Examples of org.apache.commons.configuration2.interpol.Lookup

Package org.apache.commons.configuration2.interpol

Examples of org.apache.commons.configuration2.interpol.Lookup

org.apache.commons.configuration2.interpol.ConfigurationInterpolator

Definition of an interface for looking up variables during interpolation.

Objects implementing this interface can be assigned a variable prefix and added to a {@link ConfigurationInterpolator} object. Whenever the{@code ConfigurationInterpolator} encounters a property value referencing avariable, e.g. ${prefix:variableName}, it extracts the prefix and finds the matching {@code Lookup} object. Then this object is asked toresolve the variable name and provide the corresponding value.

This interface defines a single method for performing variable lookup. It is passed the name of a variable and has to return the corresponding value. It is of course up to a specific implementation how this is done. If the variable name cannot be resolved, an implementation has to return null.

Note: Implementations must be aware that they can be accessed concurrently. This is for instance the case if a configuration object is read by multiple threads or if a {@code Lookup} object is shared by multiple configurations.
@version $Id: Lookup.java 1624601 2014-09-12 18:04:36Z oheger $ @since 2.0

        {
            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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    {
        parent.addProperty("tablespaces.tablespace.name", "default");
        parent.addProperty("tablespaces.tablespace(-1).name", "test");
        parent.addProperty("tables.table(0).var", "${brackets:x}");


        ConfigurationInterpolator interpolator = parent.getInterpolator();
        interpolator.registerLookup("brackets", new Lookup() {


            public String lookup(String key) {
                return "(" + key + ")";
            }

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     * @param value the value to interpolate
     * @return the value with variables substituted
     */
    protected Object interpolate(Object value)
    {
        ConfigurationInterpolator ci = getInterpolator();
        return (ci != null) ? ci.interpolate(value) : value;
    }

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        boolean success;
        do
        {
            // do this in a loop because the ConfigurationInterpolator
            // instance may be changed by another thread
            ConfigurationInterpolator ciOld = getInterpolator();
            ConfigurationInterpolator ciNew =
                    (ciOld != null) ? ciOld : new ConfigurationInterpolator();
            ciNew.registerLookups(lookups);
            success = interpolator.compareAndSet(ciOld, ciNew);
        } while (!success);
    }

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    public void setDefaultLookups(Collection<? extends Lookup> lookups)
    {
        boolean success;
        do
        {
            ConfigurationInterpolator ciOld = getInterpolator();
            ConfigurationInterpolator ciNew =
                    (ciOld != null) ? ciOld : new ConfigurationInterpolator();
            Lookup confLookup = findConfigurationLookup(ciNew);
            if (confLookup == null)
            {
                confLookup = new ConfigurationLookup(this);
            }
            else
            {
                ciNew.removeDefaultLookup(confLookup);
            }
            ciNew.addDefaultLookups(lookups);
            ciNew.addDefaultLookup(confLookup);
            success = interpolator.compareAndSet(ciOld, ciNew);
        } while (!success);
    }

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    public void setParentInterpolator(ConfigurationInterpolator parent)
    {
        boolean success;
        do
        {
            ConfigurationInterpolator ciOld = getInterpolator();
            ConfigurationInterpolator ciNew =
                    (ciOld != null) ? ciOld : new ConfigurationInterpolator();
            ciNew.setParentInterpolator(parent);
            success = interpolator.compareAndSet(ciOld, ciNew);
        } while (!success);
    }

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     * @since 2.0
     */
    protected void cloneInterpolator(AbstractConfiguration orgConfig)
    {
        interpolator = new AtomicReference<ConfigurationInterpolator>();
        ConfigurationInterpolator orgInterpolator = orgConfig.getInterpolator();
        List<Lookup> defaultLookups = orgInterpolator.getDefaultLookups();
        Lookup lookup = findConfigurationLookup(orgInterpolator, orgConfig);
        if (lookup != null)
        {
            defaultLookups.remove(lookup);
        }


        installInterpolator(orgInterpolator.getLookups(), defaultLookups);
    }

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