Source Code Cross Referenced for PaletteRecord.java in  » Collaboration » poi-3.0.2-beta2 » org » apache » poi » hssf » record » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Collaboration » poi 3.0.2 beta2 » org.apache.poi.hssf.record 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* ====================================================================
002:         Licensed to the Apache Software Foundation (ASF) under one or more
003:         contributor license agreements.  See the NOTICE file distributed with
004:         this work for additional information regarding copyright ownership.
005:         The ASF licenses this file to You under the Apache License, Version 2.0
006:         (the "License"); you may not use this file except in compliance with
007:         the License.  You may obtain a copy of the License at
008:
009:         http://www.apache.org/licenses/LICENSE-2.0
010:
011:         Unless required by applicable law or agreed to in writing, software
012:         distributed under the License is distributed on an "AS IS" BASIS,
013:         WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         See the License for the specific language governing permissions and
015:         limitations under the License.
016:         ==================================================================== */
017:
018:        package org.apache.poi.hssf.record;
019:
020:        import java.util.ArrayList;
021:        import java.util.List;
022:
023:        import org.apache.poi.util.LittleEndian;
024:
025:        /**
026:         * PaletteRecord - Supports custom palettes.
027:         * @author Andrew C. Oliver (acoliver at apache dot org)
028:         * @author Brian Sanders (bsanders at risklabs dot com) - custom palette editing
029:         * @version 2.0-pre
030:         */
031:
032:        public class PaletteRecord extends Record {
033:            public final static short sid = 0x92;
034:            /** The standard size of an XLS palette */
035:            public final static byte STANDARD_PALETTE_SIZE = (byte) 56;
036:            /** The byte index of the first color */
037:            public final static short FIRST_COLOR_INDEX = (short) 0x8;
038:
039:            private short field_1_numcolors;
040:            private List field_2_colors;
041:
042:            public PaletteRecord() {
043:                createDefaultPalette();
044:            }
045:
046:            /**
047:             * Constructs a PaletteRecord record and sets its fields appropriately.
048:             * @param in the RecordInputstream to read the record from
049:             */
050:
051:            public PaletteRecord(RecordInputStream in) {
052:                super (in);
053:            }
054:
055:            protected void validateSid(short id) {
056:                if (id != sid) {
057:                    throw new RecordFormatException("NOT An Palette RECORD");
058:                }
059:            }
060:
061:            protected void fillFields(RecordInputStream in) {
062:                field_1_numcolors = in.readShort();
063:                field_2_colors = new ArrayList(field_1_numcolors);
064:                for (int k = 0; k < field_1_numcolors; k++) {
065:                    field_2_colors.add(new PColor(in.readByte(), in.readByte(),
066:                            in.readByte()));
067:                    //Read unused byte.
068:                    in.readByte();
069:                }
070:            }
071:
072:            public String toString() {
073:                StringBuffer buffer = new StringBuffer();
074:
075:                buffer.append("[PALETTE]\n");
076:                buffer.append("  numcolors     = ").append(field_1_numcolors)
077:                        .append('\n');
078:                for (int k = 0; k < field_1_numcolors; k++) {
079:                    PColor c = (PColor) field_2_colors.get(k);
080:                    buffer.append("* colornum      = ").append(k).append('\n');
081:                    buffer.append(c.toString());
082:                    buffer.append("/*colornum      = ").append(k).append('\n');
083:                }
084:                buffer.append("[/PALETTE]\n");
085:                return buffer.toString();
086:            }
087:
088:            public int serialize(int offset, byte[] data) {
089:                LittleEndian.putShort(data, 0 + offset, sid);
090:                LittleEndian.putShort(data, 2 + offset,
091:                        (short) (getRecordSize() - 4));
092:                LittleEndian.putShort(data, 4 + offset, field_1_numcolors);
093:                for (int k = 0; k < field_1_numcolors; k++) {
094:                    PColor c = (PColor) field_2_colors.get(k);
095:                    c.serialize(data, (6 + offset + (k * 4)));
096:                }
097:
098:                return getRecordSize();
099:            }
100:
101:            public int getRecordSize() {
102:                return 4 + 2 + (field_1_numcolors * 4);
103:            }
104:
105:            public short getSid() {
106:                return sid;
107:            }
108:
109:            /**
110:             * Returns the color value at a given index
111:             *
112:             * @return the RGB triplet for the color, or null if the specified index
113:             * does not exist
114:             */
115:            public byte[] getColor(short byteIndex) {
116:                int i = byteIndex - FIRST_COLOR_INDEX;
117:                if (i < 0 || i >= field_2_colors.size()) {
118:                    return null;
119:                }
120:                PColor color = (PColor) field_2_colors.get(i);
121:                return new byte[] { color.red, color.green, color.blue };
122:            }
123:
124:            /**
125:             * Sets the color value at a given index
126:             *
127:             * If the given index is greater than the current last color index,
128:             * then black is inserted at every index required to make the palette continuous.
