src/org/objectweb/cjdbc/controller/backend/rewriting/SimpleRewritingRule.java

説明を見る。

package org.objectweb.cjdbc.controller.backend.rewriting;

public class SimpleRewritingRule extends AbstractRewritingRule
{

  private int queryPatternLength;

  public SimpleRewritingRule(String queryPattern, String rewrite,
      boolean caseSensitive, boolean stopOnMatch)
  {
    super(queryPattern, caseSensitive ? rewrite : rewrite.toLowerCase(),
        caseSensitive, stopOnMatch);
    queryPatternLength = queryPattern.length();
  }

  public String rewrite(String sqlQuery)
  {
    // Check first if it is a match
    int start;
    if (isCaseSensitive)
      start = sqlQuery.indexOf(queryPattern);
    else
      start = sqlQuery.toLowerCase().indexOf(queryPattern);
    if (start == -1)
    { // No match
      hasMatched = false;
      return sqlQuery;
    }
    // Match, rewrite the query
    hasMatched = true;
    if (start == 0)
    {
      if (queryPatternLength < sqlQuery.length())
        // Match at the beginning of the pattern
        return rewrite + sqlQuery.substring(queryPatternLength);
      else
        // The query was exactly the pattern
        return rewrite;
    }
    else
    {
      if (start + queryPatternLength < sqlQuery.length())
        return sqlQuery.substring(0, start) + rewrite
            + sqlQuery.substring(start + queryPatternLength);
      else
        // Match at the end of the pattern
        return sqlQuery.substring(0, start) + rewrite;
    }
  }
  
}

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