# OperatorProcessor.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;

    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<COSBase> 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<COSBase> operands, Class<?> clazz)
        {
            return operands.stream().allMatch(clazz::isInstance);
        }
    }