129:             *
130:             * @param byteIndex the index to set; if this index is less than 0x8 or greater than
131:             * 0x40, then no modification is made
132:             */
133:            public void setColor(short byteIndex, byte red, byte green,
134:                    byte blue) {
135:                int i = byteIndex - FIRST_COLOR_INDEX;
136:                if (i < 0 || i >= STANDARD_PALETTE_SIZE) {
137:                    return;
138:                }
139:                while (field_2_colors.size() <= i) {
140:                    field_2_colors
141:                            .add(new PColor((byte) 0, (byte) 0, (byte) 0));
142:                }
143:                PColor custColor = new PColor(red, green, blue);
144:                field_2_colors.set(i, custColor);
145:            }
146:
147:            /**
148:             * Creates the default palette as PaletteRecord binary data
149:             *
150:             * @see org.apache.poi.hssf.model.Workbook#createPalette
151:             */
152:            private void createDefaultPalette() {
153:                field_1_numcolors = STANDARD_PALETTE_SIZE;
154:                field_2_colors = new ArrayList(field_1_numcolors);
155:                byte[] palette = new byte[] {
156:                        (byte) 0,
157:                        (byte) 0,
158:                        (byte) 0,
159:                        (byte) 0, //color 0...
160:                        (byte) 255, (byte) 255, (byte) 255, (byte) 0,
161:                        (byte) 255, (byte) 0, (byte) 0, (byte) 0, (byte) 0,
162:                        (byte) 255, (byte) 0, (byte) 0, (byte) 0, (byte) 0,
163:                        (byte) 255, (byte) 0, (byte) 255, (byte) 255, (byte) 0,
164:                        (byte) 0, (byte) 255, (byte) 0, (byte) 255, (byte) 0,
165:                        (byte) 0, (byte) 255, (byte) 255, (byte) 0, (byte) 128,
166:                        (byte) 0, (byte) 0, (byte) 0, (byte) 0, (byte) 128,
167:                        (byte) 0, (byte) 0, (byte) 0, (byte) 0, (byte) 128,
168:                        (byte) 0, (byte) 128, (byte) 128, (byte) 0, (byte) 0,
169:                        (byte) 128, (byte) 0, (byte) 128, (byte) 0, (byte) 0,
170:                        (byte) 128, (byte) 128, (byte) 0, (byte) 192,
171:                        (byte) 192, (byte) 192, (byte) 0, (byte) 128,
172:                        (byte) 128, (byte) 128, (byte) 0, (byte) 153,
173:                        (byte) 153, (byte) 255, (byte) 0, (byte) 153,
174:                        (byte) 51, (byte) 102, (byte) 0, (byte) 255,
175:                        (byte) 255, (byte) 204, (byte) 0, (byte) 204,
176:                        (byte) 255, (byte) 255, (byte) 0, (byte) 102, (byte) 0,
177:                        (byte) 102, (byte) 0, (byte) 255, (byte) 128,
178:                        (byte) 128, (byte) 0, (byte) 0, (byte) 102, (byte) 204,
179:                        (byte) 0, (byte) 204, (byte) 204, (byte) 255, (byte) 0,
180:                        (byte) 0, (byte) 0, (byte) 128, (byte) 0, (byte) 255,
181:                        (byte) 0, (byte) 255, (byte) 0, (byte) 255, (byte) 255,
182:                        (byte) 0, (byte) 0, (byte) 0, (byte) 255, (byte) 255,
183:                        (byte) 0, (byte) 128, (byte) 0, (byte) 128, (byte) 0,
184:                        (byte) 128, (byte) 0, (byte) 0, (byte) 0, (byte) 0,
