# MoveText.java

    /*
     * 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.contentstream.operator.text;

    import java.util.List;

    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.pdfbox.contentstream.operator.MissingOperandException;
    import org.apache.pdfbox.contentstream.operator.Operator;
    import org.apache.pdfbox.contentstream.operator.OperatorName;
    import org.apache.pdfbox.contentstream.operator.OperatorProcessor;
    import org.apache.pdfbox.cos.COSBase;
    import org.apache.pdfbox.cos.COSNumber;
    import org.apache.pdfbox.util.Matrix;

    /**
     * Td: Move text position.
     *
     * @author Laurent Huault
     */
    public class MoveText extends OperatorProcessor
    {
        private static final Log LOG = LogFactory.getLog(MoveText.class);

        @Override
        public void process(Operator operator, List<COSBase> arguments) throws MissingOperandException
        {
            if (arguments.size() < 2)
            {
                throw new MissingOperandException(operator, arguments);
            }
            Matrix textLineMatrix = context.getTextLineMatrix();
            if (textLineMatrix == null)
            {
                LOG.warn("TextLineMatrix is null, " + getName() + " operator will be ignored");
                return;
            }

            COSBase base0 = arguments.get(0);
            COSBase base1 = arguments.get(1);
            if (!(base0 instanceof COSNumber))
            {
                return;
            }
            if (!(base1 instanceof COSNumber))
            {
                return;
            }
            COSNumber x = (COSNumber) base0;
            COSNumber y = (COSNumber) base1;

            Matrix matrix = new Matrix(1, 0, 0, 1, x.floatValue(), y.floatValue());
            textLineMatrix.concatenate(matrix);
            context.setTextMatrix(textLineMatrix.clone());
        }

        @Override
        public String getName()
        {
            return OperatorName.MOVE_TEXT;
        }
    }