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The Apache PDFBox library is an open source Java tool for working with PDF documents.
There is a newer version: 3.0.2
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.pdfbox.util.operator;

import java.util.List;

import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSNumber;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.util.PDFOperator;

import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.pdmodel.font.PDFontFactory;

/**
 * @author Huault : [email protected]
 * @version $Revision: 1.5 $
 */

public class SetTextFont extends OperatorProcessor
{
    private static final Log LOG = LogFactory.getLog(SetTextFont.class);
    
    /**
     * Tf selectfont Set text font and size.
     * @param operator The operator that is being executed.
     * @param arguments List
     * @throws IOException If an error occurs while processing the font.
     */
    public void process(PDFOperator operator, List arguments) throws IOException
    {
        //there are some documents that are incorrectly structured and
        //arguments are in the wrong spot, so we will silently ignore them
        //if there are no arguments
        if( arguments.size() >= 2 )
        {
            //set font and size
            COSBase base0 = arguments.get(0);
            COSBase base1 = arguments.get(1);
            if (!(base0 instanceof COSName))
            {
                return;
            }
            if (!(base1 instanceof COSNumber))
            {
                return;
            }
            COSName fontName = (COSName) base0;
            float fontSize = ((COSNumber) base1).floatValue();
            context.getGraphicsState().getTextState().setFontSize( fontSize );

            PDFont font = (PDFont) context.getFonts().get(fontName.getName());
            if( font == null )
            {
                LOG.error("Could not find font(" + fontName + ") in map=" + context.getFonts() + ", creating default font");
                font = PDFontFactory.createDefaultFont();
            }
            context.getGraphicsState().getTextState().setFont(font);
        }
    }

}