litesoft
Subversion Repository Public Repository

litesoft

URLs

Copy to Clipboard
Explore
Commits

Diff Revisions 626 vs 948 for /trunk/GWT_Sandbox/FormEngine/src/com/temp/client/foundation/pavment/AbstractPlaceTokenCodecCharacterDelta.java

Diff revisions: vs.
  @@ -1,7 +1,6 @@
1 1 package com.temp.client.foundation.pavment;
2 2
3 - import com.temp.shared.utils.CharSource;
4 - import com.temp.shared.utils.SixBitCodec;
3 + import com.temp.shared.utils.*;
5 4
6 5 /**
7 6 * Implementation that supports an encoding model of encoded Deltas from one
  @@ -16,33 +15,33 @@
16 15 *
17 16 * @return "" if null passed in, otherwise the Encoded String.
18 17 */
19 - public final String encode(String unencoded) {
20 - if ((unencoded == null) || (unencoded.length() == 0)) {
18 + public final String encode( String unencoded ) {
19 + if ( (unencoded == null) || (unencoded.length() == 0) ) {
21 20 return "";
22 21 }
23 - char initialCharacter = SixBitCodec.encode((int) (63 & System.currentTimeMillis()));
24 - return new Helper(new CharSource(unencoded), initialCharacter, determinePerCharacterAdjustment(initialCharacter)).encode();
22 + char initialCharacter = SixBitCodec.encode( (int) (63 & System.currentTimeMillis()) );
23 + return new Helper( new CharSource( unencoded ), initialCharacter, determinePerCharacterAdjustment( initialCharacter ) ).encode();
25 24 }
26 25
27 - abstract protected int determinePerCharacterAdjustment(char initialCharacter);
26 + abstract protected int determinePerCharacterAdjustment( char initialCharacter );
28 27
29 28 /**
30 29 * Decode the previously "encoded" data, null or bad encoding will return
31 30 * null.
32 31 *
33 32 * @return null indicates that the data was either null or contained
34 - * unacceptable characters for decoding.
33 + * unacceptable characters for decoding.
35 34 */
36 - public final String decode(String encoded) {
37 - if (encoded == null) {
35 + public final String decode( String encoded ) {
36 + if ( encoded == null ) {
38 37 return null;
39 38 }
40 - if (encoded.length() == 0) {
39 + if ( encoded.length() == 0 ) {
41 40 return "";
42 41 }
43 - CharSource charSource = new CharSource(encoded);
42 + CharSource charSource = new CharSource( encoded );
44 43 char initialCharacter = charSource.getRequired();
45 - return new Helper(charSource, initialCharacter, determinePerCharacterAdjustment(initialCharacter)).decode();
44 + return new Helper( charSource, initialCharacter, determinePerCharacterAdjustment( initialCharacter ) ).decode();
46 45 }
47 46
48 47 private static class Helper {
  @@ -54,24 +53,23 @@
54 53 private int deltaRunning = 0;
55 54 private int charDeltasRemaining = 0;
56 55
57 -
58 - public Helper(CharSource charSource, char firstChar, int perCharAdjustment) {
56 + public Helper( CharSource charSource, char firstChar, int perCharAdjustment ) {
59 57 this.charSource = charSource;
60 58 this.perCharAdjustment = perCharAdjustment;
61 59 this.lastClearTextChar = firstChar;
62 60 }
63 61
64 62 public String encode() {
65 - mSB.append((char) lastClearTextChar);
66 - while (charSource.anyRemaining()) {
67 - encode(charSource.get());
63 + mSB.append( (char) lastClearTextChar );
64 + while ( charSource.anyRemaining() ) {
65 + encode( charSource.get() );
68 66 }
69 67 return mSB.toString();
70 68 }
71 69
72 70 public String decode() {
73 - while (charSource.anyRemaining()) {
74 - if (!decode(charSource.get())) {
71 + while ( charSource.anyRemaining() ) {
72 + if ( !decode( charSource.get() ) ) {
75 73 return null;
76 74 }
77 75 }
  @@ -79,45 +77,45 @@
79 77 return (charDeltasRemaining == 0) ? mSB.toString() : null;
80 78 }
81 79
82 - private void encode(int chr) {
80 + private void encode( int chr ) {
83 81 int delta = (chr - lastClearTextChar) + perCharAdjustment;
84 - if (delta < 0) {
85 - LLencode(-delta, 'a');
82 + if ( delta < 0 ) {
83 + LLencode( -delta, 'a' );
86 84 } else {
87 - LLencode(delta, 'A');
85 + LLencode( delta, 'A' );
