org.eclipse.jdt.internal.debug.ui.actions.ShowNullArrayEntriesAction.java Source code

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Here is the source code for org.eclipse.jdt.internal.debug.ui.actions.ShowNullArrayEntriesAction.java

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/*******************************************************************************
 * Copyright (c) 2000, 2013 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.jdt.internal.debug.ui.actions;

import org.eclipse.debug.core.DebugException;
import org.eclipse.jdt.debug.core.IJavaDebugTarget;
import org.eclipse.jdt.internal.debug.core.model.JDIArrayEntryVariable;
import org.eclipse.jdt.internal.debug.ui.IJDIPreferencesConstants;
import org.eclipse.jdt.internal.debug.ui.JDIDebugUIPlugin;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.viewers.Viewer;

/**
 * Shows non-final static variables
 */
public class ShowNullArrayEntriesAction extends ViewFilterAction {

    public ShowNullArrayEntriesAction() {
        super();
    }

    /**
     * @see ViewFilterAction#getPreferenceKey()
     */
    @Override
    protected String getPreferenceKey() {
        return IJDIPreferencesConstants.PREF_SHOW_NULL_ARRAY_ENTRIES;
    }

    /**
     * @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) {
        if (getValue()) {
            // when on, filter nothing
            return true;
        }
        if (element instanceof JDIArrayEntryVariable) {
            JDIArrayEntryVariable variable = (JDIArrayEntryVariable) element;
            try {
                return !variable.getValue().equals(((IJavaDebugTarget) variable.getDebugTarget()).nullValue());
            } catch (DebugException e) {
                JDIDebugUIPlugin.log(e);
            }
        }
        return true;
    }

    @Override
    protected boolean getPreferenceValue() {
        String key = getCompositeKey();
        IPreferenceStore store = getPreferenceStore();
        boolean value = false;
        if (store.contains(key)) {
            value = store.getBoolean(key);
        }
        return value;
    }
}