1 /*
2 * Copyright (c) 1998, 2016, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
53
54 /**
55 * Copies the iteration state from this RegionIterator object
56 * into another RegionIterator object to allow multiple iteration
57 * branches from the current position.
58 */
59 public void copyStateFrom(RegionIterator ri) {
60 if (this.region != ri.region) {
61 throw new InternalError("region mismatch");
62 }
63 this.curIndex = ri.curIndex;
64 this.numXbands = ri.numXbands;
65 }
66
67 /**
68 * Moves the iteration state to the beginning of the next
69 * Y range in the region returning true if one is found
70 * and recording the low and high Y coordinates of the
71 * range in the array at locations 1 and 3 respectively.
72 */
73 public boolean nextYRange(int range[]) {
74 curIndex += numXbands * 2;
75 numXbands = 0;
76 if (curIndex >= region.endIndex) {
77 return false;
78 }
79 range[1] = region.bands[curIndex++];
80 range[3] = region.bands[curIndex++];
81 numXbands = region.bands[curIndex++];
82 return true;
83 }
84
85 /**
86 * Moves the iteration state to the beginning of the next
87 * X band in the current Y range returning true if one is
88 * found and recording the low and high X coordinates of
89 * the range in the array at locations 0 and 2 respectively.
90 */
91 public boolean nextXBand(int range[]) {
92 if (numXbands <= 0) {
93 return false;
94 }
95 numXbands--;
96 range[0] = region.bands[curIndex++];
97 range[2] = region.bands[curIndex++];
98 return true;
99 }
100 }
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1 /*
2 * Copyright (c) 1998, 2018, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
53
54 /**
55 * Copies the iteration state from this RegionIterator object
56 * into another RegionIterator object to allow multiple iteration
57 * branches from the current position.
58 */
59 public void copyStateFrom(RegionIterator ri) {
60 if (this.region != ri.region) {
61 throw new InternalError("region mismatch");
62 }
63 this.curIndex = ri.curIndex;
64 this.numXbands = ri.numXbands;
65 }
66
67 /**
68 * Moves the iteration state to the beginning of the next
69 * Y range in the region returning true if one is found
70 * and recording the low and high Y coordinates of the
71 * range in the array at locations 1 and 3 respectively.
72 */
73 public boolean nextYRange(int[] range) {
74 curIndex += numXbands * 2;
75 numXbands = 0;
76 if (curIndex >= region.endIndex) {
77 return false;
78 }
79 range[1] = region.bands[curIndex++];
80 range[3] = region.bands[curIndex++];
81 numXbands = region.bands[curIndex++];
82 return true;
83 }
84
85 /**
86 * Moves the iteration state to the beginning of the next
87 * X band in the current Y range returning true if one is
88 * found and recording the low and high X coordinates of
89 * the range in the array at locations 0 and 2 respectively.
90 */
91 public boolean nextXBand(int[] range) {
92 if (numXbands <= 0) {
93 return false;
94 }
95 numXbands--;
96 range[0] = region.bands[curIndex++];
97 range[2] = region.bands[curIndex++];
98 return true;
99 }
100 }
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