tapestry/tapestry-contrib/src/java/org/apache/tapestry/contrib/tree/simple/SimpleTreeStateModel.java

// Copyright 2004, 2005 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package org.apache.tapestry.contrib.tree.simple;

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;

import org.apache.tapestry.contrib.tree.model.ITreeStateModel;

/**
 * @author ceco
 */
public class SimpleTreeStateModel implements ITreeStateModel, Serializable
{

    private static final long serialVersionUID = 9206852255511734400L;

    private Set m_setExpanded;
    private Object m_objSelectedNodeUID = null;

    /**
     * Constructor for SimpleTreeStateModel.
     */
    public SimpleTreeStateModel()
    {
        super();
        initialize();
    }

    private void initialize()
    {
        m_setExpanded = new HashSet();
        m_objSelectedNodeUID = null;
    }

    /**
     * @see org.apache.tapestry.contrib.tree.model.ITreeStateModel#getExpandSelection()
     */
    public Set getExpandSelection()
    {
        return m_setExpanded;
    }

    /**
     * @see org.apache.tapestry.contrib.tree.model.ITreeStateModel#expand(Object)
     */
    public void expand(Object objUniqueKey)
    {
        m_setExpanded.add(objUniqueKey);
        // setSelectedNode(objUniqueKey);
    }

    /**
     * @see org.apache.tapestry.contrib.tree.model.ITreeStateModel#expandPath(Object)
     */
    public void expandPath(Object objUniqueKey)
    {
        m_setExpanded.add(objUniqueKey);
        // setSelectedNode(objUniqueKey);
    }

    /**
     * @see org.apache.tapestry.contrib.tree.model.ITreeStateModel#collapse(Object)
     */
    public void collapse(Object objUniqueKey)
    {
        m_setExpanded.remove(objUniqueKey);
        // setSelectedNode(objUniqueKey);
    }

    /**
     * @see org.apache.tapestry.contrib.tree.model.ITreeStateModel#collapsePath(Object)
     */
    public void collapsePath(Object objUniqueKey)
    {
        m_setExpanded.remove(objUniqueKey);
        // setSelectedNode(objUniqueKey);
    }

    /**
     * @see org.apache.tapestry.contrib.tree.model.ITreeStateModel#isUniqueKeyExpanded(Object)
     */
    public boolean isUniqueKeyExpanded(Object objUniqueKey)
    {
        return m_setExpanded.contains(objUniqueKey);
    }

    /**
     * @see org.apache.tapestry.contrib.tree.model.ITreeStateModel#getSelectedNode()
     */
    public Object getSelectedNode()
    {
        return m_objSelectedNodeUID;
    }

    public void setSelectedNode(Object objUniqueKey)
    {
        if (m_objSelectedNodeUID == null
                || !m_objSelectedNodeUID.equals(objUniqueKey))
            m_objSelectedNodeUID = objUniqueKey;
    }

    /**
     * @see org.apache.tapestry.contrib.tree.model.ITreeStateModel#resetState()
     */
    public void resetState()
    {
        initialize();
    }

}