PDFBOX-5861: avoid ClassCastException

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1919643 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineCapStyle.java

@@ -45,6 +45,10 @@ public void process(Operator operator, List<COSBase> arguments) throws IOExcepti
         {
             throw new MissingOperandException(operator, arguments);
         }
+        if (!checkArrayTypesClass(arguments, COSNumber.class))
+        {
+            return;
+        }
         int lineCapStyle = ((COSNumber)arguments.get( 0 )).intValue();
         getContext().getGraphicsState().setLineCap(lineCapStyle);
     }

pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineJoinStyle.java

@@ -47,6 +47,10 @@ public void process(Operator operator, List<COSBase> arguments) throws IOExcepti
         {
             throw new MissingOperandException(operator, arguments);
         }
+        if (!checkArrayTypesClass(arguments, COSNumber.class))
+        {
+            return;
+        }
         int lineJoinStyle = ((COSNumber)arguments.get( 0 )).intValue();
         getContext().getGraphicsState().setLineJoin(lineJoinStyle);
     }

pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineMiterLimit.java

@@ -46,6 +46,10 @@ public void process(Operator operator, List<COSBase> arguments) throws IOExcepti
         {
             throw new MissingOperandException(operator, arguments);
         }
+        if (!checkArrayTypesClass(arguments, COSNumber.class))
+        {
+            return;
+        }
         COSNumber miterLimit = (COSNumber)arguments.get( 0 );
         getContext().getGraphicsState().setMiterLimit(miterLimit.floatValue());
     }

pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineWidth.java

@@ -47,6 +47,10 @@ public void process(Operator operator, List<COSBase> arguments) throws IOExcepti
         {
             throw new MissingOperandException(operator, arguments);
         }
+        if (!checkArrayTypesClass(arguments, COSNumber.class))
+        {
+            return;
+        }
         COSNumber width = (COSNumber) arguments.get(0);
         getContext().getGraphicsState().setLineWidth(width.floatValue());
     }