package org.hisp.dhis.system.jep;

/*
 * Copyright (c) 2004-2016, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import java.util.List;
import java.util.Stack;
import java.lang.Object;

import org.nfunk.jep.ParseException;
import org.nfunk.jep.function.PostfixMathCommand;
import org.nfunk.jep.function.PostfixMathCommandI;

/**
 * @author Kenneth Haase
 */
public class MedianValue
    extends PostfixMathCommand
    implements PostfixMathCommandI
{
    public MedianValue()
    {
        numberOfParameters = 1;
    }

    // nFunk's JEP run() method uses the raw Stack type
    @SuppressWarnings( { "rawtypes", "unchecked" } )
    public void run( Stack inStack )
        throws ParseException
    {
        checkStack( inStack );

        Object param = inStack.pop();
        List<Double> vals = CustomFunctions.checkVector( param );
        int n = vals.size();
        // Sort it here
        if ( n % 2 == 0 )
        {
            inStack.push( new Double( (vals.get( n / 2 ) + vals.get( n / 2 + 1 )) / 2 ) );
        }
        else
        {
            inStack.push( new Double( vals.get( (n + 1) / 2 ) ) );
        }
    }
}

@@ -1586,16 +1586,46 @@
 E.%0A */%0A%0A
+import java.util.Collections;%0A
 import j
@@ -2383,23 +2383,33 @@
     
-// Sort it here
+Collections.sort( vals );
 %0A   
@@ -2480,16 +2480,17 @@
 ouble( (
+ 
 vals.get
@@ -2497,16 +2497,20 @@
 ( n / 2 
+- 1 
 ) + vals
@@ -2525,13 +2525,10 @@
 / 2 
-+ 1 
 )
+ 
 ) / 
@@ -2619,15 +2619,9 @@
 et( 
-(n + 1)
+n
  / 2

Fix predictor median function DHIS2-1884 (#2237)