/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
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 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
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 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
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 */

package org.apache.tools.ant.taskdefs;

import org.apache.tools.ant.*;
import org.apache.tools.ant.types.*;

import java.util.Vector;
import java.io.File;
import java.io.IOException;

/**
 * Executes a given command, supplying a set of files as arguments. 
 *
 * @author <a href="mailto:stefan.bodewig@epost.de">Stefan Bodewig</a> 
 * @author <a href="mailto:mariusz@rakiura.org">Mariusz Nowostawski</a> 
 */
public class ExecuteOn extends ExecTask {

    protected Vector filesets = new Vector();
    private boolean parallel = false;
    protected String type = "file";
    protected Commandline.Marker srcFilePos = null;

    /**
     * Adds a set of files (nested fileset attribute).
     */
    public void addFileset(FileSet set) {
        filesets.addElement(set);
    }

    /**
     * Shall the command work on all specified files in parallel?
     */
    public void setParallel(boolean parallel) {
        this.parallel = parallel;
    }

    /**
     * Shall the command work only on files, directories or both?
     */
    public void setType(FileDirBoth type) {
        this.type = type.getValue();
    }

    /**
     * Marker that indicates where the name of the source file should
     * be put on the command line.
     */
    public Commandline.Marker createSrcfile() {
        if (srcFilePos != null) {
            throw new BuildException(taskType + " doesn\'t support multiple srcfile elements.",
                                     location);
        }
        srcFilePos = cmdl.createMarker();
        return srcFilePos;
    }

    protected void checkConfiguration() {
        super.checkConfiguration();
        if (filesets.size() == 0) {
            throw new BuildException("no filesets specified", location);
        }
    }

    protected void runExec(Execute exe) throws BuildException {
        try {

            Vector v = new Vector();
            for (int i=0; i<filesets.size(); i++) {
                FileSet fs = (FileSet) filesets.elementAt(i);
                DirectoryScanner ds = fs.getDirectoryScanner(project);

                if (!"dir".equals(type)) {
                    String[] s = ds.getIncludedFiles();
                    for (int j=0; j<s.length; j++) {
                        v.addElement(new File(fs.getDir(project), s[j]).getAbsolutePath());
                    }
                }

                if (!"file".equals(type)) {
                    String[] s = ds.getIncludedDirectories();
                    for (int j=0; j<s.length; j++) {
                        v.addElement(new File(fs.getDir(project), s[j]).getAbsolutePath());
                    }
                }
            }

            String[] s = new String[v.size()];
            v.copyInto(s);

            int err = -1;

            if (parallel) {
                String[] command = getCommandline(s);
                log("Executing " + Commandline.toString(command), Project.MSG_VERBOSE);
                exe.setCommandline(command);
                err = exe.execute();
                if (err != 0) {
                    if (failOnError) {
                        throw new BuildException("Exec returned: "+err, 
                                                 location);
                    } else {
                        log("Result: " + err, Project.MSG_ERR);
                    }
                }

            } else {
                for (int i=0; i<s.length; i++) {
                    String[] command = getCommandline(s[i]);
                    log("Executing " + Commandline.toString(command), Project.MSG_VERBOSE);
                    exe.setCommandline(command);
                    err = exe.execute();
                    if (err != 0) {
                        if (failOnError) {
                            throw new BuildException("Exec returned: "+err, 
                                                     location);
                        } else {
                            log("Result: " + err, Project.MSG_ERR);
                        }
                    }
                }
            }

        } catch (IOException e) {
            throw new BuildException("Execute failed: " + e, e, location);
        } finally {
            // close the output file if required
            logFlush();
        }
    }

    /**
     * Construct the command line for parallel execution.
     *
     * @param srcFiles The filenames to add to the commandline
     */
    protected String[] getCommandline(String[] srcFiles) {
        String[] orig = cmdl.getCommandline();
        String[] result = new String[orig.length+srcFiles.length];

        int index = orig.length;
        if (srcFilePos != null) {
            index = srcFilePos.getPosition();
        }
        System.arraycopy(orig, 0, result, 0, index);
        System.arraycopy(srcFiles, 0, result, index, srcFiles.length);
        System.arraycopy(orig, index, result, index+srcFiles.length, 
                         orig.length-index);
        return result;
    }

    /**
     * Construct the command line for serial execution.
     *
     * @param srcFile The filename to add to the commandline
     */
    protected String[] getCommandline(String srcFile) {
        return getCommandline(new String[] {srcFile});
    }

    /**
     * Enumerated attribute with the values "file", "dir" and "both"
     * for the type attribute.  
     */
    public static class FileDirBoth extends EnumeratedAttribute {
        public String[] getValues() {
            return new String[] {"file", "dir", "both"};
        }
    }

}