src/org/objectweb/cjdbc/controller/cache/result/entries/ResultCacheEntry.java

説明を見る。

package org.objectweb.cjdbc.controller.cache.result.entries;

import org.objectweb.cjdbc.common.sql.SelectRequest;
import org.objectweb.cjdbc.common.stream.CJDBCStream;
import org.objectweb.cjdbc.controller.virtualdatabase.ControllerResultSet;

public abstract class ResultCacheEntry implements CacheEntry
{
  protected SelectRequest       request;
  protected ControllerResultSet result;
  protected int                 state;

  private CacheEntry            next;   // Chain for LRU
  private CacheEntry            prev;

  public ResultCacheEntry(SelectRequest request, ControllerResultSet result)
  {
    this.request = request;
    this.result = result;
    state = CACHE_VALID;
    next = null;
    prev = null;
  }

  public abstract String getType();

  public String getState()
  {
    if (isValid())
      return "Valid";
    if (isDirty())
      return "Dirty";
    else
      return "Invalid";
  }

  public boolean isValid()
  {
    return state == CACHE_VALID;
  }

  public boolean isDirty()
  {
    return state == CACHE_DIRTY;
  }

  public SelectRequest getRequest()
  {
    return request;
  }

  public ControllerResultSet getResult()
  {
    return result;
  }

  public void setResult(ControllerResultSet result)
  {
    this.result = result;
    state = CACHE_VALID;
  }

  public abstract void invalidate();

  public void markDirty()
  {
    state = CACHE_DIRTY;
  }

  public void setValid()
  {
    state = CACHE_VALID;
  }

  public CacheEntry getNext()
  {
    return next;
  }

  public void setNext(CacheEntry next)
  {
    this.next = next;
  }

  public CacheEntry getPrev()
  {
    return prev;
  }

  public void setPrev(CacheEntry prev)
  {
    this.prev = prev;
  }

  public abstract String[] toStringTable();

  public int getSizeOfResult()
  {
    try
    {
      return CJDBCStream.countBytes(result);
    }
    catch (Exception e)
    {
      return -1;
    }
  }

}

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