Package org.exist.xquery.functions.fn

Source Code of org.exist.xquery.functions.fn.FunFloor

/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-2009 The eXist Project
* http://exist-db.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*  $Id$
*/
package org.exist.xquery.functions.fn;

import org.exist.dom.QName;
import org.exist.xquery.Cardinality;
import org.exist.xquery.Dependency;
import org.exist.xquery.Function;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.Profiler;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.FunctionReturnSequenceType;
import org.exist.xquery.value.FunctionParameterSequenceType;
import org.exist.xquery.value.Item;
import org.exist.xquery.value.NumericValue;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceType;
import org.exist.xquery.value.Type;

public class FunFloor extends Function {

  public final static FunctionSignature signature =
    new FunctionSignature(
      new QName("floor", Function.BUILTIN_FUNCTION_NS),
      "Returns the largets number not greater than the value of $number. " +
      "If $number is the empty sequence, returns the empty sequence.",
      new SequenceType[] {
                new FunctionParameterSequenceType("number", Type.NUMBER, Cardinality.ZERO_OR_MORE, "The number")
            },
      new FunctionReturnSequenceType(Type.NUMBER, Cardinality.ONE, "the largets number without fraction part not greater than the value of $number"));

  public FunFloor(XQueryContext context) {
    super(context, signature);
  }

  public int returnsType() {
    return Type.NUMBER;
  }

  public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathException {
        if (context.getProfiler().isEnabled()) {
            context.getProfiler().start(this);
            context.getProfiler().message(this, Profiler.DEPENDENCIES, "DEPENDENCIES", Dependency.getDependenciesName(this.getDependencies()));
            if (contextSequence != null)
                {context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT SEQUENCE", contextSequence);}
            if (contextItem != null)
                {context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT ITEM", contextItem.toSequence());}
        }
       
    //if (contextItem != null)
    //  contextSequence = contextItem.toSequence();
       
    Sequence result;
        final Sequence seq = getArgument(0).eval(contextSequence, contextItem);
    if (seq.isEmpty())
            {result = Sequence.EMPTY_SEQUENCE;}
        else {
          final Item item = seq.itemAt(0);
          NumericValue value;
          if (item instanceof NumericValue) {
        value = (NumericValue) item;
      } else {
        value = (NumericValue) item.convertTo(Type.NUMBER);
      }
        result = value.floor();
        }
       
        if (context.getProfiler().isEnabled())
            {context.getProfiler().end(this, "", result);}
       
        return result;   
       
  }
}
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