https://issues.apache.org/bugzilla/show_bug.cgi?id=54017
Priority: P2
Bug ID: 54017
Assignee: [email protected]
Summary: new String instance is generated for constant string
in Generator.convertString
Severity: normal
Classification: Unclassified
Reporter: [email protected]
Hardware: PC
Status: NEW
Version: trunk
Component: Jasper
Product: Tomcat 7
If the target class is "Object.class", the generator generates
"new String(" + quoted + ")";
as attribute value for Tag Handler.
How about using quoted directly same as when the target class is
"Object.class"?
Creating a String instance will cause some overhead from memory allocation and
hash code recaluation when it is used as a key on HashMap.
Here is the detail code,
/*
* @param c The target class to which to coerce the given string @param
* s The string value @param attrName The name of the attribute whose
* value is being supplied @param propEditorClass The property editor
* for the given attribute @param isNamedAttribute true if the given
* attribute is a named attribute (that is, specified using the
* jsp:attribute standard action), and false otherwise
*/
private String convertString(Class<?> c, String s, String attrName,
Class<?> propEditorClass, boolean isNamedAttribute) {
String quoted = s;
if (!isNamedAttribute) {
quoted = quote(s);
}
if (propEditorClass != null) {
String className = c.getCanonicalName();
return "("
+ className
+
")org.apache.jasper.runtime.JspRuntimeLibrary.getValueFromBeanInfoPropertyEditor("
+ className + ".class, \"" + attrName + "\", " + quoted
+ ", " + propEditorClass.getCanonicalName() +
".class)";
} else if (c == String.class) {
return quoted;
} else if (c == boolean.class) {
return JspUtil.coerceToPrimitiveBoolean(s, isNamedAttribute);
} else if (c == Boolean.class) {
return JspUtil.coerceToBoolean(s, isNamedAttribute);
} else if (c == byte.class) {
return JspUtil.coerceToPrimitiveByte(s, isNamedAttribute);
} else if (c == Byte.class) {
return JspUtil.coerceToByte(s, isNamedAttribute);
} else if (c == char.class) {
return JspUtil.coerceToChar(s, isNamedAttribute);
} else if (c == Character.class) {
return JspUtil.coerceToCharacter(s, isNamedAttribute);
} else if (c == double.class) {
return JspUtil.coerceToPrimitiveDouble(s, isNamedAttribute);
} else if (c == Double.class) {
return JspUtil.coerceToDouble(s, isNamedAttribute);
} else if (c == float.class) {
return JspUtil.coerceToPrimitiveFloat(s, isNamedAttribute);
} else if (c == Float.class) {
return JspUtil.coerceToFloat(s, isNamedAttribute);
} else if (c == int.class) {
return JspUtil.coerceToInt(s, isNamedAttribute);
} else if (c == Integer.class) {
return JspUtil.coerceToInteger(s, isNamedAttribute);
} else if (c == short.class) {
return JspUtil.coerceToPrimitiveShort(s, isNamedAttribute);
} else if (c == Short.class) {
return JspUtil.coerceToShort(s, isNamedAttribute);
} else if (c == long.class) {
return JspUtil.coerceToPrimitiveLong(s, isNamedAttribute);
} else if (c == Long.class) {
return JspUtil.coerceToLong(s, isNamedAttribute);
} else if (c == Object.class) {
return "new String(" + quoted + ")";
} else {
String className = c.getCanonicalName();
return "("
+ className
+
")org.apache.jasper.runtime.JspRuntimeLibrary.getValueFromPropertyEditorManager("
+ className + ".class, \"" + attrName + "\", " + quoted
+ ")";
}
}
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