Consolidate read-only exception throwing for SVG*TearOffs

third_party/WebKit/Source/core/svg/SVGLengthTearOff.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 111 matching lines @@
 {
     return target()->unitMode();
 }
 
 float SVGLengthTearOff::value(ExceptionState& exceptionState)
 {
     if (target()->isRelative() && !canResolveRelativeUnits(contextElement())) {
         exceptionState.throwDOMException(NotSupportedError, "Could not resolve relative length.");
         return 0;
     }
-
     SVGLengthContext lengthContext(contextElement());
     return target()->value(lengthContext);
 }
 
 void SVGLengthTearOff::setValue(float value, ExceptionState& exceptionState)
 {
     if (isImmutable()) {
-        exceptionState.throwDOMException(NoModificationAllowedError, "The attribute is read-only.");
+        throwReadOnly(exceptionState);
         return;
     }
-
     if (target()->isRelative() && !canResolveRelativeUnits(contextElement())) {
         exceptionState.throwDOMException(NotSupportedError, "Could not resolve relative length.");
         return;
     }
-
     SVGLengthContext lengthContext(contextElement());
     if (target()->isCalculated())
         target()->setValueAsNumber(value);
     else
         target()->setValue(value, lengthContext);
-
     commitChange();
 }
 
 float SVGLengthTearOff::valueInSpecifiedUnits()
 {
     if (target()->isCalculated())
         return 0;
-
     return target()->valueInSpecifiedUnits();
 }
 
 void SVGLengthTearOff::setValueInSpecifiedUnits(float value, ExceptionState& exceptionState)
 {
     if (isImmutable()) {
-        exceptionState.throwDOMException(NoModificationAllowedError, "The attribute is read-only.");
+        throwReadOnly(exceptionState);
         return;
     }
-
     if (target()->isCalculated())
         target()->setValueAsNumber(value);
     else
         target()->setValueInSpecifiedUnits(value);
-
     commitChange();
 }
 
 String SVGLengthTearOff::valueAsString()
 {
     // TODO(shanmuga.m@samsung.com): Not all <length> properties have 0 (with no unit) as the default (lacuna) value, Need to return default value instead of 0
     return hasExposedLengthUnit() ? target()->valueAsString() : String::number(0);
 }
 
 void SVGLengthTearOff::setValueAsString(const String& str, ExceptionState& exceptionState)
 {
     if (isImmutable()) {
-        exceptionState.throwDOMException(NoModificationAllowedError, "The attribute is read-only.");
+        throwReadOnly(exceptionState);
         return;
     }
-
     String oldValue = target()->valueAsString();
-
     SVGParsingError status = target()->setValueAsString(str);
-
     if (status == SVGParseStatus::NoError && !hasExposedLengthUnit()) {
         target()->setValueAsString(oldValue); // rollback to old value
         status = SVGParseStatus::ParsingFailed;
     }
     if (status != SVGParseStatus::NoError) {
         exceptionState.throwDOMException(SyntaxError, "The value provided ('" + str + "') is invalid.");
         return;
     }
-
     commitChange();
 }
 
 void SVGLengthTearOff::newValueSpecifiedUnits(unsigned short unitType, float valueInSpecifiedUnits, ExceptionState& exceptionState)
 {
     if (isImmutable()) {
-        exceptionState.throwDOMException(NoModificationAllowedError, "The object is read-only.");
+        throwReadOnly(exceptionState);
         return;
     }
-
     if (!isValidLengthUnit(unitType)) {
         exceptionState.throwDOMException(NotSupportedError, "Cannot set value with unknown or invalid units (" + String::number(unitType) + ").");
         return;
     }
-
     target()->newValueSpecifiedUnits(toCSSUnitType(unitType), valueInSpecifiedUnits);
     commitChange();
 }
 
 void SVGLengthTearOff::convertToSpecifiedUnits(unsigned short unitType, ExceptionState& exceptionState)
 {
     if (isImmutable()) {
-        exceptionState.throwDOMException(NoModificationAllowedError, "The object is read-only.");
+        throwReadOnly(exceptionState);
         return;
     }
-
     if (!isValidLengthUnit(unitType)) {
         exceptionState.throwDOMException(NotSupportedError, "Cannot convert to unknown or invalid units (" + String::number(unitType) + ").");
         return;
     }
-
     if ((target()->isRelative() || CSSPrimitiveValue::isRelativeUnit(toCSSUnitType(unitType)))
         && !canResolveRelativeUnits(contextElement())) {
         exceptionState.throwDOMException(NotSupportedError, "Could not resolve relative length.");
         return;
     }
-
     SVGLengthContext lengthContext(contextElement());
     target()->convertToSpecifiedUnits(toCSSUnitType(unitType), lengthContext);
     commitChange();
 }
 
 SVGLengthTearOff::SVGLengthTearOff(SVGLength* target, SVGElement* contextElement, PropertyIsAnimValType propertyIsAnimVal, const QualifiedName& attributeName)
     : SVGPropertyTearOff<SVGLength>(target, contextElement, propertyIsAnimVal, attributeName)
 {
 }
 
 DEFINE_TRACE_WRAPPERS(SVGLengthTearOff)
 {
     visitor->traceWrappers(contextElement());
 }
 
 } // namespace blink