Changeset 3383
- Timestamp:
- May 25, 2007, 12:17:46 PM (16 years ago)
- File:
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- 1 edited
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trunk/doc/src/docbook/developerdoc/plugin_developer.xml
r3371 r3383 1717 1717 <title>File unpacker plug-ins</title> 1718 1718 <para> 1719 TODO 1719 The BASE web client has integrated support for unpacking of 1720 compressed files. See <xref linkend="file_system.handling.upload" />. 1721 Behind the scenes, this support is provided by plug-ins. The standard 1722 BASE distribution comes with support for ZIP files 1723 (<classname>net.sf.basedb.plugins.ZipFileUnpacker</classname>). 1720 1724 </para> 1725 <para> 1726 To add support for additional compressed formats you have to create a plug-in that 1727 implements the <interfacename>net.sf.basedb.util.zip.FileUnpacker</interfacename> 1728 interface. The best way to do this is to extend the 1729 <classname>net.sf.basedb.util.zip.AbstractFileUnpacker</classname> which 1730 implements all methods in the <interfacename>Plugin</interfacename> 1731 and <interfacename>InteractivePlugin</interfacename> 1732 interfaces except <methodname>Plugin.getAbout()</methodname>. This leaves 1733 you with the actual unpacking of the files as the only thing to implement. 1734 </para> 1735 1736 <note> 1737 <title>No support for configurations</title> 1738 The integrated upload in the web interface only works with plug-ins that 1739 doesn't require a configuration to run. 1740 </note> 1741 1742 <variablelist> 1743 <title>Methods in the <interfacename>FileUnpacker</interfacename> interface</title> 1744 <varlistentry> 1745 <term> 1746 <methodsynopsis language="java"> 1747 <modifier>public</modifier> 1748 <type>String</type> 1749 <methodname>getFormatName</methodname> 1750 </methodsynopsis> 1751 </term> 1752 <listitem> 1753 <para> 1754 Return a short string naming the file format. For example: 1755 <constant>ZIP files</constant> or <constant>TAR files</constant>. 1756 </para> 1757 </listitem> 1758 </varlistentry> 1759 1760 <varlistentry> 1761 <term> 1762 <methodsynopsis language="java"> 1763 <modifier>public</modifier> 1764 <type>Set<String></type> 1765 <methodname>getExtensions</methodname> 1766 </methodsynopsis> 1767 </term> 1768 <listitem> 1769 <para> 1770 Return a set of strings with the file extensions that 1771 are most commonly used with the compressed file format. 1772 For example: <constant>[zip, jar]</constant>. Do not include 1773 the dot in the extensions. The web client and the 1774 <methodname>AbstractFlatFileUnpacker.isInContext()</methodname> method 1775 will use this information to automatically guess which plug-in to 1776 use for unpacking the files. 1777 </para> 1778 </listitem> 1779 </varlistentry> 1780 1781 <varlistentry> 1782 <term> 1783 <methodsynopsis language="java"> 1784 <modifier>public</modifier> 1785 <type>Set<String></type> 1786 <methodname>getMimeTypes</methodname> 1787 </methodsynopsis> 1788 </term> 1789 <listitem> 1790 <para> 1791 Return a set of string with the MIME types that commonly used with 1792 the compressed file format. For example: 1793 <constant>[application/zip, application/java-archive]</constant>. 1794 This information is used by the 1795 <methodname>AbstractFlatFileUnpacker.isInContext()</methodname> 1796 method to automatically guess which plug-in to use for unpacking 1797 the files. 1798 </para> 1799 </listitem> 1800 </varlistentry> 1801 1802 <varlistentry> 1803 <term> 1804 <methodsynopsis language="java"> 1805 <modifier>public</modifier> 1806 <type>int</type> 1807 <methodname>unpack</methodname> 1808 <methodparam> 1809 <type>DbControl</type> 1810 <parameter>dc</parameter> 1811 </methodparam> 1812 <methodparam> 1813 <type>Directory</type> 1814 <parameter>dir</parameter> 1815 </methodparam> 1816 <methodparam> 1817 <type>InputStream</type> 1818 <parameter>in</parameter> 1819 </methodparam> 1820 <methodparam> 1821 <type>boolean</type> 1822 <parameter>overwrite</parameter> 1823 </methodparam> 1824 <methodparam> 1825 <type>AbsoluteProgressReporter</type> 1826 <parameter>progress</parameter> 1827 </methodparam> 1828 <exceptionname>IOException</exceptionname> 1829 <exceptionname>BaseException</exceptionname> 1830 </methodsynopsis> 1831 </term> 1832 <listitem> 1833 <para> 1834 Unpack the files and store them in the BASE file system. 1835 1836 <itemizedlist> 1837 <listitem> 1838 <para> 1839 Do not <methodname>close()</methodname> or 1840 <methodname>commit()</methodname> the 1841 <classname>DbControl</classname> passed to this method. 1842 This is done automatically by the 1843 <classname>AbstractFileUnpacker</classname> or by the web client. 1844 </para> 1845 </listitem> 1846 1847 <listitem> 1848 <para> 1849 The <varname>dir</varname> parameter is the root directory where 1850 the unpacked files should be placed. If the compressed file 1851 contains subdirectory the plug-in must create those subdirectories 1852 unless they already exists. 1853 </para> 1854 </listitem> 1855 1856 <listitem> 1857 <para> 1858 If the <varname>overwrite</varname> parameter is 1859 <constant>FALSE</constant> no existing file should be overwritten 1860 unless the file is <systemitem>OFFLINE</systemitem>. 1861 </para> 1862 </listitem> 1863 1864 <listitem> 1865 <para> 1866 The <varname>in</varname> parameter is the stream 1867 containing the compressed data. The stream may come 1868 directly from the web upload or from an existing 1869 file in the BASE file system. 1870 </para> 1871 </listitem> 1872 1873 <listitem> 1874 <para> 1875 The <varname>progress</varname> parameter, if not 1876 <constant>null</constant>, should be used to reporter the 1877 progress back to the calling code. The plug-in should count 1878 the number of bytes read from the <varname>in</varname> 1879 stream. 1880 </para> 1881 </listitem> 1882 </itemizedlist> 1883 1884 </para> 1885 </listitem> 1886 </varlistentry> 1887 </variablelist> 1888 1889 <para> 1890 When the compressed file is uncompressed during the file upload 1891 from the web interface, the call sequence to the plug-in is slightly 1892 altered from the standard call sequence described in 1893 <xref linkend="plugin_developer.api.callsequence.execute" />. 1894 1895 <itemizedlist> 1896 <listitem> 1897 <para> 1898 After the plug-in instance has been created, the 1899 <methodname>Plugin.init()</methodname> method is called with <constant>null</constant> 1900 values for both the <varname>configuration</varname> and <varname>job</varname> 1901 parameters. 1902 </para> 1903 </listitem> 1904 1905 <listitem> 1906 <para> 1907 Then, the <methodname>unpack()</methodname> method is called. The 1908 <methodname>Plugin.run()</methodname> method is never called in this case. 1909 The <methodname>Plugin.done()</methodname> method is also never called. 1910 </para> 1911 </listitem> 1912 1913 </itemizedlist> 1914 1915 </para> 1916 1721 1917 </sect2> 1722 1918 </sect1>
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