com.helger.pdflayout4.render.PreparationContextGlobal Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of ph-pdf-layout4 Show documentation
Library for creating nicely layouted PDF documents based on PDFBox
The newest version!
/*
 * Copyright (C) 2014-2021 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.helger.pdflayout4.render;

import java.io.IOException;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.NotThreadSafe;

import org.apache.pdfbox.pdmodel.PDDocument;

import com.helger.commons.ValueEnforcer;
import com.helger.commons.collection.impl.CommonsHashMap;
import com.helger.commons.collection.impl.ICommonsMap;
import com.helger.pdflayout4.debug.PLDebugLog;
import com.helger.pdflayout4.spec.FontSpec;
import com.helger.pdflayout4.spec.LoadedFont;
import com.helger.pdflayout4.spec.PreloadFont;

/**
 * The current global context for preparing an element. This object must be the
 * same for all prepared elements. It keeps all loaded fonts so that they are
 * not included more than once.
 *
 * @author Philip Helger
 */
@NotThreadSafe
public final class PreparationContextGlobal
{
  private final PDDocument m_aDoc;
  private final ICommonsMap  m_aFontCache = new CommonsHashMap <> ();

  /**
   * Constructor
   *
   * @param aDoc
   *        The {@link PDDocument} worked upon
   */
  public PreparationContextGlobal (@Nonnull final PDDocument aDoc)
  {
    ValueEnforcer.notNull (aDoc, "PDDocument");
    m_aDoc = aDoc;
  }

  /**
   * @return The {@link PDDocument} as provided in the constructor. Never
   *         null.
   */
  @Nonnull
  public PDDocument getDocument ()
  {
    return m_aDoc;
  }

  @Nonnull
  public LoadedFont getLoadedFont (@Nonnull final FontSpec aFontSpec) throws IOException
  {
    final PreloadFont aPreloadFont = aFontSpec.getPreloadFont ();
    LoadedFont aLoadedFont = m_aFontCache.get (aPreloadFont);
    if (aLoadedFont == null)
    {
      if (PLDebugLog.isDebugFont ())
        PLDebugLog.debugFont (aPreloadFont.toString (), "Loading into current document");

      aLoadedFont = new LoadedFont (aPreloadFont.loadPDFont (m_aDoc), aPreloadFont.getFallbackCodePoint ());
      m_aFontCache.put (aPreloadFont, aLoadedFont);
    }
    return aLoadedFont;
  }
}