Android Open Source - treedo Item

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License

The source code is released under:

DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE Version 2, December 2004 Everyone is permitted to copy and distribute verbatim or modified copies of this license document, ...

Java Source Code

package com.mbonnin.treedo;
//  ww w.j  a  v a 2  s  .  com
import android.content.Context;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Stack;

/**
 * Created by martin on 14/08/14.
 */
public class Item {
    public static final int TYPE_FOLDER = 0;
    public static final int TYPE_ITEM = 1;
    public String text;
    public boolean checked;
    public ArrayList<Item> children;
    public boolean isAFolder;
    public boolean isTrash;
    public boolean isRoot;

    public Item() {
        children = new ArrayList<Item>();
        text = "";
    }

    public Item shallowCopy() {
        Item clone = new Item();
        clone.text = text;
        clone.checked = checked;
        clone.isAFolder = isAFolder;
        clone.isRoot = isRoot;
        clone.isTrash = isTrash;

        return clone;
    }

    public Item deepCopy(int depth) {
        Item clone = shallowCopy();
        if (depth > 0) {
            for (Item child:children) {
                clone.children.add(child.deepCopy(depth - 1));
            }
        }
        return clone;
    }


    public void serialize(OutputStream outputStream, int depth) throws IOException {
        String line = "";
        if (checked) {
            line += "X";
        } else {
            line += " ";
        }
        for (int i = 0; i < depth; i++) {
            line += "    ";
        }
        line += Utils.encode(text);
        line += "\n";
        outputStream.write(line.getBytes());

        for (Item child:children){
            child.serialize(outputStream, depth + 1);
        }
    }

    public void serialize(OutputStream outputStream) throws IOException {
        // We do not want the
        for (Item child: children) {
            child.serialize(outputStream, 0);
        }
    }

    static public Item deserialize(InputStream inputStream) throws IOException {
        BufferedReader r = new BufferedReader(new InputStreamReader(inputStream));
        String line;
        Stack<Item> itemStack = new Stack<Item>();

        Item root = Item.createRoot();
        root.isAFolder = true;
        itemStack.push(root);
        Item item;
        Item lastItem = root;
        int depth = 0;
        while ((line = r.readLine()) != null) {
            item = new Item();
            if (line.startsWith("X")) {
                item.checked = true;
            } else if (line.startsWith(" ")) {
                item.checked = false;
            } else {
                Utils.log("line should start by X or space: " + line);
                continue;
            }

            int spaceCount = 0;
            int i = 1;
            while (i < line.length() && line.charAt(i++) == ' ') {
                spaceCount++;
            }

            if (i == line.length()) {
                // empty line, ignore
                continue;
            }

            item.text = Utils.decode(line.substring(i - 1));

            if (spaceCount < depth) {
                while (depth > spaceCount) {
                    depth -= 4;
                    itemStack.pop();
                }
                if (depth != spaceCount) {
                    Utils.log("bad number of spaces: " + line);
                }
                addChild(itemStack, item);
            } else if (spaceCount == depth) {
                addChild(itemStack, item);
            } else if (spaceCount == depth + 4) {
                itemStack.push(lastItem);
                addChild(itemStack, item);
            } else {
                Utils.log("bad number of spaces: " + line);
                continue;
            }

            depth = spaceCount;
            lastItem = item;
        }

        detectDirectories(root);
        return root;
    }

    private static void detectDirectories(Item item) {
        boolean containsADirectory = false;
        for (Item child:item.children) {
            detectDirectories(child);
            if (child.isAFolder) {
                containsADirectory = true;
            }
        }

        if (containsADirectory) {
            for (Item child:item.children) {
                child.isAFolder = true;
            }
        }
    }

    private static void addChild(Stack<Item> itemStack, Item item) {
        Item parent = itemStack.peek();
        parent.isAFolder = true;
        parent.children.add(item);
    }

    public Item findOrCreateTrash(Context context) {
        Item trash = null;

        for (Item child:children) {
            if (child.isTrash) {
                trash = child;
                break;
            }
        }
        if (trash == null) {
            for (Item child:children) {
                if (child.text.equals(context.getString(R.string.trash))) {
                    trash = child;
                    break;
                }
            }
        }

        if (trash == null) {
            trash = new Item();
            trash.isAFolder = true;
            trash.isTrash = true;
            trash.text = context.getString(R.string.trash);
            children.add(0, trash);
        }

        return trash;
    }

    public static Item createRoot() {
        Item item = new Item();
        item.isAFolder = true;
        item.text = "root";
        item.isRoot = true;

        return item;
    }
}

Java Source Code List

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