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/*******************************************************************************
* Copyright (c) 2006, 2012, 2012 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.ui.internal.utils;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;
/**
* The viewer filter to select those elements which matches the given filter pattern.
* <p>
* Copied from org.eclipse.ui.internal.navigator.filters.CommonFiltersTab$TablePatternFilter
*/
public class TablePatternFilter extends ViewerFilter {
private static final String ALL = "*"; //$NON-NLS-1$
protected StringMatcher matcher = null;
protected ILabelProvider labelProvider;
protected List<PropertyChangeListener> listeners;
public TablePatternFilter(ILabelProvider labelProvider) {
this.labelProvider = labelProvider;
listeners = Collections.synchronizedList(new ArrayList<PropertyChangeListener>());
}
/**
* Add a property change listener to this pattern filter.
*
* @param l The listener.
*/
public void addPropertyChangeListener(PropertyChangeListener l) {
listeners.add(l);
}
/**
* Remove a property change listener to this pattern filter.
*
* @param l The listener.
*/
public void removePropertyChangeListener(PropertyChangeListener l) {
listeners.remove(l);
}
/*
* (non-Javadoc)
* @see org.eclipse.jface.viewers.ViewerFilter#select(org.eclipse.jface.viewers.Viewer,
* java.lang.Object, java.lang.Object)
*/
@Override
public boolean select(Viewer viewer, Object parentElement, Object element) {
return match(labelProvider.getText(element));
}
/**
* Set a new pattern to filter elements.
*
* @param newPattern The new pattern
*/
public void setPattern(String newPattern) {
StringMatcher old = matcher;
if (newPattern == null || newPattern.trim().length() == 0) {
matcher = null;
}
else {
String patternString = ALL + newPattern + ALL;
matcher = new StringMatcher(patternString, true, false);
}
firePatternChangedEvent(old, matcher);
}
/**
* Fire a pattern changed event to all listening listeners.
*
* @param oldMatcher The old matcher.
* @param newMatcher The new matcher.
*/
protected void firePatternChangedEvent(StringMatcher oldMatcher, StringMatcher newMatcher) {
PropertyChangeEvent event = new PropertyChangeEvent(this, "pattern", oldMatcher, newMatcher); //$NON-NLS-1$
synchronized(listeners) {
for(PropertyChangeListener listener : listeners) {
listener.propertyChange(event);
}
}
}
/**
* Answers whether the given String matches the pattern.
*
* @param input the String to test
*
* @return whether the string matches the pattern
*/
public boolean match(String input) {
if (input == null) {
return false;
}
return matcher == null || matcher.match(input);
}
}
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