Tomcat example source code file (Arrays.java)

This example Tomcat source code file (Arrays.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 - Tomcat tags/keywords

arrayindexoutofboundsexception, arraylist, arraylist, io, iso-8859-1, member, member, memberimpl, string, string, stringbuffer, stringbuffer, stringtokenizer, unable, uniqueid, util

The Tomcat Arrays.java source code

/*
 * 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 org.apache.catalina.tribes.util;

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

import org.apache.catalina.tribes.ChannelMessage;
import org.apache.catalina.tribes.Member;
import org.apache.catalina.tribes.UniqueId;
import org.apache.catalina.tribes.group.AbsoluteOrder;
import org.apache.catalina.tribes.membership.MemberImpl;
import org.apache.catalina.tribes.membership.Membership;
import java.io.UnsupportedEncodingException;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import java.util.StringTokenizer;

/**
 * @author Filip Hanik
 * @version 1.0
 */
public class Arrays {
    protected static Log log = LogFactory.getLog(Arrays.class);
    
    public static boolean contains(byte[] source, int srcoffset, byte[] key, int keyoffset, int length) {
        if ( srcoffset < 0 || srcoffset >= source.length) throw new ArrayIndexOutOfBoundsException("srcoffset is out of bounds.");
        if ( keyoffset < 0 || keyoffset >= key.length) throw new ArrayIndexOutOfBoundsException("keyoffset is out of bounds.");
        if ( length > (key.length-keyoffset) ) throw new ArrayIndexOutOfBoundsException("not enough data elements in the key, length is out of bounds.");
        //we don't have enough data to validate it
        if ( length > (source.length-srcoffset) ) return false;
        boolean match = true;
        int pos = keyoffset;
        for ( int i=srcoffset; match && i<length; i++ ) {
            match = (source[i] == key[pos++]);
        }
        return match;
    }
    
    public static String toString(byte[] data) {
        return toString(data,0,data!=null?data.length:0);
    }

    public static String toString(byte[] data, int offset, int length) {
        StringBuffer buf = new StringBuffer("{");
        if ( data != null && length > 0 ) {
            buf.append(data[offset++]);
            for (int i = offset; i < length; i++) {
                buf.append(", ").append(data[i]);
            }
        }
        buf.append("}");
        return buf.toString();
    }
    
    public static String toString(Object[] data) {
        return toString(data,0,data!=null?data.length:0);
    }
    
    public static String toString(Object[] data, int offset, int length) {
        StringBuffer buf = new StringBuffer("{");
        if ( data != null && length > 0 ) {
            buf.append(data[offset++]);
            for (int i = offset; i < length; i++) {
                buf.append(", ").append(data[i]);
            }
        }
        buf.append("}");
        return buf.toString();
    }
    
    public static String toNameString(Member[] data) {
        return toNameString(data,0,data!=null?data.length:0);
    }
    
    public static String toNameString(Member[] data, int offset, int length) {
        StringBuffer buf = new StringBuffer("{");
        if ( data != null && length > 0 ) {
            buf.append(data[offset++].getName());
            for (int i = offset; i < length; i++) {
                buf.append(", ").append(data[i].getName());
            }
        }
        buf.append("}");
        return buf.toString();
    }

    public static int add(int[] data) {
        int result = 0;
        for (int i=0;i<data.length; i++ ) result += data[i];
        return result;
    }
    
    public static UniqueId getUniqudId(ChannelMessage msg) {
        return new UniqueId(msg.getUniqueId());
    }

    public static UniqueId getUniqudId(byte[] data) {
        return new UniqueId(data);
    }
    
    public static boolean equals(byte[] o1, byte[] o2) {
        return java.util.Arrays.equals(o1,o2);
    }

    public static boolean equals(Object[] o1, Object[] o2) {
        boolean result = o1.length == o2.length;
        if ( result ) for (int i=0; i<o1.length && result; i++ ) result = o1[i].equals(o2[i]);
        return result;
    }
    
    public static boolean sameMembers(Member[] m1, Member[] m2) {
        AbsoluteOrder.absoluteOrder(m1);
        AbsoluteOrder.absoluteOrder(m2);
        return equals(m1,m2);
    }
    
    public static Member[] merge(Member[] m1, Member[] m2) {
        AbsoluteOrder.absoluteOrder(m1);
        AbsoluteOrder.absoluteOrder(m2);
        ArrayList list = new ArrayList(java.util.Arrays.asList(m1));
        for (int i=0; i<m2.length; i++) if ( !list.contains(m2[i]) ) list.add(m2[i]);
        Member[] result = new Member[list.size()];
        list.toArray(result);
        AbsoluteOrder.absoluteOrder(result);
        return result;
    }
    
    public static void fill(Membership mbrship, Member[] m) {
        for (int i=0; i<m.length; i++ ) mbrship.addMember((MemberImpl)m[i]);
    }
    
    public static Member[] diff(Membership complete, Membership local, MemberImpl ignore) {
        ArrayList result = new ArrayList();
        MemberImpl[] comp = complete.getMembers();
        for ( int i=0; i<comp.length; i++ ) {
            if ( ignore!=null && ignore.equals(comp[i]) ) continue;
            if ( local.getMember(comp[i]) == null ) result.add(comp[i]);
        }
        return (MemberImpl[])result.toArray(new MemberImpl[result.size()]);
    }
    
    public static Member[] remove(Member[] all, Member remove) {
        return extract(all,new Member[] {remove});
    }
    
    public static Member[] extract(Member[] all, Member[] remove) {
        List alist = java.util.Arrays.asList(all);
        ArrayList list = new ArrayList(alist);
        for (int i=0; i<remove.length; i++ ) list.remove(remove[i]);
        return (Member[])list.toArray(new Member[list.size()]);
    }
    
    public static int indexOf(Member member, Member[] members) {
        int result = -1;
        for (int i=0; (result==-1) && (i<members.length); i++ ) 
            if ( member.equals(members[i]) ) result = i;
        return result;
    }
    
    public static int nextIndex(Member member, Member[] members) {
        int idx = indexOf(member,members)+1;
        if (idx >= members.length ) idx = ((members.length>0)?0:-1);
        
//System.out.println("Next index:"+idx);
//System.out.println("Member:"+member.getName());
//System.out.println("Members:"+toNameString(members));
        return idx;
    }
    
    public static int hashCode(byte a[]) {
        if (a == null)
            return 0;

        int result = 1;
        for (int i=0; i<a.length; i++) {
            byte element = a[i];
            result = 31 * result + element;
        }
        return result;
    }
    
    public static byte[] fromString(String value) { 
        if ( value == null ) return null;
        if ( !value.startsWith("{") ) throw new RuntimeException("byte arrays must be represented as {1,3,4,5,6}");
        StringTokenizer t = new StringTokenizer(value,"{,}",false);
        byte[] result = new byte[t.countTokens()];
        for (int i=0; i<result.length; i++ ) result[i] = Byte.parseByte(t.nextToken());
        return result;
    }

    
 
    public static byte[] convert(String s) {
        try {
            return s.getBytes("ISO-8859-1");
        }catch (UnsupportedEncodingException ux ) {
            log.error("Unable to convert ["+s+"] into a byte[] using ISO-8859-1 encoding, falling back to default encoding.");
            return s.getBytes();
        }
    }


    
    
    
}