88 86 }
89 87 lastClearTextChar = chr;
90 88 }
91 89
92 - private void LLencode(int delta, int base) {
93 - if (div4 <= delta) {
94 - mSB.append('4');
95 - delta = addFactor(delta, base, div4);
96 - delta = addFactor(delta, base, div3);
97 - delta = addFactor(delta, base, div2);
98 - } else if (div3 <= delta) {
99 - mSB.append('3');
100 - delta = addFactor(delta, base, div3);
101 - delta = addFactor(delta, base, div2);
102 - } else if (div2 <= delta) {
103 - mSB.append('2');
104 - delta = addFactor(delta, base, div2);
90 + private void LLencode( int delta, int base ) {
91 + if ( div4 <= delta ) {
92 + mSB.append( '4' );
93 + delta = addFactor( delta, base, div4 );
94 + delta = addFactor( delta, base, div3 );
95 + delta = addFactor( delta, base, div2 );
96 + } else if ( div3 <= delta ) {
97 + mSB.append( '3' );
98 + delta = addFactor( delta, base, div3 );
99 + delta = addFactor( delta, base, div2 );
100 + } else if ( div2 <= delta ) {
101 + mSB.append( '2' );
102 + delta = addFactor( delta, base, div2 );
105 103 }
106 - LLencodeChar(delta, base);
104 + LLencodeChar( delta, base );
107 105 }
108 106
109 - private int addFactor(int delta, int base, int divisor) {
107 + private int addFactor( int delta, int base, int divisor ) {
110 108 int zDelta = 0;
111 - while (delta >= divisor) {
109 + while ( delta >= divisor ) {
112 110 zDelta++;
113 111 delta -= divisor;
114 112 }
115 - LLencodeChar(zDelta, base);
113 + LLencodeChar( zDelta, base );
116 114 return delta;
117 115 }
118 116
119 - private void LLencodeChar(int delta, int base) {
120 - mSB.append((delta == 0) ? '0' : (char) (base + (delta - 1)));
117 + private void LLencodeChar( int delta, int base ) {
118 + mSB.append( (delta == 0) ? '0' : (char) (base + (delta - 1)) );
121 119 }
122 120
123 121 // 0 = No Change / same letter
  @@ -128,45 +126,45 @@
128 126 private static final int div3 = 729; // 27 * 27;
129 127 private static final int div2 = 27;
130 128
131 - public boolean decode(int chr) {
132 - if (charDeltasRemaining > 0) {
133 - Integer delta = LLdecode(chr);
134 - if (delta == null) {
129 + public boolean decode( int chr ) {
130 + if ( charDeltasRemaining > 0 ) {
131 + Integer delta = LLdecode( chr );
132 + if ( delta == null ) {
135 133 return false;
136 134 }
137 135 deltaRunning = (deltaRunning * 27) + delta;
138 - if (--charDeltasRemaining == 0) {
139 - if (!LLdecodeChar(deltaRunning)) {
136 + if ( --charDeltasRemaining == 0 ) {
137 + if ( !LLdecodeChar( deltaRunning ) ) {
140 138 return false;
141 139 }
142 140 deltaRunning = 0;
143 141 }
144 142 return true;
145 143 }
146 - if (('2' <= chr) && (chr <= '4')) {
144 + if ( ('2' <= chr) && (chr <= '4') ) {
147 145 charDeltasRemaining = chr - '0';
148 146 return true;
149 147 }
150 - return LLdecodeChar(LLdecode(chr));
148 + return LLdecodeChar( LLdecode( chr ) );
151 149 }
152 150
153 - private boolean LLdecodeChar(Integer delta) {
154 - if (delta == null) {
151 + private boolean LLdecodeChar( Integer delta ) {
152 + if ( delta == null ) {
155 153 return false;
156 154 }
157 155 lastClearTextChar += delta - perCharAdjustment;
158 - mSB.append((char) lastClearTextChar);
156 + mSB.append( (char) lastClearTextChar );
159 157 return true;
160 158 }
161 159
162 - private Integer LLdecode(int chr) {
163 - if (chr == '0') {
160 + private Integer LLdecode( int chr ) {
161 + if ( chr == '0' ) {
164 162 return 0;
165 163 }
166 - if (('a' <= chr) && (chr <= 'z')) {
164 + if ( ('a' <= chr) && (chr <= 'z') ) {
167 165 return -(1 + (chr - 'a'));
168 166 }
169 - if (('A' <= chr) && (chr <= 'Z')) {
167 + if ( ('A' <= chr) && (chr <= 'Z') ) {
170 168 return (1 + (chr - 'A'));
171 169 }
172 170 return null; // Unacceptable Char

View View this file contents

History View the full history

Feeds

Commits for /trunk/GWT_Sandbox/FormEngine/src/com/temp/client/foundation/pavment/AbstractPlaceTokenCodecCharacterDelta.java

Need assistance?   Get in touch, or head to our documentation site.