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// Copyright (c) 2008 Health Market Science, Inc.
package com.healthmarketscience.jackcess;
import java.util.Collections;
import java.util.List;
import java.util.ArrayList;
/**
* Information about a relationship between two tables in the database.
*
* @author James Ahlborn
*/
public class Relationship {
/** flag indicating one-to-one relationship */
private static final int ONE_TO_ONE_FLAG = 0x00000001;
/** flag indicating no referential integrity */
private static final int NO_REFERENTIAL_INTEGRITY_FLAG = 0x00000002;
/** flag indicating cascading updates (requires referential integrity) */
private static final int CASCADE_UPDATES_FLAG = 0x00000100;
/** flag indicating cascading deletes (requires referential integrity) */
private static final int CASCADE_DELETES_FLAG = 0x00001000;
/** flag indicating left outer join */
private static final int LEFT_OUTER_JOIN_FLAG = 0x01000000;
/** flag indicating right outer join */
private static final int RIGHT_OUTER_JOIN_FLAG = 0x02000000;
/** the name of this relationship */
private final String _name;
/** the "from" table in this relationship */
private final Table _fromTable;
/** the "to" table in this relationship */
private final Table _toTable;
/** the columns in the "from" table in this relationship (aligned w/
toColumns list) */
private List<Column> _toColumns;
/** the columns in the "to" table in this relationship (aligned w/
toColumns list) */
private List<Column> _fromColumns;
/** the various flags describing this relationship */
private final int _flags;
public Relationship(String name, Table fromTable, Table toTable, int flags,
int numCols)
{
_name = name;
_fromTable = fromTable;
_fromColumns = new ArrayList<Column>(
Collections.nCopies(numCols, (Column)null));
_toTable = toTable;
_toColumns = new ArrayList<Column>(
Collections.nCopies(numCols, (Column)null));
_flags = flags;
}
public String getName() {
return _name;
}
public Table getFromTable() {
return _fromTable;
}
public List<Column> getFromColumns() {
return _fromColumns;
}
public Table getToTable() {
return _toTable;
}
public List<Column> getToColumns() {
return _toColumns;
}
public int getFlags() {
return _flags;
}
public boolean isOneToOne() {
return hasFlag(ONE_TO_ONE_FLAG);
}
public boolean hasReferentialIntegrity() {
return !hasFlag(NO_REFERENTIAL_INTEGRITY_FLAG);
}
public boolean cascadeUpdates() {
return hasFlag(CASCADE_UPDATES_FLAG);
}
public boolean cascadeDeletes() {
return hasFlag(CASCADE_DELETES_FLAG);
}
public boolean isLeftOuterJoin() {
return hasFlag(LEFT_OUTER_JOIN_FLAG);
}
public boolean isRightOuterJoin() {
return hasFlag(RIGHT_OUTER_JOIN_FLAG);
}
private boolean hasFlag(int flagMask) {
return((getFlags() & flagMask) != 0);
}
@Override
public String toString() {
StringBuilder rtn = new StringBuilder();
rtn.append("\tName: " + _name);
rtn.append("\n\tFromTable: " + _fromTable.getName());
rtn.append("\n\tFromColumns: " + _fromColumns);
rtn.append("\n\tToTable: " + _toTable.getName());
rtn.append("\n\tToColumns: " + _toColumns);
rtn.append("\n\tFlags: " + Integer.toHexString(_flags));
rtn.append("\n\n");
return rtn.toString();
}
}
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