- All Implemented Interfaces:
- Serializable,- Cloneable
- Direct Known Subclasses:
- PrinterResolution
ResolutionSyntax is an abstract base class providing the common
 implementation of all attributes denoting a printer resolution.
 
 A resolution attribute's value consists of two items, the cross feed
 direction resolution and the feed direction resolution. A resolution
 attribute may be constructed by supplying the two values and indicating the
 units in which the values are measured. Methods are provided to return a
 resolution attribute's values, indicating the units in which the values are
 to be returned. The two most common resolution units are dots per inch (dpi)
 and dots per centimeter (dpcm), and exported constants DPI and
 DPCM are provided for indicating those units.
 
Once constructed, a resolution attribute's value is immutable.
Design
A resolution attribute's cross feed direction resolution and feed direction resolution values are stored internally using units of dots per 100 inches (dphi). Storing the values in dphi rather than, say, metric units allows precise integer arithmetic conversions between dpi and dphi and between dpcm and dphi: 1 dpi = 100 dphi, 1 dpcm = 254 dphi. Thus, the values can be stored into and retrieved back from a resolution attribute in either units with no loss of precision. This would not be guaranteed if a floating point representation were used. However, roundoff error will in general occur if a resolution attribute's values are created in one units and retrieved in different units; for example, 600 dpi will be rounded to 236 dpcm, whereas the true value (to five figures) is 236.22 dpcm.
Storing the values internally in common units of dphi lets two resolution attributes be compared without regard to the units in which they were created; for example, 300 dpcm will compare equal to 762 dpi, as they both are stored as 76200 dphi. In particular, a lookup service can match resolution attributes based on equality of their serialized representations regardless of the units in which they were created. Again, using integers for internal storage allows precise equality comparisons to be done, which would not be guaranteed if a floating point representation were used.
 The exported constant DPI is actually the conversion factor by
 which to multiply a value in dpi to get the value in dphi. Likewise, the
 exported constant DPCM is the conversion factor by which to
 multiply a value in dpcm to get the value in dphi. A client can specify a
 resolution value in units other than dpi or dpcm by supplying its own
 conversion factor. However, since the internal units of dphi was chosen with
 supporting only the external units of dpi and dpcm in mind, there is no
 guarantee that the conversion factor for the client's units will be an exact
 integer. If the conversion factor isn't an exact integer, resolution values
 in the client's units won't be stored precisely.
- See Also:
- 
Field SummaryFields
- 
Constructor SummaryConstructorsConstructorDescriptionResolutionSyntax(int crossFeedResolution, int feedResolution, int units) Construct a new resolution attribute from the given items.
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Method SummaryModifier and TypeMethodDescriptionbooleanReturns whether this resolution attribute is equivalent to the passed in object.intgetCrossFeedResolution(int units) Returns this resolution attribute's cross feed direction resolution in the given units.protected intReturns this resolution attribute's cross feed direction resolution in units of dphi.intgetFeedResolution(int units) Returns this resolution attribute's feed direction resolution in the given units.protected intReturns this resolution attribute's feed direction resolution in units of dphi.int[]getResolution(int units) Get this resolution attribute's resolution values in the given units.inthashCode()Returns a hash code value for this resolution attribute.booleanlessThanOrEquals(ResolutionSyntax other) Determine whether this resolution attribute's value is less than or equal to the given resolution attribute's value.toString()Returns a string version of this resolution attribute.Returns a string version of this resolution attribute in the given units.
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Field Details- 
DPIpublic static final int DPIValue to indicate units of dots per inch (dpi). It is actually the conversion factor by which to multiply dpi to yield dphi (100).- See Also:
 
- 
DPCMpublic static final int DPCMValue to indicate units of dots per centimeter (dpcm). It is actually the conversion factor by which to multiply dpcm to yield dphi (254).- See Also:
 
 
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Constructor Details- 
ResolutionSyntaxpublic ResolutionSyntax(int crossFeedResolution, int feedResolution, int units) Construct a new resolution attribute from the given items.- Parameters:
- crossFeedResolution- cross feed direction resolution
- feedResolution- feed direction resolution
- units- unit conversion factor, e.g.- DPIor- DPCM
- Throws:
- IllegalArgumentException- if- crossFeedResolution < 1or- feedResolution < 1or- units < 1
 
 
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Method Details- 
getResolutionpublic int[] getResolution(int units) Get this resolution attribute's resolution values in the given units. The values are rounded to the nearest integer.- Parameters:
- units- unit conversion factor, e.g.- DPIor- DPCM
- Returns:
- a two-element array with the cross feed direction resolution at index 0 and the feed direction resolution at index 1
- Throws:
- IllegalArgumentException- if- units < 1
 
- 
getCrossFeedResolutionpublic int getCrossFeedResolution(int units) Returns this resolution attribute's cross feed direction resolution in the given units. The value is rounded to the nearest integer.- Parameters:
- units- unit conversion factor, e.g.- DPIor- DPCM
- Returns:
- cross feed direction resolution
- Throws:
- IllegalArgumentException- if- units < 1
 
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getFeedResolutionpublic int getFeedResolution(int units) Returns this resolution attribute's feed direction resolution in the given units. The value is rounded to the nearest integer.- Parameters:
- units- unit conversion factor, e.g.- DPIor- DPCM
- Returns:
- feed direction resolution
- Throws:
- IllegalArgumentException- if- units < 1
 
- 
toStringReturns a string version of this resolution attribute in the given units. The string takes the form"CxF U", where C is the cross feed direction resolution, F is the feed direction resolution, and U is the units name. The values are rounded to the nearest integer.- Parameters:
- units- unit conversion factor, e.g.- CODE>DPIor- DPCM
- unitsName- units name string, e.g.- "dpi"or- "dpcm". If- null, no units name is appended to the result.
- Returns:
- string version of this resolution attribute
- Throws:
- IllegalArgumentException- if- units < 1
 
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lessThanOrEqualsDetermine whether this resolution attribute's value is less than or equal to the given resolution attribute's value. This is true if all of the following conditions are true:- This attribute's cross feed direction resolution is less than or
   equal to the otherattribute's cross feed direction resolution.
- This attribute's feed direction resolution is less than or equal to
   the otherattribute's feed direction resolution.
 - Parameters:
- other- resolution attribute to compare with
- Returns:
- trueif this resolution attribute is less than or equal to the- otherresolution attribute,- falseotherwise
- Throws:
- NullPointerException- if- otheris- null
 
- This attribute's cross feed direction resolution is less than or
   equal to the 
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equalsReturns whether this resolution attribute is equivalent to the passed in object. To be equivalent, all of the following conditions must be true:- objectis not- null.
- objectis an instance of class- ResolutionSyntax.
- This attribute's cross feed direction resolution is equal to
   object's cross feed direction resolution.
- This attribute's feed direction resolution is equal to
   object's feed direction resolution.
 
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hashCodepublic int hashCode()Returns a hash code value for this resolution attribute.
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toStringReturns a string version of this resolution attribute. The string takes the form"CxF dphi", where C is the cross feed direction resolution and F is the feed direction resolution. The values are reported in the internal units of dphi.
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getCrossFeedResolutionDphiprotected int getCrossFeedResolutionDphi()Returns this resolution attribute's cross feed direction resolution in units of dphi. (For use in a subclass.)- Returns:
- cross feed direction resolution
 
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getFeedResolutionDphiprotected int getFeedResolutionDphi()Returns this resolution attribute's feed direction resolution in units of dphi. (For use in a subclass.)- Returns:
- feed direction resolution
 
 
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