index.java

一个简单的数据库

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package indexManager;
import catalogManager.*;
import java.io.Serializable;
import java.util.ArrayList;
/**
 *
 * @author outlaw
 */
public class Index implements Serializable{
    BpTree bt=null;
    Seq seq=null;
    boolean chooseBP;
    boolean dirty;
    String path;
    String fullName;
    String tbName;
    String indName;
    
    public Index(String tbName,String path,String indName,String attribName){
        this.chooseBP=CatalogManager.useBP;
        this.path=path+tbName+"_index/";
        this.tbName=tbName;
        this.indName=indName;
        this.fullName=path+tbName+"_index/"+indName+".ind";
        if(chooseBP)
        {
            bt=new BpTree(IndexManager.BP_SIZE,attribName,tbName);
        }else
        {
        }
        this.dirty=true;
    }
    public void setIndexName(String name)
    {
        this.indName=name;
        this.fullName=path+indName+".ind";
    }
    public Bucket find(Comparable key)
    {
        if(chooseBP)
        {
            return bt.find(key);
        }else
        {
        }        
        return null;
    }
    public boolean isEmpty()
    {
        return bt.isRootNull();
    }
    public void insert(Bucket bucket)
    {
        if(chooseBP)
        {
            bt.insert(bucket);
        }else
        {
        }        
    }
    public void delete(Comparable key)
    {
        if(chooseBP)
        {
        }else
        {
        }        
    }
    public String getAttribName()
    {
        if(chooseBP)
        {
            return bt.getAttr();
        }else
        {
            return null;
        }             
    }
    public void remove(Comparable key)
    {
        if(chooseBP)
        {
            bt.remove(key);
        }
        else
        {
        }
    }
    public String getTBName()
    {
        return bt.getHolder();
    }
    public boolean isDirty()
    {
        return dirty;
    }
    public void setDirty()
    {
        dirty=true;
    }
    public void clearDirty()
    {
        dirty=false;
    }
    public String getPath()
    {
        return path;
    }
    public String getFullName()
    {
        return fullName;
    }
    public ArrayList<Integer> findEqual(Comparable key)
    {
        if(chooseBP)
        {
            return bt.findE(key);
        }else
        {
            return null;
        }        
    }
    public ArrayList<Integer> findSmaller(Comparable key)
    {
        if(chooseBP)
        {
           return bt.findB(key);
        }else
        {
            return null;
        }        
    }
    public ArrayList<Integer> findSmallerOrEqual(Comparable key)
    {
        if(chooseBP)
        {
            return bt.findBE(key);
        }else
        {
            return null;
        }     
    }
    public ArrayList<Integer> findLarger(Comparable key)
    {
        if(chooseBP)
        {
            return bt.findA(key);
        }else
        {
            return null;
        }     
    }
    public ArrayList<Integer> findLargerOrEqual(Comparable key)
    {
        if(chooseBP)
        {
            return bt.findAE(key);
        }else
        {
            return null;
        }     
    }
    public String getIndexName()
    {
        return indName;
    }
}