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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* 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.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.pdmodel.graphics.PDGraphicsState;
import org.apache.pdfbox.util.PDFOperator;
/**
* Process the Q operator.
*
* @author Huault : [email protected]
*
*/
public class GRestore extends OperatorProcessor
{
/**
* Log instance.
*/
private static final Log LOG = LogFactory.getLog(GRestore.class);
/**
* {@inheritDoc}
*/
public void process(PDFOperator operator, List arguments)
{
if (context.getGraphicsStack().size() > 0)
{
context.setGraphicsState((PDGraphicsState) context.getGraphicsStack().pop());
}
else
{
// this shouldn't happen but it does, see PDFBOX-161
// TODO make this self healing mechanism optional for preflight??
LOG.error("GRestore: no graphics state left to be restored.");
}
}
}