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      <h1>Property classes overview</h1>
      <p>
        <font size= "-2" >by&nbsp;Peter B. West</font>
      </p>
      <ul class= "minitoc" >
        <li>
          <a href = "#N10014" >Properties: packages</a>
          <ul class= "minitoc" >
            <li>
              <a href = "#N10019" >org.apache.fop.fo</a>
            </li>
            <li>
              <a href = "#N100AC" >org.apache.fop.fo.properties</a>
            </li>
            <li>
              <a href = "#N100EE" >org.apache.fop.fo.expr</a>
            </li>
            <li>
              <a href = "#N10134" >org.apache.fop.datatypes</a>
            </li>
            <li>
              <a href = "#N101A2"
              >org.apache.fop.datatypes.indirect</a>
            </li>
          </ul>
        </li>
      </ul>
      <a name= "N10014" ></a> <h3>Properties: packages</h3> <a name=
      "N10019" ></a> <h4>org.apache.fop.fo</h4>
      <dl>
        <dt>
          <a href = "javascript:parent.displayCode(
             'PropNames.html#PropNamesClass'
          )" ><em>PropNames</em></a>
        </dt>
        <dd>
          This class maintains an array of <a href=
          "javascript:parent.displayCode(
          'PropNames.html#propertyNames' )" >property names</a>,
          synchronized to a complete set of property name <a href =
          "javascript:parent.displayCode( 'PropNames.html#NO_PROPERTY'
          )" >constants</a> for indexing property-based arrays.  It
          includes methods to <a href =
          "javascript:parent.displayCode(
          'PropNames.html#getPropertyName' )" >convert an index to a
          name</a> and to <a href = "javascript:parent.displayCode(
          'PropNames.html#getPropertyIndex' )" >convert a property
          name to an index</a>.
        </dd>
        <dt>
          <a href = "PropertyConsts-class.html" ><em>PropertyConsts</em></a>
        </dt>
        <dd>
          A singleton instance of <span class= "codefrag"
          >PropertyConsts</span> is created by the static initializer
          of the <a href = "javascript:parent.displayCode(
          'PropertyConsts.html#pconsts' )" >pconsts</a> field.
          Working from the property indices defined in PropNames, the
          methods in this class collect and supply the values of
          fields defined in property objects into arrays.<br> The
          heart of this class in the method <a href =
          "javascript:parent.displayCode(
          'PropertyConsts.html#setupProperty' )" >setupProperty</a>,
          which constructs the property name from the index,
          instantiates a singleton of the appropriate class, and
          extracts static fields by reflection from that instance into
          the arrays of field values.
        </dd>
        <dt>
          <a href = "javascript:parent.displayCode(
          'PropertySets.html#PropertySetsClass' )" ><em>PropertySets</em></a>
        </dt>
        <dd>
          This class provides a number of <span class= "codefrag"
          >ROBitSet</span>s representing many of the sets of
          properties defined in <em>Section 7</em> of the
          specification.  Note that the <a
          href="javascript:parent.displayCode(
          'PropertySets.html#borderProps' )"><em>Border</em></a>, <a
          href="javascript:parent.displayCode(
          'PropertySets.html#paddingProps' )"><em>Padding</em></a> and
          <a href="javascript:parent.displayCode(
          'PropertySets.html#backgroundProps'
          )"><em>Background</em></a> sets are defined separately.
        </dd>
        <dt>
          <a href = "javascript:parent.displayCode(
          '../FOPropertySets.html#FOPropertySetsClass' )"
          ><em>FOPropertySets</em></a>
        </dt>
        <dd>
          This class provides a number of <span class= "codefrag"
          >ROBitSet</span>s representing sets of properties which are
          applicable in particular subtrees of the FO tree.  These
          sets are provided so that other properties can be ignored
          during processing of the subtrees.
        </dd>
        <dt>
          <a href = "javascript:parent.displayCode(
          'ShorthandPropSets.html#ShorthandPropSetsClass' )"
          ><em>ShorthandPropSets</em></a>
        </dt>
        <dd>
          This class contains arrays of <a href =
          "javascript:parent.displayCode(
          'ShorthandPropSets.html#shorthands' )" >shorthand property
          indices</a> and <a href = "javascript:parent.displayCode(
          'ShorthandPropSets.html#compounds' )" >compound property
          indices</a>, and <span class= "codefrag" >ROBitSet</span>s
          representing the expansion sets of these shorthands and
          compounds.  Various methods useful in the expansion of these
          properties are also included.
        </dd>
        <dt>
          <a href = "javascript:parent.displayCode(
          'FOAttributes.html#FOAttributesClass' )"
          ><em>FOAttributes</em></a>
        </dt>
        <dd>
          This class manages the attribute set that is associated with
          a SAX <span class= "codefrag" >startElement</span> event.
          <em>fo:</em> namespace attributes are entered into a <a href
          = "javascript:parent.displayCode(
          'FOAttributes.html#foAttrMap' )"><span class= "codefrag"
          >HashMap</span></a>, indexed by the <em>fo:</em> property
          index.  As other namespaces are encountered, the values are
          entered into namespace-specific <a href =
          "javascript:parent.displayCode(
          'FOAttributes.html#nSpaceAttrMaps' )"><span class=
          "codefrag" >HashMap</span>s</a>, indexed by the <em>local
          name</em> of the attribute.
        </dd>
      </dl>
      <a name= "N100AC" ></a><a name= "property-classes" ></a>
      <h4>org.apache.fop.fo.properties</h4>
      <dl>
        <dt>
          <a href="javascript:parent.displayCode(
          'Property.html#PropertyClass' )" ><em>Property</em></a>
        </dt>
        <dd>
          The base class for all individual property classes.
          There are 320 properties in all.
