1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.geometry.io.euclidean.threed.stl;
18
19 import java.nio.ByteOrder;
20 import java.nio.charset.Charset;
21 /*
22 * Licensed to the Apache Software Foundation (ASF) under one or more
23 * contributor license agreements. See the NOTICE file distributed with
24 * this work for additional information regarding copyright ownership.
25 * The ASF licenses this file to You under the Apache License, Version 2.0
26 * (the "License"); you may not use this file except in compliance with
27 * the License. You may obtain a copy of the License at
28 *
29 * http://www.apache.org/licenses/LICENSE-2.0
30 *
31 * Unless required by applicable law or agreed to in writing, software
32 * distributed under the License is distributed on an "AS IS" BASIS,
33 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
34 * See the License for the specific language governing permissions and
35 * limitations under the License.
36 */
37 import java.nio.charset.StandardCharsets;
38
39 /** Class containing constants for the STL file format.
40 */
41 final class StlConstants {
42
43 /** Default STL charset. */
44 static final Charset DEFAULT_CHARSET = StandardCharsets.UTF_8;
45
46 /** Keyword indicating the start of a solid. This is also the keyword used to indicate the
47 * start of a text (ASCII) STL file.
48 */
49 static final String SOLID_START_KEYWORD = "solid";
50
51 /** Keyword used to indicate the end of a solid definition. */
52 static final String SOLID_END_KEYWORD = "endsolid";
53
54 /** Keyword used to indicate the start of a facet. */
55 static final String FACET_START_KEYWORD = "facet";
56
57 /** Keyword used to indicate the end of a facet. */
58 static final String FACET_END_KEYWORD = "endfacet";
59
60 /** Keyword used to introduce a facet normal. */
61 static final String NORMAL_KEYWORD = "normal";
62
63 /** Keyword used when describing the outer vertex loop of a facet. */
64 static final String OUTER_KEYWORD = "outer";
65
66 /** Keyword used to indicate the start of a vertex loop. */
67 static final String LOOP_START_KEYWORD = "loop";
68
69 /** Keyword used to indicate the end of a vertex loop. */
70 static final String LOOP_END_KEYWORD = "endloop";
71
72 /** Keyword used to indicate a vertex definition. */
73 static final String VERTEX_KEYWORD = "vertex";
74
75 /** Number of bytes in the binary format header. */
76 static final int BINARY_HEADER_BYTES = 80;
77
78 /** Number of bytes for each triangle in the binary format. */
79 static final int BINARY_TRIANGLE_BYTES = 50;
80
81 /** Byte order for binary data. */
82 static final ByteOrder BINARY_BYTE_ORDER = ByteOrder.LITTLE_ENDIAN;
83
84 /** Utility class; no instantiation. */
85 private StlConstants() {}
86 }