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@@ -1,75 +1,74 @@ |
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package com.temp.shared.utils; |
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/** |
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* Convert Integer value to/from a very tight string representation |
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*/ |
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public class IntegerCodec { |
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public static String encodePositive(int pValue) { |
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if (pValue < 0) { |
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throw new IllegalArgumentException("Negative values not supported: " + pValue); |
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public static String encodePositive( int pValue ) { |
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if ( pValue < 0 ) { |
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throw new IllegalArgumentException( "Negative values not supported: " + pValue ); |
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} |
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if (pValue < 32) { |
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return Character.toString(SixBitCodec.encode(pValue)); |
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if ( pValue < 32 ) { |
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return Character.toString( SixBitCodec.encode( pValue ) ); |
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} |
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return new Encoder(pValue).encode(0, 32); |
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return new Encoder( pValue ).encode( 0, 32 ); |
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} |
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public static int decodePositive(String pValue) { |
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return decodePositive(new CharSource(pValue)); |
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public static int decodePositive( String pValue ) { |
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return decodePositive( new CharSource( pValue ) ); |
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} |
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public static int decodePositive(CharSource pValue) { |
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return toInt(new Decoder(pValue).decode(0, 32)); |
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public static int decodePositive( CharSource pValue ) { |
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return toInt( new Decoder( pValue ).decode( 0, 32 ) ); |
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} |
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public static String encodeSigned(int pValue) { |
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if (0 <= pValue) { |
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if (pValue < 16) { |
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return Character.toString(SixBitCodec.encode(pValue)); |
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public static String encodeSigned( int pValue ) { |
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if ( 0 <= pValue ) { |
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if ( pValue < 16 ) { |
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return Character.toString( SixBitCodec.encode( pValue ) ); |
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} |
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return new Encoder(pValue).encode(0, 16); |
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return new Encoder( pValue ).encode( 0, 16 ); |
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} |
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return new Encoder(Math.abs((long) pValue)).encode(16, 16); |
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return new Encoder( Math.abs( (long) pValue ) ).encode( 16, 16 ); |
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} |
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public static int decodeSigned(String pValue) { |
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return decodeSigned(new CharSource(pValue)); |
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public static int decodeSigned( String pValue ) { |
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return decodeSigned( new CharSource( pValue ) ); |
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} |
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public static int decodeSigned(CharSource pValue) { |
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return toInt(new Decoder(pValue).decode(16, 16)); |
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public static int decodeSigned( CharSource pValue ) { |
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return toInt( new Decoder( pValue ).decode( 16, 16 ) ); |
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} |
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private static int toInt(long pValue) { |
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if ((Integer.MIN_VALUE <= pValue) && (pValue <= Integer.MAX_VALUE)) { |
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private static int toInt( long pValue ) { |
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if ( (Integer.MIN_VALUE <= pValue) && (pValue <= Integer.MAX_VALUE) ) { |
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return (int) pValue; |
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} |
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throw new IllegalArgumentException("Resulting value (" + pValue + ") is outside the acceptable Integer Range"); |
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throw new IllegalArgumentException( "Resulting value (" + pValue + ") is outside the acceptable Integer Range" ); |
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} |
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private static class Encoder { |
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private long mValue; |
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Encoder(long pValue) { |
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Encoder( long pValue ) { |
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mValue = pValue; |
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} |
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public String encode(int pNegativeBit, int pFirstCharLimit) { |
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public String encode( int pNegativeBit, int pFirstCharLimit ) { |
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StringBuilder sb = new StringBuilder(); |
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int bits = extractBits(pFirstCharLimit - 1, pFirstCharLimit); |
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sb.append(SixBitCodec.encode(bits | pNegativeBit)); |
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while ((bits & 32) != 0) { |
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bits = extractBits(31, 32); |
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sb.append(SixBitCodec.encode(bits)); |
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int bits = extractBits( pFirstCharLimit - 1, pFirstCharLimit ); |
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sb.append( SixBitCodec.encode( bits | pNegativeBit ) ); |
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while ( (bits & 32) != 0 ) { |
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bits = extractBits( 31, 32 ); |
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sb.append( SixBitCodec.encode( bits ) ); |
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} |
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return sb.toString(); |
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} |
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private int extractBits(int pBits, int pDivisor) { |
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private int extractBits( int pBits, int pDivisor ) { |
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int rv = (int) (mValue & pBits); |
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if ((mValue /= pDivisor) > 0) { |
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if ( (mValue /= pDivisor) > 0 ) { |
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rv |= 32; |
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} |
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return rv; |
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@@ -79,19 +78,19 @@ |
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private static class Decoder { |
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private CharSource mValue; |
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Decoder(CharSource pValue) { |
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Decoder( CharSource pValue ) { |
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mValue = pValue; |
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} |
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public long decode(int pNegativeBit, long pMultiplier) { |
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int bits = SixBitCodec.decode(mValue.getRequired()); |
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public long decode( int pNegativeBit, long pMultiplier ) { |
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int bits = SixBitCodec.decode( mValue.getRequired() ); |
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boolean negative = ((bits & pNegativeBit) != 0); |
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if (negative) { |
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if ( negative ) { |
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bits -= pNegativeBit; |
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} |
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long result = (bits & 31); |
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while ((bits & 32) != 0) { |
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bits = SixBitCodec.decode(mValue.getRequired()); |
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while ( (bits & 32) != 0 ) { |
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bits = SixBitCodec.decode( mValue.getRequired() ); |
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result += (bits & 31) * pMultiplier; |
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pMultiplier *= 32; |
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} |
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