13 * http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 */
21
22 package com.sun.org.apache.bcel.internal.classfile;
23
24 import java.io.DataInput;
25 import java.io.DataOutputStream;
26 import java.io.IOException;
27
28 /**
29 * This class represents a (PC offset, line number) pair, i.e., a line number in
30 * the source that corresponds to a relative address in the byte code. This
31 * is used for debugging purposes.
32 *
33 * @version $Id$
34 * @see LineNumberTable
35 */
36 public final class LineNumber implements Cloneable, Node {
37
38 /** Program Counter (PC) corresponds to line */
39 private short start_pc;
40
41 /** number in source file */
42 private short line_number;
43
44 /**
45 * Initialize from another object.
46 *
47 * @param c the object to copy
48 */
49 public LineNumber(final LineNumber c) {
50 this(c.getStartPC(), c.getLineNumber());
51 }
52
53
54 /**
55 * Construct object from file stream.
56 *
57 * @param file Input stream
58 * @throws IOEXception if an I/O Exception occurs in readUnsignedShort
59 */
60 LineNumber(final DataInput file) throws IOException {
61 this(file.readUnsignedShort(), file.readUnsignedShort());
62 }
63
64
65 /**
66 * @param start_pc Program Counter (PC) corresponds to
67 * @param line_number line number in source file
68 */
69 public LineNumber(final int start_pc, final int line_number) {
70 this.start_pc = (short) start_pc;
71 this.line_number = (short)line_number;
72 }
73
74
75 /**
76 * Called by objects that are traversing the nodes of the tree implicitely
77 * defined by the contents of a Java class. I.e., the hierarchy of methods,
78 * fields, attributes, etc. spawns a tree of objects.
79 *
80 * @param v Visitor object
81 */
82 @Override
83 public void accept( final Visitor v ) {
84 v.visitLineNumber(this);
85 }
86
87
88 /**
89 * Dump line number/pc pair to file stream in binary format.
90 *
91 * @param file Output file stream
92 * @throws IOEXception if an I/O Exception occurs in writeShort
93 */
94 public final void dump( final DataOutputStream file ) throws IOException {
95 file.writeShort(start_pc);
96 file.writeShort(line_number);
97 }
98
99
100 /**
101 * @return Corresponding source line
102 */
103 public final int getLineNumber() {
104 return 0xffff & line_number;
105 }
106
107
108 /**
109 * @return PC in code
110 */
111 public final int getStartPC() {
112 return 0xffff & start_pc;
113 }
114
115
116 /**
117 * @param line_number the source line number
118 */
119 public final void setLineNumber( final int line_number ) {
120 this.line_number = (short) line_number;
121 }
122
123
124 /**
125 * @param start_pc the pc for this line number
126 */
127 public final void setStartPC( final int start_pc ) {
128 this.start_pc = (short) start_pc;
129 }
130
131
132 /**
133 * @return String representation
134 */
135 @Override
136 public final String toString() {
137 return "LineNumber(" + start_pc + ", " + line_number + ")";
138 }
139
140
141 /**
142 * @return deep copy of this object
143 */
144 public LineNumber copy() {
145 try {
146 return (LineNumber) clone();
147 } catch (final CloneNotSupportedException e) {
148 // TODO should this throw?
149 }
150 return null;
151 }
152 }
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13 * http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 */
21
22 package com.sun.org.apache.bcel.internal.classfile;
23
24 import java.io.DataInput;
25 import java.io.DataOutputStream;
26 import java.io.IOException;
27
28 /**
29 * This class represents a (PC offset, line number) pair, i.e., a line number in
30 * the source that corresponds to a relative address in the byte code. This
31 * is used for debugging purposes.
32 *
33 * @see LineNumberTable
34 */
35 public final class LineNumber implements Cloneable, Node {
36
37 /** Program Counter (PC) corresponds to line */
38 private short start_pc;
39
40 /** number in source file */
41 private short line_number;
42
43 /**
44 * Initialize from another object.
45 *
46 * @param c the object to copy
47 */
48 public LineNumber(final LineNumber c) {
49 this(c.getStartPC(), c.getLineNumber());
50 }
51
52
53 /**
54 * Construct object from file stream.
55 *
56 * @param file Input stream
57 * @throws IOException if an I/O Exception occurs in readUnsignedShort
58 */
59 LineNumber(final DataInput file) throws IOException {
60 this(file.readUnsignedShort(), file.readUnsignedShort());
61 }
62
63
64 /**
65 * @param start_pc Program Counter (PC) corresponds to
66 * @param line_number line number in source file
67 */
68 public LineNumber(final int start_pc, final int line_number) {
69 this.start_pc = (short) start_pc;
70 this.line_number = (short)line_number;
71 }
72
73
74 /**
75 * Called by objects that are traversing the nodes of the tree implicitely
76 * defined by the contents of a Java class. I.e., the hierarchy of methods,
77 * fields, attributes, etc. spawns a tree of objects.
78 *
79 * @param v Visitor object
80 */
81 @Override
82 public void accept( final Visitor v ) {
83 v.visitLineNumber(this);
84 }
85
86
87 /**
88 * Dump line number/pc pair to file stream in binary format.
89 *
90 * @param file Output file stream
91 * @throws IOException if an I/O Exception occurs in writeShort
92 */
93 public void dump( final DataOutputStream file ) throws IOException {
94 file.writeShort(start_pc);
95 file.writeShort(line_number);
96 }
97
98
99 /**
100 * @return Corresponding source line
101 */
102 public int getLineNumber() {
103 return 0xffff & line_number;
104 }
105
106
107 /**
108 * @return PC in code
109 */
110 public int getStartPC() {
111 return 0xffff & start_pc;
112 }
113
114
115 /**
116 * @param line_number the source line number
117 */
118 public void setLineNumber( final int line_number ) {
119 this.line_number = (short) line_number;
120 }
121
122
123 /**
124 * @param start_pc the pc for this line number
125 */
126 public void setStartPC( final int start_pc ) {
127 this.start_pc = (short) start_pc;
128 }
129
130
131 /**
132 * @return String representation
133 */
134 @Override
135 public String toString() {
136 return "LineNumber(" + start_pc + ", " + line_number + ")";
137 }
138
139
140 /**
141 * @return deep copy of this object
142 */
143 public LineNumber copy() {
144 try {
145 return (LineNumber) clone();
146 } catch (final CloneNotSupportedException e) {
147 // TODO should this throw?
148 }
149 return null;
150 }
151 }
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