How to use

checkState

method

in

com.itextpdf.text.pdf.PdfContentByte

public void showTextGid(final String gids) {
  checkState();
  if (!inText && isTagged()) {
    beginText(true);
  }
  if (state.fontDetails == null)
    throw new NullPointerException(MessageLocalization.getComposedMessage("font.and.size.must.be.set.before.writing.any.text"));
  Object[] objs = state.fontDetails.convertToBytesGid(gids);
  StringUtils.escapeString((byte[]) objs[0], content);
  state.tx += ((Integer)objs[2]).intValue() * 0.001f * state.size;
  content.append("Tj").append_i(separator);
}

public void showTextGid(final String gids) {
  checkState();
  if (!inText && isTagged()) {
    beginText(true);
  }
  if (state.fontDetails == null)
    throw new NullPointerException(MessageLocalization.getComposedMessage("font.and.size.must.be.set.before.writing.any.text"));
  Object[] objs = state.fontDetails.convertToBytesGid(gids);
  StringUtils.escapeString((byte[]) objs[0], content);
  state.tx += ((Integer)objs[2]).intValue() * 0.001f * state.size;
  content.append("Tj").append_i(separator);
}

/**
 * Shows the <CODE>text</CODE>.
 *
 * @param text the text to write
 */
public void showText(final String text) {
  checkState();
  if (!inText && isTagged()) {
    beginText(true);
  }
  showText2(text);
  updateTx(text, 0);
  content.append("Tj").append_i(separator);
}

/**
 * Moves to the next line and shows <CODE>text</CODE>.
 *
 * @param text the text to write
 */
public void newlineShowText(final String text) {
  checkState();
  if (!inText && isTagged()) {
    beginText(true);
  }
  state.yTLM -= state.leading;
  showText2(text);
  content.append("'").append_i(separator);
  state.tx = state.xTLM;
  updateTx(text, 0);
}

/**
 * Shows the <CODE>text</CODE>.
 *
 * @param text the text to write
 */
public void showText(final String text) {
  checkState();
  if (!inText && isTagged()) {
    beginText(true);
  }
  showText2(text);
  updateTx(text, 0);
  content.append("Tj").append_i(separator);
}

/**
 * Moves to the next line and shows <CODE>text</CODE>.
 *
 * @param text the text to write
 */
public void newlineShowText(final String text) {
  checkState();
  if (!inText && isTagged()) {
    beginText(true);
  }
  state.yTLM -= state.leading;
  showText2(text);
  content.append("'").append_i(separator);
  state.tx = state.xTLM;
  updateTx(text, 0);
}

checkState();
if (!inText && isTagged()) {
  beginText(true);

checkState();
if (!inText && isTagged()) {
  beginText(true);

/**
 * Moves to the next line and shows text string, using the given values of the character and word spacing parameters.
 *
 * @param       wordSpacing     a parameter
 * @param       charSpacing     a parameter
 * @param text the text to write
 */
public void newlineShowText(final float wordSpacing, final float charSpacing, final String text) {
  checkState();
  if (!inText && isTagged()) {
    beginText(true);
  }
  state.yTLM -= state.leading;
  content.append(wordSpacing).append(' ').append(charSpacing);
  showText2(text);
  content.append("\"").append_i(separator);
  // The " operator sets charSpace and wordSpace into graphics state
  // (cfr PDF reference v1.6, table 5.6)
  state.charSpace = charSpacing;
  state.wordSpace = wordSpacing;
  state.tx = state.xTLM;
  updateTx(text, 0);
}

/**
 * Moves to the next line and shows text string, using the given values of the character and word spacing parameters.
 *
 * @param       wordSpacing     a parameter
 * @param       charSpacing     a parameter
 * @param text the text to write
 */
public void newlineShowText(final float wordSpacing, final float charSpacing, final String text) {
  checkState();
  if (!inText && isTagged()) {
    beginText(true);
  }
  state.yTLM -= state.leading;
  content.append(wordSpacing).append(' ').append(charSpacing);
  showText2(text);
  content.append("\"").append_i(separator);
  // The " operator sets charSpace and wordSpace into graphics state
  // (cfr PDF reference v1.6, table 5.6)
  state.charSpace = charSpacing;
  state.wordSpace = wordSpacing;
  state.tx = state.xTLM;
  updateTx(text, 0);
}