Examples of org.geotools.data.Join

org.geotools.data.Join

Represents the joining of two feature types within a {@link Query}.

The Join class is similar to Query in that it allows one to specify a FeatureType name, a set of properties, and a filter. A Join must specify:

A type name that references the feature type to join to, see {@link #getTypeName()}
A join filter that describes how to join, see {@link #getJoinFilter()}

Optionally a Join may also specify:

A set of property names constraining the attributes of joined features, see {@link #getProperties()}
A secondary filter used to constrained features from the joined feature type, see {@link #getFilter()}
An alias for the joined feature type, which can be used in the join filter to disambiguate attributes of the feature types being joined, see {@link #getAlias()}
A join type specifying what type of join (inner, outer, etc...) should be performed, see {@link #getType()}

@author Justin Deoliveira, OpenGeo @since 8.0

        assertEquals(ff.equals(ff.property("FID"), ff.literal("Forests.10")), primary);


        List<Join> joins = visitor.getJoins();
        assertEquals(2, joins.size());


        Join j1 = joins.get(0);
        assertEquals("Lakes", j1.getTypeName());
        assertEquals("a", j1.getAlias());
        assertEquals(ff.equals(ff.property("a.FID"), ff.property("b.FID")), j1.getJoinFilter());
        assertEquals(ff.equals(ff.property("FID"), ff.literal("Lakes.10")), j1.getFilter());


        Join j2 = joins.get(1);
        assertEquals("Buildings", j2.getTypeName());
        assertEquals("c", j2.getAlias());
        assertEquals(ff.equals(ff.property("b.FID"), ff.property("c.FID")), j2.getJoinFilter());
        assertEquals(ff.equals(ff.property("FID"), ff.literal("Buildings.10")), j2.getFilter());
    }

        assertNull(primary);


        List<Join> joins = visitor.getJoins();
        assertEquals(2, joins.size());


        Join j1 = joins.get(0);
        assertEquals("Forests", j1.getTypeName());
        assertEquals("a", j1.getAlias());
        assertEquals(ff.equals(ff.property("a.FID"), ff.property("b.FID")), j1.getJoinFilter());


        Join j2 = joins.get(1);
        assertEquals("Lakes", j2.getTypeName());
        assertEquals("c", j2.getAlias());
        assertEquals(ff.equals(ff.property("b.FID"), ff.property("c.FID")), j2.getJoinFilter());
    }

Examples of org.geotools.data.Join

Related Classes of org.geotools.data.Join