uk.ac.ed.ph.snuggletex.dombuilding.ModeDelegatingHandler Maven / Gradle / Ivy

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/* $Id: ModeDelegatingHandler.java 525 2010-01-05 14:07:36Z davemckain $
 *
 * Copyright (c) 2010, The University of Edinburgh.
 * All Rights Reserved
 */
package uk.ac.ed.ph.snuggletex.dombuilding;

import uk.ac.ed.ph.snuggletex.definitions.LaTeXMode;
import uk.ac.ed.ph.snuggletex.internal.DOMBuilder;
import uk.ac.ed.ph.snuggletex.internal.SnuggleParseException;
import uk.ac.ed.ph.snuggletex.tokens.CommandToken;

import org.w3c.dom.Element;

/**
 * Trivial "meta"-builder that delegates to a {@link CommandHandler} depending on whether we are in
 * MATH or TEXT mode.
 *
 * This is useful for things like \\underline
 *
 * @author David McKain
 * @version $Revision: 525 $
 */
public final class ModeDelegatingHandler implements CommandHandler {

  private final CommandHandler textModeBuilder;
  private final CommandHandler mathModeBuilder;

  public ModeDelegatingHandler(
      final CommandHandler textModeBuilder, final CommandHandler mathModeBuilder) {
    this.textModeBuilder = textModeBuilder;
    this.mathModeBuilder = mathModeBuilder;
  }

  public void handleCommand(DOMBuilder builder, Element parentElement, CommandToken token)
      throws SnuggleParseException {
    if (token.getLatexMode() == LaTeXMode.MATH) {
      mathModeBuilder.handleCommand(builder, parentElement, token);
    } else {
      textModeBuilder.handleCommand(builder, parentElement, token);
    }
  }
}