com.google.dart.tools.internal.search.ui.text.FileTableContentProvider.java Source code

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Here is the source code for com.google.dart.tools.internal.search.ui.text.FileTableContentProvider.java

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/*
 * Copyright (c) 2012, the Dart project authors.
 * 
 * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
 * 
 * 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 com.google.dart.tools.internal.search.ui.text;

import com.google.dart.tools.search.internal.ui.text.FileSearchResult;
import com.google.dart.tools.search.internal.ui.text.IFileSearchContentProvider;
import com.google.dart.tools.search.ui.text.AbstractTextSearchResult;

import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;

public class FileTableContentProvider implements IStructuredContentProvider, IFileSearchContentProvider {

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

    private FileSearchPage fPage;
    private AbstractTextSearchResult fResult;

    public FileTableContentProvider(FileSearchPage page) {
        fPage = page;
    }

    @Override
    public void clear() {
        getViewer().refresh();
    }

    @Override
    public void dispose() {
        // nothing to do
    }

    @Override
    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]);
            }
        }
    }

    @Override
    public Object[] getElements(Object inputElement) {
        if (inputElement instanceof FileSearchResult) {
            int elementLimit = getElementLimit();
            Object[] elements = ((FileSearchResult) 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;
    }

    @Override
    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
        if (newInput instanceof FileSearchResult) {
            fResult = (FileSearchResult) newInput;
        }
    }

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

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