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author | James Ahlborn <jtahlborn@yahoo.com> | 2019-08-06 21:35:25 +0000 |
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committer | James Ahlborn <jtahlborn@yahoo.com> | 2019-08-06 21:35:25 +0000 |
commit | e47aa25994d1636389e334879926a9d9892adc97 (patch) | |
tree | a9ce362532061af63d5e36d4ebce604a54f7a533 /src/main/java/com | |
parent | 4de28011309dd39bf767692ce732440de5d850ca (diff) | |
download | jackcess-e47aa25994d1636389e334879926a9d9892adc97.tar.gz jackcess-e47aa25994d1636389e334879926a9d9892adc97.zip |
initial support for writing access 97 indexes
git-svn-id: https://svn.code.sf.net/p/jackcess/code/jackcess/branches/a97_indexes@1309 f203690c-595d-4dc9-a70b-905162fa7fd2
Diffstat (limited to 'src/main/java/com')
-rw-r--r-- | src/main/java/com/healthmarketscience/jackcess/impl/GeneralLegacyIndexCodes.java | 129 |
1 files changed, 107 insertions, 22 deletions
diff --git a/src/main/java/com/healthmarketscience/jackcess/impl/GeneralLegacyIndexCodes.java b/src/main/java/com/healthmarketscience/jackcess/impl/GeneralLegacyIndexCodes.java index 26b4dea..218f4d5 100644 --- a/src/main/java/com/healthmarketscience/jackcess/impl/GeneralLegacyIndexCodes.java +++ b/src/main/java/com/healthmarketscience/jackcess/impl/GeneralLegacyIndexCodes.java @@ -52,20 +52,20 @@ public class GeneralLegacyIndexCodes { // international char is replaced with ascii char. // pattern for international chars in the extra bytes: // [ 02 (for each normal char) ] [ <symbol_code> (for each inat char) ] - static final byte INTERNATIONAL_EXTRA_PLACEHOLDER = (byte)0x02; + static final byte INTERNATIONAL_EXTRA_PLACEHOLDER = (byte)0x02; // see Index.writeCrazyCodes for details on writing crazy codes static final byte CRAZY_CODE_START = (byte)0x80; static final byte CRAZY_CODE_1 = (byte)0x02; static final byte CRAZY_CODE_2 = (byte)0x03; - static final byte[] CRAZY_CODES_SUFFIX = + static final byte[] CRAZY_CODES_SUFFIX = new byte[]{(byte)0xFF, (byte)0x02, (byte)0x80, (byte)0xFF, (byte)0x80}; static final byte CRAZY_CODES_UNPRINT_SUFFIX = (byte)0xFF; // stash the codes in some resource files - private static final String CODES_FILE = + private static final String CODES_FILE = DatabaseImpl.RESOURCE_PATH + "index_codes_genleg.txt"; - private static final String EXT_CODES_FILE = + private static final String EXT_CODES_FILE = DatabaseImpl.RESOURCE_PATH + "index_codes_ext_genleg.txt"; /** @@ -267,7 +267,7 @@ public class GeneralLegacyIndexCodes { private static final CharHandler[] _values = loadCodes( CODES_FILE, FIRST_CHAR, LAST_CHAR); } - + private static final class ExtCodes { /** handlers for the rest of the chars in BMP 0. use nested class to @@ -276,9 +276,9 @@ public class GeneralLegacyIndexCodes { EXT_CODES_FILE, FIRST_EXT_CHAR, LAST_EXT_CHAR); } - static final GeneralLegacyIndexCodes GEN_LEG_INSTANCE = + static final GeneralLegacyIndexCodes GEN_LEG_INSTANCE = new GeneralLegacyIndexCodes(); - + GeneralLegacyIndexCodes() { } @@ -316,7 +316,7 @@ public class GeneralLegacyIndexCodes { reader = new BufferedReader( new InputStreamReader( DatabaseImpl.getResourceAsStream(codesFilePath), "US-ASCII")); - + int start = asUnsignedChar(firstChar); int end = asUnsignedChar(lastChar); for(int i = start; i <= end; ++i) { @@ -357,7 +357,7 @@ public class GeneralLegacyIndexCodes { /** * Returns a SimpleCharHandler parsed from the given index code strings. */ - private static CharHandler parseSimpleCodes(String[] codeStrings) + private static CharHandler parseSimpleCodes(String[] codeStrings) { if(codeStrings.length != 1) { throw new IllegalStateException("Unexpected code strings " + @@ -397,7 +397,7 @@ public class GeneralLegacyIndexCodes { * Returns a UnprintableExtCharHandler parsed from the given index code * strings. */ - private static CharHandler parseUnprintableExtCodes(String[] codeStrings) + private static CharHandler parseUnprintableExtCodes(String[] codeStrings) { if(codeStrings.length != 1) { throw new IllegalStateException("Unexpected code strings " + @@ -415,7 +415,7 @@ public class GeneralLegacyIndexCodes { * Returns a InternationalExtCharHandler parsed from the given index code * strings. */ - private static CharHandler parseInternationalExtCodes(String[] codeStrings) + private static CharHandler parseInternationalExtCodes(String[] codeStrings) { if(codeStrings.length != 3) { throw new IllegalStateException("Unexpected code strings " + @@ -484,7 +484,7 @@ public class GeneralLegacyIndexCodes { // record pprevious entry length so we can do any post-processing // necessary for this entry (handling descending) int prevLength = bout.getLength(); - + // now, convert each character to a "code" of one or more bytes ExtraCodesStream extraCodes = null; ByteStream unprintableCodes = null; @@ -526,12 +526,12 @@ public class GeneralLegacyIndexCodes { if(unprintableCodes == null) { unprintableCodes = new ByteStream(); } - + // keep track of the unprintable codes for later writeUnprintableCodes(curCharOffset, bytes, unprintableCodes, extraCodes); } - + byte crazyFlag = ch.getCrazyFlag(); if(crazyFlag != 0) { if(crazyCodes == null) { @@ -580,7 +580,7 @@ public class GeneralLegacyIndexCodes { // write another end flag bout.write(END_TEXT); - + unprintableCodes.writeTo(bout); } } @@ -592,14 +592,99 @@ public class GeneralLegacyIndexCodes { // we actually write the end byte before flipping the bytes, and write // another one after flipping bout.write(END_EXTRA_TEXT); - + // flip the bytes that we have written thus far for this text value - IndexData.flipBytes(bout.getBytes(), prevLength, + IndexData.flipBytes(bout.getBytes(), prevLength, (bout.getLength() - prevLength)); } // write end extra text - bout.write(END_EXTRA_TEXT); + bout.write(END_EXTRA_TEXT); + } + + /** + * Converts a 97 index value for a text column into the entry value (which + * is based on a variety of nifty codes). + */ + void writeNonNull97IndexTextValue( + Object value, ByteStream bout, boolean isAscending) + throws IOException + { + // NOTE, this should probably be in Gen97TextColumnDescriptor but it was + // easier to add here than make everything private non-private. + + // first, convert to string + String str = ColumnImpl.toCharSequence(value).toString(); + + // all text columns (including memos) are only indexed up to the max + // number of chars in a VARCHAR column + if(str.length() > MAX_TEXT_INDEX_CHAR_LENGTH) { + str = str.substring(0, MAX_TEXT_INDEX_CHAR_LENGTH); + } + + // record pprevious entry length so we can do any post-processing + // necessary for this entry (handling descending) + int prevLength = bout.getLength(); + + // now, convert each character to a "code" of one or more bytes + ExtraCodesStream extraCodes = null; + int charOffset = 0; + for(int i = 0; i < str.length(); ++i) { + + char c = str.charAt(i); + CharHandler ch = getCharHandler(c); + + int curCharOffset = charOffset; + byte[] bytes = ch.getInlineBytes(); + if(bytes != null) { + // write the "inline" codes immediately + bout.write(bytes); + + // only increment the charOffset for chars with inline codes + ++charOffset; + } + + if(ch.getType() == Type.SIMPLE) { + // common case, skip further code handling + continue; + } + + bytes = ch.getExtraBytes(); + byte extraCodeModifier = ch.getExtraByteModifier(); + if((bytes != null) || (extraCodeModifier != 0)) { + if(extraCodes == null) { + extraCodes = new ExtraCodesStream(str.length()); + } + + // keep track of the extra codes for later + writeExtraCodes(curCharOffset, bytes, extraCodeModifier, extraCodes); + } + } + + // FIXME, how to handle extra codes for non ascending? + boolean hasExtraCodes = trimExtraCodes( + extraCodes, (byte)0, INTERNATIONAL_EXTRA_PLACEHOLDER); + if(hasExtraCodes) { + + extraCodes.writeTo(bout); + + } else { + + // handle descending order by inverting the bytes + if(!isAscending) { + + // we actually write the end byte before flipping the bytes, and write + // another one after flipping + bout.write(END_EXTRA_TEXT); + + // flip the bytes that we have written thus far for this text value + IndexData.flipBytes(bout.getBytes(), prevLength, + (bout.getLength() - prevLength)); + } + + // write end extra text + bout.write(END_EXTRA_TEXT); + } } /** @@ -619,7 +704,7 @@ public class GeneralLegacyIndexCodes { } if(bytes != null) { - + // write the actual extra codes and update the number of chars extraCodes.write(bytes); extraCodes.incrementNumChars(1); @@ -696,7 +781,7 @@ public class GeneralLegacyIndexCodes { // write offset as big-endian short unprintableCodes.write((offset >> 8) & 0xFF); unprintableCodes.write(offset & 0xFF); - + unprintableCodes.write(UNPRINTABLE_MIDFIX); unprintableCodes.write(bytes); } @@ -748,7 +833,7 @@ public class GeneralLegacyIndexCodes { private static final class ExtraCodesStream extends ByteStream { private int _numChars; - private int _unprintablePrefixLen; + private int _unprintablePrefixLen; private ExtraCodesStream(int length) { super(length); @@ -757,7 +842,7 @@ public class GeneralLegacyIndexCodes { public int getNumChars() { return _numChars; } - + public void incrementNumChars(int inc) { _numChars += inc; } |