Package org.apache.fop.fo.properties

Class PropertyMaker

java.lang.Object
org.apache.fop.fo.properties.PropertyMaker
All Implemented Interfaces:
Cloneable
Direct Known Subclasses:
CharacterProperty.Maker, ColorProperty.Maker, CompoundPropertyMaker, EnumProperty.Maker, FontFamilyProperty.Maker, FontShorthandProperty.Maker, LengthProperty.Maker, ListProperty.Maker, NumberProperty.Maker, NumberProperty.PositiveIntegerMaker, OptionalCharacterProperty.Maker, StringProperty.Maker, TableFObj.ColumnNumberPropertyMaker, ToBeImplementedProperty.Maker, URIProperty.Maker
public class PropertyMaker extends Object implements Cloneable
Base class for all property makers

  • Field Details

    • propId

      protected int propId
      the property ID

    • defaultValue

      protected String defaultValue
      the default value for the maker

    • contextDep

      protected boolean contextDep
      Indicates whether the property is context-dependant and therefore can't be cached.

    • setByShorthand

      protected boolean setByShorthand
      Indicates whether the property is set through a shorthand.

    • defaultProperty

      protected Property defaultProperty
      default property

    • corresponding

      protected CorrespondingPropertyMaker corresponding
      Maker for 'corresponding' properties

  • Constructor Details

    • PropertyMaker

      public PropertyMaker(int propId)
      Construct an instance of a Property.Maker for the given property.
      Parameters:
      propId - The Constant ID of the property to be made.

  • Method Details

    • getPropId

      public int getPropId()
      Returns:
      the name of the property for this Maker

    • useGeneric

      public void useGeneric(PropertyMaker generic)
      Copy all the values from the generic maker to this maker.
      Parameters:
      generic - a generic property maker.

    • setInherited

      public void setInherited(boolean inherited)
      Set the inherited flag.
      Parameters:
      inherited - true if this is an inherited property

    • addKeyword

      public void addKeyword(String keyword, String value)
      Add a keyword-equiv to the maker.
      Parameters:
      keyword - the keyword
      value - the value to be used when the keyword is specified

    • addEnum

      public void addEnum(String constant, Property value)
      Add a enum constant.
      Parameters:
      constant - the enum constant
      value - the Property value to use when the constant is specified

    • addSubpropMaker

      public void addSubpropMaker(PropertyMaker subproperty)
      Add a subproperty to this maker.
      Parameters:
      subproperty - the PropertyMaker for the subproperty

    • getSubpropMaker

      public PropertyMaker getSubpropMaker(int subpropertyId)
      Return a subproperty maker for the subpropertyId.
      Parameters:
      subpropertyId - The subpropertyId of the maker.
      Returns:
      The subproperty maker.

    • addShorthand

      public void addShorthand(PropertyMaker shorthand)
      Add a shorthand to this maker. Only an Integer is added to the shorthands list. Later the Integers are replaced with references to the actual shorthand property makers.
      Parameters:
      shorthand - a property maker thar is that is checked for shorthand values.

    • setDatatypeParser

      public void setDatatypeParser(ShorthandParser parser)
      Set the shorthand datatype parser.
      Parameters:
      parser - the shorthand parser

    • setDefault

      public void setDefault(String defaultValue)
      Set the default value for this maker.
      Parameters:
      defaultValue - the default value.

    • setDefault

      public void setDefault(String defaultValue, boolean contextDep)
      Set the default value for this maker.
      Parameters:
      defaultValue - the default value
      contextDep - true when the value context dependent and must not be cached.

    • setPercentBase

      public void setPercentBase(int percentBase)
      Set the percent base identifier for this maker.
      Parameters:
      percentBase - the percent base (ex. LengthBase.FONTSIZE)

    • setByShorthand

      public void setByShorthand(boolean setByShorthand)
      Set the setByShorthand flag which only is applicable for subproperty makers. It should be true for the subproperties which must be assigned a value when the base property is assigned a attribute value directly.
      Parameters:
      setByShorthand - true if this subproperty must be set when the base property is set

    • setCorresponding

      public void setCorresponding(CorrespondingPropertyMaker corresponding)
      Set the correspoding property information.
      Parameters:
      corresponding - a corresponding maker where the isForcedCorresponding and compute methods are delegated to.

