org.opencms.gwt.client.ui.input.CmsDefaultStringModel Maven / Gradle / Ivy
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/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* For further information about Alkacon Software, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.gwt.client.ui.input;
import com.google.common.base.Objects;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.event.shared.SimpleEventBus;
/**
* The default string model implementation.
*
* @since 8.0.0
*/
public class CmsDefaultStringModel implements I_CmsStringModel {
/** The event bus for this class. */
EventBus m_eventBus = new SimpleEventBus();
/**
* A flag which indicates that the model is currently being updated, which is used to prevent infinite recursion.
*/
private boolean m_active;
/** The id. */
private String m_id;
/** The model value. */
private String m_value;
/**
* Creates a new string model.
*
* @param id the model id
*/
public CmsDefaultStringModel(String id) {
m_id = id;
m_value = "";
}
/**
* @see com.google.gwt.event.logical.shared.HasValueChangeHandlers#addValueChangeHandler(com.google.gwt.event.logical.shared.ValueChangeHandler)
*/
public HandlerRegistration addValueChangeHandler(ValueChangeHandler handler) {
return m_eventBus.addHandler(ValueChangeEvent.getType(), handler);
}
/**
* @see com.google.gwt.event.shared.HasHandlers#fireEvent(com.google.gwt.event.shared.GwtEvent)
*/
public void fireEvent(GwtEvent> event) {
m_eventBus.fireEvent(event);
}
/**
* @see org.opencms.gwt.client.ui.input.I_CmsStringModel#getId()
*/
public String getId() {
return m_id;
}
/**
* @see org.opencms.gwt.client.ui.input.I_CmsStringModel#getValue()
*/
public String getValue() {
return m_value;
}
/**
* @see org.opencms.gwt.client.ui.input.I_CmsStringModel#setValue(java.lang.String, boolean)
*/
public void setValue(String value, boolean notify) {
if (!m_active) {
m_active = true;
try {
boolean changed = !Objects.equal(value, m_value);
m_value = value;
if (notify && changed) {
ValueChangeEvent.fire(this, value);
}
} finally {
m_active = false;
}
}
}
}