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/*
* Signature.java
*
* comments here.
*
* @author Michiaki Tatsubori
* @version %VERSION% %DATE%
* @see java.lang.Object
*
* COPYRIGHT 1999 by Michiaki Tatsubori, ALL RIGHTS RESERVED.
*/
package io.devnulllabs.openjava.mop;
/**
* The class <code>Signature</code> represents a signature of members of
* class; innerclass, field, method, or constructor.
* <p>
* Objects are immutable.
* </pre>
* <p>
*
* @author Michiaki Tatsubori
* @version 1.0
* @since $Id: Signature.java,v 1.2 2003/02/19 02:55:01 tatsubori Exp $
* @see java.lang.Object
*/
public final class Signature {
public static final int CLASS = 0;
public static final int FIELD = 1;
public static final int METHOD = 2;
public static final int CONSTRUCTOR = 3;
private int _kind;
private OJClass _returnType;
private String _name;
private OJClass[] _parameters;
public Signature(String name) {
_kind = FIELD;
/*_returnType = null;*/
_name = name;
_parameters = null;
}
public Signature(String name, OJClass[] paramtypes) {
if (paramtypes == null)
paramtypes = new OJClass[0];
_kind = METHOD;
_returnType = null;
_name = name;
_parameters = (OJClass[]) paramtypes.clone();
}
public Signature(OJClass[] paramtypes) {
if (paramtypes == null)
paramtypes = new OJClass[0];
_kind = CONSTRUCTOR;
_returnType = null;
_name = null;
_parameters = (OJClass[]) paramtypes.clone();
}
public Signature(OJClass clazz) {
_kind = CLASS;
/*_returnType = null;*/
_name = clazz.getName();
_parameters = null;
}
public Signature(OJField field) {
_kind = FIELD;
/*_returnType = field.getType();*/
_name = field.getName();
_parameters = null;
}
public Signature(OJMethod method) {
_kind = METHOD;
/*_returnType = method.getReturnType();*/
_name = method.getName();
_parameters = (OJClass[]) method.getParameterTypes().clone();
}
public Signature(OJConstructor constructor) {
_kind = CONSTRUCTOR;
/*_returnType = null;*/
_name = null;
_parameters = (OJClass[]) constructor.getParameterTypes().clone();
}
protected OJClass[] parameterTypes() {
return _parameters;
}
public int kind() {
return _kind;
}
/**
* Returns the <code>String</code> representation of this signature.
*
* @return the string representation of this signature.
*/
public String toString() {
if (strCache == null)
strCache = getStringValue();
return strCache;
}
private String strCache = null;
private String getStringValue() {
StringBuffer buf = new StringBuffer();
switch (kind()) {
case CLASS :
buf.append("class ");
buf.append(getName());
break;
case FIELD :
buf.append("field ");
buf.append(getName());
break;
case METHOD :
buf.append("method ");
buf.append(getName());
buf.append("(");
if (parameterTypes().length != 0) {
buf.append(parameterTypes()[0]);
}
for (int i = 1; i < parameterTypes().length; ++i) {
buf.append(",");
buf.append(parameterTypes()[i].toString());
}
buf.append(")");
break;
case CONSTRUCTOR :
buf.append("constructor ");
buf.append("(");
if (parameterTypes().length != 0) {
buf.append(parameterTypes()[0]);
}
for (int i = 1; i < parameterTypes().length; ++i) {
buf.append(",");
buf.append(parameterTypes()[i].toString());
}
buf.append(")");
break;
}
return buf.toString();
}
public int hashCode() {
if (hashCodeCache == -1)
hashCodeCache = toString().hashCode();
return hashCodeCache;
}
private int hashCodeCache = -1;
public boolean equals(Object obj) {
if (obj == null)
return false;
if (!(obj instanceof Signature))
return false;
return toString().equals(obj.toString());
}
private OJClass getReturnType() {
return _returnType;
}
public String getName() {
return _name;
}
public OJClass[] getParameterTypes() {
if (parameterTypes() == null)
return null;
return (OJClass[]) parameterTypes().clone();
}
public boolean equals(Signature sign) {
if (sign == null)
return false;
if (this.kind() != sign.kind())
return false;
switch (kind()) {
case CLASS :
return false;
case FIELD :
return false;
case METHOD :
return false;
case CONSTRUCTOR :
return compareParams(sign.parameterTypes());
}
return false;
}
public boolean strictlyEquals(Signature sign) {
/*********/
if (this == sign)
return true;
return false;
}
private final boolean compareParams(OJClass[] params) {
if (params == null)
return false;
if (parameterTypes().length != params.length)
return false;
for (int i = 0; i < params.length; ++i) {
if (parameterTypes()[i] != params[i])
return false;
}
return true;
}
public boolean isClass() {
return (kind() == CLASS);
}
public boolean isConstructor() {
return (kind() == CONSTRUCTOR);
}
public boolean isField() {
return (kind() == FIELD);
}
public boolean isMethod() {
return (kind() == METHOD);
}
public static OJClass commonBaseType(OJClass a, OJClass b) {
if (a.isAssignableFrom(b))
return a;
if (b.isAssignableFrom(a))
return b;
return commonBaseType(a.getSuperclass(), b.getSuperclass());
}
public static OJClass[] commonBaseTypes(OJClass[] a, OJClass b[]) {
OJClass[] result = new OJClass[a.length];
for (int i = 0; i < a.length; ++i) {
result[i] = commonBaseType(a[i], b[i]);
}
return result;
}
}
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