Example usage for java.util.prefs Preferences nodeExists

Introduction

In this page you can find the example usage for java.util.prefs Preferences nodeExists.

Prototype

public abstract boolean nodeExists(String pathName) throws BackingStoreException;

Source Link

Document

Returns true if the named preference node exists in the same tree as this node.

Usage

From source file:org.pentaho.reporting.ui.datasources.jdbc.connection.JdbcConnectionDefinitionManager.java

/**
 * package-local visibility for testing purposes
 *///from  w  w w .j  a va  2s  .  c  om
JdbcConnectionDefinitionManager(final Preferences externalPreferences, final String node) {
    userPreferences = externalPreferences;
    // Load the list of JNDI Sources
    try {
        final String[] childNodeNames = userPreferences.childrenNames();
        for (int i = 0; i < childNodeNames.length; i++) {
            final String name = childNodeNames[i];
            final Preferences p = userPreferences.node(name);
            final String type = p.get("type", null);
            if (type == null) {
                p.removeNode();
            } else if (type.equals("local")) {
                final Properties props = new Properties();
                if (p.nodeExists("properties")) {
                    final Preferences preferences = p.node("properties");
                    final String[] strings = preferences.keys();
                    for (int j = 0; j < strings.length; j++) {
                        final String string = strings[j];
                        final String value = preferences.get(string, null);
                        if (value != null) {
                            props.setProperty(string, value);
                        } else {
                            props.remove(string);
                        }
                    }
                }

                final DriverConnectionDefinition driverConnection = new DriverConnectionDefinition(name,
                        p.get(DRIVER_KEY, null), p.get(URL_KEY, null), p.get(USERNAME_KEY, null),
                        p.get(PASSWORD_KEY, null), p.get(HOSTNAME_KEY, null), p.get(DATABASE_NAME_KEY, null),
                        p.get(DATABASE_TYPE_KEY, null), p.get(PORT_KEY, null), props);

                connectionDefinitions.put(name, driverConnection);
            } else if (type.equals("jndi")) {
                final JndiConnectionDefinition connectionDefinition = new JndiConnectionDefinition(name,
                        p.get(JNDI_LOCATION, null), p.get(DATABASE_TYPE_KEY, null), p.get(USERNAME_KEY, null),
                        p.get(PASSWORD_KEY, null));
                connectionDefinitions.put(name, connectionDefinition);
            } else {
                p.removeNode();
            }
        }
    } catch (BackingStoreException e) {
        // The system preferences system is not working - log this as a message and use defaults
        log.warn("Could not access the user prefererences while loading the "
                + "JNDI connection information - using default JNDI connection entries", e);
    } catch (final Exception e) {
        log.warn("Configuration information was invalid.", e);
    }

    // If the connectionDefinitions is empty, add any default entries
    if (connectionDefinitions.isEmpty() && DATASOURCE_PREFERENCES_NODE.equals(node)) {
        if (userPreferences.getBoolean("sample-data-created", false) == true) {
            // only create the sample connections once, if we work on a totally fresh config.
            return;
        }
        updateSourceList(SAMPLE_DATA_JNDI_SOURCE);
        updateSourceList(SAMPLE_DATA_DRIVER_SOURCE);
        updateSourceList(SAMPLE_DATA_MEMORY_SOURCE);
        updateSourceList(LOCAL_SAMPLE_DATA_DRIVER_SOURCE);
        updateSourceList(MYSQL_SAMPLE_DATA_DRIVER_SOURCE);
        userPreferences.putBoolean("sample-data-created", true);
        try {
            userPreferences.flush();
        } catch (BackingStoreException e) {
            // ignored ..
        }
    }
}

---

From source file:org.settings4j.connector.PreferencesConnector.java

/**
 * Resolve the given path and key against the given Preferences.
 *
 * @param path the preferences path (placeholder part before '/')
 * @param key the preferences key (placeholder part after '/')
 * @param preferences the Preferences to resolve against
 * @return the value for the placeholder, or <code>null</code> if none found
 */// w  w  w .j a v  a2s.  c  om
protected String getPreferenceValue(final String path, final String key, final Preferences preferences) {
    if (path != null) {
        // Do not create the node if it does not exist...
        try {
            if (preferences.nodeExists(path)) {
                return preferences.node(path).get(key, null);
            }
            return null;
        } catch (final BackingStoreException e) {
            throw new RuntimeException("Cannot access specified node path [" + path + "]", e);
        }
    }
    return preferences.get(key, null);
}

---

From source file:org.settings4j.helper.spring.Settings4jPlaceholderConfigurerTest.java

private void removeUnitTestNode(final Preferences userRoot) throws BackingStoreException {
    if (userRoot.nodeExists(PREF_UNITTEST_NODE)) {
        userRoot.node(PREF_UNITTEST_NODE).removeNode();
    }/*from  w w w. ja va2  s.c o  m*/
}

---

• «
• 1
• 2
• »