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    • com.sun.enterprise.universal.collections.CollectionUtils Maven / Gradle / Ivy

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    /*
 * The contents of this file are subject to the terms 
 * of the Common Development and Distribution License 
 * (the License).  You may not use this file except in
 * compliance with the License.
 * 
 * You can obtain a copy of the license at 
 * https://glassfish.dev.java.net/public/CDDLv1.0.html or
 * glassfish/bootstrap/legal/CDDLv1.0.txt.
 * See the License for the specific language governing 
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL 
 * Header Notice in each file and include the License file 
 * at glassfish/bootstrap/legal/CDDLv1.0.txt.  
 * If applicable, add the following below the CDDL Header, 
 * with the fields enclosed by brackets [] replaced by
 * you own identifying information: 
 * "Portions Copyrighted [year] [name of copyright owner]"
 * 
 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
 */
package com.sun.enterprise.universal.collections;

import java.util.*;

/**
 * all-static methods for handling operations with Collections
 * @author bnevins
 */
public class CollectionUtils {
    private CollectionUtils() {
        
    }
    /**
     * Convert a Properties object, which is a Map into
     * a Map
     * @param p The Properties object to convert
     * @return The converted Map
     */
    public static Map propertiesToStringMap(Properties p)
    {
        Map map = new HashMap();
        Set names = p.keySet();
        
        for(Object name : names) {
            if(name == null) // impossible
                continue;
            
            Object value = p.get(name);
            
            if(value == null)
                map.put(name.toString(), null);
            else
                map.put(name.toString(), value.toString());
        }
        return map;
    }
    
    /**
     * Tired of dumping a String representation of a Map?
     * Then call me!
     * @param map The map to turn into a printable String
     * @return The pretty String 
     */
    public static String toString(Map map) {
        String[] arr = toStringArray(map);
        StringBuilder sb = new StringBuilder();
        
        for(String s : arr) {
            sb.append(s);
            sb.append(EOL);
        }
        return sb.toString();
    }
    
    /**
     * Convert a String[] into a space-delimited String
     * @param arr The String array to convert
     * @return The pretty String 
     */
    public static String toString(String[] arr) {
        StringBuilder sb = new StringBuilder();
        for(String s : arr) {
            sb.append(s);
            sb.append(' ');
        }
        return sb.toString();
    }

    public static String[] toStringArray(Map map) {
        Set set = map.keySet();
        String[] ss = new String[map.size()];
        int i = 0;
        
        for(String name : set) {
            String value = map.get(name);
            String s = name;
            
            if(value != null) {
                s += "=" + value;
            }
            ss[i++] = s;
        }
        return ss;
    }
    private static final String EOL = System.getProperty("line.separator");
}
    
    
    
    

    




    
    
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