Re: Iterate over annotations with multiple types

[Jörn Kottmann]

Isn't this slow? Because it then needs to iterate over every
single AnnotationFS inside my CAS.

Jörn


On 9/7/11 3:06 PM, Richard Eckart de Castilho wrote:

Hi Jörn,

what is the best way to iterate over annotations which have
different types?

you can use a filtered iterator - more or less like this:

                CAS cas = jcas.getCas();
                ConstraintFactory cf = ConstraintFactory.instance();
                FSIterator<Annotation>  iterator = 
jcas.getAnnotationIndex().iterator();
                Type tokenType = jcas.getCasType(Token.type);
                Type sentenceType = jcas.getCasType(Sentence.type);

                // Restrict to Tokens
                FSTypeConstraint typeConstraint1 = cf.createTypeConstraint();
                typeConstraint.add(tokenType);

                // Restrict to Tokens
                FSTypeConstraint typeConstraint2 = cf.createTypeConstraint();
                typeConstraint.add(sentenceType);

                // Combine both constraints using "or"
                FSMatchConstraint disjunction = cf.or(typeConstraint1, 
typeConstraint2);

                // Create and use the filtered iterator
                FSIterator<Annotation>  filteredIterator = 
cas.createFilteredIterator(iterator, disjunction);
                while(filteredIterator.hasNext()) {
                        
System.out.println(filteredIterator.next().getCoveredText());
                }

Cheers,

Richard