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'DatabeneScript' is an open source software library for resolving Java-like script expressions, written by Volker Bergmann.

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/*
 * (c) Copyright 2009-2011 by Volker Bergmann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted under the terms of the
 * GNU General Public License (GPL).
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
 * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
 * HEREBY EXCLUDED. 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.
 */

package org.databene.script.expression;

import java.util.Comparator;

import org.databene.commons.ArrayFormat;
import org.databene.commons.ComparableComparator;
import org.databene.commons.Context;
import org.databene.script.Expression;

/**
 * Calculates the maximum value of several arguments. 
 * null values are ignored 


 * Created: 19.10.2009 01:31:42
 * @since 0.5.0
 * @author Volker Bergmann
 */
public class MaxExpression extends CompositeExpression {

	private Comparator comparator;

	@SuppressWarnings({ "unchecked", "rawtypes" })
    public MaxExpression(Expression... terms) {
	    this(new ComparableComparator(), terms);
    }

	public MaxExpression(Comparator comparator, Expression... terms) {
	    super("", terms);
	    this.comparator = comparator;
    }

    public E evaluate(Context context) {
    	E max = terms[0].evaluate(context);
	    for (int i = 1; i < terms.length; i++) {
	    	E tmp = terms[i].evaluate(context);
	    	if (comparator.compare(tmp, max) > 0)
	    		max = tmp;
	    }
	    return max;
    }

    @Override
    public String toString() {
        return "max(" + ArrayFormat.format(terms) + ')';
    }
    
}