Examples of org.apache.commons.configuration2.builder.fluent.Configurations

Package org.apache.commons.configuration2.builder.fluent

Examples of org.apache.commons.configuration2.builder.fluent.Configurations

org.apache.commons.configuration2.ex.ConversionException
A convenience class which simplifies the creation of standard configurations and their builders.

Complex initializations of configuration builders can be done in a pretty straight-forward way by making use of the provided fluent API. However, if only default settings are used (and maybe a configuration file to be loaded has to be specified), this approach tends to become a bit verbose. This class was introduced to simplify the creation of configuration objects in such cases. It offers a bunch of methods which allow the creation of some standard configuration classes with default settings passing in only a minimum required parameters.

An an example consider the creation of a {@code PropertiesConfiguration}object from a file. Using a builder, code like the following one would have to be written:
```
 Parameters params = new Parameters(); FileBasedConfigurationBuilder<PropertiesConfiguration> builder = new FileBasedConfigurationBuilder<PropertiesConfiguration>( PropertiesConfiguration.class).configure(params.fileBased() .setFile(new File("config.properties"))); PropertiesConfiguration config = builder.getConfiguration(); 
```
With a convenience method of {@code Configurations} the same can be achievedwith the following:
```
 Configurations configurations = new Configurations(); PropertiesConfiguration config = configurations.properties(new File( "config.properties")); 
```
There are similar methods for constructing builder objects from which configurations can then be obtained.

This class is thread-safe. A single instance can be created by an application and used in a central way to create configuration objects. When an instance is created a {@link Parameters} instance can be passed in. Otherwise, adefault instance is created. In any case, the {@code Parameters} instanceassociated with a {@code Configurations} object can be used to define defaultsettings for the configurations to be created.
@version $Id: Configurations.java 1624601 2014-09-12 18:04:36Z oheger $ @since 2.0 @see org.apache.commons.configuration2.builder.DefaultParametersManager

        {
            return Collections.singletonList((Object) value.toString());
        }
        else
        {
            throw new ConversionException('\'' + key + "' doesn't map to a List object: " + value + ", a "
                    + value.getClass().getName());
        }
        return list;
    }

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                    defaultValue);
        }
        catch (ConversionException cex)
        {
            // improve error message
            throw new ConversionException(
                    String.format(
                            "Key '%s' cannot be converted to class %s. Value is: '%s'.",
                            key, cls.getName(), String.valueOf(value)));
        }
    }

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        else if (InetAddress.class.isAssignableFrom(cls))
        {
            return toInetAddress(value);
        }


        throw new ConversionException("The value '" + value + "' (" + value.getClass() + ")"
                + " can't be converted to a " + cls.getName() + " object");
    }

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        else if (value instanceof String)
        {
            Boolean b = BooleanUtils.toBooleanObject((String) value);
            if (b == null)
            {
                throw new ConversionException("The value " + value + " can't be converted to a Boolean object");
            }
            return b;
        }
        else
        {
            throw new ConversionException("The value " + value + " can't be converted to a Boolean object");
        }
    }

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        {
            return Character.valueOf(strValue.charAt(0));
        }
        else
        {
            throw new ConversionException(
                    String.format(
                            "The value '%s' cannot be converted to a Character object!",
                            strValue));
        }
    }

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                {
                    return new BigInteger(str.substring(HEX_PREFIX.length()), HEX_RADIX);
                }
                catch (NumberFormatException nex)
                {
                    throw new ConversionException("Could not convert " + str
                            + " to " + targetClass.getName()
                            + "! Invalid hex number.", nex);
                }
            }


            if (str.startsWith(BIN_PREFIX))
            {
                try
                {
                    return new BigInteger(str.substring(BIN_PREFIX.length()), BIN_RADIX);
                }
                catch (NumberFormatException nex)
                {
                    throw new ConversionException("Could not convert " + str
                            + " to " + targetClass.getName()
                            + "! Invalid binary number.", nex);
                }
            }


            try
            {
                Constructor<?> constr = targetClass.getConstructor(CONSTR_ARGS);
                return (Number) constr.newInstance(new Object[]{str});
            }
            catch (InvocationTargetException itex)
            {
                throw new ConversionException("Could not convert " + str
                        + " to " + targetClass.getName(), itex
                        .getTargetException());
            }
            catch (Exception ex)
            {
                // Treat all possible exceptions the same way
                throw new ConversionException(
                        "Conversion error when trying to convert " + str
                                + " to " + targetClass.getName(), ex);
            }
        }
    }

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            {
                return new URL((String) value);
            }
            catch (MalformedURLException e)
            {
                throw new ConversionException("The value " + value + " can't be converted to an URL", e);
            }
        }
        else
        {
            throw new ConversionException("The value " + value + " can't be converted to an URL");
        }
    }

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                return new Locale(language, country, variant);
            }
            else
            {
                throw new ConversionException("The value " + value + " can't be converted to a Locale");
            }
        }
        else
        {
            throw new ConversionException("The value " + value + " can't be converted to a Locale");
        }
    }

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            // check the size of the string
            int minlength = components.length * 2;
            if (color.length() < minlength)
            {
                throw new ConversionException("The value " + value + " can't be converted to a Color");
            }


            // remove the leading #
            if (color.startsWith("#"))
            {
                color = color.substring(1);
            }


            try
            {
                // parse the components
                for (int i = 0; i < components.length; i++)
                {
                    components[i] = Integer.parseInt(color.substring(2 * i, 2 * i + 2), HEX_RADIX);
                }


                // parse the transparency
                int alpha;
                if (color.length() >= minlength + 2)
                {
                    alpha = Integer.parseInt(color.substring(minlength, minlength + 2), HEX_RADIX);
                }
                else
                {
                    alpha = Color.black.getAlpha();
                }


                return new Color(components[0], components[1], components[2], alpha);
            }
            catch (Exception e)
            {
                throw new ConversionException("The value " + value + " can't be converted to a Color", e);
            }
        }
        else
        {
            throw new ConversionException("The value " + value + " can't be converted to a Color");
        }
    }

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            {
                return InetAddress.getByName((String) value);
            }
            catch (UnknownHostException e)
            {
                throw new ConversionException("The value " + value + " can't be converted to a InetAddress", e);
            }
        }
        else
        {
            throw new ConversionException("The value " + value + " can't be converted to a InetAddress");
        }
    }

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