org.apache.pdfbox.contentstream.operator.state.Restore Maven / Gradle / Ivy

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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.contentstream.operator.state;

import java.io.IOException;
import java.util.List;

import org.apache.pdfbox.contentstream.operator.Operator;
import org.apache.pdfbox.contentstream.operator.OperatorProcessor;
import org.apache.pdfbox.cos.COSBase;

/**
 * Q: Restore the graphics state.
 * 
 * @author Laurent Huault
 */
public class Restore extends OperatorProcessor
{
    @Override
    public void process(Operator operator, List arguments) throws IOException
    {
        if (context.getGraphicsStackSize() > 1)
        {
            context.restoreGraphicsState();
        }
        else
        {
            // this shouldn't happen but it does, see PDFBOX-161
            throw new EmptyGraphicsStackException();
        }
    }

    @Override
    public String getName()
    {
        return "Q";
    }
}