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package serp.bytecode;
import java.util.*;
/**
* Caching and conversion of names in both internal and external form.
*
* @author Abe White
*/
public class NameCache {
static final Object[][] _codes = new Object[][] {
{ byte.class, "B" },
{ char.class, "C" },
{ double.class, "D" },
{ float.class, "F" },
{ int.class, "I" },
{ long.class, "J" },
{ short.class, "S" },
{ boolean.class, "Z" },
{ void.class, "V" },
};
// caches of internal and external forms of strings
private final Map _internal = new HashMap();
private final Map _internalDescriptor = new HashMap();
private final Map _external = new HashMap();
private final Map _externalHuman = new HashMap();
/**
* Converts the given class name to its internal form.
*
* @param className the name to convert
* @param descriptor true if the name is to be used for a descriptor
* section -- the difference seems to be that for
* descriptors, non-primitives are prefixed with 'L' and ended with ';'
*/
public String getInternalForm(String className, boolean descriptor) {
if (className == null || className.length() == 0)
return className;
Map cache = (descriptor) ? _internalDescriptor : _internal;
String cached = (String) cache.get(className);
if (cached != null)
return cached;
String ret = getInternalFormInternal(className, descriptor);
cache.put(className, ret);
return ret;
}
/**
* @see #getInternalForm
*/
private String getInternalFormInternal(String cls, boolean descriptor) {
// handle array types, whether already in internal form or not
StringBuilder prefix = new StringBuilder();
while (true) {
if (cls.endsWith("[]")) {
prefix.append("[");
cls = cls.substring(0, cls.length() - 2);
} else if (cls.startsWith("[")) {
prefix.append("[");
cls = cls.substring(1);
} else
break;
}
// handle primitive array types
for (int i = 0; i < _codes.length; i++)
if (cls.equals(_codes[i][1].toString())
|| cls.equals(_codes[i][0].toString()))
return prefix.append(_codes[i][1]).toString();
// if in descriptor form, strip leading 'L' and trailing ';'
if (cls.startsWith("L") && cls.endsWith(";"))
cls = cls.substring(1, cls.length() - 1);
// non-primitive; make sure we don't prefix method descriptors with 'L'
cls = cls.replace('.', '/');
if ((descriptor || prefix.length() > 0) && cls.charAt(0) != '(')
return prefix.append("L").append(cls).append(";").toString();
return prefix.append(cls).toString();
}
/**
* Given the internal name of the class, return the 'normal' java name.
*
* @param internalName the internal name being used
* @param humanReadable if the returned name should be in human-readable
* form, rather than a form suitable for a
* {@link Class#forName} call -- the difference
* lies in the handling of arrays
*/
public String getExternalForm(String internalName, boolean humanReadable) {
if (internalName == null || internalName.length() == 0)
return internalName;
Map cache = (humanReadable) ? _externalHuman : _external;
String cached = (String) cache.get(internalName);
if (cached != null)
return cached;
String ret = getExternalFormInternal(internalName, humanReadable);
cache.put(internalName, ret);
return ret;
}
/**
* @see #getExternalForm
*/
private String getExternalFormInternal(String intern,
boolean humanReadable) {
if (!humanReadable) {
// check against primitives
for (int i = 0; i < _codes.length; i++) {
if (intern.equals(_codes[i][1].toString()))
return _codes[i][0].toString();
if (intern.equals(_codes[i][0].toString()))
return intern;
}
intern = getInternalForm(intern, false);
return intern.replace('/', '.');
}
// handle arrays
StringBuilder postfix = new StringBuilder(2);
while (intern.startsWith("[")) {
intern = intern.substring(1);
postfix.append("[]");
}
// strip off leading 'L' and trailing ';'
if (intern.endsWith(";"))
intern = intern.substring(1, intern.length() - 1);
// check primitives
for (int i = 0; i < _codes.length; i++)
if (intern.equals(_codes[i][1].toString()))
return _codes[i][0].toString() + postfix;
return intern.replace('/', '.') + postfix;
}
/**
* Construct a method descriptor from the given return and parameter
* types, which will be converted to internal form.
*/
public String getDescriptor(String returnType, String[] paramTypes) {
StringBuilder buf = new StringBuilder();
buf.append("(");
if (paramTypes != null) {
for (int i = 0; i < paramTypes.length; i++) {
if (paramTypes[i] == null)
throw new NullPointerException("paramTypes[" + i
+ "] = null");
buf.append(getInternalForm(paramTypes[i], true));
}
}
buf.append(")");
if (returnType == null)
throw new NullPointerException("returnType = null");
buf.append(getInternalForm(returnType, true));
return buf.toString();
}
/**
* Return the return type, in internal form, for the given method
* descriptor string.
*/
public String getDescriptorReturnName(String descriptor) {
int index = descriptor.indexOf(')');
if (index == -1)
return "";
return descriptor.substring(descriptor.indexOf(')') + 1);
}
/**
* Return the parameter types, in internal form, for the given method
* descriptor string.
*/
public String[] getDescriptorParamNames(String descriptor) {
if (descriptor == null || descriptor.length() == 0)
return new String[0];
int index = descriptor.indexOf(')');
if (index == -1)
return new String[0];
// get rid of the parens and the return type
descriptor = descriptor.substring(1, index);
// break the param string into individual params
List tokens = new LinkedList();
while (descriptor.length() > 0) {
index = 0;
// skip the '[' up to the first letter code
while (!Character.isLetter(descriptor.charAt(index)))
index++;
// non-primitives always start with 'L' and end with ';'
if (descriptor.charAt(index) == 'L')
index = descriptor.indexOf(';');
tokens.add(descriptor.substring(0, index + 1));
descriptor = descriptor.substring(index + 1);
}
return (String[]) tokens.toArray(new String[tokens.size()]);
}
/**
* Return the component type name for the given array type, or null
* if the given string does not represent an array type name. The name
* given should be in proper {@link Class#forName} form.
*/
public String getComponentName(String name) {
if (name == null || !name.startsWith("["))
return null;
name = name.substring(1);
if (!name.startsWith("[") && name.endsWith(";"))
name = name.substring(1, name.length() - 1);
// will convert primitive type codes to names
return getExternalForm(name, false);
}
/**
* Clear the cache.
*/
public void clear() {
_internal.clear();
_internalDescriptor.clear();
_external.clear();
_externalHuman.clear();
}
}
