src/org/objectweb/cjdbc/controller/cache/result/schema/CacheDatabaseTable.java

説明を見る。

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

import java.io.Serializable;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;

import org.objectweb.cjdbc.common.sql.RequestType;
import org.objectweb.cjdbc.common.sql.schema.DatabaseColumn;
import org.objectweb.cjdbc.common.sql.schema.DatabaseTable;
import org.objectweb.cjdbc.controller.cache.result.entries.CacheEntry;
import org.objectweb.cjdbc.controller.cache.result.entries.ResultCacheEntry;

public class CacheDatabaseTable implements Serializable
{
  private String    name;
  private ArrayList columns;
  private ArrayList cacheEntries;  // Cache entries depending on this table
  private HashMap   pkCacheEntries; // Cache entries corresponding to a pk value

  public CacheDatabaseTable(DatabaseTable databaseTable)
  {
    // Clone the name and the columns
    name = databaseTable.getName();
    ArrayList origColumns = databaseTable.getColumns();
    int size = origColumns.size();
    columns = new ArrayList(size);
    for (int i = 0; i < size; i++)
      columns.add(new CacheDatabaseColumn(((DatabaseColumn) origColumns.get(i))
          .getName()));

    // Create an empty cache
    cacheEntries = new ArrayList();
    pkCacheEntries = new HashMap();
  }

  public String getName()
  {
    return name;
  }

  public void addColumn(CacheDatabaseColumn column)
  {
    columns.add(column);
  }

  public void mergeColumns(CacheDatabaseTable t) throws SQLException
  {
    if (t == null)
      return;

    ArrayList otherColumns = t.getColumns();
    if (otherColumns == null)
      return;

    int size = otherColumns.size();
    for (int i = 0; i < size; i++)
    {
      CacheDatabaseColumn c = (CacheDatabaseColumn) otherColumns.get(i);
      CacheDatabaseColumn original = getColumn(c.getName());
      if (original == null)
        addColumn(c);
      else
      {
        if (!original.equals(c))
          throw new SQLException("Column " + c.getName()
              + " definition mismatch.");
      }
    }
  }

  public ArrayList getColumns()
  {
    return columns;
  }

  public CacheDatabaseColumn getColumn(String columnName)
  {
    for (Iterator i = columns.iterator(); i.hasNext();)
    {
      CacheDatabaseColumn c = (CacheDatabaseColumn) i.next();
      if (columnName.compareToIgnoreCase(c.getName()) == 0)
        return c;
    }
    return null;
  }

  public boolean equals(Object other)
  {
    if (!(other instanceof CacheDatabaseTable))
      return false;

    CacheDatabaseTable t = (CacheDatabaseTable) other;
    return t.getName().equals(name) && t.getColumns().equals(columns);
  }

  public synchronized void addCacheEntry(CacheEntry ce)
  {
    cacheEntries.add(ce);
  }

  public void addPkCacheEntry(String pk, CacheEntry ce)
  {
    synchronized (pkCacheEntries)
    {
      pkCacheEntries.put(pk, ce);
    }
  }

  public ResultCacheEntry getPkResultCacheEntry(String pk)
  {
    if (pk == null)
      return null;
    synchronized (pkCacheEntries)
    {
      return (ResultCacheEntry) pkCacheEntries.get(pk);
    }
  }

  public void removePkResultCacheEntry(Object pk)
  {
    synchronized (pkCacheEntries)
    {
      ResultCacheEntry rce = (ResultCacheEntry) pkCacheEntries.remove(pk);
      rce.invalidate();
    }
  }

  public void invalidateAll()
  {
    synchronized (this)
    {
      for (Iterator i = cacheEntries.iterator(); i.hasNext();)
        ((ResultCacheEntry) i.next()).invalidate();
      cacheEntries.clear();

      for (int i = 0; i < columns.size(); i++)
        ((CacheDatabaseColumn) columns.get(i)).invalidateAll();
    }
    synchronized (pkCacheEntries)
    { // All pk cache entries have been invalidated as a side effect by the
      // above loop.
      pkCacheEntries.clear();
    }
  }

  public synchronized void invalidateAllExceptPk()
  {
    for (Iterator i = cacheEntries.iterator(); i.hasNext();)
    {
      ResultCacheEntry qce = (ResultCacheEntry) i.next();
      if (qce.getRequest().getCacheAbility() != RequestType.UNIQUE_CACHEABLE)
        qce.invalidate();
    }
    cacheEntries.clear();
  }

  public String getInformation(boolean longFormat)
  {
    String result = "Table " + name + ": ";
    int size = columns.size();
    for (int i = 0; i < size; i++)
    {
      CacheDatabaseColumn c = (CacheDatabaseColumn) columns.get(i);
      if (longFormat)
        result += "\n";
      result += c.getInformation();
      if (!longFormat && (i < size - 1))
        result += ",";
    }
    return result;
  }
}

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