| 1 | // License: GPL. For details, see LICENSE file.
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| 2 | package org.openstreetmap.josm.io;
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| 3 |
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| 4 | import static org.openstreetmap.josm.tools.I18n.tr;
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| 5 |
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| 6 | import java.io.BufferedInputStream;
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| 7 | import java.io.File;
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| 8 | import java.io.IOException;
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| 9 | import java.io.InputStream;
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| 10 | import java.util.List;
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| 11 | import java.util.zip.GZIPInputStream;
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| 12 |
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| 13 | import javax.swing.JOptionPane;
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| 14 |
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| 15 | import org.apache.tools.bzip2.CBZip2InputStream;
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| 16 | import org.openstreetmap.josm.Main;
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| 17 | import org.openstreetmap.josm.actions.ExtensionFileFilter;
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| 18 | import org.openstreetmap.josm.gui.HelpAwareOptionPane;
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| 19 | import org.openstreetmap.josm.gui.progress.ProgressMonitor;
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| 20 |
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| 21 | public abstract class FileImporter implements Comparable<FileImporter> {
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| 22 |
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| 23 | public final ExtensionFileFilter filter;
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| 24 |
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| 25 | public FileImporter(ExtensionFileFilter filter) {
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| 26 | this.filter = filter;
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| 27 | }
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| 28 |
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| 29 | public boolean acceptFile(File pathname) {
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| 30 | return filter.acceptName(pathname.getName());
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| 31 | }
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| 32 |
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| 33 | /**
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| 34 | * A batch importer is a file importer that prefers to read multiple files at the same time.
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| 35 | */
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| 36 | public boolean isBatchImporter() {
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| 37 | return false;
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| 38 | }
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| 39 |
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| 40 | /**
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| 41 | * Needs to be implemented if isBatchImporter() returns false.
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| 42 | */
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| 43 | public void importData(File file, ProgressMonitor progressMonitor) throws IOException, IllegalDataException {
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| 44 | throw new IOException(tr("Could not import ''{0}''.", file.getName()));
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| 45 | }
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| 46 |
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| 47 | /**
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| 48 | * Needs to be implemented if isBatchImporter() returns true.
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| 49 | */
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| 50 | public void importData(List<File> files, ProgressMonitor progressMonitor) throws IOException, IllegalDataException {
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| 51 | throw new IOException(tr("Could not import files."));
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| 52 | }
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| 53 |
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| 54 | /**
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| 55 | * Wrapper to give meaningful output if things go wrong.
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| 56 | * @return true if data import was successful
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| 57 | */
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| 58 | public boolean importDataHandleExceptions(File f, ProgressMonitor progressMonitor) {
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| 59 | try {
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| 60 | System.out.println("Open file: " + f.getAbsolutePath() + " (" + f.length() + " bytes)");
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| 61 | importData(f, progressMonitor);
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| 62 | return true;
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| 63 | } catch (Exception e) {
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| 64 | e.printStackTrace();
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| 65 | HelpAwareOptionPane.showMessageDialogInEDT(
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| 66 | Main.parent,
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| 67 | tr("<html>Could not read file ''{0}''.<br>Error is:<br>{1}</html>", f.getName(), e.getMessage()),
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| 68 | tr("Error"),
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| 69 | JOptionPane.ERROR_MESSAGE, null
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| 70 | );
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| 71 | return false;
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| 72 | }
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| 73 | }
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| 74 | public boolean importDataHandleExceptions(List<File> files, ProgressMonitor progressMonitor) {
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| 75 | try {
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| 76 | System.out.println("Open "+files.size()+" files");
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| 77 | importData(files, progressMonitor);
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| 78 | return true;
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| 79 | } catch (Exception e) {
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| 80 | e.printStackTrace();
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| 81 | HelpAwareOptionPane.showMessageDialogInEDT(
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| 82 | Main.parent,
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| 83 | tr("<html>Could not read files.<br>Error is:<br>{0}</html>", e.getMessage()),
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| 84 | tr("Error"),
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| 85 | JOptionPane.ERROR_MESSAGE, null
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| 86 | );
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| 87 | return false;
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| 88 | }
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| 89 | }
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| 90 |
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| 91 | /**
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| 92 | * If multiple files (with multiple file formats) are selected,
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| 93 | * they are opened in the order of their priorities.
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| 94 | * Highest priority comes first.
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| 95 | */
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| 96 | public double getPriority() {
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| 97 | return 0;
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| 98 | }
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| 99 |
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| 100 | public int compareTo(FileImporter other) {
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| 101 | return (new Double(this.getPriority())).compareTo(other.getPriority());
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| 102 | }
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| 103 |
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| 104 | public static CBZip2InputStream getBZip2InputStream(InputStream in) throws IOException {
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| 105 | if (in == null) {
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| 106 | return null;
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| 107 | }
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| 108 | BufferedInputStream bis = new BufferedInputStream(in);
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| 109 | int b = bis.read();
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| 110 | if (b != 'B')
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| 111 | throw new IOException(tr("Invalid bz2 file."));
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| 112 | b = bis.read();
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| 113 | if (b != 'Z')
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| 114 | throw new IOException(tr("Invalid bz2 file."));
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| 115 | return new CBZip2InputStream(bis);
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| 116 | }
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| 117 |
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| 118 | public static GZIPInputStream getGZipInputStream(InputStream in) throws IOException {
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| 119 | if (in == null) {
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| 120 | return null;
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| 121 | }
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| 122 | return new GZIPInputStream(in);
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| 123 | }
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| 124 | }
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