001/**
002 * Logback: the reliable, generic, fast and flexible logging framework.
003 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
004 *
005 * This program and the accompanying materials are dual-licensed under
006 * either the terms of the Eclipse Public License v1.0 as published by
007 * the Eclipse Foundation
008 *
009 *   or (per the licensee's choosing)
010 *
011 * under the terms of the GNU Lesser General Public License version 2.1
012 * as published by the Free Software Foundation.
013 */
014package ch.qos.logback.core.joran.spi;
015
016import java.util.ArrayList;
017import java.util.List;
018
019/**
020 * An element path characterizes a traversal path in an XML document.
021 *
022 * @author Ceki Gulcu
023 * @since 1.1.0
024 */
025public class ElementPath {
026    
027    ArrayList<String> partList = new ArrayList<String>();
028
029    public ElementPath() {
030    }
031
032    public ElementPath(List<String> list) {
033        partList.addAll(list);
034    }
035
036    /**
037     * Build an elementPath from a string.
038     * <p>
039     * Note that "/x" is considered equivalent to "x" and to "x/"
040     */
041    public ElementPath(String pathStr) {
042        if (pathStr == null) {
043            return;
044        }
045
046        String[] partArray = pathStr.split("/");
047        if (partArray == null)
048            return;
049
050        for (String part : partArray) {
051            if (part.length() > 0) {
052                partList.add(part);
053            }
054        }
055    }
056
057    public ElementPath duplicate() {
058        ElementPath p = new ElementPath();
059        p.partList.addAll(this.partList);
060        return p;
061    }
062
063    // Joran error skipping relies on the equals method
064    @Override
065    public boolean equals(Object o) {
066        if ((o == null) || !(o instanceof ElementPath)) {
067            return false;
068        }
069
070        ElementPath r = (ElementPath) o;
071
072        if (r.size() != size()) {
073            return false;
074        }
075
076        int len = size();
077
078        for (int i = 0; i < len; i++) {
079            if (!equalityCheck(get(i), r.get(i))) {
080                return false;
081            }
082        }
083
084        // if everything matches, then the two patterns are equal
085        return true;
086    }
087
088    private boolean equalityCheck(String x, String y) {
089        return x.equalsIgnoreCase(y);
090    }
091
092    public List<String> getCopyOfPartList() {
093        return new ArrayList<String>(partList);
094    }
095
096    public void push(String s) {
097        partList.add(s);
098    }
099
100    public String get(int i) {
101        return (String) partList.get(i);
102    }
103
104    public void pop() {
105        if (!partList.isEmpty()) {
106            partList.remove(partList.size() - 1);
107        }
108    }
109
110    public String peekLast() {
111        if (!partList.isEmpty()) {
112            int size = partList.size();
113            return (String) partList.get(size - 1);
114        } else {
115            return null;
116        }
117    }
118
119    public int size() {
120        return partList.size();
121    }
122
123    protected String toStableString() {
124        StringBuilder result = new StringBuilder();
125        for (String current : partList) {
126            result.append("[").append(current).append("]");
127        }
128        return result.toString();
129    }
130
131    @Override
132    public String toString() {
133        return toStableString();
134    }
135}