org.hsqldb.ExpressionPeriod Maven / Gradle / Ivy
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/* Copyright (c) 2001-2019, The HSQL Development Group
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package org.hsqldb;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.HsqlList;
import org.hsqldb.lib.Set;
/**
* Nodes represent PERIOD start and end.
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.5.0
* @since 2.5.0
*/
public class ExpressionPeriod extends Expression {
PeriodDefinition period;
// temporary use during parsing
ExpressionColumn columnExpr;
/**
* for default SYSTEM_TIME in table reference
*/
ExpressionPeriod() {
super(OpTypes.PERIOD);
}
/**
* FOR SYSTEM_TIME FROM ... TO
*/
ExpressionPeriod(Expression start, Expression end) {
super(OpTypes.PERIOD);
this.nodes = new Expression[] {
start, end
};
}
/**
* any named period
*/
ExpressionPeriod(ExpressionColumn colExpr) {
super(OpTypes.PERIOD);
this.columnExpr = colExpr;
}
/**
* any defined period
*/
ExpressionPeriod(PeriodDefinition period) {
super(OpTypes.PERIOD);
this.period = period;
}
/**
* paranthesized period elements
*/
ExpressionPeriod(Expression rowExpr) {
super(OpTypes.PERIOD);
this.nodes = rowExpr.nodes;
}
boolean isNamedPeriod() {
return period != null;
}
int getPeriodType() {
if (period == null) {
return SchemaObject.PeriodType.PERIOD_NONE;
}
return period.getPeriodType();
}
/**
* For system period
*/
void setRangeVariable(RangeVariable rangeVar) {
Table table = rangeVar.getTable();
period = table.getSystemPeriod();
Expression left = new ExpressionColumn(rangeVar, period.startColumn);
Expression right = new ExpressionColumn(rangeVar, period.endColumn);
nodes = new Expression[] {
left, right
};
}
public HsqlList resolveColumnReferences(Session session,
RangeGroup rangeGroup, int rangeCount, RangeGroup[] rangeGroups,
HsqlList unresolvedSet, boolean acceptsSequences) {
for (int i = 0; i < nodes.length; i++) {
unresolvedSet = nodes[i].resolveColumnReferences(session,
rangeGroup, rangeCount, rangeGroups, unresolvedSet,
acceptsSequences);
}
RangeVariable[] rangeVarArray = rangeGroup.getRangeVariables();
if (columnExpr != null) {
for (int i = 0; i < rangeCount; i++) {
RangeVariable rangeVar = rangeVarArray[i];
PeriodDefinition p = rangeVar.findPeriod(columnExpr.schema,
columnExpr.tableName, columnExpr.columnName);
if (p != null) {
if (period == null) {
period = p;
Expression left =
new ExpressionColumn(rangeVar, period.startColumn);
Expression right = new ExpressionColumn(rangeVar,
period.endColumn);
nodes = new Expression[] {
left, right
};
} else {
throw Error.error(ErrorCode.X_42516);
}
}
}
if (period == null) {
throw Error.error(ErrorCode.X_42516);
}
}
return unresolvedSet;
}
public void resolveTypes(Session session, Expression parent) {
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] != null) {
nodes[i].resolveTypes(session, this);
}
}
}
void collectObjectNames(Set set) {
if (period != null) {
set.add(period.getName());
}
}
}