMapEntry entry)`	Called when accept is called on a raster color map entry
`void`	`visit(ContrastEnhancement contrastEnhancement)`	Called when accept is called on a raster ContrastEnhancement element
`void`	`visit(Displacement dis)`	Called when accept is called on a displacement
`void`	`visit(ExternalGraphic exgr)`	Called when accept is called on an external graphic
`void`	`visit(FeatureTypeConstraint ftc)`	Called when accept is called on a FeatureTypeConstraint.
`void`	`visit(FeatureTypeStyle fts)`	Called when accept is called on a fetauretypestyle
`void`	`visit(Fill fill)`	Called when accept is called on a fill
`void`	`visit(Graphic gr)`	Called when accept is called on a graphic
`void`	`visit(Halo halo)`	Called when accept is called on a halo
`void`	`visit(ImageOutline outline)`	Called when accept is called on a raster `ImageOutline` element
`void`	`visit(LinePlacement lp)`	Called when accept is called on a Line Placement
`void`	`visit(LineSymbolizer line)`	Called when accept is called on a linesymbolizer
`void`	`visit(Mark mark)`	Called when accept is called on a mark
`void`	`visit(NamedLayer layer)`	Called when accept is called on a NamedLayer.
`void`	`visit(OverlapBehavior ob)`	Called when accept is called on a raster `OverlapBehaviorEnum` element
`void`	`visit(PointPlacement pp)`	Called when accept is called on a Point Placement
`void`	`visit(PointSymbolizer ps)`	Called when accept is called on a pointsymbolizer
`void`	`visit(PolygonSymbolizer poly)`	Called when accept is called on a polygon symbolizer
`void`	`visit(RasterSymbolizer rs)`	Called when accept is called on a rastersymbolizer
`void`	`visit(Rule rule)`	Called when accept is called on a rule
`void`	`visit(SelectedChannelType sct)`	Called when accept is called on a raster `SelectedChannelType` element
`void`	`visit(ShadedRelief sr)`	Called when accept is called on a raster `ShadedRelief` element
`void`	`visit(Stroke stroke)`	Called when accept is called on a stroke
`void`	`visit(Style style)`	Called when accept is called on a Style.
`void`	`visit(StyledLayerDescriptor sld)`	Called when accept is called on a StyledLayerDescriptor.
`void`	`visit(Symbolizer sym)`	since it is impossible to create a Symbolizer this method should generate an exception or warning.
`void`	`visit(TextSymbolizer text)`	Called when accept is called on a textsymbolizer
`void`	`visit(UserLayer layer)`	Called when accept is called on a UserLayer.

Methods inherited from class FilterAttributeExtractor
clear, getAttributeNames, getAttributeNameSet, getPropertyNameSet, isConstantExpression, isUsingDynamincProperties, visit, visit

Methods inherited from class DefaultFilterVisitor
visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visitNullFilter

Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - LOGGER
```
protected static final Logger LOGGER
```
    The logger for the rendering module.
  - attributeExtractor
```
protected FilterAttributeExtractor attributeExtractor
```
  - estimateAccurate
```
protected boolean estimateAccurate
```
    UML property:
    
    name="estimateAccurate"
  - buffer
```
protected int buffer
```
    UML property:
    
    name="buffer"
- Constructor Detail
  - MetaBufferEstimator
```
public MetaBufferEstimator()
```
    Builds an estimator suitable for styles without expressions
  - MetaBufferEstimator
```
public MetaBufferEstimator(Feature sample)
```
    Builds an estimator suitable for styles with expression, will evaluate against the provided feature
- Method Detail
  - reset
```
public void reset()
```
    Should you reuse this extractor multiple time, calling this method will reset the buffer and flags
  - getBuffer
```
public int getBuffer()
```
    UML property:
    
    name="buffer"
  - isEstimateAccurate
```
public boolean isEstimateAccurate()
```
    UML property:
    
    name="estimateAccurate"
  - visit
```
public void visit(Style style)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a Style.
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    style - The style to visit
  - visit
```
public void visit(Rule rule)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a rule
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    rule - the rule to visit
  - visit
```
public void visit(FeatureTypeStyle fts)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a fetauretypestyle
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    fts - the feature type styler to visit
  - visit
```
public void visit(Fill fill)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a fill
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    fill - the fill to be visited
  - visit
```
public void visit(Stroke stroke)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a stroke
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    stroke - the stroke to visit
    
    See Also:
    
    StyleVisitor.visit(org.geotools.api.style.Stroke)
  - isNull
```
protected boolean isNull(Expression exp)
```
  - visit
```
public void visit(Symbolizer sym)
```
    Description copied from interface: StyleVisitor
    
    since it is impossible to create a Symbolizer this method should generate an exception or warning.
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    sym - the symbolizer to visit
    
    See Also:
    
    StyleVisitor.visit(org.geotools.api.style.Symbolizer)
  - visit
```
public void visit(RasterSymbolizer rs)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a rastersymbolizer
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    rs - the raster symbolizer to visit
  - visit
```
public void visit(PointSymbolizer ps)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a pointsymbolizer
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    ps - the point symbolizer to visit
    
    See Also:
    
    StyleVisitor.visit(org.geotools.api.style.PointSymbolizer)
  - visit
```
public void visit(LineSymbolizer line)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a linesymbolizer
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    line - the line symbolizer to visit
    
