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/*
* 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.myfaces.commons.util;
import javax.faces.FacesException;
import javax.faces.context.ExternalContext;
/**
* Utility class to handle web config parameters
*
* @author Leonardo Uribe
* @since 1.0.1
*/
public final class WebConfigParamUtils
{
public final static String[] COMMON_TRUE_VALUES = {"true", "on", "yes"};
public final static String[] COMMON_FALSE_VALUES = {"false", "off", "no"};
/**
* Gets the String init parameter value from the specified context. If the parameter is an empty String or a String
* containing only white space, this method returns null
*
* @param context
* the application's external context
* @param name
* the init parameter's name
*
* @return the parameter if it was specified and was not empty, null otherwise
*
* @throws NullPointerException
* if context or name is null
*/
public static String getStringInitParameter(ExternalContext context, String name)
{
return getStringInitParameter(context,name,null);
}
/**
* Gets the String init parameter value from the specified context. If the parameter is an empty String or a String
* containing only white space, this method returns null
*
* @param context
* the application's external context
* @param name
* the init parameter's name
* @param defaultValue
* the value by default if null or empty
*
* @return the parameter if it was specified and was not empty, null otherwise
*
* @throws NullPointerException
* if context or name is null
*/
public static String getStringInitParameter(ExternalContext context, String name, String defaultValue)
{
if (name == null)
throw new NullPointerException();
String param = context.getInitParameter(name);
if (param == null)
{
return defaultValue;
}
param = param.trim();
if (param.length() == 0)
{
return defaultValue;
}
return param;
}
/**
* Gets the String init parameter value from the specified context. If the parameter is an empty String or a String
* containing only white space, this method returns null
*
* @param context
* the application's external context
* @param names
* the init parameter's names, the first one is scanned first. Usually used when a param has multiple aliases
*
* @return the parameter if it was specified and was not empty, null otherwise
*
* @throws NullPointerException
* if context or name is null
*/
public static String getStringInitParameter(ExternalContext context, String[] names)
{
return getStringInitParameter(context, names, null);
}
/**
* Gets the String init parameter value from the specified context. If the parameter is an empty String or a String
* containing only white space, this method returns null
*
* @param context
* the application's external context
* @param names
* the init parameter's names, the first one is scanned first. Usually used when a param has multiple aliases
* @param defaultValue
* the value by default if null or empty
*
* @return the parameter if it was specified and was not empty, null otherwise
*
* @throws NullPointerException
* if context or name is null
*/
public static String getStringInitParameter(ExternalContext context, String[] names, String defaultValue)
{
if (names == null)
throw new NullPointerException();
String param = null;
for (String name : names)
{
if (name == null)
throw new NullPointerException();
param = context.getInitParameter(name);
if (param != null)
{
break;
}
}
if (param == null)
{
return defaultValue;
}
param = param.trim();
if (param.length() == 0)
{
return defaultValue;
}
return param;
}
/**
* Gets the boolean init parameter value from the specified context. If the parameter was not specified, the default
* value is used instead.
*
* @param context
* the application's external context
* @param name
* the init parameter's name
* @param deprecatedName
* the init parameter's deprecated name.
* @param defaultValue
* the default value to return in case the parameter was not set
*
* @return the init parameter value as a boolean
*
* @throws NullPointerException
* if context or name is null
*/
public static boolean getBooleanInitParameter(ExternalContext context, String name)
{
return getBooleanInitParameter(context, name, false);
}
/**
* Gets the boolean init parameter value from the specified context. If the parameter was not specified, the default
* value is used instead.
*
* @param context
* the application's external context
* @param name
* the init parameter's name
* @param deprecatedName
* the init parameter's deprecated name.
* @param defaultValue
* the default value to return in case the parameter was not set
*
* @return the init parameter value as a boolean
*
* @throws NullPointerException
* if context or name is null
*/
public static boolean getBooleanInitParameter(ExternalContext context, String name, boolean defaultValue)
{
if (name == null)
throw new NullPointerException();
String param = getStringInitParameter(context, name);
if (param == null)
{
return defaultValue;
}
else
{
return Boolean.parseBoolean(param.toLowerCase());
}
}
/**
* Gets the boolean init parameter value from the specified context. If the parameter was not specified, the default
* value is used instead.
*
* @param context
* the application's external context
* @param name
* the init parameter's name
* @param deprecatedName
* the init parameter's deprecated name.
