/*
 *  eXist Open Source Native XML Database
 *  Copyright (C) 2010 The eXist Project
 *  http://exist-db.org
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *  $Id$
 */
package org.exist.ant;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;

import org.xmldb.api.DatabaseManager;
import org.xmldb.api.base.Collection;
import org.xmldb.api.base.XMLDBException;

/**
 * an ant task to list the sub-collections or resources in a collection
 *
 * @author peter.klotz@blue-elephant-systems.com
 */
public class XMLDBListTask extends AbstractXMLDBTask {

    private boolean hasCollections = false;
    private boolean hasResources = false;
    private String separator = ",";
    private String outputproperty;

    /* (non-Javadoc)
     * @see org.apache.tools.ant.Task#execute()
     */
    public void execute() throws BuildException {
        if (uri == null) {
            throw new BuildException("You have to specify an XMLDB collection URI");
        }

        if (hasCollections == false && hasResources == false) {
            throw new BuildException("You have at least one of collections or resources or both");
        }

        registerDatabase();
        try {
            log("Get base collection: " + uri, Project.MSG_DEBUG);
            Collection base = DatabaseManager.getCollection(uri, user, password);

            if (base == null) {
                String msg = "Collection " + uri + " could not be found.";
                if (failonerror) {
                    throw new BuildException(msg);
                } else {
                    log(msg, Project.MSG_ERR);
                }
            }

            StringBuilder buffer = new StringBuilder();
            
            if (hasCollections) {
                String[] childCollections = base.listChildCollections();
                if (childCollections != null) {
                    log("Listing child collections", Project.MSG_DEBUG);
                    boolean isFirst=true;
                    
                    for (String col : childCollections) {
                        // only insert separator for 2nd or later item
                        if(isFirst){
                            isFirst=false;
                        } else {
                            buffer.append(separator);
                        }

                        buffer.append(col);
                    }
                }
            }

            if (hasResources) {
                log("Listing resources", Project.MSG_DEBUG);
                String[] resources = base.listResources();
                if (resources != null) {
                    if (buffer.length() > 0) {
                        buffer.append(separator);
                    }

                    boolean isFirst=true;
                    for (String resource : resources) {
                        // only insert separator for 2nd or later item
                        if(isFirst){
                            isFirst=false;
                        } else {
                            buffer.append(separator);
                        }

                        buffer.append(resource);
                    }
                }
            }

            if (buffer.length() > 0) {
                log("Set property " + outputproperty, Project.MSG_INFO);
                getProject().setNewProperty(outputproperty, buffer.toString());
            }
            
        } catch (XMLDBException e) {
            String msg = "XMLDB exception during list: " + e.getMessage();
            if (failonerror) {
                throw new BuildException(msg, e);
            } else {
                log(msg, e, Project.MSG_ERR);
            }
        }
    }

    public void setCollections(boolean collections) {
        this.hasCollections = collections;
    }

    public void setResources(boolean resources) {
        this.hasResources = resources;
    }

    public void setSeparator(String separator) {
        this.separator = separator;
    }

    public void setOutputproperty(String outputproperty) {
        this.outputproperty = outputproperty;
    }
}