    See Also:
    
    StyleVisitor.visit(org.geotools.api.style.LineSymbolizer)
  - visit
```
public void visit(PolygonSymbolizer poly)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a polygon symbolizer
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    poly - the polygon symbolizer to visit
    
    See Also:
    
    StyleVisitor.visit(org.geotools.api.style.PolygonSymbolizer)
  - visit
```
public void visit(TextSymbolizer text)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a textsymbolizer
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    text - the text symbolizer to visit
    
    See Also:
    
    StyleVisitor.visit(org.geotools.api.style.TextSymbolizer)
  - visit
```
public void visit(Graphic gr)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a graphic
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    gr - the graphic to visit
    
    See Also:
    
    StyleVisitor.visit(org.geotools.api.style.Graphic)
  - evaluateWidth
```
protected void evaluateWidth(Expression width)
```
  - getPositiveValue
```
protected int getPositiveValue(Expression ex)
```
  - getDouble
```
protected double getDouble(Expression ex)
```
  - isConstant
```
protected boolean isConstant(Expression ex)
```
  - visit
```
public void visit(Mark mark)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a mark
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    mark - the mark to visit
    
    See Also:
    
    StyleVisitor.visit(org.geotools.api.style.Mark)
  - visit
```
public void visit(ExternalGraphic exgr)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on an external graphic
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    exgr - the external graphic to visit
    
    See Also:
    
    StyleVisitor.visit(org.geotools.api.style.ExternalGraphic)
  - visit
```
public void visit(PointPlacement pp)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a Point Placement
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    pp - the point placement to visit
    
    See Also:
    
    StyleVisitor.visit(org.geotools.api.style.PointPlacement)
  - visit
```
public void visit(AnchorPoint ap)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on an anchor point
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    ap - the anchor point to visit
    
    See Also:
    
    StyleVisitor.visit(org.geotools.api.style.AnchorPoint)
  - visit
```
public void visit(Displacement dis)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a displacement
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    dis - the displacement to visit
    
    See Also:
    
    StyleVisitor.visit(org.geotools.api.style.Displacement)
  - visit
```
public void visit(LinePlacement lp)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a Line Placement
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    lp - the line placement to visit
    
    See Also:
    
    StyleVisitor.visit(org.geotools.api.style.LinePlacement)
  - visit
```
public void visit(Halo halo)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a halo
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    halo - the halo to visit
    
    See Also:
    
    StyleVisitor.visit(org.geotools.api.style.Halo)
  - visit
```
public void visit(StyledLayerDescriptor sld)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a StyledLayerDescriptor.
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    sld - The StyledLayerDescriptor to visit
  - visit
```
public void visit(NamedLayer layer)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a NamedLayer.
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    layer - The NamedLayer to visit
  - visit
```
public void visit(UserLayer layer)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a UserLayer.
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    layer - The UserLayer to visit
  - visit
```
public void visit(FeatureTypeConstraint ftc)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a FeatureTypeConstraint.
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    ftc - The FeatureTypeConstraint to visit
  - visit
```
public void visit(ColorMap map)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a raster color map
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    map - the color map to visit
  - visit
```
public void visit(ColorMapEntry entry)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a raster color map entry
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    entry - the color map to visit
  - visit
```
public void visit(ContrastEnhancement contrastEnhancement)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a raster ContrastEnhancement element
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    contrastEnhancement - the ContrastEnhancement to visit.
  - visit
```
public void visit(ImageOutline outline)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a raster ImageOutline element
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    outline - the ImageOutline to visit.
  - visit
```
public void visit(ChannelSelection cs)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a raster ChannelSelection element
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    cs - the ChannelSelection to visit.
  - visit
```
public void visit(OverlapBehavior ob)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a raster OverlapBehaviorEnum element
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    ob - the OverlapBehaviorEnum to visit.
  - visit
```
public void visit(SelectedChannelType sct)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a raster SelectedChannelType element
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    sct - the SelectedChannelType to visit.
  - visit
```
public void visit(ShadedRelief sr)
```
    Description copied from interface: StyleVisitor
    
    Called when accept is called on a raster ShadedRelief element
    
    Specified by:
    
    visit in interface StyleVisitor
    
    Parameters:
    
    sr - the ShadedRelief to visit.

Class MetaBufferEstimator

Field Summary

Fields inherited from class FilterAttributeExtractor

Constructor Summary

Method Summary

Methods inherited from class FilterAttributeExtractor

Methods inherited from class DefaultFilterVisitor

Methods inherited from class Object

Field Detail

LOGGER

attributeExtractor

estimateAccurate

buffer

Constructor Detail

MetaBufferEstimator

MetaBufferEstimator

Method Detail

reset

getBuffer

isEstimateAccurate

visit

visit

visit

visit

visit

isNull

visit

visit

visit

visit

visit

visit

visit

evaluateWidth

getPositiveValue

getDouble

isConstant

visit

visit

visit

visit

visit

visit

visit

visit

visit

visit

visit

visit

visit

visit

visit

visit

visit

visit

visit