com.jaspersoft.studio.dnd.DataAdapterDragSourceListener.java Source code

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Here is the source code for com.jaspersoft.studio.dnd.DataAdapterDragSourceListener.java

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/*******************************************************************************
 * Copyright (C) 2005 - 2014 TIBCO Software Inc. All rights reserved. http://www.jaspersoft.com.
 * 
 * Unless you have purchased a commercial license agreement from Jaspersoft, the following license terms apply:
 * 
 * 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
 ******************************************************************************/
package com.jaspersoft.studio.dnd;

import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.StringUtils;
import org.eclipse.jface.util.TransferDragSourceListener;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.dnd.DragSource;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.FileTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;

import com.jaspersoft.studio.JaspersoftStudioPlugin;
import com.jaspersoft.studio.data.DataAdapterManager;
import com.jaspersoft.studio.data.MDataAdapter;
import com.jaspersoft.studio.messages.Messages;
import com.jaspersoft.studio.utils.jasper.JasperReportsConfiguration;

/**
 * Implementation of a {@link TransferDragSourceListener} that is supposed to handle the drag operation of an
 * {@link MDataAdapter} node from the Repository View.
 * 
 * @author Massimo Rabbi (mrabbi@users.sourceforge.net)
 * 
 */
public class DataAdapterDragSourceListener implements TransferDragSourceListener {

    private static final String ENCODING = net.sf.jasperreports.eclipse.util.FileUtils.UTF8_ENCODING; //$NON-NLS-1$
    private static final String DATA_ADAPTER_FILE_PREFIX = "dataAdapter"; //$NON-NLS-1$
    private static final String DATA_ADAPTER_FILE_EXT = ".xml"; //$NON-NLS-1$
    private String[] dataAdapterFilesLocations = new String[0];

    @Override
    public void dragStart(DragSourceEvent event) {
        event.doit = !getDragSelection(event).isEmpty();
    }

    @Override
    public void dragSetData(DragSourceEvent event) {
        if (getTransfer().isSupportedType(event.dataType)) {
            List<MDataAdapter> dataAdaptersSelected = getDragSelection(event);
            List<String> locations = new ArrayList<String>(dataAdaptersSelected.size());
            for (MDataAdapter da : dataAdaptersSelected) {
                locations.add(createTemDataAdapterFile(da));
            }
            dataAdapterFilesLocations = locations.toArray(new String[locations.size()]);
            event.data = dataAdapterFilesLocations;
        } else {
            dataAdapterFilesLocations = new String[0];
            event.data = null;
        }
    }

    @Override
    public void dragFinished(DragSourceEvent event) {
        for (String daFileLocation : dataAdapterFilesLocations) {
            FileUtils.deleteQuietly(new File(daFileLocation));
        }
    }

    @Override
    public Transfer getTransfer() {
        return FileTransfer.getInstance();
    }

    /*
     * Gets the list of data adapters selected.
     */
    private List<MDataAdapter> getDragSelection(DragSourceEvent event) {
        if (event.getSource() instanceof DragSource) {
            List<MDataAdapter> dataAdapters = new ArrayList<MDataAdapter>();
            Control control = ((DragSource) event.getSource()).getControl();
            if (control instanceof Tree && ((Tree) control).getSelection().length > 0) {
                for (TreeItem tItem : ((Tree) control).getSelection()) {
                    Object data = tItem.getData();
                    if (data instanceof MDataAdapter) {
                        dataAdapters.add((MDataAdapter) data);
                    }
                }
                return dataAdapters;
            }
        }
        return new ArrayList<MDataAdapter>(0);
    }

    /*
     * Creates a temporary file for the specified data adapter.
     */
    private String createTemDataAdapterFile(final MDataAdapter dataAdapter) {
        try {
            File tempDirectory = FileUtils.getTempDirectory();
            String tempDataAdapterFilePath = tempDirectory.getAbsolutePath() + "/" //$NON-NLS-1$
                    + StringUtils.deleteWhitespace(dataAdapter.getDisplayText()) + DATA_ADAPTER_FILE_EXT;
            File tempDataAdapterFile = new File(tempDataAdapterFilePath);
            if (tempDataAdapterFile.exists()) {
                // fallback solution
                tempDataAdapterFile = File.createTempFile(DATA_ADAPTER_FILE_PREFIX, DATA_ADAPTER_FILE_EXT);
            }
            JasperReportsConfiguration jrConfig = dataAdapter.getJasperConfiguration();
            if (jrConfig == null)
                jrConfig = JasperReportsConfiguration.getDefaultInstance();
            String xml = DataAdapterManager.toDataAdapterFile(dataAdapter.getValue(), jrConfig);
            FileUtils.writeByteArrayToFile(tempDataAdapterFile, xml.getBytes(ENCODING));
            return tempDataAdapterFile.getAbsolutePath();
        } catch (UnsupportedEncodingException e) {
            JaspersoftStudioPlugin.getInstance()
                    .logError(NLS.bind(Messages.DataAdapterDragSourceListener_EncondingErrorMsg, ENCODING), e);
        } catch (IOException e) {
            JaspersoftStudioPlugin.getInstance().logError(Messages.DataAdapterDragSourceListener_IOErrorMsg, e);
        }
        return null;
    }

}