Examples of org.opengis.filter.Filter.accept()

org.opengis.filter.Filter.accept()
Accepts a visitor.
Implementations of all subinterfaces must have with a method whose content is the following:
```
return visitor. {@linkplain FilterVisitor#visit visit}(this, extraData);
```

    @Test
    public void testSample() throws Exception {
        Filter filter = CQL.toFilter(FilterCQLSample.LESS_FILTER_SAMPLE);
        FilterToCQL toCQL = new FilterToCQL();
        
        String output = filter.accept( toCQL, null ).toString();
        Assert.assertNotNull( output );
        Assert.assertEquals( FilterCQLSample.LESS_FILTER_SAMPLE, output );
    }
    
    @Test

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    protected void cqlTest( String cql ) throws Exception {
        Filter filter = CQL.toFilter(cql);
        Assert.assertNotNull( filter );
        
        FilterToCQL toCQL = new FilterToCQL();
        String output = filter.accept( toCQL, null ).toString();
        Assert.assertEquals( cql,output );        
    }
    
}

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            int j = preStack.size();
          if (filter instanceof Not) {
                
              if (((Not)filter).getFilter() != null) {
                  Filter next = ((Not)filter).getFilter();
          next.accept(this, null);
                  
                  if (i < postStack.size()) {
                    // since and can split filter into both pre and post parts
                    // the parts have to be combined since ~(A^B) == ~A | ~B
                    // combining is easy since filter==combined result however both post and pre stacks

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              if (filter instanceof Or) {
                  Filter orReplacement;
  
                  try {
                      orReplacement = translateOr((Or)filter);
                      orReplacement.accept(this, null);
                  } catch (IllegalFilterException e) {
                    popToSize(preStack,j);
                    postStack.push(filter);
                      return;
                  }

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                    // it's an AND
                    Iterator it = ((And)filter).getChildren().iterator();
                    
                  while (it.hasNext()) {
                      Filter next = (Filter) it.next();
            next.accept(this, null);
                  }
  
                  //combine the unsupported and add to the top
                  if (i < postStack.size()) {
                      if (filter instanceof And) {

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        StringBuilder output = new StringBuilder();
        Iterator<Filter> iter = filterList.iterator();
        while( iter.hasNext() ){
          Filter filter = iter.next();
            filter.accept( toCQL, output );
            if(iter.hasNext() ){
                output.append("; ");
            } 
        }        
        return output.toString();

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     */
    protected Object visit( BinaryLogicOperator filter, Object data ) {
        if (filter.getChildren() != null) {
            for (Iterator<Filter> i = filter.getChildren().iterator(); i.hasNext();) {
                Filter child = i.next();
                child.accept(this, data);
            }
        }
      return filter;
    }

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        String fid1 = "FID.1";
        // not id filter does not actually have a valid encoding 
        Filter filter = factory.not( factory.id( Collections.singleton( factory.featureId(fid1) ) ) );


        FilterEncodingPreProcessor visitor = new FilterEncodingPreProcessor(XMLHandlerHints.VALUE_FILTER_COMPLIANCE_LOW);
        filter.accept(visitor,null);


        assertEquals(filter, visitor.getFilter());
        
        assertTrue(visitor.getFidFilter().getIdentifiers().isEmpty());

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        assertTrue(visitor.getFidFilter().getIdentifiers().isEmpty());


        //Test MEDIUM compliance
        visitor = new FilterEncodingPreProcessor(XMLHandlerHints.VALUE_FILTER_COMPLIANCE_MEDIUM);
        filter.accept(visitor,null);
        
        assertEquals(Filter.INCLUDE, visitor.getFilter());
        assertTrue(visitor.getFidFilter().getIdentifiers().isEmpty());
        assertTrue(visitor.requiresPostProcessing());

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        assertTrue(visitor.getFidFilter().getIdentifiers().isEmpty());
        assertTrue(visitor.requiresPostProcessing());


        //Test HIGH compliance
        visitor = new FilterEncodingPreProcessor(XMLHandlerHints.VALUE_FILTER_COMPLIANCE_HIGH);
        filter.accept(visitor,null);


        assertEquals(Filter.INCLUDE, visitor.getFilter());
        assertTrue(visitor.getFidFilter().getIdentifiers().isEmpty());
        assertTrue(visitor.requiresPostProcessing());
    }

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