com.moilioncircle.redis.replicator.util.Arrays Maven / Gradle / Ivy

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Redis Replicator implement Redis Replication protocol written in java. It can parse,filter,broadcast the RDB and AOF events in a real time manner. It also can synchronize redis data to your local cache or to database.

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/*
 * Copyright 2016-2018 Leon Chen
 *
 * 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.moilioncircle.redis.replicator.util;

import java.util.HashSet;
import java.util.Set;

/**
 * @author Leon Chen
 * @since 2.2.0
 */
public class Arrays {
    
    public static String deepToString(Object[] obj) {
        return deepToString(obj, "[", "]", ", ");
    }
    
    public static String deepToString(Object[] obj, String st, String ed, String sep) {
        if (obj == null) return "null";
        int bufLen = 20 * obj.length;
        if (obj.length != 0 && bufLen <= 0)
            bufLen = Integer.MAX_VALUE;
        StringBuilder buf = new StringBuilder(bufLen);
        deepToString(obj, buf, new HashSet(), st, ed, sep);
        return buf.toString();
    }
    
    private static void deepToString(Object[] obj, StringBuilder buf, Set set, String st, String ed, String sep) {
        if (obj == null) {
            buf.append("null");
            return;
        }
        int iMax = obj.length - 1;
        if (iMax == -1) {
            buf.append(st).append(ed);
            return;
        }
        
        set.add(obj);
        buf.append(st);
        for (int i = 0; ; i++) {
            Object element = obj[i];
            if (element == null) {
                buf.append("null");
            } else {
                Class eClass = element.getClass();
    
                if (eClass.isArray()) {
                    if (eClass == byte[].class)
                        buf.append(toString((byte[]) element));
                    else if (eClass == char[].class)
                        buf.append(toString((char[]) element));
                    else if (eClass == short[].class)
                        buf.append(java.util.Arrays.toString((short[]) element));
                    else if (eClass == int[].class)
                        buf.append(java.util.Arrays.toString((int[]) element));
                    else if (eClass == long[].class)
                        buf.append(java.util.Arrays.toString((long[]) element));
                    else if (eClass == float[].class)
                        buf.append(java.util.Arrays.toString((float[]) element));
                    else if (eClass == double[].class)
                        buf.append(java.util.Arrays.toString((double[]) element));
                    else if (eClass == boolean[].class)
                        buf.append(java.util.Arrays.toString((boolean[]) element));
                    else { // element is an array of object references
                        if (set.contains(element))
                            buf.append(st).append("...").append(ed);
                        else
                            deepToString((Object[]) element, buf, set, st, ed, sep);
                    }
                } else {  // element is non-null and not an array
                    buf.append(element.toString());
                }
            }
            if (i == iMax) break;
            buf.append(sep);
        }
        buf.append(ed);
        set.remove(obj);
    }
    
    public static String toString(char[] a) {
        if (a == null) return "null";
        int iMax = a.length - 1;
        if (iMax == -1) return "";
        return new String(a);
    }
    
    private static String toString(byte[] a) {
        if (a == null) return "null";
        int iMax = a.length - 1;
        if (iMax == -1) return "";
        return Strings.toString(a);
    }
    
}