com.chinamobile.bcbsp.fault.browse.SortList.java Source code

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Here is the source code for com.chinamobile.bcbsp.fault.browse.SortList.java

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/**
 /**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.chinamobile.bcbsp.fault.browse;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * sort the given list according the value returned by the method; and the sort
 * determinate the correct order or reverted order
 * @param E
 *        list to sort
 */
public class SortList<E> {
    /**handle the log in this class*/
    private static final Log LOG = LogFactory.getLog(SortList.class);

    /**
     * sort the given list according the value returned by the method;
     * and the sort
     * determinate the correct order or reverted order
     * @param list
     *        list to sort.
     * @param method
     *        given method to get the value to compare.
     * @param sort
     *        decide the correct order or reverted order
     */
    public void Sort(List<E> list, final String method, final String sort) {
        Collections.sort(list, new Comparator<E>() {
            @Override
            @SuppressWarnings("unchecked")
            public int compare(Object a, Object b) {
                int ret = 0;
                try {
                    Object[] objs = null;
                    Method m1 = ((E) a).getClass().getMethod(method, (Class<?>[]) objs);
                    Method m2 = ((E) b).getClass().getMethod(method, (Class<?>[]) objs);
                    if (sort != null && "desc".equals(sort)) {
                        ret = m2.invoke(((E) b), objs).toString().compareTo(m1.invoke(((E) a), objs).toString());
                    } else {
                        ret = m1.invoke(((E) a), objs).toString().compareTo(m2.invoke(((E) b), objs).toString());
                    }
                } catch (NoSuchMethodException ne) {
                    LOG.error("[Sort]", ne);
                    throw new RuntimeException("[Sort]", ne);
                } catch (IllegalAccessException ie) {
                    throw new RuntimeException("[Sort]", ie);
                } catch (InvocationTargetException it) {
                    throw new RuntimeException("[Sort]", it);
                }
                return ret;
            }
        });
    }
}