    • makeNewProperty

      public Property makeNewProperty()
      Create a new empty property. Must be overriden in compound subclasses.
      Returns:
      a new instance of the Property for which this is a maker.

    • findProperty

      public Property findProperty(PropertyList propertyList, boolean tryInherit) throws PropertyException
      If the property is a relative property with a corresponding absolute value specified, the absolute value is used. This is also true of the inheritance priority (I think...) If the property is an "absolute" property and it isn't specified, then we try to compute it from the corresponding relative property: this happens in computeProperty.
      Parameters:
      propertyList - the applicable property list
      tryInherit - true if inherited properties should be examined.
      Returns:
      the property value
      Throws:
      PropertyException - if there is a problem evaluating the property

    • get

      public Property get(int subpropertyId, PropertyList propertyList, boolean tryInherit, boolean tryDefault) throws PropertyException
      Return the property on the current FlowObject. Depending on the passed flags, this will try to compute it based on other properties, or if it is inheritable, to return the inherited value. If all else fails, it returns the default value.
      Parameters:
      subpropertyId - The subproperty id of the property being retrieved. Is 0 when retrieving a base property.
      propertyList - The PropertyList object being built for this FO.
      tryInherit - true if inherited properties should be examined.
      tryDefault - true if the default value should be returned.
      Returns:
      the property value
      Throws:
      PropertyException - if there is a problem evaluating the property

    • isInherited

      public boolean isInherited()
      Default implementation of isInherited.
      Returns:
      A boolean indicating whether this property is inherited.

    • getPercentBase

      public PercentBase getPercentBase(PropertyList pl) throws PropertyException
      This is used to handle properties specified as a percentage of some "base length", such as the content width of their containing box. Overridden by subclasses which allow percent specifications. See the documentation on properties.xsl for details.
      Parameters:
      pl - the PropertyList containing the property. (TODO: explain what this is used for, or remove it from the signature.)
      Returns:
      an object implementing the PercentBase interface.
      Throws:
      PropertyException - if there is a problem while evaluating the base property

    • getSubprop

      public Property getSubprop(Property p, int subpropertyId)
      Return a property value for the given component of a compound property.
      Parameters:
      p - A property value for a compound property type such as SpaceProperty.
      subpropertyId - the id of the component whose value is to be returned. NOTE: this is only to ease porting when calls are made to PropertyList.get() using a component name of a compound property, such as get("space.optimum"). The recommended technique is: get("space").getOptimum(). Overridden by property maker subclasses which handle compound properties.
      Returns:
      the Property containing the subproperty

    • setSubprop

      protected Property setSubprop(Property baseProperty, int subpropertyId, Property subproperty)
      Set a component in a compound property and return the modified compound property object. This default implementation returns the original base property without modifying it. It is overridden by property maker subclasses which handle compound properties.
      Parameters:
      baseProperty - The Property object representing the compound property, such as SpaceProperty.
      subpropertyId - The ID of the component whose value is specified.
      subproperty - A Property object holding the specified value of the component to be set.
      Returns:
      The modified compound property object.

    • make

      public Property make(PropertyList propertyList) throws PropertyException
      Return the default value.
      Parameters:
      propertyList - The PropertyList object being built for this FO.
      Returns:
      the Property object corresponding to the parameters
      Throws:
      PropertyException - for invalid or inconsisten FO input

    • make

      public Property make(PropertyList propertyList, String value, FObj fo) throws PropertyException
      Create a Property object from an attribute specification.
      Parameters:
      propertyList - The PropertyList object being built for this FO.
      value - The attribute value.
      fo - The parent FO for the FO whose property is being made.
      Returns:
      The initialized Property object.
      Throws:
      PropertyException - for invalid or inconsistent FO input