* @param defaultValue
* the default value to return in case the parameter was not set
* @param valuesIgnoreCase
* an array of valid values to match
* @param returnOnValueEqualsIgnoreCase
* the value to return in case the parameter match with valuesIgnoreCase
*
* @return the init parameter value as a boolean
*
* @throws NullPointerException
* if context or name is null
*/
public static boolean getBooleanInitParameter(ExternalContext context, String name, boolean defaultValue, String [] valuesIgnoreCase, boolean returnOnValueEqualsIgnoreCase)
{
if (name == null)
throw new NullPointerException();
String param = getStringInitParameter(context, name);
if (param == null)
{
return defaultValue;
}
else
{
if (valuesIgnoreCase != null)
{
for (String trueValue : valuesIgnoreCase)
{
if (trueValue.equalsIgnoreCase(param))
{
return returnOnValueEqualsIgnoreCase;
}
}
return defaultValue;
}
else
{
return Boolean.parseBoolean(param.toLowerCase());
}
}
}
/**
* Gets the boolean init parameter value from the specified context. If the parameter was not specified, the default
* value is used instead.
*
* @param context
* the application's external context
* @param names
* the init parameter's names
*
* @return the init parameter value as a boolean
*
* @throws NullPointerException
* if context or name is null
*/
public static boolean getBooleanInitParameter(ExternalContext context, String[] names)
{
return getBooleanInitParameter(context, names, false);
}
/**
* Gets the boolean init parameter value from the specified context. If the parameter was not specified, the default
* value is used instead.
*
* @param context
* the application's external context
* @param names
* the init parameter's names
* @param defaultValue
* the default value to return in case the parameter was not set
*
* @return the init parameter value as a boolean
*
* @throws NullPointerException
* if context or name is null
*/
public static boolean getBooleanInitParameter(ExternalContext context, String[] names, boolean defaultValue)
{
if (names == null)
throw new NullPointerException();
String param = null;
for (String name : names)
{
if (name == null)
throw new NullPointerException();
param = getStringInitParameter(context, name);
if (param != null)
{
break;
}
}
if (param == null)
{
return defaultValue;
}
else
{
return Boolean.parseBoolean(param.toLowerCase());
}
}
/**
* Gets the boolean init parameter value from the specified context. If the parameter was not specified, the default
* value is used instead.
*
* @param context
* the application's external context
* @param names
* the init parameter's names
* @param defaultValue
* the default value to return in case the parameter was not set
* @param valuesIgnoreCase
* an array of valid values to match
* @param returnOnValueEqualsIgnoreCase
* the value to return in case the parameter match with valuesIgnoreCase
*
* @return the init parameter value as a boolean
*
* @throws NullPointerException
* if context or name is null
*/
public static boolean getBooleanInitParameter(ExternalContext context, String[] names, boolean defaultValue, String [] valuesIgnoreCase, boolean returnOnValueEqualsIgnoreCase)
{
if (names == null)
throw new NullPointerException();
String param = null;
for (String name : names)
{
if (name == null)
throw new NullPointerException();
param = getStringInitParameter(context, name);
if (param != null)
{
break;
}
}
if (param == null)
{
return defaultValue;
}
else
{
if (valuesIgnoreCase != null)
{
for (String trueValue : valuesIgnoreCase)
{
if (trueValue.equalsIgnoreCase(param))
{
return returnOnValueEqualsIgnoreCase;
}
}
return defaultValue;
}
else
{
return Boolean.parseBoolean(param.toLowerCase());
}
}
}
/**
* Gets the int init parameter value from the specified context. If the parameter was not specified, the default
* value is used instead.
*
* @param context
* the application's external context
* @param name
* the init parameter's name
* @param deprecatedName
* the init parameter's deprecated name.
* @param defaultValue
* the default value to return in case the parameter was not set
*
* @return the init parameter value as a int
*
* @throws NullPointerException
* if context or name is null
*/
public static int getIntegerInitParameter(ExternalContext context, String name)
{
return getIntegerInitParameter(context, name, 0);
}
/**
* Gets the int init parameter value from the specified context. If the parameter was not specified, the default
* value is used instead.
*
* @param context
* the application's external context
* @param name
* the init parameter's name
* @param deprecatedName
* the init parameter's deprecated name.
* @param defaultValue
* the default value to return in case the parameter was not set
*
* @return the init parameter value as a int
*
* @throws NullPointerException
* if context or name is null
*/
public static int getIntegerInitParameter(ExternalContext context, String name, int defaultValue)
{
if (name == null)
throw new NullPointerException();
String param = getStringInitParameter(context, name);
if (param == null)
{
return defaultValue;
}
else
{
return Integer.parseInt(param.toLowerCase());
}
}
/**
* Gets the int init parameter value from the specified context. If the parameter was not specified, the default
* value is used instead.
