org.apache.pdfbox.contentstream.operator.OperatorProcessor Maven / Gradle / Ivy
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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.contentstream.operator;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.contentstream.PDFStreamEngine;
import java.util.List;
import java.io.IOException;
/**
* Processes a PDF operator.
*
* @author Laurent Huault
*/
public abstract class OperatorProcessor
{
/** The processing context. */
protected PDFStreamEngine context;
/**
* Creates a new OperatorProcessor.
*/
protected OperatorProcessor()
{
}
/**
* Returns the processing context.
* @return the processing context
*/
protected final PDFStreamEngine getContext()
{
return context;
}
/**
* Sets the processing context.
* @param context the processing context.
*/
public void setContext(PDFStreamEngine context)
{
this.context = context;
}
/**
* Process the operator.
* @param operator the operator to process
* @param operands the operands to use when processing
* @throws IOException if the operator cannot be processed
*/
public abstract void process(Operator operator, List operands) throws IOException;
/**
* Returns the name of this operator, e.g. "BI".
*/
public abstract String getName();
/**
* Check whether all operands list elements are an instance of a specific class.
*
* @param operands The operands list.
* @param clazz The expected class.
* @return the boolean
*/
public boolean checkArrayTypesClass(List operands, Class clazz)
{
for (COSBase base : operands)
{
if (!clazz.isInstance(base))
{
return false;
}
}
return true;
}
}