org.jboss.tools.seam.ui.search.SeamTableContentProvider.java Source code

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Here is the source code for org.jboss.tools.seam.ui.search.SeamTableContentProvider.java

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/*******************************************************************************
 * Copyright (c) 2007 Red Hat, Inc.
 * Distributed under license by Red Hat, Inc. All rights reserved.
 * This program is 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:
 *     Red Hat, Inc. - initial API and implementation
 ******************************************************************************/

package org.jboss.tools.seam.ui.search;

import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.search.internal.ui.text.IFileSearchContentProvider;
import org.eclipse.search.ui.text.AbstractTextSearchResult;

/**
 * Seam table content provider used in seam search page
 *  
 * @author Jeremy
 *
 */
public class SeamTableContentProvider implements IStructuredContentProvider, IFileSearchContentProvider {

    private final Object[] EMPTY_ARR = new Object[0];

    private SeamSearchResultPage fPage;
    private AbstractTextSearchResult fResult;

    /**
     * Constructs SeamTableContentProvider object
     * 
     * @param page
     */
    public SeamTableContentProvider(SeamSearchResultPage page) {
        fPage = page;
    }

    /**
     * (non-Javadoc)
     * @see org.eclipse.jface.viewers.IContentProvider#dispose()
     */
    public void dispose() {
        // nothing to do
    }

    /**
     * (non-Javadoc)
     * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
     */
    public Object[] getElements(Object inputElement) {
        if (inputElement instanceof SeamSearchResult) {
            int elementLimit = getElementLimit();
            Object[] elements = ((SeamSearchResult) inputElement).getElements();
            if (elementLimit != -1 && elements.length > elementLimit) {
                Object[] shownElements = new Object[elementLimit];
                System.arraycopy(elements, 0, shownElements, 0, elementLimit);
                return shownElements;
            }
            return elements;
        }
        return EMPTY_ARR;
    }

    /**
     * (non-Javadoc)
     * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
     */
    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
        if (newInput instanceof SeamSearchResult) {
            fResult = (SeamSearchResult) newInput;
        }
    }

    /**
     * (non-Javadoc)
     * @see org.eclipse.search.internal.ui.text.IFileSearchContentProvider#elementsChanged(java.lang.Object[])
     */
    public void elementsChanged(Object[] updatedElements) {
        TableViewer viewer = getViewer();
        int elementLimit = getElementLimit();
        boolean tableLimited = elementLimit != -1;
        for (int i = 0; i < updatedElements.length; i++) {
            if (fResult.getMatchCount(updatedElements[i]) > 0) {
                if (viewer.testFindItem(updatedElements[i]) != null)
                    viewer.update(updatedElements[i], null);
                else {
                    if (!tableLimited || viewer.getTable().getItemCount() < elementLimit)
                        viewer.add(updatedElements[i]);
                }
            } else
                viewer.remove(updatedElements[i]);
        }
    }

    private int getElementLimit() {
        return fPage.getElementLimit().intValue();
    }

    private TableViewer getViewer() {
        return (TableViewer) fPage.getViewer();
    }

    /**
     * (non-Javadoc)
     * @see org.eclipse.search.internal.ui.text.IFileSearchContentProvider#clear()
     */
    public void clear() {
        getViewer().refresh();
    }
}