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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.endpoints.utils;
import java.util.Properties;
import org.apache.commons.lang3.StringUtils;
/**
* Utilities for extracting property values and converting them to other types.
*/
public class PropertyUtils {
/**
* Properties on which to work.
*/
private Properties properties;
/**
* Prefix to prepend to property names.
*/
private String prefix;
/**
* Function to invoke if a property value is invalid.
*/
private TriConsumer<String, String, Exception> invalidHandler;
/**
* Constructs the object.
*
* @param properties properties on which to work
* @param prefix prefix to prepend to property names
* @param invalidHandler function to invoke if a property value is invalid
*/
public PropertyUtils(Properties properties, String prefix, TriConsumer<String, String, Exception> invalidHandler) {
this.properties = properties;
this.prefix = prefix;
this.invalidHandler = invalidHandler;
}
/**
* Gets a string property.
*
* @param propName name of the property whose value is to be retrieved
* @param defaultValue value to use if the property value is empty or does not exist
* @return the property's value
*/
public String getString(String propName, String defaultValue) {
String propValue = getProperty(propName);
return (StringUtils.isBlank(propValue) ? defaultValue : propValue);
}
/**
* Gets a boolean property.
*
* @param propName name of the property whose value is to be retrieved
* @param defaultValue value to use if the property value is empty or does not exist
* @return the property's value
*/
public boolean getBoolean(String propName, boolean defaultValue) {
String propValue = getProperty(propName);
if (!StringUtils.isBlank(propValue)) {
return Boolean.parseBoolean(propValue);
}
return defaultValue;
}
/**
* Gets an integer property.
*
* @param propName name of the property whose value is to be retrieved
* @param defaultValue value to use if the property value is empty or does not exist
* @return the property's value
*/
public int getInteger(String propName, int defaultValue) {
String propValue = getProperty(propName);
if (!StringUtils.isBlank(propValue)) {
try {
return Integer.parseInt(propValue);
} catch (NumberFormatException nfe) {
invalidHandler.accept(getFullName(propName), propValue, nfe);
}
}
return defaultValue;
}
/**
* Gets a property's value.
*
* @param propName name of the property whose value is to be retrieved
* @return the property's value, or {@code null} if it does not exist
*/
private String getProperty(String propName) {
return properties.getProperty(getFullName(propName));
}
/**
* Gets the full property name, with the prefix prepended.
*
* @param propName property name, without the prefix
* @return the full property name
*/
private String getFullName(String propName) {
return prefix + propName;
}
@FunctionalInterface
public static interface TriConsumer<A,B,C> {
public void accept(A propName, B propValue, C exception);
}
}
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