org.objectweb.asm.commons.Method Maven / Gradle / Ivy
// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
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//
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// notice, this list of conditions and the following disclaimer in the
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package org.objectweb.asm.commons;
import java.util.HashMap;
import java.util.Map;
import org.objectweb.asm.Type;
/**
* A named method descriptor.
*
* @author Juozas Baliuka
* @author Chris Nokleberg
* @author Eric Bruneton
*/
public class Method {
/** The method name. */
private final String name;
/** The method descriptor. */
private final String descriptor;
/** The descriptors of the primitive Java types (plus void). */
private static final Map PRIMITIVE_TYPE_DESCRIPTORS;
static {
HashMap descriptors = new HashMap<>();
descriptors.put("void", "V");
descriptors.put("byte", "B");
descriptors.put("char", "C");
descriptors.put("double", "D");
descriptors.put("float", "F");
descriptors.put("int", "I");
descriptors.put("long", "J");
descriptors.put("short", "S");
descriptors.put("boolean", "Z");
PRIMITIVE_TYPE_DESCRIPTORS = descriptors;
}
/**
* Constructs a new {@link Method}.
*
* @param name the method's name.
* @param descriptor the method's descriptor.
*/
public Method(final String name, final String descriptor) {
this.name = name;
this.descriptor = descriptor;
}
/**
* Constructs a new {@link Method}.
*
* @param name the method's name.
* @param returnType the method's return type.
* @param argumentTypes the method's argument types.
*/
public Method(final String name, final Type returnType, final Type[] argumentTypes) {
this(name, Type.getMethodDescriptor(returnType, argumentTypes));
}
/**
* Creates a new {@link Method}.
*
* @param method a java.lang.reflect method descriptor
* @return a {@link Method} corresponding to the given Java method declaration.
*/
public static Method getMethod(final java.lang.reflect.Method method) {
return new Method(method.getName(), Type.getMethodDescriptor(method));
}
/**
* Creates a new {@link Method}.
*
* @param constructor a java.lang.reflect constructor descriptor
* @return a {@link Method} corresponding to the given Java constructor declaration.
*/
public static Method getMethod(final java.lang.reflect.Constructor constructor) {
return new Method("", Type.getConstructorDescriptor(constructor));
}
/**
* Returns a {@link Method} corresponding to the given Java method declaration.
*
* @param method a Java method declaration, without argument names, of the form "returnType name
* (argumentType1, ... argumentTypeN)", where the types are in plain Java (e.g. "int",
* "float", "java.util.List", ...). Classes of the java.lang package can be specified by their
* unqualified name; all other classes names must be fully qualified.
* @return a {@link Method} corresponding to the given Java method declaration.
* @throws IllegalArgumentException if method could not get parsed.
*/
public static Method getMethod(final String method) {
return getMethod(method, false);
}
/**
* Returns a {@link Method} corresponding to the given Java method declaration.
*
* @param method a Java method declaration, without argument names, of the form "returnType name
* (argumentType1, ... argumentTypeN)", where the types are in plain Java (e.g. "int",
* "float", "java.util.List", ...). Classes of the java.lang package may be specified by their
* unqualified name, depending on the defaultPackage argument; all other classes names must be
* fully qualified.
* @param defaultPackage true if unqualified class names belong to the default package, or false
* if they correspond to java.lang classes. For instance "Object" means "Object" if this
* option is true, or "java.lang.Object" otherwise.
* @return a {@link Method} corresponding to the given Java method declaration.
* @throws IllegalArgumentException if method could not get parsed.
*/
public static Method getMethod(final String method, final boolean defaultPackage) {
final int spaceIndex = method.indexOf(' ');
int currentArgumentStartIndex = method.indexOf('(', spaceIndex) + 1;
final int endIndex = method.indexOf(')', currentArgumentStartIndex);
if (spaceIndex == -1 || currentArgumentStartIndex == 0 || endIndex == -1) {
throw new IllegalArgumentException();
}
final String returnType = method.substring(0, spaceIndex);
final String methodName =
method.substring(spaceIndex + 1, currentArgumentStartIndex - 1).trim();
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append('(');
int currentArgumentEndIndex;
do {
String argumentDescriptor;
currentArgumentEndIndex = method.indexOf(',', currentArgumentStartIndex);
if (currentArgumentEndIndex == -1) {
argumentDescriptor =
getDescriptorInternal(
method.substring(currentArgumentStartIndex, endIndex).trim(), defaultPackage);
} else {
argumentDescriptor =
getDescriptorInternal(
method.substring(currentArgumentStartIndex, currentArgumentEndIndex).trim(),
defaultPackage);
currentArgumentStartIndex = currentArgumentEndIndex + 1;
}
stringBuilder.append(argumentDescriptor);
} while (currentArgumentEndIndex != -1);
stringBuilder.append(')').append(getDescriptorInternal(returnType, defaultPackage));
return new Method(methodName, stringBuilder.toString());
}
/**
* Returns the descriptor corresponding to the given type name.
*
* @param type a Java type name.
* @param defaultPackage true if unqualified class names belong to the default package, or false
* if they correspond to java.lang classes. For instance "Object" means "Object" if this
* option is true, or "java.lang.Object" otherwise.
* @return the descriptor corresponding to the given type name.
*/
private static String getDescriptorInternal(final String type, final boolean defaultPackage) {
if ("".equals(type)) {
return type;
}
StringBuilder stringBuilder = new StringBuilder();
int arrayBracketsIndex = 0;
while ((arrayBracketsIndex = type.indexOf("[]", arrayBracketsIndex) + 1) > 0) {
stringBuilder.append('[');
}
String elementType = type.substring(0, type.length() - stringBuilder.length() * 2);
String descriptor = PRIMITIVE_TYPE_DESCRIPTORS.get(elementType);
if (descriptor != null) {
stringBuilder.append(descriptor);
} else {
stringBuilder.append('L');
if (elementType.indexOf('.') < 0) {
if (!defaultPackage) {
stringBuilder.append("java/lang/");
}
stringBuilder.append(elementType);
} else {
stringBuilder.append(elementType.replace('.', '/'));
}
stringBuilder.append(';');
}
return stringBuilder.toString();
}
/**
* Returns the name of the method described by this object.
*
* @return the name of the method described by this object.
*/
public String getName() {
return name;
}
/**
* Returns the descriptor of the method described by this object.
*
* @return the descriptor of the method described by this object.
*/
public String getDescriptor() {
return descriptor;
}
/**
* Returns the return type of the method described by this object.
*
* @return the return type of the method described by this object.
*/
public Type getReturnType() {
return Type.getReturnType(descriptor);
}
/**
* Returns the argument types of the method described by this object.
*
* @return the argument types of the method described by this object.
*/
public Type[] getArgumentTypes() {
return Type.getArgumentTypes(descriptor);
}
@Override
public String toString() {
return name + descriptor;
}
@Override
public boolean equals(final Object other) {
if (!(other instanceof Method)) {
return false;
}
Method otherMethod = (Method) other;
return name.equals(otherMethod.name) && descriptor.equals(otherMethod.descriptor);
}
@Override
public int hashCode() {
return name.hashCode() ^ descriptor.hashCode();
}
}
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