1 ////////////////////////////////////////////////////////////////////////////////
2 // checkstyle: Checks Java source code for adherence to a set of rules.
3 // Copyright (C) 2001-2015 the original author or authors.
4 //
5 // This library is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU Lesser General Public
7 // License as published by the Free Software Foundation; either
8 // version 2.1 of the License, or (at your option) any later version.
9 //
10 // This library is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // Lesser General Public License for more details.
14 //
15 // You should have received a copy of the GNU Lesser General Public
16 // License along with this library; if not, write to the Free Software
17 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 ////////////////////////////////////////////////////////////////////////////////
19 package com.puppycrawl.tools.checkstyle.api;
20
21 /**
22 * Represents a full identifier, including dots, with associated
23 * position information.
24 *
25 * <p>
26 * Identifiers such as <code>java.util.HashMap</code> are spread across
27 * multiple AST nodes in the syntax tree (three IDENT nodes, two DOT nodes).
28 * A FullIdent represents the whole String (excluding any intermediate
29 * whitespace), which is often easier to work with in Checks.
30 * </p>
31 *
32 * @author Oliver Burn
33 * @see TokenTypes#DOT
34 * @see TokenTypes#IDENT
35 **/
36 public final class FullIdent
37 {
38 /** the string **/
39 private final StringBuffer buffer = new StringBuffer();
40 /** the line number **/
41 private int lineNo;
42 /** the column number **/
43 private int colNo;
44
45 /** hide default constructor */
46 private FullIdent()
47 {
48 }
49
50 /** @return the text **/
51 public String getText()
52 {
53 return buffer.toString();
54 }
55
56 /** @return the line number **/
57 public int getLineNo()
58 {
59 return lineNo;
60 }
61
62 /** @return the column number **/
63 public int getColumnNo()
64 {
65 return colNo;
66 }
67
68 /**
69 * Append the specified text.
70 * @param text the text to append
71 */
72 private void append(String text)
73 {
74 buffer.append(text);
75 }
76
77 /**
78 * Append the specified token and also recalibrate the first line and
79 * column.
80 * @param ast the token to append
81 */
82 private void append(DetailAST ast)
83 {
84 buffer.append(ast.getText());
85 if (lineNo == 0) {
86 lineNo = ast.getLineNo();
87 }
88 else if (ast.getLineNo() > 0) {
89 lineNo = Math.min(lineNo, ast.getLineNo());
90 }
91 // TODO: make a function
92 if (colNo == 0) {
93 colNo = ast.getColumnNo();
94 }
95 else if (ast.getColumnNo() > 0) {
96 colNo = Math.min(colNo, ast.getColumnNo());
97 }
98 }
99
100 /**
101 * Creates a new FullIdent starting from the specified node.
102 * @param ast the node to start from
103 * @return a <code>FullIdent</code> value
104 */
105 public static FullIdent createFullIdent(DetailAST ast)
106 {
107 final FullIdent fi = new FullIdent();
108 extractFullIdent(fi, ast);
109 return fi;
110 }
111
112 /**
113 * Creates a new FullIdent starting from the child of the specified node.
114 * @param ast the parent node from where to start from
115 * @return a <code>FullIdent</code> value
116 */
117 public static FullIdent createFullIdentBelow(DetailAST ast)
118 {
119 return createFullIdent(ast.getFirstChild());
120 }
121
122 /**
123 * Recursively extract a FullIdent.
124 *
125 * @param full the FullIdent to add to
126 * @param ast the node to recurse from
127 */
128 private static void extractFullIdent(FullIdent full, DetailAST ast)
129 {
130 if (ast == null) {
131 return;
132 }
133
134 if (ast.getType() == TokenTypes.DOT) {
135 extractFullIdent(full, ast.getFirstChild());
136 full.append(".");
137 extractFullIdent(
138 full, ast.getFirstChild().getNextSibling());
139 }
140 else {
141 full.append(ast);
142 }
143 }
144
145 @Override
146 public String toString()
147 {
148 return getText() + "[" + getLineNo() + "x" + getColumnNo() + "]";
149 }
150
151 }