Preferences.java

package es.axios.udig.spatialoperations.internal.preferences;

import javax.measure.unit.SI;
import javax.measure.unit.Unit;

import org.eclipse.jface.preference.IPreferenceStore;

import es.axios.udig.spatialoperations.Activator;

/**
 * Single access point for spatial operation preferences.
 * 
 * @author Gabriel Roldan (www.axios.es)
 * @author Mauricio Pazos (www.axios.es)
 * @since 1.1.0
 */
public class Preferences {

    /**
     * @return the default width preference for a buffer operation
     */
    public static double bufferWidth() {
        return getDouble(PreferenceConstants.BUFFER_WIDTH);
    }

    /**
     * @return the default width preference for a buffer operation
     */
    public static Unit bufferUnits() {
        String unitId = getString(PreferenceConstants.BUFFER_UNITS);
        Unit unit = SI.METER;
        if (unitId != null && unitId.trim().length() > 0) {
            try {
                unit = Unit.valueOf(unitId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return unit;
    }

    /**
     * @return wether to use the map, layer or user defined units or the user defined units for a
     *         buffer operation by default
     * @see PreferenceConstants#BUFFER_UNITS_LAYER
     * @see PreferenceConstants#BUFFER_UNITS_MAP
     * @see PreferenceConstants#BUFFER_UNITS_USER
     */
    public static String bufferUseUnitsFrom() {
        return getString(PreferenceConstants.BUFFER_USE_UNITS_FROM);
    }

    /**
     * @return the preference for the number of quadrant segments used to approximate curves in a
     *         buffer operation by default
     */
    public static int bufferQuadrantSegments() {
        return getInt(PreferenceConstants.BUFFER_QUADRANT_SEGMENTS);
    }

    public static boolean bufferMergeGeometries() {
        return getBoolean(PreferenceConstants.BUFFER_MERGE_GEOMETRIES);
    }

    /**
     * @return wether to use the whole layer if no selection is set
     */
    public static boolean selectionFallbackToWholeLayer() {
        return getBoolean(PreferenceConstants.SELECTION_FALLBACK_TO_WHOLE_LAYER);
    }

    private static int getInt( final String preferenceName ) {
        IPreferenceStore store = Preferences.getPreferenceStore();
        int value = store.getInt(preferenceName);
        return value;
    }

    private static boolean getBoolean( final String preferenceName ) {
        IPreferenceStore store = Preferences.getPreferenceStore();
        boolean value = store.getBoolean(preferenceName);
        return value;
    }

    private static String getString( final String preferenceName ) {
        IPreferenceStore store = Preferences.getPreferenceStore();
        String value = store.getString(preferenceName);
        return value;
    }

    private static double getDouble( final String preferenceName ) {
        IPreferenceStore store = Preferences.getPreferenceStore();
        double value = store.getDouble(preferenceName);
        return value;
    }

    /**
     * Provides access to the plugin's preference store
     * 
     * @return this plugin's preference store
     */
    public static IPreferenceStore getPreferenceStore() {
        Activator activator = Activator.getDefault();
        IPreferenceStore store = activator.getPreferenceStore();
        return store;
    }

}