Expression

com.google.appengine.api.search.dev

Class Expression

• java.lang.Object
• • com.google.appengine.api.search.dev.Expression

• Direct Known Subclasses:

  ExpressionBuilder.EmptyExpression, ExpressionBuilder.IntValueExpression, FieldExpression, NumericDefaultExpression, SnippetExpression

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  public abstract class Expression
  extends java.lang.Object

  Abstract base class for all expression evaluators.

• • Nested Class Summary

    Nested Classes 

    Modifier and Type	Class and Description
    static interface	Expression.Sorter Sort class for potential multi dimensional sorting of the expression.

  • Constructor Summary

    Constructors 

    Constructor and Description
    Expression()

  • Method Summary

    All Methods Static Methods Instance Methods Abstract Methods Concrete Methods 

    Modifier and Type	Method and Description
    abstract FieldValue	eval(Document doc) Evaluate the expression to field value proto for the specified document.
    abstract java.util.List<Expression.Sorter>	getSorters(int sign, double defaultValueNumeric, java.lang.String defaultValueText) Get list of sort classes for the expression.
    static FieldValue	makeValue(ContentType type, java.lang.String stringValue) Helper function to make field value proto from specified content.

    • Methods inherited from class java.lang.Object

      clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• • Constructor Detail

    • Expression

      public Expression()

  • Method Detail

    • eval

      public abstract FieldValue eval(Document doc)
                               throws EvaluationException

      Evaluate the expression to field value proto for the specified document.

      Throws:

      EvaluationException

    • makeValue

      public static final FieldValue makeValue(ContentType type,
                                               java.lang.String stringValue)

      Helper function to make field value proto from specified content.

    • getSorters

      public abstract java.util.List<Expression.Sorter> getSorters(int sign,
                                                                   double defaultValueNumeric,
                                                                   java.lang.String defaultValueText)

      Get list of sort classes for the expression. Usually it contains just one element, but for field expressions it can potentially return 2 sorters when both numeric and text fields exist with a field name.