AbstractOperator (DSpace Kernel :: API and Implementation 7.1.1 API)

java.lang.Object
- org.dspace.content.logic.operator.AbstractOperator

All Implemented Interfaces:

LogicalStatement

Direct Known Subclasses:

And, Nand, Nor, Or
```
public abstract class AbstractOperator
extends Object
implements LogicalStatement
```
Abstract class for an operator. An operator contains a list of logical statements (conditions or more operators) and depending on the kind of operator (AND, OR, NOT, etc.) the results of some or all sub-statements are evaluated and returned as a logical result

Version:

$Revision$

Author:

Kim Shepherd

Constructor Summary

Constructors
Constructor	Description
`AbstractOperator()`	Default constructor
`AbstractOperator(List<LogicalStatement> statements)`	Constructor to create operator from some predefined statements

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`getResult(Context context, Item item)`	Get the result of logical evaluation for an item
`List<LogicalStatement>`	`getStatements()`	Get sub-statements for this operator
`void`	`setStatements(List<LogicalStatement> statements)`	Set sub-statements for this operator, as defined in item-filters.xml

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AbstractOperator
```
public AbstractOperator()
```
    Default constructor
  - AbstractOperator
```
public AbstractOperator(List<LogicalStatement> statements)
```
    Constructor to create operator from some predefined statements
    
    Parameters:
    
    statements -
- Method Detail
  - getStatements
```
public List<LogicalStatement> getStatements()
```
    Get sub-statements for this operator
    
    Returns:
    
    list of sub-statements
  - setStatements
```
public void setStatements(List<LogicalStatement> statements)
```
    Set sub-statements for this operator, as defined in item-filters.xml
    
    Parameters:
    
    statements - list of logical statements
  - getResult
```
public boolean getResult(Context context,
                         Item item)
                  throws LogicalStatementException
```
    Description copied from interface: LogicalStatement
    
    Get the result of logical evaluation for an item
    
    Specified by:
    
    getResult in interface LogicalStatement
    
    Parameters:
    
    context - DSpace context
    
    item - Item to evaluate
    
    Returns:
    
    boolean result of evaluation (of sub-statements)
    
    Throws:
    
    LogicalStatementException