fujaba/NetworkParser

package de.uniks.networkparser;

/*
The MIT License

Copyright (c) 2010-2016 Stefan Lindel https://www.github.com/fujaba/NetworkParser/

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
import java.util.List;

import de.uniks.networkparser.buffer.CharacterBuffer;
import de.uniks.networkparser.interfaces.Entity;
import de.uniks.networkparser.list.SimpleList;

public class TextDiff {
    public static final char NEW = '+';
    public static final char NONE = ' ';
    public static final char CHANGE = '#';
    public static final char REMOVE = '-';
    public static final String TO = "->";

    private String key;
    private char type;
    private Object left;
    private Object right;
    private SimpleList<TextDiff> children;

    public TextDiff with(String key, Object left, Object right) {
        this.left = left;
        this.right = right;
        this.key = key;
        if (left == null) {
            if (right == null) {
                this.type = NONE;
            } else {
                this.type = NEW;
            }
        } else {
            if (right == null) {
                this.type = REMOVE;
            } else if (left.equals(right)) {
                this.type = NONE;
            } else {
                this.type = CHANGE;
            }
        }
        return this;
    }

    public TextDiff replaceChild(TextDiff last, String key, Object left, Object right) {
        TextDiff lastChild = null;
        if (this.children != null) {
            TextDiff child = new TextDiff();
            child.with(key, left, right);
            int size = this.children.size();
            int pos = 0;
            if (last != null) {
                pos = this.children.indexOf(last);
            }
            for (int i = pos; i < size; i++) {
                lastChild = this.children.get(pos);
                this.children.remove(pos);
                child.withChild(lastChild);
            }
            this.children.add(child);
        }
        return lastChild;
    }

    public TextDiff getLast() {
        if (this.children != null) {
            return this.children.get(this.children.size() - 1);
        }
        return null;
    }

    public TextDiff withChild(TextDiff child) {
        if (this.children == null) {
            this.children = new SimpleList<TextDiff>();
        }
        this.children.add(child);
        return this;
    }

    public TextDiff withChild(String key, char type, TextDiff child) {
        if (this.children == null) {
            this.children = new SimpleList<TextDiff>();
        }
        this.key = key;
        this.type = type;
        this.children.add(child);
        return this;
    }

    public TextDiff createChild(String key, Object left, Object right) {
        TextDiff child = new TextDiff();
        if (this.children == null) {
            this.children = new SimpleList<TextDiff>();
        }
        this.children.add(child);
        child.with(key, left, right);
        return child;
    }

    public Object getLeft() {
        return left;
    }

    public Object getRight() {
        return right;
    }

    public char getType() {
        return type;
    }

    public String getKey() {
        return key;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append(toString(0, true));
        return sb.toString();
    }

    public String toString(int indentFactor, boolean splitAddAndRemove) {
        CharacterBuffer sb = new CharacterBuffer();
        if (this.children != null) {
            int newIndent = indentFactor;
            if (type != 0 && key != null) {
                sb.with(type);
                sb.withRepeat(" ", indentFactor);
                sb.with(this.key);
                sb.with(Entity.CRLF);
                newIndent += 2;
            }
            for (TextDiff diff : this.children) {
                sb.with(diff.toString(newIndent, splitAddAndRemove));
            }
        } else {
            if (key != null) {
                sb.with(type);
                sb.withRepeat(" ", indentFactor);
                sb.with(this.key + ":");
            }
            if (CHANGE == type) {
                sb.with("" + left);
                sb.with("->");
                sb.with("" + right);
            } else if (NEW == type) {
                if (splitAddAndRemove) {
                    sb.with(splitValue(right, type).toString(indentFactor, false));
                } else {
                    sb.with("" + right);
                }
            } else {
                if (splitAddAndRemove) {
                    sb.with(splitValue(left, type).toString(indentFactor, false));
                } else {
                    /* REMOVE == type || NONE == type */
                    sb.with("" + left);
                }
            }
            sb.with(Entity.CRLF);
        }
        return sb.toString();
    }

    private TextDiff splitValue(Entity item, char type) {
        TextDiff diff = new TextDiff();
        if (item == null) {
            return diff;
        }
        for (int i = 0; i < item.size(); i++) {
            String key = item.getKeyByIndex(i);
            Object value = item.getValue(key);
            if (value instanceof Entity) {
                diff.withChild(key, type, splitValue((Entity) value, type));
            } else if (value instanceof List<?>) {
                diff.withChild(key, type, splitValue((List<?>) value, type));
            } else {
                if (NEW == type) {
                    diff.createChild(key, null, value);
                } else {
                    diff.createChild(key, value, null);
                }
            }
        }
        return diff;
    }

    private TextDiff splitValue(Object item, char type) {
        if (item instanceof Entity) {
            return splitValue((Entity) item, type);
        } else if (item instanceof List<?>) {
            return splitValue((List<?>) item, type);
        }
        TextDiff diff = new TextDiff();
        if (NEW == type) {
            diff.createChild(null, null, item);
        } else {
            diff.createChild(null, item, null);
        }
        return diff;
    }

    private TextDiff splitValue(List<?> item, char type) {
        TextDiff diff = new TextDiff();
        if (item == null) {
            return diff;
        }
        for (int i = 0; i < item.size(); i++) {
            Object value = item.get(i);
            if (value instanceof Entity) {
                diff.withChild(null, type, splitValue((Entity) value, type));
            } else if (value instanceof List<?>) {
                diff.withChild(null, type, splitValue((List<?>) value, type));
            } else {
                if (NEW == type) {
                    diff.createChild(null, null, value);
                } else {
                    diff.createChild(null, value, null);
                }
            }
        }
        return diff;
    }
}