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/*
 * Copyright 2003-2010 the original author or authors.
 *
 * 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 groovy.util;

import groovy.lang.Closure;
import org.codehaus.groovy.runtime.NumberAwareComparator;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

/**
 * A helper class for sorting objects via a closure to return the field
 * or operation on which to sort.
 * 
 * @author James Strachan
 * @version $Revision$
 */
public class OrderBy implements Comparator {

    private final List closures;
    private boolean equalityCheck;
    private final NumberAwareComparator numberAwareComparator = new NumberAwareComparator();

    public OrderBy() {
        this.closures = new ArrayList();
    }

    public OrderBy(Closure closure) {
        this();
        closures.add(closure);
    }

    public OrderBy(List closures) {
        this.closures = closures;
    }

    public void add(Closure closure) {
        closures.add(closure);
    }

    public int compare(T object1, T object2) {
        for (Closure closure : closures) {
            Object value1 = closure.call(object1);
            Object value2 = closure.call(object2);
            int result;
            if (!equalityCheck || (value1 instanceof Comparable && value2 instanceof Comparable)) {
                result = numberAwareComparator.compare(value1, value2);
            } else {
                result = DefaultTypeTransformation.compareEqual(value1, value2) ? 0 : -1;
            }
            if (result == 0) continue;
            return result;
        }
        return 0;
    }

    public boolean isEqualityCheck() {
        return equalityCheck;
    }

    public void setEqualityCheck(boolean equalityCheck) {
        this.equalityCheck = equalityCheck;
    }
}
    

    

    

            

    

            



    
    






    
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