The method of java binary Multi-field matching
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Package util;/** merges multiple int positive integers into a long type for storage, and calculates whether the two groups of int match by xor operation * the value of MultiEnumVal64 int positive integers must be greater than 0 and 0 for the special calculation of MultiVal64 itself, b as an example * * String sql = ""; * if (mv643.isHasIgnoreVal ()) {* sql = "select * from table where column_name (") * for (int [] pos: mv643.getIgnorePos ()) {* if (pos [0] > 0 | | pos [1] > 0) {* for (int start = pos [1]; start b as an example * * String sql = ""; * if (mv643.isHasIgnoreVal ()) {* sql = "select * from table where (column_name & ~"; * sql + = mv643.getComparVal ()) * sql + = ") ^" + mv643.getLong () + "= 0;"; *} else {* sql = "select * from table where column_name ^" + mv643.getLong () + "= 0;"; *} * * / public class MultiEnumVal64 {/ * binary length container for the maximum value of all attributes * / private int [] config / * ignore locations that do not participate in matching values * / private int [] [] ignorePos; / * binary values * / private long longVal; / * the binary length synthesis of the maximum value of all attributes * / private int length; / * whether there is no participation in the matching identity * / private boolean hasIgnoreVal = false / * * the maximum value of each group of int * * @ param maxValConfig * / public MultiEnumVal64 (int... MaxValConfig) {this.config = new int [maxValConfig.length]; this.ignorePos = new int [maxValConfig.length] [2]; for (int index = 0; index)
< maxValConfig.length; index++) { int maxVal = maxValConfig[index]; if (maxVal < 0) { throw new IllegalArgumentException("value must be greater than 0"); } int tempLength = Integer.toBinaryString(maxVal).length(); this.config[index] = tempLength; length += tempLength; } if (length + 1 >63) {throw new IllegalArgumentException (length + "over the maximum digit 62");}} / * * value 1) {startIndex = 1; values [I] = Integer.parseInt (binary.substring (startIndex, endIndex), 2);} else {values [I] =-1 }} else {values [I] = Integer.parseInt (binary.substring (startIndex, endIndex), 2);} if (values [I] = = 0) {values [I] =-1;} endIndex = startIndex;} return values } public int [] [] getIgnorePos () {return ignorePos;} public int getLength () {return length;} public long getComparVal () {long M1 = 0L If (hasIgnoreVal) {for (int [] pos: ignorePos) {if (pos [0] > 0 | | pos [1] > 0) {for (int start = pos [1]; start)