185:                        (byte) 128, (byte) 128, (byte) 0, (byte) 0, (byte) 0,
186:                        (byte) 255, (byte) 0, (byte) 0, (byte) 204, (byte) 255,
187:                        (byte) 0, (byte) 204, (byte) 255, (byte) 255, (byte) 0,
188:                        (byte) 204, (byte) 255, (byte) 204, (byte) 0,
189:                        (byte) 255, (byte) 255, (byte) 153, (byte) 0,
190:                        (byte) 153, (byte) 204, (byte) 255, (byte) 0,
191:                        (byte) 255, (byte) 153, (byte) 204, (byte) 0,
192:                        (byte) 204, (byte) 153, (byte) 255, (byte) 0,
193:                        (byte) 255, (byte) 204, (byte) 153, (byte) 0,
194:                        (byte) 51, (byte) 102, (byte) 255, (byte) 0, (byte) 51,
195:                        (byte) 204, (byte) 204, (byte) 0, (byte) 153,
196:                        (byte) 204, (byte) 0, (byte) 0, (byte) 255, (byte) 204,
197:                        (byte) 0, (byte) 0, (byte) 255, (byte) 153, (byte) 0,
198:                        (byte) 0, (byte) 255, (byte) 102, (byte) 0, (byte) 0,
199:                        (byte) 102, (byte) 102, (byte) 153, (byte) 0,
200:                        (byte) 150, (byte) 150, (byte) 150, (byte) 0, (byte) 0,
201:                        (byte) 51, (byte) 102, (byte) 0, (byte) 51, (byte) 153,
202:                        (byte) 102, (byte) 0, (byte) 0, (byte) 51, (byte) 0,
203:                        (byte) 0, (byte) 51, (byte) 51, (byte) 0, (byte) 0,
204:                        (byte) 153, (byte) 51, (byte) 0, (byte) 0, (byte) 153,
205:                        (byte) 51, (byte) 102, (byte) 0, (byte) 51, (byte) 51,
206:                        (byte) 153, (byte) 0, (byte) 51, (byte) 51, (byte) 51,
207:                        (byte) 0 };
208:
209:                for (int k = 0; k < field_1_numcolors; k++) {
210:                    field_2_colors.add(new PColor(palette[k * 4],
211:                            palette[k * 4 + 1], palette[k * 4 + 2]));
212:                }
213:
214:            }
215:        }
216:
217:        /**
218:         * PColor - element in the list of colors - consider it a "struct"
219:         */
220:        class PColor {
221:            public byte red;
222:            public byte green;
223:            public byte blue;
224:
225:            public PColor(byte red, byte green, byte blue) {
226:                this .red = red;
227:                this .green = green;
228:                this .blue = blue;
229:            }
230:
231:            public void serialize(byte[] data, int offset) {
232:                data[offset + 0] = red;
233:                data[offset + 1] = green;
234:                data[offset + 2] = blue;
235:                data[offset + 3] = 0;
236:            }
237:
238:            public String toString() {
239:                StringBuffer buffer = new StringBuffer();
240:                buffer.append("  red           = ").append(red & 0xff).append(
241:                        '\n');
242:                buffer.append("  green         = ").append(green & 0xff)
243:                        .append('\n');
244:                buffer.append("  blue          = ").append(blue & 0xff).append(
245:                        '\n');
246:                return buffer.toString();
247:            }
248:        }
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