edu.ucsb.adl.middleware
Class Query.SimpleConstraint

java.lang.Object
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  +--edu.ucsb.adl.middleware.Query.Constraint
        |
        +--edu.ucsb.adl.middleware.Query.SimpleConstraint

Direct Known Subclasses:

Query.HierarchicalConstraint, Query.IdentificationConstraint, Query.NumericConstraint, Query.RelationalConstraint, Query.SpatialConstraint, Query.TemporalConstraint, Query.TextualConstraint

Enclosing class:

Query

public abstract static class Query.SimpleConstraint

extends Query.Constraint

Abstract base class for simple (non-boolean) constraints.

Field Summary

protected java.lang.String	m_bucket The bucket to constrain.
protected Query.Field	m_field The field within the bucket to constrain, or null if the constraint is a bucket-level constraint.
protected java.lang.String	m_operator The constraint operator.

Fields inherited from class edu.ucsb.adl.middleware.Query.Constraint

m_parent

Constructor Summary

Query.SimpleConstraint(java.lang.String bucket, Query.Field field, java.lang.String operator)
Constructs a SimpleConstraint.

Method Summary

protected java.lang.String	commonFieldsToXML(int level) Converts common constraint fields to XML.
java.lang.String	getBucket() Returns the constraint bucket.
Query.Field	getField() Returns the constraint field.
java.lang.String	getOperator() Returns the constraint operator.

Methods inherited from class edu.ucsb.adl.middleware.Query.Constraint

getParent, toHTML, toXML

Methods inherited from class java.lang.Object

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

Field Detail

m_bucket

protected java.lang.String m_bucket

The bucket to constrain.

m_field

protected Query.Field m_field

The field within the bucket to constrain, or null if the constraint is a bucket-level constraint.

m_operator

protected java.lang.String m_operator

The constraint operator.

Constructor Detail

Query.SimpleConstraint

public Query.SimpleConstraint(java.lang.String bucket,
                              Query.Field field,
                              java.lang.String operator)

Constructs a SimpleConstraint.

Parameters:

bucket - The bucket to constrain, e.g., "geographic-locations".

field - The field to constrain, or null.

operator - The constraint operator, e.g., "overlaps".

Throws:

java.lang.NullPointerException - If bucket or operator are null, or if field is non-null and field.uri is null.

Method Detail

getBucket

public java.lang.String getBucket()

Returns the constraint bucket.

Returns:

The constraint bucket.

getField

public Query.Field getField()

Returns the constraint field.

Returns:

The constraint field, or null if the constraint is a bucket-level constraint.

getOperator

public java.lang.String getOperator()

Returns the constraint operator.

Returns:

The constraint operator.

commonFieldsToXML

protected java.lang.String commonFieldsToXML(int level)

Converts common constraint fields to XML.

Parameters:

level - The current indentation level; should be nonnegative.

Returns:

An XML fragment.