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/*
* ParameterSetTree.java
*
* @author Michiaki Tatsubori
* @version %VERSION% %DATE%
* @see java.lang.Object
*
* COPYRIGHT 1999 by Michiaki Tatsubori, ALL RIGHTS RESERVED.
*/
package examples.multimethod;
import java.util.*;
import java.io.*;
import openjava.mop.*;
import openjava.ptree.*;
/**
* The class <code>ParameterSetTree</code> sorts parameters set of method
* and hold it.
*
* @author Michiaki Tatsubori
* @see openjava.mop.OJMethod
*/
public class ParameterSetTree implements Cloneable
{
private OJClass[] params;
private OJMethod value = null;
private ParameterSetTree[] children = new ParameterSetTree[0];
public ParameterSetTree( OJClass[] params, OJMethod value ) {
this.params = params;
this.value = value;
}
ParameterSetTree( OJClass[] params ) {
this( params, null );
}
public OJClass[] getParameterTypes() {
OJClass[] result = new OJClass[params.length];
System.arraycopy( params, 0, result, 0, params.length );
return result;
}
public OJMethod getValue() {
return value;
}
public ParameterSetTree[] getChildren() {
if (children.length == 0) return children;
ParameterSetTree[] result = new ParameterSetTree[children.length];
System.arraycopy( children, 0, result, 0, children.length );
return result;
}
public boolean hasChildren() {
return children.length != 0;
}
public String toString() {
StringWriter str_writer = new StringWriter();
PrintWriter out = new PrintWriter( str_writer );
writeState( out );
out.flush();
return str_writer.toString();
}
public void writeState( PrintWriter out ) {
writeState( out, 0 );
}
private void writeState( PrintWriter out, int level ) {
for (int i = 0; i < level; ++i) out.print( " " );
out.print( "{ ");
out.print( params[0].getName() );
for (int i = 1; i < params.length; ++i) {
out.print( "," );
out.print( params[i].getName() );
}
out.print( " } " );
out.println( value != null );
for (int i = 0; i < children.length; ++i) {
children[i].writeState( out, level + 1 );
}
}
/* must adjust tree */
OJMethod add( OJMethod method ) {
OJClass[] params = method.getParameterTypes();
if (this.isSameAs( params )) {
/* exactly same */
OJMethod result = this.value;
this.value = method;
return result;
}
if (this.isAssignableFrom( params )) {
/* a subset of this */
for (int i = 0; i < children.length; ++i) {
if (children[i].isAssignableFrom( params )) {
/* a subset of one of children */
return children[i].add( method );
}
}
addChild( new ParameterSetTree( params, method ) );
return null;
}
/* a superset or an independent order set of this */
ParameterSetTree copy = shallowCopy();
OJClass[] common = commonBaseTypes( this.params, params );
this.params = common;
this.value = null;
if (isAssignable( params, common )) {
/* a superset */
this.params = params;
this.value = method;
this.children = new ParameterSetTree[]{ copy };
} else {
/* a subset of the common superset */
this.params = common;
this.value = null;
this.children = new ParameterSetTree[]{
copy,
new ParameterSetTree( params, method ) };
}
return null;
}
private ParameterSetTree shallowCopy() {
try {
return (ParameterSetTree) clone();
} catch ( CloneNotSupportedException e ){
e.printStackTrace();
return null;
}
}
/**
* Childrens must not have any smaller common set than this set.
*/
private void addChild( ParameterSetTree newbie ) {
int tobelong = 0;
OJClass[] subcommon = null;
for (; tobelong < children.length; ++tobelong) {
subcommon = commonBaseTypes( newbie.params,
children[tobelong].params );
if (! isSameAs( subcommon )) break;
}
if (tobelong == children.length) {
/* simply add */
ParameterSetTree[] result
= new ParameterSetTree[children.length + 1];
System.arraycopy( children, 0, result, 0, children.length );
result[children.length] = newbie;
children = result;
return;
}
/* at least two has a sub common signature */
if (children[tobelong].isSameAs( subcommon )) {
/* newbie is a subset */
children[tobelong].addChild( newbie );
} else {
ParameterSetTree common_set = new ParameterSetTree( subcommon );
common_set.addChild( children[tobelong] );
common_set.addChild( newbie );
children[tobelong] = common_set;
}
}
public boolean isAssignableFrom( OJClass[] params ) {
return isAssignable( this.params, params );
}
public boolean isSameAs( OJClass[] params ) {
if (this.params.length != params.length) return false;
for (int i = 0; i < this.params.length; ++i) {
if (this.params[i] != params[i]) return false;
}
return true;
}
private static boolean isAssignable( OJClass[] p1, OJClass[] p2 ) {
if (p1.length != p2.length) return false;
for (int i = 0; i < p1.length; ++i) {
if (! p1[i].isAssignableFrom( p2[i] )) return false;
}
return true;
}
private 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;
}
/**
* this is also available in the class <code>Signature</code>
*/
private 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() );
}
}
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