common/src/main/java/org/apache/atlas/utils/PropertiesUtil.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.atlas.utils;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;

/**
 * Util class for Properties.
 */
public final class PropertiesUtil extends PropertyPlaceholderConfigurer {
    private static Map<String, String> propertiesMap = new HashMap<>();
    private static Logger logger = LoggerFactory.getLogger(PropertiesUtil.class);
    protected List<String> xmlPropertyConfigurer = new ArrayList<>();

    private PropertiesUtil() {

    }

    @Override
    protected void processProperties(ConfigurableListableBeanFactory beanFactory, Properties props) {

        Properties sysProps = System.getProperties();
        if (sysProps != null) {
            for (String key : sysProps.stringPropertyNames()) {
                String value = sysProps.getProperty(key);
                if (value != null) {
                    value = value.trim();
                }
                propertiesMap.put(key, value);
            }
        }

        if (props != null) {
            for (String key : props.stringPropertyNames()) {
                String value = props.getProperty(key);
                if (value != null) {
                    value = value.trim();
                }
                propertiesMap.put(key, value);
            }
        }

        super.processProperties(beanFactory, props);
    }

    public static String getProperty(String key, String defaultValue) {
        if (key == null) {
            return null;
        }
        String rtrnVal = propertiesMap.get(key);
        if (rtrnVal == null) {
            rtrnVal = defaultValue;
        }
        return rtrnVal;
    }

    public static String getProperty(String key) {
        if (key == null) {
            return null;
        }
        return propertiesMap.get(key);
    }

    public static String[] getPropertyStringList(String key) {
        if (key == null) {
            return null;
        }
        String value = propertiesMap.get(key);
        if (value != null) {
            String[] splitValues = value.split(",");
            String[] returnValues = new String[splitValues.length];
            for (int i = 0; i < splitValues.length; i++) {
                returnValues[i] = splitValues[i].trim();
            }
            return returnValues;
        } else {
            return new String[0];
        }
    }

    public static Integer getIntProperty(String key, int defaultValue) {
        if (key == null) {
            return null;
        }
        String rtrnVal = propertiesMap.get(key);
        if (rtrnVal == null) {
            return defaultValue;
        }
        return Integer.valueOf(rtrnVal);
    }

    public static Integer getIntProperty(String key) {
        if (key == null) {
            return null;
        }
        String rtrnVal = propertiesMap.get(key);
        if (rtrnVal == null) {
            return null;
        }
        return Integer.valueOf(rtrnVal);
    }

    public static boolean getBooleanProperty(String key, boolean defaultValue) {
        if (key == null) {
            return defaultValue;
        }
        String value = getProperty(key);
        if (value == null) {
            return defaultValue;
        }
        return Boolean.parseBoolean(value);
    }
}