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## org.apache.cayenne.ejbql
Interface EJBQLExpression

All Known Subinterfaces:
  Node

All Known Implementing Classes:
  EJBQLAbs, EJBQLAbstractSchemaName, EJBQLAdd, EJBQLAggregate, EJBQLAggregateColumn, EJBQLAll, EJBQLAnd, EJBQLAny, EJBQLAscending, EJBQLAverage, EJBQLBetween, EJBQLBooleanLiteral, EJBQLClassName, EJBQLConcat, EJBQLConstructor, EJBQLConstructorParameter, EJBQLConstructorParameters, EJBQLCount, EJBQLCurrentDate, EJBQLCurrentTime, EJBQLCurrentTimestamp, EJBQLDbPath, EJBQLDecimalLiteral, EJBQLDelete, EJBQLDescending, EJBQLDistinct, EJBQLDivide, EJBQLEquals, EJBQLEscapeCharacter, EJBQLExists, EJBQLFrom, EJBQLFromItem, EJBQLGreaterOrEqual, EJBQLGreaterThan, EJBQLGroupBy, EJBQLHaving, EJBQLIdentificationVariable, EJBQLIdentifier, EJBQLIn, EJBQLInnerFetchJoin, EJBQLInnerJoin, EJBQLIntegerLiteral, EJBQLIsEmpty, EJBQLIsNull, EJBQLJoin, EJBQLLength, EJBQLLessOrEqual, EJBQLLessThan, EJBQLLike, EJBQLLocate, EJBQLLower, EJBQLMax, EJBQLMemberOf, EJBQLMin, EJBQLMod, EJBQLMultiply, EJBQLNamedInputParameter, EJBQLNegative, EJBQLNot, EJBQLNotEquals, EJBQLOr, EJBQLOrderBy, EJBQLOrderByItem, EJBQLOuterFetchJoin, EJBQLOuterJoin, EJBQLPath, EJBQLPatternValue, EJBQLPositionalInputParameter, EJBQLSelect, EJBQLSelectClause, EJBQLSelectExpression, EJBQLSelectExpressions, EJBQLSize, EJBQLSqrt, EJBQLStringLiteral, EJBQLSubselect, EJBQLSubstring, EJBQLSubtract, EJBQLSum, EJBQLTok, EJBQLTrim, EJBQLTrimBoth, EJBQLTrimCharacter, EJBQLTrimLeading, EJBQLTrimSpecification, EJBQLTrimTrailing, EJBQLUpdate, EJBQLUpdateField, EJBQLUpdateItem, EJBQLUpdateValue, EJBQLUpper, EJBQLWhere, SimpleNode

    public interface EJBQLExpression

An abstract EJBQL expression interface.

Since:
  3.0

Method Summary
`EJBQLExpression` | `getChild(int index)` Returns a child expression node at the specified index.
`int` | `getChildrenCount()` Returns a number of child operands of this expression node.
`String` | `getText()` Returns a text property of the node.
`boolean` | `isNegated()` Returns an optional boolean flag that negates the value of the expression.
`void` | `visit(EJBQLExpressionVisitor visitor)` Accepts a visitor, calling appropriate visitor method.

Method Detail

### visit

    void visit(EJBQLExpressionVisitor visitor)

  Accepts a visitor, calling appropriate visitor method. If the visitor method returns true, visits all children, otherwise stops.

### getChildrenCount

    int getChildrenCount()

  Returns a number of child operands of this expression node.

### getChild

    EJBQLExpression getChild(int index)

  Returns a child expression node at the specified index.

### getText

    String getText()

  Returns a text property of the node.

### isNegated

    boolean isNegated()

  Returns an optional boolean flag that negates the value of the expression.

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