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/*
 * Copyright 2008 Open Source Applications Foundation
 * 
 * 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.unitedinternet.cosmo.util;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.commons.lang.StringUtils;

/**
 * Utility methods to process hierarchical String 
 * properties.
 *
 */
public class StringPropertyUtils {
    
    /**
     * Get all child keys of a parent key.  For example
     * for the set of keys: a.b, a.c and a.d the set
     * of child keys of a are [b,c,d].
     * @param parent parent key
     * @param keys keys to search
     * @return child keys
     */
    public static String[] getChildKeys(String parent, String[] keys) {
        HashSet children = new HashSet();
        if(!parent.endsWith(".")) {
            parent = parent + ".";
        }
        for(String key: keys) {
            String end = StringUtils.substringAfter(key, parent);
            if("".equals(end) || end==null) {
                continue;
            }
            
            children.add(StringUtils.substringBefore(end, "."));
        }
        
        return children.toArray(new String[children.size()]);
    }
    
    /**
     * Return a map of child properties.  For example for the
     * map of [a.b.c->foo1, a.b.d->foo2, a.b.e.f->foo3] the map
     * of childKeys for parent a.b is [c->foo1, d->foo2]
     * @param parent parent key
     * @param props properties to search
     * @return map of child properties
     */
    public static Map getChildProperties(String parent, Map props) {
        HashMap childProps = new HashMap();
        if(!parent.endsWith(".")) {
            parent = parent + ".";
        }
        for(Entry entry: props.entrySet()) {
            if(entry.getKey().startsWith(parent)) {
                String end = StringUtils.substringAfter(entry.getKey(), parent);
                if(end!=null && !"".equals(end) && !end.contains(".")) {
                    childProps.put(end, entry.getValue());
                }
                    
            }
        }
        
        return childProps;
    }
    
    /**
     * Return a map of sub properties.  For example for the
     * map of [a.b.c->foo1, a.b.d->foo2, a.b.e.f->foo3] the map
     * of sub properties for parent a.b is [c->foo1, d->foo2, e.f->foo3]
     * @param parent parent key
     * @param props properties to search
     * @return map of child properties
     */
    public static Map getSubProperties(String parent, Map props) {
        HashMap childProps = new HashMap();
        if(!parent.endsWith(".")) {
            parent = parent + ".";
        }
        for(Entry entry: props.entrySet()) {
            if(entry.getKey().startsWith(parent)) {
                String end = StringUtils.substringAfter(entry.getKey(), parent);
                if(end!=null && !"".equals(end)) {
                    childProps.put(end, entry.getValue());
                }
                    
            }
        }
        
        return childProps;
    }
    
    
}