1 /*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 package compiler.compilercontrol.share;
25
26 import java.io.FileNotFoundException;
27 import java.io.PrintStream;
28 import java.util.Objects;
29 import java.util.Stack;
30
31 /**
32 * Simple JSON file writer
33 */
34 public class JSONFile {
35 private final Stack<Element> stack;
36 private final String fileName;
37 private final PrintStream out;
38 private int spaces;
39
40 /**
41 * JSON element
42 */
43 public enum Element {
44 OBJECT,
45 ARRAY,
46 PAIR,
47 VALUE
48 }
49
50 /**
51 * Constructor. Creates file with default name
52 */
53 public JSONFile() {
54 this("directives_file.json");
55 }
56
57 /**
58 * Constructor
59 *
60 * @param fileName file name
61 */
62 public JSONFile(String fileName) {
63 this.spaces = 0;
64 this.stack = new Stack<>();
65 this.fileName = fileName;
66 try {
67 out = new PrintStream(fileName);
68 } catch (FileNotFoundException e) {
69 throw new Error("TESTBUG: can't open/create file " + fileName, e);
70 }
71 }
72
73 /**
74 * Gets file name
75 *
76 * @return file name string
77 */
78 public String getFileName() {
79 return fileName;
80 }
81
82 /**
83 * Gets current JSON element in the file.
84 * The element is a current {@linkplain Element}
85 * that was written into a file.
86 *
87 * @return the type of the current element,
88 * or null if there are nothing written
89 */
90 public Element getElement() {
91 if (stack.empty()) {
92 return null;
93 }
94 return stack.peek();
95 }
96
97 /**
98 * Writes given type with a value to file.
99 * Note that only PAIR and VALUE types accept a single value parameter.
100 * OBJECT and ARRAY do not have a value
101 *
102 * @param element JSON element type
103 * @param value element's value
104 * @return this file instance
105 */
106 public JSONFile write(Element element, String... value) {
107 if (value.length > 1) {
108 throw new Error("TESTBUG: Unexpected value length: "
109 + value.length);
110 }
111 if (!stack.empty()) {
112 if (stack.peek() == Element.VALUE) {
113 out.print(", ");
114 stack.pop();
115 }
116 }
117 switch (element) {
118 case OBJECT:
119 out.print("{");
120 spaces++;
121 stack.push(Element.VALUE);
122 break;
123 case ARRAY:
124 out.print("[");
125 stack.push(Element.VALUE);
126 break;
127 case PAIR:
128 fillSpaces();
129 Objects.requireNonNull(value, "TESTBUG: " + element
130 + "requires a value to be set");
131 out.print(value[0] + ": ");
132 break;
133 case VALUE:
134 Objects.requireNonNull(value, "TESTBUG: " + element
135 + "requires a value to be set");
136 out.print(value[0]);
137 break;
138 }
139 stack.push(element);
140 return this;
141 }
142
143 private void fillSpaces() {
144 out.println();
145 for (int i = 0; i < spaces; i++) {
146 // Fill with spaces to be more readable
147 out.print(" ");
148 }
149 }
150
151 /**
152 * Ends current object or array of {@linkplain Element}
153 *
154 * @return this file instance
155 */
156 public JSONFile end() {
157 if (!stack.empty()) {
158 Element prev = stack.pop();
159 while (prev != Element.OBJECT && prev != Element.ARRAY
160 && !stack.empty()) {
161 prev = stack.pop();
162 }
163 switch (prev) {
164 case OBJECT:
165 spaces--;
166 fillSpaces();
167 out.print("}");
168 break;
169 case ARRAY:
170 out.print("]");
171 break;
172 default:
173 throw new Error("TESTBUG: Incorrect end. " +
174 "Wrong type found: " + prev);
175 }
176 } else {
177 throw new Error("TESTBUG: Incorrect end. Empty stack");
178 }
179 return this;
180 }
181 }