WhereExpressionVisitor.java 源码
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代码:
public class WhereExpressionVisitor implements ExpressionVisitor, ParserConstants {
private Object result;
private RowMeta rowInfo;
private Expression expression;
private Object[] values;
/**
* Creates a new MyExpressionVisitor object.
*
* @param rowInfo DOCUMENT ME!
*/
public WhereExpressionVisitor(RowMeta rowInfo, Expression expression) {
this.rowInfo = rowInfo;
this.expression = expression;
}
/**
* DOCUMENT ME!
*
* @param exp DOCUMENT ME!
*/
public Object eval(Object[] values) {
this.values = values;
expression.accept(this);
return result;
}
/**
* DOCUMENT ME!
*
* @param args DOCUMENT ME!
*/
/**
* DOCUMENT ME!
*
* @param nullValue DOCUMENT ME!
*/
public void visit(NullValue nullValue) {
this.result = null;
}
/**
* DOCUMENT ME!
*
* @param function DOCUMENT ME!
*/
public void visit(Function function) {
throw new UnsupportedOperationException("不支持!");
}
/**
* DOCUMENT ME!
*
* @param inverseExpression DOCUMENT ME!
*/
public void visit(InverseExpression inverseExpression) {
throw new UnsupportedOperationException("不支持!");
}
/**
* DOCUMENT ME!
*
* @param jdbcParameter DOCUMENT ME!
*/
public void visit(JdbcParameter jdbcParameter) {
throw new UnsupportedOperationException("不支持!");
}
/**
* DOCUMENT ME!
*
* @param doubleValue DOCUMENT ME!
*/
public void visit(DoubleValue doubleValue) {
result = doubleValue.getValue();
}
/**
* DOCUMENT ME!
*
* @param longValue DOCUMENT ME!
*/
public void visit(LongValue longValue) {
this.result = longValue.getValue();
}
/**
* DOCUMENT ME!
*
* @param dateValue DOCUMENT ME!
*/
public void visit(DateValue dateValue) {
result = dateValue.getValue();
}
/**
* DOCUMENT ME!
*
* @param timeValue DOCUMENT ME!
*/
public void visit(TimeValue timeValue) {
result = timeValue.getValue();
}
/**
* DOCUMENT ME!
*
* @param timestampValue DOCUMENT ME!
*/
public void visit(TimestampValue timestampValue) {
result = timestampValue.getValue();
}
/**
* DOCUMENT ME!
*
* @param parenthesis DOCUMENT ME!
*/
public void visit(Parenthesis parenthesis) {
parenthesis.getExpression().accept(this);
}
/**
* DOCUMENT ME!
*
* @param stringValue DOCUMENT ME!
*/
public void visit(StringValue stringValue) {
result = stringValue.getValue();
}
/**
* DOCUMENT ME!
*
* @param addition DOCUMENT ME!
*/
public void visit(Addition equalsTo) {
Expression left = equalsTo.getLeftExpression();
left.accept(this);
Object leftValue = result;
Expression right = equalsTo.getRightExpression();
right.accept(this);
Object rightValue = result;
result = BinaryOperation.eval(leftValue, rightValue, PLUS);
}
/**
* DOCUMENT ME!
*
* @param division DOCUMENT ME!
*/
public void visit(Division division) {
Expression left = division.getLeftExpression();
left.accept(this);
Object leftValue = result;
Expression right = division.getRightExpression();
right.accept(this);
Object rightValue = result;
result = BinaryOperation.eval(leftValue, rightValue, SLASH);
}
/**
* DOCUMENT ME!
*
* @param multiplication DOCUMENT ME!
*/
public void visit(Multiplication multiplication) {
Expression left = multiplication.getLeftExpression();
left.accept(this);
Object leftValue = result;
Expression right = multiplication.getRightExpression();
right.accept(this);
Object rightValue = result;
result = BinaryOperation.eval(leftValue, rightValue, STAR);
}
/**
* DOCUMENT ME!
*
* @param subtraction DOCUMENT ME!
*/
public void visit(Subtraction subtraction) {
Expression left = subtraction.getLeftExpression();
left.accept(this);
Object leftValue = result;
Expression right = subtraction.getRightExpression();
right.accept(this);
Object rightValue = result;
result = BinaryOperation.eval(leftValue, rightValue, MINUS);
}
/**
* DOCUMENT ME!
*
* @param andExpression DOCUMENT ME!
*/
public void visit(AndExpression andExpression) {
Expression left = andExpression.getLeftExpression();
left.accept(this);
Object leftValue = result;
Expression right = andExpression.getRightExpression();
right.accept(this);
Object rightValue = result;
result = BinaryOperation.eval(leftValue, rightValue, BOOL_AND);
}
/**
* DOCUMENT ME!
*
* @param orExpression DOCUMENT ME!
*/
public void visit(OrExpression orExpression) {
Expression left = orExpression.getLeftExpression();
left.accept(this);
Object leftValue = result;
Expression right = orExpression.getRightExpression();
right.accept(this);
Object rightValue = result;
result = BinaryOperation.eval(leftValue, rightValue, BOOL_OR);
}
/**
* DOCUMENT ME!
*
* @param between DOCUMENT ME!
