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

Package org.apache.commons.configuration2.interpol

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

org.apache.commons.configuration2.interpol.ConfigurationInterpolator
ns.apache.org/lang">Commons Lang. Thus it supports the same syntax of variable expressions.

The basic idea of this class is that it can maintain a set of primitive {@link Lookup} objects, each of which is identified by a special prefix. Thevariables to be processed have the form ${prefix:name}. {@code ConfigurationInterpolator} will extract the prefix and determine,which primitive lookup object is registered for it. Then the name of the variable is passed to this object to obtain the actual value. It is also possible to define an arbitrary number of default lookup objects, which are used for variables that do not have a prefix or that cannot be resolved by their associated lookup object. When adding default lookup objects their order matters; they are queried in this order, and the first non-null variable value is used.

After an instance has been created it does not contain any {@code Lookup}objects. The current set of lookup objects can be modified using the {@code registerLookup()} and {@code deregisterLookup()} methods. Defaultlookup objects (that are invoked for variables without a prefix) can be added or removed with the {@code addDefaultLookup()} and{@code removeDefaultLookup()} methods respectively. (When a{@code ConfigurationInterpolator} instance is created by a configurationobject, a default lookup object is added pointing to the configuration itself, so that variables are resolved using the configuration's properties.)

The default usage scenario is that on a fully initialized instance the {@code interpolate()} method is called. It is passed an object value whichmay contain variables. All these variables are substituted if they can be resolved. The result is the passed in value with variables replaced. Alternatively, the {@code resolve()} method can be called to obtain thevalues of specific variables without performing interpolation.

Implementation node: This class is thread-safe. Lookup objects can be added or removed at any time concurrent to interpolation operations.
@version $Id: ConfigurationInterpolator.java 1624601 2014-09-12 18:04:36Z oheger $ @since 1.4 @author Commons Configuration team

        Map<String, Lookup> prefixLookups = new HashMap<String, Lookup>();
        prefixLookups.put("test", prefixLookup);
        List<Lookup> defLookups = new ArrayList<Lookup>();
        defLookups.add(defLookup);
        config.installInterpolator(prefixLookups, defLookups);
        ConfigurationInterpolator interpolator = config.getInterpolator();
        assertEquals("Wrong prefix lookups", prefixLookups,
                interpolator.getLookups());
        List<Lookup> defLookups2 = interpolator.getDefaultLookups();
        assertEquals("Wrong number of default lookups", 2, defLookups2.size());
        assertSame("Wrong default lookup 1", defLookup, defLookups2.get(0));
        String var = "testVariable";
        Object value = 42;
        config.addProperty(var, value);

View Full Code Here

     *
     * @return the {@code ConfigurationInterpolator}
     */
    protected ConfigurationInterpolator getInterpolator()
    {
        ConfigurationInterpolator result;
        boolean done;


        // This might create multiple instances under high load,
        // however, always the same instance is returned.
        do

View Full Code Here

     * @return the name of the configuration file to be loaded
     */
    protected String constructFileName(
            MultiFileBuilderParametersImpl multiParams)
    {
        ConfigurationInterpolator ci = getInterpolator();
        return String.valueOf(ci.interpolate(multiParams.getFilePattern()));
    }

View Full Code Here

     * @param value the value that is to be interpolated
     * @return the interpolated value
     */
    protected Object interpolate(Object value)
    {
        ConfigurationInterpolator interpolator =
                getConfiguration().getInterpolator();
        return (interpolator != null) ? interpolator.interpolate(value) : value;
    }

View Full Code Here

     *
     * @return the {@code ConfigurationInterpolator}
     */
    private ConfigurationInterpolator initLocalInterpolator()
    {
        ConfigurationInterpolator ci = new ConfigurationInterpolator()
        {
            @Override
            protected Lookup fetchLookupForPrefix(String prefix)
            {
                return ConfigurationInterpolator

View Full Code Here

                        .setListDelimiterHandler(
                                new DefaultListDelimiterHandler(';'));
        MultiFileBuilderParametersImpl params =
                new MultiFileBuilderParametersImpl().setFilePattern(PATTERN)
                        .setManagedBuilderParameters(xmlParams);
        ConfigurationInterpolator ci = createInterpolator();
        params.setInterpolator(ci).setListDelimiterHandler(
                new DefaultListDelimiterHandler('#'));
        builder.configure(params);
        switchToConfig(1);
        XMLConfiguration config = builder.getConfiguration();

View Full Code Here

                new MultiFileBuilderParametersImpl().setFilePattern(PATTERN);
        MultiFileConfigurationBuilder<XMLConfiguration> builder =
                new MultiFileConfigurationBuilder<XMLConfiguration>(
                        XMLConfiguration.class);
        builder.configure(params);
        ConfigurationInterpolator interpolator = builder.getInterpolator();
        assertNotNull("No interpolator", interpolator);
        builder.resetParameters();
        assertNotSame("No new interpolator", interpolator,
                builder.getInterpolator());
    }

View Full Code Here

    {
        DynamicCombinedConfiguration config =
                new DynamicCombinedConfiguration();
        config.setKeyPattern(PATTERN_VAR);
        BasicBuilderParameters params = createTestBuilderParameters(null);
        ConfigurationInterpolator ci = new ConfigurationInterpolator();
        ci.addDefaultLookup(new ConfigurationLookup(config));
        params.setInterpolator(ci);
        MultiFileConfigurationBuilder<XMLConfiguration> builder =
                new MultiFileConfigurationBuilder<XMLConfiguration>(
                        XMLConfiguration.class, null, true);
        builder.configure(params);

View Full Code Here

     *
     * @return the new {@code ConfigurationInterpolator}
     */
    protected static ConfigurationInterpolator createInterpolator()
    {
        ConfigurationInterpolator ci = new ConfigurationInterpolator();
        ci.registerLookup(DefaultLookups.SYSTEM_PROPERTIES.getPrefix(),
                DefaultLookups.SYSTEM_PROPERTIES.getLookup());
        return ci;
    }

View Full Code Here

     * already a {@code ConfigurationInterpolator} is available.
     */
    @Test
    public void testSetParentInterpolatorExistingInterpolator()
    {
        ConfigurationInterpolator parent =
                EasyMock.createMock(ConfigurationInterpolator.class);
        EasyMock.replay(parent);
        AbstractConfiguration config =
                new TestConfigurationImpl(new PropertiesConfiguration());
        ConfigurationInterpolator ci = config.getInterpolator();
        config.setParentInterpolator(parent);
        assertSame("Parent was not set", parent, config.getInterpolator()
                .getParentInterpolator());
        assertSame("Interpolator was changed", ci, config.getInterpolator());
    }

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

Related Classes of org.apache.commons.configuration2.interpol.ConfigurationInterpolator

com.mockobjects.servlet.MockHttpServletRequest

com.mockobjects.servlet.MockServletConfig

org.apache.commons.beanutils.DynaProperty

org.apache.commons.configuration2.AbstractConfiguration

org.apache.commons.configuration2.BaseConfiguration

org.apache.commons.configuration2.beanutils.BeanHelper

org.apache.commons.configuration2.beanutils.ConfigurationDynaBean

org.apache.commons.configuration2.beanutils.XMLBeanDeclaration

org.apache.commons.configuration2.builder.BasicConfigurationBuilder

org.apache.commons.configuration2.builder.combined.CombinedConfigurationBuilder

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.