ArrayConcatenateFunction.java example

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* Foundation.
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*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* See the GNU Lesser General Public License for more details.
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package org.pentaho.reporting.libraries.formula.function.userdefined;

import org.pentaho.reporting.libraries.formula.EvaluationException;
import org.pentaho.reporting.libraries.formula.FormulaContext;
import org.pentaho.reporting.libraries.formula.LibFormulaErrorValue;
import org.pentaho.reporting.libraries.formula.function.Function;
import org.pentaho.reporting.libraries.formula.function.ParameterCallback;
import org.pentaho.reporting.libraries.formula.lvalues.TypeValuePair;
import org.pentaho.reporting.libraries.formula.typing.Sequence;
import org.pentaho.reporting.libraries.formula.typing.coretypes.AnyType;
import org.pentaho.reporting.libraries.formula.typing.sequence.RecursiveSequence;

import java.util.ArrayList;

public class ArrayConcatenateFunction implements Function {
  public ArrayConcatenateFunction() {
  }

  public String getCanonicalName() {
    return "ARRAYCONCATENATE";
  }

  public TypeValuePair evaluate( final FormulaContext context,
                                 final ParameterCallback parameters ) throws EvaluationException {
    final ArrayList computedResult = new ArrayList( 512 );
    final int parameterCount = parameters.getParameterCount();

    if ( parameterCount == 0 ) {
      throw EvaluationException.getInstance( LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE );
    }

    for ( int paramIdx = 0; paramIdx < parameterCount; paramIdx++ ) {
      final Object value = parameters.getValue( paramIdx );
      final Sequence sequence = new RecursiveSequence( value, context );

      while ( sequence.hasNext() ) {
        final Object o = sequence.next();
        computedResult.add( o );
      }
    }

    return new TypeValuePair( AnyType.ANY_ARRAY, computedResult.toArray() );
  }
}