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// Modified or written by Object Mentor, Inc. for inclusion with FitNesse.
// Copyright (c) 2002 Cunningham & Cunningham, Inc.
// Released under the terms of the GNU General Public License version 2 or later.
package fit;

// Copyright (c) 2002 Cunningham & Cunningham, Inc.
// Released under the terms of the GNU General Public License version 2 or later.

public class ColumnFixture extends Fixture {

  protected Binding columnBindings[];
  protected boolean hasExecuted = false;

  // Traversal ////////////////////////////////

  public void doRows(Parse rows) {
    bind(rows.parts);
    super.doRows(rows.more);
  }

  public void doRow(Parse row) {
    hasExecuted = false;
    try {
      reset();
      super.doRow(row);
      if (!hasExecuted) {
        execute();
      }
    }
    catch (Exception e) {
      exception(row.leaf(), e);
    }
  }

  public void doCell(Parse cell, int column) {
    try {
      columnBindings[column].doCell(this, cell);
    }
    catch (Throwable e) {
      exception(cell, e);
    }
  }

  public void check(Parse cell, TypeAdapter a) {
    try {
      executeIfNeeded();
    }
    catch (Exception e) {
      exception(cell, e);
    }
    super.check(cell, a);
  }

  protected void executeIfNeeded() throws Exception {
    if (!hasExecuted) {
      hasExecuted = true;
      execute();
    }
  }

  public void reset() throws Exception {
    // about to process first cell of row
  }

  public void execute() throws Exception {
    // about to process first method call of row
  }

  // Utility //////////////////////////////////

  protected void bind(Parse heads) {
    try {
      columnBindings = new Binding[heads.size()];
      for (int i = 0; heads != null; i++, heads = heads.more) {
        columnBindings[i] = createBinding(i, heads);
      }
    }
    catch (Throwable throwable) {
      exception(heads, throwable);
    }
  }

  protected Binding createBinding(int column, Parse heads) throws Throwable {
    return Binding.create(this, heads.text());
  }

}