com.aptana.index.core.ui.handlers.BaseHandler.java Source code

Introduction

Here is the source code for com.aptana.index.core.ui.handlers.BaseHandler.java

Source

/**
 * Aptana Studio
 * Copyright (c) 2005-2011 by Appcelerator, Inc. All Rights Reserved.
 * Licensed under the terms of the GNU Public License (GPL) v3 (with exceptions).
 * Please see the license.html included with this distribution for details.
 * Any modifications to this file must keep this entire header intact.
 */
package com.aptana.index.core.ui.handlers;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.expressions.IEvaluationContext;
import org.eclipse.core.filesystem.IFileStore;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.ISources;

import com.aptana.core.io.efs.EFSUtils;

abstract class BaseHandler extends AbstractHandler {
    private List<IFileStore> _fileStores;

    /**
     * BaseHandler
     */
    public BaseHandler() {
        this._fileStores = new ArrayList<IFileStore>();
    }

    /**
     * addFileStore
     * 
     * @param fileStore
     */
    private void addFileStore(IFileStore fileStore) {
        this._fileStores.add(fileStore);
    }

    /**
     * clearFileStores
     */
    private void clearFileStores() {
        this._fileStores.clear();
    }

    /**
     * getFileStores
     * 
     * @return
     */
    protected List<IFileStore> getFileStores() {
        return this._fileStores;
    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.core.commands.AbstractHandler#isEnabled()
     */
    @Override
    public boolean isEnabled() {
        return this._fileStores.isEmpty() == false;
    }

    /**
     * isValid
     * 
     * @return
     */
    protected abstract boolean isValid(IFileStore fileStore);

    /*
     * (non-Javadoc)
     * @see org.eclipse.core.commands.AbstractHandler#setEnabled(java.lang.Object)
     */
    @Override
    public void setEnabled(Object evaluationContext) {
        // clear cached selection
        this.clearFileStores();

        if (evaluationContext instanceof IEvaluationContext) {
            IEvaluationContext context = (IEvaluationContext) evaluationContext;
            Object value = context.getVariable(ISources.ACTIVE_CURRENT_SELECTION_NAME);

            if (value instanceof ISelection) {
                ISelection selection = (ISelection) value;

                if (selection instanceof IStructuredSelection && selection.isEmpty() == false) {
                    IStructuredSelection structuredSelection = (IStructuredSelection) selection;

                    for (Object object : structuredSelection.toArray()) {
                        if (object instanceof IProject || object instanceof IFolder || object instanceof IFile) {
                            IResource resource = (IResource) object;
                            IFileStore fileStore = EFSUtils.getFileStore(resource);

                            if (this.isValid(fileStore)) {
                                this.addFileStore(fileStore);
                            }
                        }
                    }
                }
            }
        }
    }
}