ExpressionUtils.java

/*
 * Copyright 2007 Wilfred Springer
 *
 * 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.agilejava.docbkx.maven;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;

public class ExpressionUtils {

    public final static Map createTree(Properties properties) {
        Map map = new HashMap();
        Iterator iterator = properties.keySet().iterator();
        while (iterator.hasNext()) {
            String key = (String) iterator.next();
            splitToTree(key, properties.get(key), map);
        }
        return map;
    }

    private static void splitToTree(String key, Object object, Map map) {
        int i = key.indexOf('.');
        if (i > 0) {
            String part = key.substring(0, i);
            Map submap = (Map) map.get(part);
            submap = submap == null ? new HashMap() : submap;
            map.put(part, submap);
            splitToTree(key.substring(i + 1), object, submap);
        } else {
            map.put(key, object);
        }
    }

}