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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * 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 org.netbeans.swing.etable;

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;

/**
 * Transferable for use with the ETable. This class is partial copy (with
 * omission of the HTML transfers)
 * of javax.swing.plaf.basic.BasicTransferable which is unfortunately not
 * public.
 *
 * @author David Strupl
 */
public class ETableTransferable implements Transferable {

    /** The data content of this transferable */
    protected String plainData;
    
    private static DataFlavor[] stringFlavors;
    private static DataFlavor[] plainFlavors;
    
    static {
        try {
            plainFlavors = new DataFlavor[3];
            plainFlavors[0] = new DataFlavor("text/plain;class=java.lang.String");
            plainFlavors[1] = new DataFlavor("text/plain;class=java.io.Reader");
            plainFlavors[2] = new DataFlavor("text/plain;charset=unicode;class=java.io.InputStream");
            
            stringFlavors = new DataFlavor[2];
            stringFlavors[0] = new DataFlavor(DataFlavor.javaJVMLocalObjectMimeType+";class=java.lang.String");
            stringFlavors[1] = DataFlavor.stringFlavor;
            
        } catch (ClassNotFoundException cle) {
            System.err.println("error initializing SheetTasbleTransferable");
        }
    }

    /**
     * Create a new transferable.
     * @param plainData The data content of this transferable
     */
    public ETableTransferable(String plainData) {
        this.plainData = plainData;
    }
    
    
    /**
     * Returns an array of DataFlavor objects indicating the flavors the data
     * can be provided in.  The array should be ordered according to preference
     * for providing the data (from most richly descriptive to least descriptive).
     * @return an array of data flavors in which this data can be transferred
     */
    @Override
    public DataFlavor[] getTransferDataFlavors() {
        int nPlain = (isPlainSupported()) ? plainFlavors.length: 0;
        int nString = (isPlainSupported()) ? stringFlavors.length : 0;
        int nFlavors = nPlain + nString;
        DataFlavor[] flavors = new DataFlavor[nFlavors];
        
        // fill in the array
        int nDone = 0;
        if (nPlain > 0) {
            System.arraycopy(plainFlavors, 0, flavors, nDone, nPlain);
            nDone += nPlain;
        }
        if (nString > 0) {
            System.arraycopy(stringFlavors, 0, flavors, nDone, nString);
            nDone += nString;
        }
        return flavors;
    }
    
    /**
     * Returns whether or not the specified data flavor is supported for
     * this object.
     * @param flavor the requested flavor for the data
     * @return boolean indicating whether or not the data flavor is supported
     */
    @Override
    public boolean isDataFlavorSupported(DataFlavor flavor) {
        DataFlavor[] flavors = getTransferDataFlavors();
        for (int i = 0; i < flavors.length; i++) {
            if (flavors[i].equals(flavor)) {
                return true;
            }
        }
        return false;
    }
    
    /**
     * Returns an object which represents the data to be transferred.  The class
     * of the object returned is defined by the representation class of the flavor.
     *
     * @param flavor the requested flavor for the data
     * @see DataFlavor#getRepresentationClass
     * @exception IOException                if the data is no longer available
     *              in the requested flavor.
     * @exception UnsupportedFlavorException if the requested data flavor is
     *              not supported.
     */
    @Override
    public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
        if (isPlainFlavor(flavor)) {
            String data = getPlainData();
            data = (data == null) ? "" : data;
            if (String.class.equals(flavor.getRepresentationClass())) {
                return data;
            } else if (Reader.class.equals(flavor.getRepresentationClass())) {
                return new StringReader(data);
            } else if (InputStream.class.equals(flavor.getRepresentationClass())) {
                return new ByteArrayInputStream(data.getBytes());
            }
            // fall through to unsupported
            
        } else if (isStringFlavor(flavor)) {
            String data = getPlainData();
            data = (data == null) ? "" : data;
            return data;
        }
        throw new UnsupportedFlavorException(flavor);
    }
    
    // --- plain text flavors ----------------------------------------------------
    
    /**
     * Returns whether or not the specified data flavor is an plain flavor that
     * is supported.
     * @param flavor the requested flavor for the data
     * @return boolean indicating whether or not the data flavor is supported
     */
    protected boolean isPlainFlavor(DataFlavor flavor) {
        DataFlavor[] flavors = plainFlavors;
        for (int i = 0; i < flavors.length; i++) {
            if (flavors[i].equals(flavor)) {
                return true;
            }
        }
        return false;
    }
    
    /**
     * Should the plain text flavors be offered?  If so, the method
     * getPlainData should be implemented to provide something reasonable.
     */
    protected boolean isPlainSupported() {
        return plainData != null;
    }
    
    /**
     * Fetch the data in a text/plain format.
     */
    protected String getPlainData() {
        return plainData;
    }
    
    // --- string flavorss --------------------------------------------------------
    
    /**
     * Returns whether or not the specified data flavor is a String flavor that
     * is supported.
     * @param flavor the requested flavor for the data
     * @return boolean indicating whether or not the data flavor is supported
     */
    protected boolean isStringFlavor(DataFlavor flavor) {
        DataFlavor[] flavors = stringFlavors;
        for (int i = 0; i < flavors.length; i++) {
            if (flavors[i].equals(flavor)) {
                return true;
            }
        }
        return false;
    }
}