org.unitedinternet.cosmo.util.StringPropertyUtils.java Source code

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Here is the source code for org.unitedinternet.cosmo.util.StringPropertyUtils.java

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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<String> children = new HashSet<String>();
        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<String, String> getChildProperties(String parent, Map<String, String> props) {
        HashMap<String, String> childProps = new HashMap<String, String>();
        if (!parent.endsWith(".")) {
            parent = parent + ".";
        }
        for (Entry<String, String> 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<String, String> getSubProperties(String parent, Map<String, String> props) {
        HashMap<String, String> childProps = new HashMap<String, String>();
        if (!parent.endsWith(".")) {
            parent = parent + ".";
        }
        for (Entry<String, String> 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;
    }

}