source: trunk/greenstone3-extensions/gs3build/src/org/greenstone/gsdl3/gs3build/expander/ZipExpander.java@ 12188

package org.greenstone.gsdl3.gs3build.expander;

import java.io.*;
import java.net.URL;
import java.util.*;

import org.greenstone.gsdl3.gs3build.BuildManager;

public class ZipExpander implements ExpanderInterface
{ BuildManager buildManager;

    public ZipExpander()
    {
    }

    public void configure(BuildManager manager)
    {   this.buildManager = manager;
    }

    public boolean expandFile(URL url, java.io.File expansionDirectory)
    { if (url.toString().startsWith("file://")) 
        {   String fileName = url.toString().substring(7);

            if (fileName.endsWith(".zip"))
          { System.out.println("Expanding Zip file " + fileName);

                // determine which directory to use

                // get the leaf name
                String leafName;
                int leafAt = fileName.lastIndexOf(System.getProperty("file.separator"));
                
                if (leafAt >= 0)
                { leafName = fileName.substring(leafAt+1);
                }
                else
                {   leafName = fileName;
                }

              int extensionAt = leafName.lastIndexOf('.');
                if (extensionAt >= 0)
                {   leafName = leafName.substring(0, extensionAt);
                }

                File targetDir = new File(expansionDirectory, leafName);
                if (targetDir.exists())
                {   // find alternative name
                    int  extension = 1;
                    File expandedTarget;

                    do
                    { expandedTarget = new File(targetDir.toString() + Integer.toString(extension));
                    } while (expandedTarget.exists());

                    targetDir = expandedTarget;
                }
                if (!targetDir.mkdir())
                {   // TODO: pass/log error - unable to make directory to
                    //       expand file.
                    return false;
                }

                // Call zip expansion
                try
                {
                    Runtime.getRuntime().exec("unzip -d "+targetDir.toString());
                }
                catch (IOException io)
                { // TODO: handle errors - report to log, etc.
                    return false;
                }

                // ensure that the build manager knows about the new directory,
                // and will expand any content in it, etc. in turn
                this.buildManager.addInputDirectory(targetDir.toString());
                return true;
            }
        }
        return false;
    }
}