eu.essilab.lablib.checkboxtree.NullTreeCheckingModel Maven / Gradle / Ivy

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CheckboxTree is a Java Swing component providing a tree-like widget with checkboxes in each node. Checkboxes can toggle between the checked and unchecked state. Disabled and greyed checkboxes are also supported. The CheckboxTree API design is inspired by the JTree interface.
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/*
 * Copyright 2007-2022 Enrico Boldrini, Lorenzo Bigagli This file is part of
 * CheckboxTree. CheckboxTree is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version. CheckboxTree is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details. You should have received a copy of the GNU
 * General Public License along with CheckboxTree; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */
package eu.essilab.lablib.checkboxtree;

import javax.swing.tree.TreePath;

/**
 * Convenience class representing an empty tree checking model (cf. the Null
 * Object pattern), whose paths are always enabled, unchecked and ungreyed. This
 * class is a singleton.
 * 
 * @author Lorenzo Bigagli
 */
public class NullTreeCheckingModel implements TreeCheckingModel {

    private final static NullTreeCheckingModel singleton;

    static {
	singleton = new NullTreeCheckingModel();
    }

    private NullTreeCheckingModel() {
    }

    public static NullTreeCheckingModel getInstance() {
	return singleton;
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#addCheckingPath
     * (javax.swing.tree.TreePath)
     */
    public void addCheckingPath(TreePath path) {
	// nothing to do (cf. the Null Object pattern)
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#addCheckingPaths
     * (javax.swing.tree.TreePath[])
     */
    public void addCheckingPaths(TreePath[] paths) {
	// nothing to do (cf. the Null Object pattern)
    }

    /*
     * (non-Javadoc)
     * 
     * @seeit.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#
     * addTreeCheckingListener
     * (eu.essilab.lablib.checkboxtree.TreeCheckingListener)
     */
    public void addTreeCheckingListener(TreeCheckingListener tcl) {
	// nothing to do (cf. the Null Object pattern)
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#clearChecking
     * ()
     */
    public void clearChecking() {
	// nothing to do (cf. the Null Object pattern)
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#getCheckingMode
     * ()
     */
    public CheckingMode getCheckingMode() {
	return null;
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#getCheckingPaths
     * ()
     */
    public TreePath[] getCheckingPaths() {
	return null;
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#getCheckingRoots
     * ()
     */
    public TreePath[] getCheckingRoots() {
	return null;
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#getGreyingPaths
     * ()
     */
    public TreePath[] getGreyingPaths() {
	return null;
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#isPathChecked
     * (javax.swing.tree.TreePath)
     */
    public boolean isPathChecked(TreePath path) {
	return false;
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#isPathEnabled
     * (javax.swing.tree.TreePath)
     */
    public boolean isPathEnabled(TreePath path) {
	return true;
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#isPathGreyed
     * (javax.swing.tree.TreePath)
     */
    public boolean isPathGreyed(TreePath path) {
	return false;
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#removeCheckingPath
     * (javax.swing.tree.TreePath)
     */
    public void removeCheckingPath(TreePath path) {
	// nothing to do (cf. the Null Object pattern)
    }

    /*
     * (non-Javadoc)
     * 
     * @seeit.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#
     * removeCheckingPaths(javax.swing.tree.TreePath[])
     */
    public void removeCheckingPaths(TreePath[] paths) {
	// nothing to do (cf. the Null Object pattern)
    }

    /*
     * (non-Javadoc)
     * 
     * @seeit.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#
     * removeTreeCheckingListener
     * (eu.essilab.lablib.checkboxtree.TreeCheckingListener)
     */
    public void removeTreeCheckingListener(TreeCheckingListener tcl) {
	// nothing to do (cf. the Null Object pattern)
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#setCheckingMode
     * (eu.essilab.lablib.checkboxtree.TreeCheckingModel.CheckingMode)
     */
    public void setCheckingMode(CheckingMode mode) {
	// nothing to do (cf. the Null Object pattern)
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#setCheckingPath
     * (javax.swing.tree.TreePath)
     */
    public void setCheckingPath(TreePath path) {
	// nothing to do (cf. the Null Object pattern)
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#setCheckingPaths
     * (javax.swing.tree.TreePath[])
     */
    public void setCheckingPaths(TreePath[] paths) {
	// nothing to do (cf. the Null Object pattern)
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#setPathEnabled
     * (javax.swing.tree.TreePath, boolean)
     */
    public void setPathEnabled(TreePath path, boolean enable) {
	// nothing to do (cf. the Null Object pattern)
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#setPathsEnabled
     * (javax.swing.tree.TreePath[], boolean)
     */
    public void setPathsEnabled(TreePath[] paths, boolean enable) {
	// nothing to do (cf. the Null Object pattern)
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * eu.essilab.lablib.checkboxtree.TreeCheckingModel#toggleCheckingPath
     * (javax.swing.tree.TreePath)
     */
    public void toggleCheckingPath(TreePath pathForRow) {
	// nothing to do (cf. the Null Object pattern)
    }

}