source: trunk/de.ugoe.cs.swe.memos/src/de/ugoe/cs/swe/memos/xml/SAXHandler.java

package de.ugoe.cs.swe.memos.xml;

import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Vector;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import de.ugoe.cs.swe.memos.datamodel.Category;
import de.ugoe.cs.swe.memos.datamodel.File;
import de.ugoe.cs.swe.memos.datamodel.Memo;
import de.ugoe.cs.swe.memos.datamodel.Tag;
import de.ugoe.cs.swe.memos.misc.Base64Coder;

public class SAXHandler extends DefaultHandler {

        public static final int NONE = 0;
        public static final int TITLE = 1;
        public static final int AUTHOR = 2;
        public static final int TAGS = 4;
        public static final int CONTENT = 8;
        public static final int ATTACHEMENT = 16;

        private int state = NONE;
        private String content;

        private Vector<Memo> memos;
        private Vector<Category> categories;
        private HashMap<Long, Category> map;

        private Category category;
        private Memo memo;
        private File attachement;

        SAXHandler(Vector<Memo> memos) {
                this.memos = memos;
                this.memos.clear();
                this.categories = new Vector<Category>();
                this.map = new HashMap<Long, Category>();
        }

        @Override
        public void startElement(String uri, String localName, String qName,
                        Attributes attributes) throws SAXException {

                if (qName.equals("category")) {
                        this.category = new Category("");
                        this.category.setiD(Long.parseLong(attributes.getValue("id")));
                        this.category.setParentID(Long.parseLong(attributes
                                        .getValue("parent")));

                        this.categories.add(this.category);
                }

                if (qName.equals("memo")) {
                        this.memo = new Memo("", Boolean.parseBoolean(attributes
                                        .getValue("draft")));
                        this.memo.setiD(Long.parseLong(attributes.getValue("id")));
                        this.memo.setTimestamp(new Date(Long.parseLong(attributes
                                        .getValue("timestamp"))));
                        this.memo.setCategoryID(Long.parseLong(attributes
                                        .getValue("category")));
                        this.memo.setCategory(this.map.get(this.memo.getCategoryID()));
                        this.memo.setAllCategories(this.categories);
                        this.memos.add(this.memo);
                }

                if (qName.equals("title"))
                        this.state = SAXHandler.TITLE;

                if (qName.equals("author"))
                        this.state = SAXHandler.AUTHOR;

                if (qName.equals("tags"))
                        this.state = SAXHandler.TAGS;

                if (qName.equals("content")) {
                        this.state = SAXHandler.CONTENT;
                        this.content = "";
                }

                if (qName.equals("attachements")) {
                        this.memo.setFiles(new ArrayList<File>());
                }

                if (qName.equals("attachement")) {
                        this.state = SAXHandler.ATTACHEMENT;
                        this.attachement = new File();
                        this.attachement.memo = this.memo;
                        this.attachement.name = Base64Coder.decodeString(attributes
                                        .getValue("name"));
                        this.memo.getFiles().add(this.attachement);
                        this.content = "";
                }
        }

        @Override
        public void endElement(String uri, String localName, String qName)
                        throws SAXException {

                if (qName.equals("category")) {
                        this.category = null;
                }

                if (qName.equals("memo")) {
                        this.memo = null;
                }

                if (qName.equals("categories")) {
                        Iterator<Category> iterator = this.categories.iterator();

                        while (iterator.hasNext()) {
                                Category current = iterator.next();

                                for (int i = 0; i < this.categories.size(); i++) {
                                        if (this.categories.elementAt(i).getiD().equals(
                                                        current.getParentID()))
                                                current.setParentCategory(this.categories.elementAt(i));
                                        else if (this.categories.elementAt(i).getParentID().equals(
                                                        current.getiD()))
                                                current.getChildCategories().add(
                                                                this.categories.elementAt(i));
                                }
                                this.map.put(current.getiD(), current);
                        }
                }

                if (qName.equals("content") && this.content.length() > 0) {
                        this.memo.setContent(Base64Coder.decodeString(this.content));
                        this.content = null;
                }

                if (qName.equals("attachement") && this.attachement != null) {
                        this.attachement.content = Base64Coder
                                        .decode(content.toCharArray());
                        this.attachement = null;
                        this.content = null;
                }
        }

        @Override
        public void characters(char[] ch, int start, int length)
                        throws SAXException {

                String data = (new String(ch)).substring(start, start + length).trim();
                if (data.length() > 0) {
                        if (this.category != null)
                                this.category.setName(Base64Coder.decodeString(data));

                        if (this.memo != null)
                                switch (this.state) {
                                case TITLE:
                                        this.memo.setTitle(Base64Coder.decodeString(data));
                                        break;
                                case AUTHOR:
                                        this.memo.setAuthor(Base64Coder.decodeString(data));
                                        break;
                                case CONTENT:
                                case ATTACHEMENT:
                                        this.content = this.content.concat(data);
                                        break;
                                case TAGS:
                                        String[] tags = Base64Coder.decodeString(data).split("\0");

                                        for (int x = 0; x < tags.length; x++) {
                                                Tag temp2 = new Tag(tags[x]);
                                                temp2.setMemo(this.memo);
                                                temp2.setMemoID(this.memo.getiD());
                                                this.memo.getTags().add(temp2);
                                        }
                                        break;
                                }
                }
        }

        @Override
        public void endDocument() throws SAXException {
                super.endDocument();
        }
}