org.jresponder.util.PropUtil.java Source code

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Here is the source code for org.jresponder.util.PropUtil.java

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/**
 * =========================================================================
 *     __ ____   ____  __  ____    ___   __  __ ____    ____ ____ 
 *     || || \\ ||    (( \ || \\  // \\  ||\ || || \\  ||    || \\
 *     || ||_// ||==   \\  ||_// ((   )) ||\\|| ||  )) ||==  ||_//
 *  |__|| || \\ ||___ \_)) ||     \\_//  || \|| ||_//  ||___ || \\
 * =========================================================================
 *
 * Copyright 2012 Brad Peabody
 *
 * 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.jresponder.util;

import java.util.HashMap;
import java.util.Map;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.stereotype.Component;

import net.minidev.json.JSONValue;

/**
 * Utilities related to properties and maps and cool stuff like that.
 * 
 * @author bradpeabody
 *
 */
@Component("jrPropUtil")
public class PropUtil implements InitializingBean {

    /* ====================================================================== */
    /* singleton support with override - boiler plate (see package desc)      */
    private static PropUtil instance;

    public static PropUtil getInstance() {
        return instance;
    }

    public static void setInstance(PropUtil inst) {
        instance = inst;
    }

    public void afterPropertiesSet() {
        setInstance(this);
    }
    /* ====================================================================== */

    /**
     * Merge from the aFromMap to the aIntoMap (dst <- src) (assembly style).
     * Null value in from map causes corresponding entry in dst map to be
     * removed.
     * @param aIntoMap
     * @param aFromMap
     * @return Map returns aIntoMap - in case it helps you chain calls together easier
     */
    public Map<String, Object> propMerge(Map<String, Object> aIntoMap, Map<String, Object> aFromMap) {
        for (String myKey : aFromMap.keySet()) {
            Object myValue = aFromMap.get(myKey);
            if (myValue == null) {
                aIntoMap.remove(myKey);
            } else {
                aIntoMap.put(myKey, myValue);
            }
        }
        return aIntoMap;
    }

    /**
     * Helper method to make a map from the keys and values passed - which are
     * in the form of
     * <code>mkprops(key1, value1, key2, value3, key3, value3, ...)</code>
     * @param args
     * @return
     */
    public Map<String, Object> mkprops(Object... args) {
        if (args.length % 2 != 0) {
            throw new IllegalArgumentException("mkmap must have an even number of arguments - check your code!");
        }
        Map<String, Object> ret = new HashMap<String, Object>();

        for (int i = 0; i < args.length; i += 2) {
            Object myKey = args[i];
            Object myValue = args[i + 1];
            ret.put(myKey.toString(), myValue);
        }

        return ret;
    }

    /**
     * Convert a props string to a Map
     * @param aString
     * @return
     */
    @SuppressWarnings("unchecked")
    public Map<String, Object> propsToMap(String aString) {
        if (aString == null || aString.trim().length() < 1) {
            return null;
        }
        Object myO = JSONValue.parse(aString);
        Map<String, Object> myRet = (Map<String, Object>) myO;
        return myRet;
    }

    /**
     * Convert a props Map to a string
     * @param aMap
     * @return
     */
    public String propsToString(Map<String, Object> aMap) {
        if (aMap == null) {
            return null;
        }
        return JSONValue.toJSONString(aMap);
    }

}