holder.java

一个简单的数据库

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package bufferedManager;

/**
 *
 * @author outlaw
 */
public class Holder {
    boolean[] holds;
    int size;
    int availableNumber;
    
    public Holder(int size)
    {
        this.size=size;
        holds=new boolean[size];
        for(int i=0;i<size;i++)
            holds[i]=false;
        availableNumber=size;
    }
    public int getAvailableNumber()
    {
        return availableNumber;
    }
    public boolean isFull()
    {
        if(getAvailableNumber()==0)
            return true;
        return false;
    }
    public void setHold(int index)
    {
        holds[index]=true;
        availableNumber--;
    }
    public void setNotHold(int index)
    {
        holds[index]=false;
        availableNumber++;
    }
    public boolean isHold(int index)
    {
        return holds[index];
    }
    public int[] getAvailablePos()
    {
        int[] pos=new int[availableNumber];
        for(int i=0,j=0;i<size;i++)
        {
            if(holds[i]==false)
                pos[j++]=i;
        }
        return pos;
    }
    public int[] getNotAvailablePos()
    {
        int[] pos=new int[size-availableNumber];
        for(int i=0,j=0;i<size;i++)
        {
            if(holds[i])
                pos[j++]=i;
        }
        return pos;
    }
    public boolean[] getHolders()
    {
        return holds;
    }
    public int getFirstAvailablePos()
    {
        for(int i=0;i<holds.length;i++)
        {
            if(!holds[i])
                return i;
        }
        return -1;
    }
}