        </dd>
        <dt>
          <em>ColumnNumber</em>
        </dt>
        <dd>
          The actual property class with the lowest index
          number, followed in the index order by properties required
          for further processing, e.g. FontSize.
        </dd>
        <dt>
          <em>....</em>
        </dt>
        <dd>....</dd>
        <dt>
          <em>Background</em>
        </dt>
        <dd>
          First in index order of the remainining shorthand
          properties, followed in index order by all other remaining
          shorthands.
        </dd>
        <dt>
          <em>....</em>
        </dt>
        <dd>....</dd>
        <dt>
          <em>AbsolutePosition</em>
        </dt>
        <dd>
          First in index order of the remaining properties.  Within
          this ordering, compound properties precede their expansion
          properties, and corresponding relative properties precede
          corresponding absolute properties.
        </dd>
        <dt>
          <em>....</em>
        </dt>
        <dd>....</dd>
        <dt>
          <em>ZIndex</em>
        </dt>
        <dd>
          The property class with the highest index
          number.
        </dd>
      </dl>
      <a name= "N100EE" ></a>
      <h4>org.apache.fop.fo.expr</h4>
      <dl>
        <dt>
          <a href = "javascript:parent.displayCode(
          'PropertyTokenizer.html#PropertyTokenizerClass' )"
          ><em>PropertyTokenizer</em></a>
        </dt>
        <dd>
          The tokenizer for the property expression parser.  Defines a
          set of <a href = "javascript:parent.displayCode(
          'PropertyTokenizer.html#EOF' )" >token constants</a> and
          returns these with associated token values.
        </dd>
        <dt>
          <a href = "javascript:parent.displayCode(
          'PropertyParser.html#PropertyParserClass' )"
          ><em>PropertyParser</em></a>
        </dt>
        <dd>
          This extends <span class= "codefrag"
          >PropertyTokenizer</span>.  It parses property
          expressions on the basis of the tokens passed to it by its
          superclass, generating <span class= "codefrag"
          >PropertyValue</span>s, including <span class= "codefrag"
          >PropertyValueList</span>s.
        </dd>
        <dt>
          <em>PropertyException</em>
        </dt>
        <dd>
          The basic class for all property-related exceptions.
          It extends <span class= "codefrag" >FOPException</span>. It
          is housed in this package by historical accident.
        </dd>
        <dt>
          <em>DataTypeNotImplementedException</em>
          <br>
          <em>FunctionNotImplementedException</em>
          <br>
          <em>PropertyNotImplementedException</em>
        </dt>
        <dd>
          A set of particular exceptions extending <span class=
          "codefrag" >PropertyException</span>.  Also in this package
          by accident.
        </dd>
      </dl>
      <a name= "N10134" ></a>
      <h4>org.apache.fop.datatypes</h4>
      <dl>
        <dt>
          <a href = "javascript:parent.displayCode(
          'PropertyValue.html#PropertyValueInterface' )"
          ><em>PropertyValue</em></a>
        </dt>
        <dd>
          An <em>interface</em> which all <span class= "codefrag"
          >PropertyValue</span> classes must implement.  In addition
          to a few methods, <span class= "codefrag"
          >PropertyValue</span> defines the set of <a href =
          "javascript:parent.displayCode( 'PropertyValue.html#NO_TYPE'
          )" >constants</a> which the <span class= "codefrag"
          >getType()</span> method may return; i.e. the valid set of
          <span class= "codefrag" >PropertyValue</span> types.
        </dd>
        <dt>
          <a href = "javascript:parent.displayCode(
          'AbstractPropertyValue.html#AbstractPropertyValueClass' )"
          ><em>AbstractPropertyValue</em></a>
        </dt>
        <dd>
          An abstract implementation of the <span class= "codefrag"
          >PropertyValue</span> interface.  Most actual property value
          classes extend <span class= "codefrag"
          >AbstractPropertyValue</span>.
        </dd>
        <dt>
          <a href = "javascript:parent.displayCode(
          'PropertyValueList.html#PropertyValueListClass' )"
          ><em>PropertyValueList</em></a>
        </dt>
        <dd>
          This class extends <span class= "codefrag"
          >LinkedList</span> and implements <span class= "codefrag"
          >PropertyValue</span>.  It is used whenever the process of
          resolving a property expression yields a list of <span
          class= "codefrag" >PropertyValue</span> elements; notably
          during the processing of shorthands and "compound"
          properties.
        </dd>
        <dt>
          <em>StringType</em>
        </dt>
        <dd>
          A basic type extending <span class= "codefrag"
          >AbstractPropertyValue</span>.  Extended by <span class=
          "codefrag" >NCName</span>.
        </dd>
        <dt>
          <em>NCName</em>
        </dt>
        <dd>
          Extends <span class= "codefrag" >StringType</span> to represent
          NCName strings.
        </dd>
        <dt>
          <em>EnumType</em>
        </dt>
        <dd>
          Extends <span class= "codefrag"
          >AbstractPropertyValue</span> to represented enumerated
          types.
        </dd>
        <dt>
          <em>Other types</em>
        </dt>
        <dd>
          All other types extend one of the above classes.
        </dd>
      </dl>
      <a name= "N101A2" ></a>
      <h4>org.apache.fop.datatypes.indirect</h4>
      <dl>
        <dt>
          <em>IndirectValue</em>
        </dt>
        <dd>
          The base type for all indirect value types; extends
          <span class= "codefrag" >AbstractPropertyValue</span>.
        </dd>
      </dl>
      <p>
        <strong>Previous:</strong> <a href = "introduction.html"
        >Introduction</a>
      </p>
      <p>
        <strong>Next:</strong> <a href= "PropertyConsts-class.html"
                                     >The PropertyConsts class</a>
      </p>
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