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'rapiddweller Script' is an open source software library for resolving Java-like script expressions, forked from Databene Scripts written by Volker Bergmann.

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/*
 * Copyright (C) 2011-2014 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.rapiddweller.script.expression;

import java.util.Comparator;

import com.rapiddweller.commons.ArrayFormat;
import com.rapiddweller.commons.ComparableComparator;
import com.rapiddweller.commons.Context;
import com.rapiddweller.script.Expression;

/**
 * {@link Expression} implementation that calculates the minimum of several values.

 * 

 * Created at 27.07.2009 09:06:36
 * @since 0.5.0
 * @author Volker Bergmann
 */

public class MinExpression extends CompositeExpression {

	private Comparator comparator;

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

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

    @Override
	public E evaluate(Context context) {
    	E min = terms[0].evaluate(context);
	    for (int i = 1; i < terms.length; i++) {
	    	E tmp = terms[i].evaluate(context);
	    	if (min == null)
	    		min = tmp;
	    	else if (tmp != null && comparator.compare(tmp, min) < 0)
	    		min = tmp;
	    }
	    return min;
    }
	
    @Override
    public String toString() {
        return "min(" + ArrayFormat.format(terms) + ')';
    }
    
}