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With inspiration from other libraries
/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2011 INRIA, France Telecom
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.mvel2.asm.commons;
import java.util.HashMap;
import java.util.Map;
import org.mvel2.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 desc;
/**
* Maps primitive Java type names to their descriptors.
*/
private static final Map DESCRIPTORS;
static {
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");
}
/**
* Creates a new {@link Method}.
*
* @param name
* the method's name.
* @param desc
* the method's descriptor.
*/
public Method(final String name, final String desc) {
this.name = name;
this.desc = desc;
}
/**
* Creates 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 m
* a java.lang.reflect method descriptor
* @return a {@link Method} corresponding to the given Java method
* declaration.
*/
public static Method getMethod(java.lang.reflect.Method m) {
return new Method(m.getName(), Type.getMethodDescriptor(m));
}
/**
* Creates a new {@link Method}.
*
* @param c
* a java.lang.reflect constructor descriptor
* @return a {@link Method} corresponding to the given Java constructor
* declaration.
*/
public static Method getMethod(java.lang.reflect.Constructor c) {
return new Method("", Type.getConstructorDescriptor(c));
}
/**
* 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)
throws IllegalArgumentException {
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) throws IllegalArgumentException {
int space = method.indexOf(' ');
int start = method.indexOf('(', space) + 1;
int end = method.indexOf(')', start);
if (space == -1 || start == -1 || end == -1) {
throw new IllegalArgumentException();
}
String returnType = method.substring(0, space);
String methodName = method.substring(space + 1, start - 1).trim();
StringBuilder sb = new StringBuilder();
sb.append('(');
int p;
do {
String s;
p = method.indexOf(',', start);
if (p == -1) {
s = map(method.substring(start, end).trim(), defaultPackage);
} else {
s = map(method.substring(start, p).trim(), defaultPackage);
start = p + 1;
}
sb.append(s);
} while (p != -1);
sb.append(')');
sb.append(map(returnType, defaultPackage));
return new Method(methodName, sb.toString());
}
private static String map(final String type, final boolean defaultPackage) {
if ("".equals(type)) {
return type;
}
StringBuilder sb = new StringBuilder();
int index = 0;
while ((index = type.indexOf("[]", index) + 1) > 0) {
sb.append('[');
}
String t = type.substring(0, type.length() - sb.length() * 2);
String desc = DESCRIPTORS.get(t);
if (desc != null) {
sb.append(desc);
} else {
sb.append('L');
if (t.indexOf('.') < 0) {
if (!defaultPackage) {
sb.append("java/lang/");
}
sb.append(t);
} else {
sb.append(t.replace('.', '/'));
}
sb.append(';');
}
return sb.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 desc;
}
/**
* 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(desc);
}
/**
* 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(desc);
}
@Override
public String toString() {
return name + desc;
}
@Override
public boolean equals(final Object o) {
if (!(o instanceof Method)) {
return false;
}
Method other = (Method) o;
return name.equals(other.name) && desc.equals(other.desc);
}
@Override
public int hashCode() {
return name.hashCode() ^ desc.hashCode();
}
}