    • make

      public Property make(Property baseProperty, int subpropertyId, PropertyList propertyList, String value, FObj fo) throws PropertyException
      Make a property value for a compound property. If the property value is already partially initialized, this method will modify it.
      Parameters:
      baseProperty - The Property object representing the compound property, for example: SpaceProperty.
      subpropertyId - The Constants ID of the subproperty (component) whose value is specified.
      propertyList - The propertyList being built.
      fo - The parent FO for the FO whose property is being made.
      value - the value of the
      Returns:
      baseProperty (or if null, a new compound property object) with the new subproperty added
      Throws:
      PropertyException - for invalid or inconsistent FO input

    • convertShorthandProperty

      public Property convertShorthandProperty(PropertyList propertyList, Property prop, FObj fo) throws PropertyException
      Converts a shorthand property
      Parameters:
      propertyList - the propertyList for which to convert
      prop - the shorthand property
      fo - ...
      Returns:
      the converted property
      Throws:
      PropertyException - ...

    • checkEnumValues

      protected Property checkEnumValues(String value)
      For properties that contain enumerated values. This method should be overridden by subclasses.
      Parameters:
      value - the string containing the property value
      Returns:
      the Property encapsulating the enumerated equivalent of the input value

    • checkValueKeywords

      public String checkValueKeywords(String keyword)
      Return a String to be parsed if the passed value corresponds to a keyword which can be parsed and used to initialize the property. For example, the border-width family of properties can have the initializers "thin", "medium", or "thick". The FOPropertyMapping file specifies a length value equivalent for these keywords, such as "0.5pt" for "thin".
      Parameters:
      keyword - the string value of property attribute.
      Returns:
      a String containing a parseable equivalent or null if the passed value isn't a keyword initializer for this Property

    • convertProperty

      protected Property convertProperty(Property p, PropertyList propertyList, FObj fo) throws PropertyException
      Return a Property object based on the passed Property object. This method is called if the Property object built by the parser isn't the right type for this property. It is overridden by subclasses.
      Parameters:
      p - The Property object return by the expression parser
      propertyList - The PropertyList object being built for this FO.
      fo - The parent FO for the FO whose property is being made.
      Returns:
      A Property of the correct type or null if the parsed value can't be converted to the correct type.
      Throws:
      PropertyException - for invalid or inconsistent FO input

    • convertPropertyDatatype

      protected Property convertPropertyDatatype(Property p, PropertyList propertyList, FObj fo) throws PropertyException
      For properties that have more than one legal way to be specified, this routine should be overridden to attempt to set them based upon the other methods. For example, colors may be specified using an RGB model, or they may be specified using an NCname.
      Parameters:
      p - property whose datatype should be converted
      propertyList - collection of properties. (TODO: explain why this is needed, or remove it from the signature.)
      fo - The parent FO for the FO whose property is being made. why this is needed, or remove it from the signature).
      Returns:
      an Property with the appropriate datatype used
      Throws:
      PropertyException - for invalid or inconsistent input

    • compute

      protected Property compute(PropertyList propertyList) throws PropertyException
      Return a Property object representing the value of this property, based on other property values for this FO. A special case is properties which inherit the specified value, rather than the computed value.
      Parameters:
      propertyList - The PropertyList for the FO.
      Returns:
      Property A computed Property value or null if no rules are specified to compute the value.
      Throws:
      PropertyException - for invalid or inconsistent FO input

    • getShorthand

      public Property getShorthand(PropertyList propertyList) throws PropertyException
      For properties that can be set by shorthand properties, this method should return the Property, if any, that is parsed from any shorthand properties that affect this property. This method expects to be overridden by subclasses. For example, the border-right-width property could be set implicitly from the border shorthand property, the border-width shorthand property, or the border-right shorthand property. This method should be overridden in the appropriate subclass to check each of these, and return an appropriate border-right-width Property object.
      Parameters:
      propertyList - the collection of properties to be considered
      Returns:
      the Property, if found, the correspons, otherwise, null
      Throws:
      PropertyException - if there is a problem while evaluating the shorthand

    • getName

      public String getName()
      Returns:
      the name of the property this maker is used for.

    • clone

      public Object clone()
      Return a clone of the makers. Used by useGeneric() to clone the subproperty makers of the generic compound makers.
      Overrides:
      clone in class Object