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Groovy example source code file (NumberAwareComparator.java)

This example Groovy source code file (NumberAwareComparator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

classcastexception, classcastexception, comparator, comparator, groovyruntimeexception, groovyruntimeexception, numberawarecomparator, numberawarecomparator, t, util

The Groovy NumberAwareComparator.java source code

/*
 * 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 org.codehaus.groovy.runtime;

import groovy.lang.GroovyRuntimeException;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;

import java.util.Comparator;

/**
 * Compares two objects using Groovy's friendly comparison algorithm, i.e.
 * handles nulls gracefully (nul being less than everything else) and
 * performs numeric type coercion if required.
 */
public class NumberAwareComparator<T> implements Comparator {
    public int compare(T o1, T o2) {
        try {
            return DefaultTypeTransformation.compareTo(o1, o2);
        } catch (ClassCastException cce) {
            /* ignore */
        } catch (GroovyRuntimeException gre) {
            /* ignore */
        }
        // since the object does not have a valid compareTo method
        // we compare using the hashcodes. null cases are handled by
        // DefaultTypeTransformation.compareTo
        int x1 = o1.hashCode();
        int x2 = o2.hashCode();
        if (x1 == x2) return 0;
        if (x1 < x2) return -1;
        return 1;
    }
}

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