/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hp.hpl.jena.sdb.core.sqlnode;
import com.hp.hpl.jena.sparql.core.Var;
import com.hp.hpl.jena.sdb.core.Scope;
import com.hp.hpl.jena.sdb.core.ScopeBase;
import com.hp.hpl.jena.sdb.core.sqlexpr.SqlColumn;
/** Root of all tables (roughly, a group of columns) */
public class SqlTable extends SqlNodeBase0
{
private String tableName ;
protected ScopeBase idScope = null ;
protected ScopeBase nodeScope = null ;
public SqlTable(String name)
{
this(name, name) ;
}
public SqlTable(String aliasName, String tableName)
{
this(aliasName, tableName, new ScopeBase(), new ScopeBase()) ;
}
private SqlTable(String aliasName, String tableName, ScopeBase idScope, ScopeBase nodeScope)
{
super(aliasName) ;
this.tableName = tableName ;
this.idScope = idScope ;
this.nodeScope = nodeScope ;
}
@Override
public boolean isTable() { return true ; }
@Override
public SqlTable asTable() { return this ; }
@Override
public boolean usesColumn(SqlColumn c) { return c.getTable() == this ; }
public String getTableName() { return tableName ; }
@Override
public void visit(SqlNodeVisitor visitor)
{ visitor.visit(this) ; }
@Override
public Scope getIdScope() { return idScope ; }
@Override
public Scope getNodeScope() { return nodeScope ; }
public void setIdColumnForVar(Var var, SqlColumn thisCol)
{
idScope.setColumnForVar(var, thisCol) ;
}
public void setValueColumnForVar(Var var, SqlColumn thisCol)
{
if ( nodeScope == null )
nodeScope = new ScopeBase() ;
nodeScope.setColumnForVar(var, thisCol) ;
}
@Override
public int hashCode()
{
int h = 981 ;
if ( tableName != null )
h = h ^ tableName.hashCode() ;
if ( getAliasName() != null )
h = h ^ getAliasName().hashCode() << 1 ;
return h ;
}
@Override
public boolean equals(Object other)
{
if ( this == other ) return true ;
if ( ! ( other instanceof SqlTable ) )
return false ;
SqlTable table = (SqlTable)other ;
if ( ! tableName.equals(table.tableName) )
return false ;
if ( getAliasName() == null && table.getAliasName() == null )
return true ;
if ( getAliasName() == null || table.getAliasName() == null )
return false ;
return getAliasName().equals(table.getAliasName()) ;
}
@Override
public SqlNode apply(SqlTransform transform)
{
return transform.transform(this) ;
}
@Override
public SqlNode copy()
{
return new SqlTable(tableName, getAliasName(), this.idScope, this.nodeScope) ;
}
}