/*
*
* SchemaCrawler
* http://sourceforge.net/projects/schemacrawler
* Copyright (c) 2000-2012, Sualeh Fatehi.
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
package schemacrawler.crawl;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import schemacrawler.schema.Column;
import schemacrawler.schema.Table;
import schemacrawler.schema.TableRelationshipType;
import schemacrawler.schema.Trigger;
import schemacrawler.schema.View;
import schemacrawler.schemacrawler.InclusionRule;
import schemacrawler.schemacrawler.SchemaCrawlerOptions;
class TableFilter
{
private static final Logger LOGGER = Logger.getLogger(TableFilter.class
.getName());
private final SchemaCrawlerOptions options;
private final NamedObjectList<MutableTable> allTables;
public TableFilter(final SchemaCrawlerOptions options,
final NamedObjectList<MutableTable> allTables)
{
this.options = options;
this.allTables = allTables;
}
public void filter()
{
final Collection<MutableTable> filteredTables = doFilter();
for (final MutableTable table: allTables)
{
if (!filteredTables.contains(table))
{
allTables.remove(table);
}
}
}
private Collection<MutableTable> doFilter()
{
// Filter for grep
final Set<MutableTable> greppedTables = new HashSet<MutableTable>();
for (final MutableTable table: allTables)
{
if (grepMatch(options, table))
{
greppedTables.add(table);
}
}
// Add in referenced tables
final int childTableFilterDepth = options.getChildTableFilterDepth();
final Collection<MutableTable> childTables = includeRelatedTables(TableRelationshipType.child,
childTableFilterDepth,
greppedTables);
final int parentTableFilterDepth = options.getParentTableFilterDepth();
final Collection<MutableTable> parentTables = includeRelatedTables(TableRelationshipType.parent,
parentTableFilterDepth,
greppedTables);
final Set<MutableTable> filteredTables = new HashSet<MutableTable>();
filteredTables.addAll(greppedTables);
filteredTables.addAll(childTables);
filteredTables.addAll(parentTables);
return filteredTables;
}
/**
* Special case for "grep" like functionality. Handle table if a table
* column inclusion rule is found, and at least one column matches the
* rule.
*
* @param options
* Options
* @param table
* Table to check
* @return Whether the column should be included
*/
private boolean grepMatch(final SchemaCrawlerOptions options,
final Table table)
{
final boolean invertMatch = options.isGrepInvertMatch();
final boolean checkIncludeForColumns = options.isGrepColumns();
final boolean checkIncludeForDefinitions = options.isGrepDefinitions();
final InclusionRule grepColumnInclusionRule = options
.getGrepColumnInclusionRule();
final InclusionRule grepDefinitionInclusionRule = options
.getGrepDefinitionInclusionRule();
if (!checkIncludeForColumns && !checkIncludeForDefinitions)
{
return true;
}
boolean includeForColumns = false;
boolean includeForDefinitions = false;
for (final Column column: table.getColumns())
{
if (checkIncludeForColumns)
{
if (grepColumnInclusionRule.include(column.getFullName()))
{
includeForColumns = true;
break;
}
}
if (checkIncludeForDefinitions)
{
if (grepDefinitionInclusionRule.include(column.getRemarks()))
{
includeForDefinitions = true;
break;
}
}
}
// Additional include checks for definitions
if (checkIncludeForDefinitions)
{
if (grepDefinitionInclusionRule.include(table.getRemarks()))
{
includeForDefinitions = true;
}
if (table instanceof View)
{
if (grepDefinitionInclusionRule.include(((View) table).getDefinition()))
{
includeForDefinitions = true;
}
}
for (final Trigger trigger: table.getTriggers())
{
if (grepDefinitionInclusionRule.include(trigger.getActionStatement()))
{
includeForDefinitions = true;
break;
}
}
}
boolean include = checkIncludeForColumns && includeForColumns
|| checkIncludeForDefinitions && includeForDefinitions;
if (invertMatch)
{
include = !include;
}
if (!include)
{
LOGGER.log(Level.FINE, "Removing table " + table
+ " since it does not match the grep pattern");
}
return include;
}
private Collection<MutableTable> includeRelatedTables(final TableRelationshipType tableRelationshipType,
final int depth,
final Set<MutableTable> greppedTables)
{
final Set<MutableTable> includedTables = new HashSet<MutableTable>();
includedTables.addAll(greppedTables);
for (int i = 0; i < depth; i++)
{
for (final MutableTable table: new HashSet<MutableTable>(includedTables))
{
for (final Table relatedTable: table
.getRelatedTables(tableRelationshipType))
{
includedTables.add((MutableTable) relatedTable);
}
}
}
return includedTables;
}
}