107 lines
3.2 KiB
Java
Executable File
107 lines
3.2 KiB
Java
Executable File
/*
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* Copyright (C) 2001-2004 Red Hat Inc. All Rights Reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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package com.arsdigita.bebop;
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import com.arsdigita.bebop.parameters.ParameterModel;
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import com.arsdigita.util.Assert;
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/**
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* An implementation of {@link SingleSelectionModel} that uses
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* a state parameter for managing the currently selected key.
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* <p>
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*
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* A typical use case for this class is as follows.
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* <blockquote><pre><code>public TheConstructor() {
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* m_parameter = new StringParameter("my_key");
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* m_sel = new ParameterSingleSelectionModel(m_parameter);
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* }
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*
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* public void register(Page p) {
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* p.addComponent(this);
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* p.addComponentStateParam(this, m_param);
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* }</code></pre></blockquote>
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*
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* @author Stanislav Freidin
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* @version $Id: ParameterSingleSelectionModel.java 287 2005-02-22 00:29:02Z sskracic $
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*/
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public class ParameterSingleSelectionModel
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extends AbstractSingleSelectionModel {
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private ParameterModel m_parameter;
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/**
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* Constructs a new ParameterSingleSelectionModel.
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*
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* @param m the parameter model that will be used to
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* keep track of the currently selected key
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*/
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public ParameterSingleSelectionModel(ParameterModel m) {
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super();
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m_parameter = m;
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}
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/**
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* Returns the key that identifies the selected element.
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*
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* @param state a <code>PageState</code> value
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* @return a <code>String</code> value.
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*/
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public Object getSelectedKey(PageState state) {
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final FormModel model = state.getPage().getStateModel();
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if (model.containsFormParam(m_parameter)) {
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return state.getValue(m_parameter);
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} else {
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return null;
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}
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}
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public final ParameterModel getStateParameter() {
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return m_parameter;
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}
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/**
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* Set the selected key.
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*
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* @param state represents the state of the current request
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* @param newKey the new selected key
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*/
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public void setSelectedKey(PageState state, Object newKey) {
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final Object oldKey = getSelectedKey(state);
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if (Assert.isEnabled()) {
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final FormModel model = state.getPage().getStateModel();
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Assert.isTrue(model.containsFormParam(m_parameter));
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}
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state.setValue(m_parameter, newKey);
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if (newKey == null && oldKey == null) {
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return;
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}
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if (newKey != null && newKey.equals(oldKey)) {
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return;
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}
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fireStateChanged(state);
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}
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}
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