*
* @param context
* the application's external context
* @param names
* the init parameter's names
*
* @return the init parameter value as a int
*
* @throws NullPointerException
* if context or name is null
*/
public static int getIntegerInitParameter(ExternalContext context, String[] names)
{
return getIntegerInitParameter(context, names, 0);
}
/**
* Gets the int init parameter value from the specified context. If the parameter was not specified, the default
* value is used instead.
*
* @param context
* the application's external context
* @param names
* the init parameter's names
* @param defaultValue
* the default value to return in case the parameter was not set
*
* @return the init parameter value as a int
*
* @throws NullPointerException
* if context or name is null
*/
public static int getIntegerInitParameter(ExternalContext context, String[] names, int defaultValue)
{
if (names == null)
throw new NullPointerException();
String param = null;
for (String name : names)
{
if (name == null)
throw new NullPointerException();
param = getStringInitParameter(context, name);
if (param != null)
{
break;
}
}
if (param == null)
{
return defaultValue;
}
else
{
return Integer.parseInt(param.toLowerCase());
}
}
/**
* Gets the long init parameter value from the specified context. If the parameter was not specified, the default
* value is used instead.
*
* @param context
* the application's external context
* @param name
* the init parameter's name
* @param deprecatedName
* the init parameter's deprecated name.
* @param defaultValue
* the default value to return in case the parameter was not set
*
* @return the init parameter value as a long
*
* @throws NullPointerException
* if context or name is null
*/
public static long getLongInitParameter(ExternalContext context, String name)
{
return getLongInitParameter(context, name, 0);
}
/**
* Gets the long init parameter value from the specified context. If the parameter was not specified, the default
* value is used instead.
*
* @param context
* the application's external context
* @param name
* the init parameter's name
* @param deprecatedName
* the init parameter's deprecated name.
* @param defaultValue
* the default value to return in case the parameter was not set
*
* @return the init parameter value as a long
*
* @throws NullPointerException
* if context or name is null
*/
public static long getLongInitParameter(ExternalContext context, String name, long defaultValue)
{
if (name == null)
throw new NullPointerException();
String param = getStringInitParameter(context, name);
if (param == null)
{
return defaultValue;
}
else
{
return Long.parseLong(param.toLowerCase());
}
}
/**
* Gets the long init parameter value from the specified context. If the parameter was not specified, the default
* value is used instead.
*
* @param context
* the application's external context
* @param names
* the init parameter's names
*
* @return the init parameter value as a long
*
* @throws NullPointerException
* if context or name is null
*/
public static long getLongInitParameter(ExternalContext context, String[] names)
{
return getLongInitParameter(context, names, 0);
}
/**
* Gets the long init parameter value from the specified context. If the parameter was not specified, the default
* value is used instead.
*
* @param context
* the application's external context
* @param names
* the init parameter's names
* @param defaultValue
* the default value to return in case the parameter was not set
*
* @return the init parameter value as a long
*
* @throws NullPointerException
* if context or name is null
*/
public static long getLongInitParameter(ExternalContext context, String[] names, long defaultValue)
{
if (names == null)
throw new NullPointerException();
String param = null;
for (String name : names)
{
if (name == null)
throw new NullPointerException();
param = getStringInitParameter(context, name);
if (param != null)
{
break;
}
}
if (param == null)
{
return defaultValue;
}
else
{
return Long.parseLong(param.toLowerCase());
}
}
/**
* Gets the init parameter value from the specified context and instanciate it. If the parameter was not specified,
* the default value is used instead.
*
* @param context
* the application's external context
* @param name
* the init parameter's name
* @param deprecatedName
* the init parameter's deprecated name.
* @param defaultValue
* the default value to return in case the parameter was not set
*
* @return the init parameter value as an object instance
*
* @throws NullPointerException
* if context or name is null
*/
@SuppressWarnings("unchecked")
public static T getInstanceInitParameter(ExternalContext context, String name, String deprecatedName, T defaultValue)
{
String param = getStringInitParameter(context, name, deprecatedName);
if (param == null)
{
return defaultValue;
}
else
{
try
{
return (T) ClassUtils.classForName(param).newInstance();
}
catch (Exception e)
{
throw new FacesException("Error Initializing Object[" + param + "]", e);
}
}
}
}
