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java.lang.Objectorg.geotools.expr.AbstractExpr
org.geotools.expr.MetadataExpr
Retrive attribute from Feature.
This is a start of an Expr chain - I would rather setup Expr.attribute( path ) if I can figure out how.
Field Summary | |
protected FilterFactory |
factory
|
Constructor Summary | |
MetadataExpr(java.lang.String xpath)
|
Method Summary | |
Expr |
and(Expr expr)
Explicit Expr chain extention - required for custom Expressions. |
Expr |
bbox(com.vividsolutions.jts.geom.Envelope bbox)
Convience method for: geom().disjoint( geom( bbox )).not() |
Expr |
between(Expr min,
Expr max)
min <= expr <= max |
Expr |
eq(Expr expr)
expr == expr |
Expr |
eval()
Evaludate Expr - with LiteralExpr as a goal. |
Expression |
expression(FeatureType schema)
Turns a Filter into an a logical true/false expression. |
Expr |
fid(java.util.Set fids)
expr.filter( fids ) Restruct current Expr to provided featureId(s). |
Expr |
fid(java.lang.String featureID)
Convience method for accessing a single fid |
Filter |
filter(FeatureType schema)
Useful super class that casts expressions into a Filter. |
Expr |
fn(java.lang.String name)
name( expr ) |
Expr |
fn(java.lang.String name,
Expr expr)
name( expr, expr ) |
Expr |
fn(java.lang.String name,
Expr[] expr)
name( expr[0], expr[0], ... ) |
Expr |
gt(Expr expr)
expr > expr |
Expr |
gte(Expr expr)
expr >= expr |
Expr |
lt(Expr expr)
expr < expr |
Expr |
lte(Expr expr)
expr <= expr |
Expr |
ne(Expr expr)
expr ! |
Expr |
not()
! |
Expr |
notNull()
expr ! |
Expr |
or(Expr expr)
Expr Disjunction |
Expr |
reduce(java.lang.String bind)
Reduce attributes matching "bind/x" to "x". |
Expr |
resolve(org.opengis.catalog.MetadataEntity metadata)
Bind all meta entries according to provided metadata. |
Expr |
resolve(java.lang.String bind,
Feature feature)
Bind attributes matching "bind/x" to feature.getAttribute("x"). |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
protected FilterFactory factory
Constructor Detail |
public MetadataExpr(java.lang.String xpath)
Method Detail |
public Expr resolve(org.opengis.catalog.MetadataEntity metadata)
org.geotools.expr.AbstractExpr
Feature
metadata
-
public Expression expression(FeatureType schema)
org.geotools.expr.AbstractExpr
public Expr resolve(java.lang.String bind, Feature feature)
org.geotools.expr.AbstractExpr
This may be used to reduce an Expr as part of an otter join, to something simple that can be passed off to an DataStore by way of filter( FeatureType ).
bind
- feature
-
public Expr reduce(java.lang.String bind)
org.geotools.expr.AbstractExpr
This may be used to reduce an Expr as part of an otter join, to something simple that can be passed off to an DataStore by way of filter( FeatureType ).
Example:
FeatureType RIVER = river.getSchema();
FeatureType HAZZARD = hazard.getSchema();
Expr joinExpr = Exprs.attribute("river/name").eq( Exprs.attribute("hazzard/river") );
FeatureReader outer = river.getFeatures().reader();
while( reader.hasNext() ){
Feature aRiver = outer.next();
Expr inner = joinExpr.resolve( "river", aRiver ).reduce( "hazzard" );
FeatureReader inner = district.getFeatures( inner.filter( HAZZARD ) );
while( inner.hasNext() ){
Feature aHazzard = inner.next();
// code here has access to both aRiver and aHazzard
}
inner.close();
}
outer.close();
public Expr eval()
By default this method simply returns the current Expr.
eval
in interface Expr
public Filter filter(FeatureType schema) throws java.io.IOException
To turn Expression into a Filter I am going to follow the usual Perl defaults of "true".
filter
in interface Expr
java.io.IOException
public Expr bbox(com.vividsolutions.jts.geom.Envelope bbox)
bbox
in interface Expr
public Expr fid(java.lang.String featureID)
fid
in interface Expr
public Expr fid(java.util.Set fids)
Expr
Restruct current Expr to provided featureId(s).
fid
in interface Expr
public Expr not()
Expr
Invert of logical TRUTH value. Can be used to test for non contained fitler contents or FALSE Expressions
not
in interface Expr
public Expr and(Expr expr)
Expr
and
in interface Expr
expr
-
public Expr or(Expr expr)
Expr
or
in interface Expr
public Expr eq(Expr expr)
Expr
eq
in interface Expr
public Expr gt(Expr expr)
Expr
gt
in interface Expr
public Expr gte(Expr expr)
Expr
gte
in interface Expr
public Expr lt(Expr expr)
Expr
lt
in interface Expr
public Expr lte(Expr expr)
Expr
lte
in interface Expr
public Expr ne(Expr expr)
Expr
ne
in interface Expr
public Expr between(Expr min, Expr max)
Expr
between
in interface Expr
public Expr notNull()
Expr
notNull
in interface Expr
public Expr fn(java.lang.String name)
Expr
fn
in interface Expr
public Expr fn(java.lang.String name, Expr expr)
Expr
fn
in interface Expr
public Expr fn(java.lang.String name, Expr[] expr)
Expr
fn
in interface Expr
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