*/
public void visit(Between between) {
Expression left = between.getLeftExpression();
left.accept(this);
Object leftValue = result;
Expression start = between.getBetweenExpressionStart();
start.accept(this);
Object startValue = result;
Expression end = between.getBetweenExpressionStart();
end.accept(this);
Object endValue = result;
if (!between.isNot()) {
Object ge = BinaryOperation.eval(leftValue, startValue, GE);
Object le = BinaryOperation.eval(leftValue, endValue, LE);
result = BinaryOperation.eval(ge, le, BOOL_AND);
} else {
Object ge = BinaryOperation.eval(leftValue, startValue, LT);
Object le = BinaryOperation.eval(leftValue, endValue, GT);
result = BinaryOperation.eval(ge, le, BOOL_OR);
}
}
/**
* DOCUMENT ME!
*
* @param equalsTo DOCUMENT ME!
*/
public void visit(EqualsTo equalsTo) {
Expression left = equalsTo.getLeftExpression();
left.accept(this);
Object leftValue = result;
Expression right = equalsTo.getRightExpression();
right.accept(this);
Object rightValue = result;
result = BinaryOperation.eval(leftValue, rightValue, EQ);
}
/**
* DOCUMENT ME!
*
* @param greaterThan DOCUMENT ME!
*/
public void visit(GreaterThan greaterThan) {
Expression left = greaterThan.getLeftExpression();
left.accept(this);
Object leftValue = result;
Expression right = greaterThan.getRightExpression();
right.accept(this);
Object rightValue = result;
result = BinaryOperation.eval(leftValue, rightValue, GT);
}
/**
* DOCUMENT ME!
*
* @param greaterThanEquals DOCUMENT ME!
*/
public void visit(GreaterThanEquals greaterThanEquals) {
Expression left = greaterThanEquals.getLeftExpression();
left.accept(this);
Object leftValue = result;
Expression right = greaterThanEquals.getRightExpression();
right.accept(this);
Object rightValue = result;
result = BinaryOperation.eval(leftValue, rightValue, GE);
}
/**
* DOCUMENT ME!
*
* @param inExpression DOCUMENT ME!
*/
public void visit(InExpression inExpression) {
throw new UnsupportedOperationException("不支持!");
}
/**
* DOCUMENT ME!
*
* @param isNullExpression DOCUMENT ME!
*/
public void visit(IsNullExpression isNullExpression) {
Expression left = isNullExpression.getLeftExpression();
left.accept(this);
boolean isnull = result == null;
if (isNullExpression.isNot()) {
result = !isnull;
} else {
result = isnull;
}
}
/**
* DOCUMENT ME!
*
* @param likeExpression DOCUMENT ME!
*/
public void visit(LikeExpression likeExpression) {
throw new UnsupportedOperationException("不支持!");
}
/**
* DOCUMENT ME!
*
* @param minorThan DOCUMENT ME!
*/
public void visit(MinorThan minorThan) {
Expression left = minorThan.getLeftExpression();
left.accept(this);
Object leftValue = result;
Expression right = minorThan.getRightExpression();
right.accept(this);
Object rightValue = result;
result = BinaryOperation.eval(leftValue, rightValue, LT);
}
/**
* DOCUMENT ME!
*
* @param minorThanEquals DOCUMENT ME!
*/
public void visit(MinorThanEquals minorThanEquals) {
Expression left = minorThanEquals.getLeftExpression();
left.accept(this);
Object leftValue = result;
Expression right = minorThanEquals.getRightExpression();
right.accept(this);
Object rightValue = result;
result = BinaryOperation.eval(leftValue, rightValue, LE);
}
/**
* DOCUMENT ME!
*
* @param notEqualsTo DOCUMENT ME!
*/
public void visit(NotEqualsTo notEqualsTo) {
Expression left = notEqualsTo.getLeftExpression();
left.accept(this);
Object leftValue = result;
Expression right = notEqualsTo.getRightExpression();
right.accept(this);
Object rightValue = result;
result = BinaryOperation.eval(leftValue, rightValue, NE);
}
/**
* DOCUMENT ME!
*
* @param tableColumn DOCUMENT ME!
*/
public void visit(Column tableColumn) {
int col = this.rowInfo.getIndexByColumnName(tableColumn.getColumnName());
if ((col > -1) && (col < this.values.length)) {
result = this.values[col];
} else {
result = null;
}
}
/**
* DOCUMENT ME!
*
* @param subSelect DOCUMENT ME!
*/
public void visit(SubSelect subSelect) {
throw new UnsupportedOperationException("不支持!");
}
/**
* DOCUMENT ME!
*
* @param caseExpression DOCUMENT ME!
*/
public void visit(CaseExpression caseExpression) {
throw new UnsupportedOperationException("不支持!");
}
/**
* DOCUMENT ME!
*
* @param whenClause DOCUMENT ME!
*/
public void visit(WhenClause whenClause) {
throw new UnsupportedOperationException("不支持!");
}
/**
* DOCUMENT ME!
*
* @param existsExpression DOCUMENT ME!
*/
public void visit(ExistsExpression existsExpression) {
throw new UnsupportedOperationException("不支持!");
}
/**
* DOCUMENT ME!
*
* @param allComparisonExpression DOCUMENT ME!
*/
public void visit(AllComparisonExpression allComparisonExpression) {
throw new UnsupportedOperationException("不支持!");
}
/**
* DOCUMENT ME!
*
* @param anyComparisonExpression DOCUMENT ME!
*/
public void visit(AnyComparisonExpression anyComparisonExpression) {
throw new UnsupportedOperationException("不支持!");
}
}
