# SetColor.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.color;

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

    import org.apache.pdfbox.contentstream.operator.MissingOperandException;
    import org.apache.pdfbox.contentstream.operator.Operator;
    import org.apache.pdfbox.contentstream.operator.OperatorProcessor;
    import org.apache.pdfbox.cos.COSArray;
    import org.apache.pdfbox.cos.COSBase;
    import org.apache.pdfbox.cos.COSNumber;
    import org.apache.pdfbox.pdmodel.graphics.color.PDColor;
    import org.apache.pdfbox.pdmodel.graphics.color.PDColorSpace;
    import org.apache.pdfbox.pdmodel.graphics.color.PDPattern;

    /**
     * sc,scn,SC,SCN: Sets the color to use for stroking or non-stroking operations.
     *
     * @author John Hewson
     */
    public abstract class SetColor extends OperatorProcessor
    {
        @Override
        public void process(Operator operator, List<COSBase> arguments) throws IOException
        {
            PDColorSpace colorSpace = getColorSpace();
            if (!(colorSpace instanceof PDPattern))
            {
                if (arguments.size() < colorSpace.getNumberOfComponents())
                {
                    throw new MissingOperandException(operator, arguments);
                }
                if (!checkArrayTypesClass(arguments, COSNumber.class))
                {
                    return;
                }
            }
            COSArray array = new COSArray();
            array.addAll(arguments);
            setColor(new PDColor(array, colorSpace));
        }

        /**
         * Returns either the stroking or non-stroking color value.
         * @return The stroking or non-stroking color value.
         */
        protected abstract PDColor getColor();

        /**
         * Sets either the stroking or non-stroking color value.
         * @param color The stroking or non-stroking color value.
         */
        protected abstract void setColor(PDColor color);

        /**
         * Returns either the stroking or non-stroking color space.
         * @return The stroking or non-stroking color space.
         */
        protected abstract PDColorSpace getColorSpace();
    }