basetable.java

开源的axion的数据库代码

/*
 * $Id: BaseTable.java,v 1.35 2003/07/08 06:55:39 rwald Exp $
 * =======================================================================
 * Copyright (c) 2002-2003 Axion Development Team.  All rights reserved.
 *  
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met:
 * 
 * 1. Redistributions of source code must retain the above 
 *    copyright notice, this list of conditions and the following 
 *    disclaimer. 
 *   
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in 
 *    the documentation and/or other materials provided with the 
 *    distribution. 
 *   
 * 3. The names "Tigris", "Axion", nor the names of its contributors may 
 *    not be used to endorse or promote products derived from this 
 *    software without specific prior written permission. 
 *  
 * 4. Products derived from this software may not be called "Axion", nor 
 *    may "Tigris" or "Axion" appear in their names without specific prior
 *    written permission.
 *   
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * =======================================================================
 */

package org.axiondb.engine;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.collections.IteratorUtils;
import org.apache.commons.collections.primitives.ArrayIntList;
import org.apache.commons.collections.primitives.IntList;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.axiondb.AxionException;
import org.axiondb.BinaryBranchWhereNode;
import org.axiondb.BindVariable;
import org.axiondb.Column;
import org.axiondb.ColumnIdentifier;
import org.axiondb.ComparisonOperator;
import org.axiondb.Constraint;
import org.axiondb.ConstraintViolationException;
import org.axiondb.Index;
import org.axiondb.LeafWhereNode;
import org.axiondb.Literal;
import org.axiondb.Row;
import org.axiondb.RowDecorator;
import org.axiondb.RowIterator;
import org.axiondb.Selectable;
import org.axiondb.Table;
import org.axiondb.TableIdentifier;
import org.axiondb.TransactableTable;
import org.axiondb.WhereNode;
import org.axiondb.constraints.PrimaryKeyConstraint;
import org.axiondb.engine.rowiterators.FilteringRowIterator;
import org.axiondb.engine.rowiterators.RebindableIndexedRowIterator;
import org.axiondb.engine.rowiterators.UnmodifiableRowIterator;
import org.axiondb.event.BaseTableModificationPublisher;
import org.axiondb.event.ColumnEvent;
import org.axiondb.event.ConstraintEvent;
import org.axiondb.event.RowDeletedEvent;
import org.axiondb.event.RowEvent;
import org.axiondb.event.RowInsertedEvent;
import org.axiondb.event.RowUpdatedEvent;
import org.axiondb.event.TableModificationListener;
import org.axiondb.types.LOBType;

/**
 * An abstract base implementation of {@link Table}.
 *
 * @version $Revision: 1.35 $ $Date: 2003/07/08 06:55:39 $
 * @author Chuck Burdick
 * @author Rodney Waldhoff
 */
public abstract class BaseTable extends BaseTableModificationPublisher implements Table {
    protected abstract RowIterator getRowIterator() throws AxionException;
    
    public BaseTable(String name) {
        _name = name == null ? null : name.toUpperCase();
        setType(REGULAR_TABLE_TYPE);
    }

    public RowIterator getRowIterator(boolean readOnly) throws AxionException {
        if(readOnly) {
            return UnmodifiableRowIterator.wrap(getRowIterator());
        } else {
            return getRowIterator();
        }
    }

    public void addRow(Row row) throws AxionException {
        int rowid = getNextRowId();
        row.setIdentifier(rowid);
        RowInsertedEvent event = new RowInsertedEvent(this,null,row);
        try {
            checkConstraints(event);
        } catch(AxionException e) {
            freeRowId(rowid);
            throw e;
        }        
        applyInserts(IteratorUtils.singletonIterator(row));
        publishEvent(event);
    }

    protected void deleteRow(Row row) throws AxionException {
        RowDeletedEvent event = new RowDeletedEvent(this,row,null);
        checkConstraints(event);
        // TODO: create singletonIntIterator(int) method in commons-collections
        IntList list = new ArrayIntList(1);
        list.add(row.getIdentifier());        
        applyDeletes(list.iterator());
        publishEvent(event);
    }

    protected void updateRow(Row oldrow, Row newrow) throws AxionException {
        newrow.setIdentifier(oldrow.getIdentifier());
        RowUpdatedEvent event = new RowUpdatedEvent(this,oldrow,newrow);
        checkConstraints(event);
        applyUpdates(IteratorUtils.singletonIterator(newrow));
        publishEvent(event);
    }

    public String toString() {
        return getName();
    }

    public String getName() {
        return _name;
    }

    public String getType() {
        return _type;
    }

    protected void setType(String type) {
        _type = type;
    }

    public void addConstraint(Constraint constraint) throws AxionException {
        if(constraint instanceof PrimaryKeyConstraint && null != getPrimaryKey()) {
            throw new AxionException("This table already has a primary key");
        } else if(_constraints.containsKey(constraint.getName())) {
            throw new AxionException("A constraint named " + constraint.getName() + " already exists.");
        } else {
            _constraints.put(constraint.getName(),constraint);
            Iterator iter = getTableModificationListeners();
            while(iter.hasNext()) {
                TableModificationListener listener = (TableModificationListener)(iter.next());
                listener.constraintAdded(new ConstraintEvent(this, constraint));
            }
        }        
    }
    
    public void removeConstraint(String name) {
        if(name != null) {
            name = name.toUpperCase();
        }
        if (_constraints.containsKey(name)) {
            Constraint constraint = (Constraint)_constraints.get(name);
            Iterator iter = getTableModificationListeners();
            while(iter.hasNext()) {
                TableModificationListener listener = (TableModificationListener)(iter.next());
                try {
                    listener.constraintRemoved(new ConstraintEvent(this, constraint));
                } catch (AxionException e) {
                    _log.error("Unable to publish constraint removed event", e);
                }
            }
            _constraints.remove(name);
        }
    }
    
    private PrimaryKeyConstraint getPrimaryKey() {
        for(Iterator iter = _constraints.values().iterator(); iter.hasNext();) {
            Constraint constraint = (Constraint)(iter.next());
            if(constraint instanceof PrimaryKeyConstraint) {
                return (PrimaryKeyConstraint)(constraint);
            }
        }
        return null;
    }
    
    public Iterator getConstraints() {
        return _constraints.values().iterator();
    }

    public void addIndex(Index index) throws AxionException {
        if(_log.isDebugEnabled()) { _log.debug("Adding index " + index.getName()); }
        _indices.add(index);
        addTableModificationListener(index);
        if(_log.isDebugEnabled()) { _log.debug("Done adding index"); }
    }

    public void removeIndex(Index index) throws AxionException {
        if(_log.isDebugEnabled()) { _log.debug("Removing index " + index.getName()); }
        _indices.remove(index);
        this.removeTableModificationListener(index);
        if(_log.isDebugEnabled()) { _log.debug("Done removing index"); }
    }

    public Index getIndexForColumn(Column column) {
        Iterator indices = _indices.iterator();

        while(indices.hasNext()) {
            Index index = (Index)indices.next();

            if(column.equals(index.getIndexedColumn())) {
                return index;
            }
        }

        return null;
    }