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org.python.core.JavaProxySet Maven / Gradle / Ivy
Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
package org.python.core;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.NavigableSet;
import java.util.NoSuchElementException;
import java.util.Set;
/**
* Proxy objects implementing java.util.Set
*/
class JavaProxySet {
@Untraversable
private static class SetMethod extends PyBuiltinMethodNarrow {
protected SetMethod(String name, int numArgs) {
super(name, numArgs);
}
protected SetMethod(String name, int minArgs, int maxArgs) {
super(name, minArgs, maxArgs);
}
@SuppressWarnings("unchecked")
protected Set asSet() {
return (Set) self.getJavaProxy();
}
// Unlike list and dict, set maintains the derived type for the set
// so we replicate this behavior
protected PyObject makePySet(Set newSet) {
PyObject newPySet = self.getType().__call__();
@SuppressWarnings("unchecked")
Set jSet = ((Set) newPySet.getJavaProxy());
jSet.addAll(newSet);
return newPySet;
}
/**
* Compares this object with other to check for equality. Used to implement __eq __ and
* __ne__. May return null if the other object cannot be compared i.e. is not a Python or
* Java set.
*
* @param other The object to compare to this
* @return true is equal, false if not equal and null if we can't compare
*/
protected PyBoolean isEqual(PyObject other) {
if (isPySet(other)) {
// Being compared to a Python set
final Set otherPySet = ((BaseSet) other).getSet();
final Set selfSet = asSet();
if (selfSet.size() != otherPySet.size()) {
// Sets are different sizes therefore not equal
return Py.False;
}
// Do element by element comparison, if any elements are not contained return false
for (Object obj : selfSet) {
if (!otherPySet.contains(Py.java2py(obj))) {
return Py.False;
}
}
// All elements are equal so the sets are equal
return Py.True;
} else {
// Being compared to something that is not a Python set
final Object oj = other.getJavaProxy();
if (oj instanceof Set) {
// Being compared to Java Set convert to Python set and call recursively
final PySet otherPySet = new PySet(Py.javas2pys(((Set) oj).toArray()));
return isEqual(otherPySet);
} else {
// other is not a Python or Java set, so we don't know if
// were equal therefore return null
return null;
}
}
}
public boolean isSuperset(PyObject other) {
Set selfSet = asSet();
Object oj = other.getJavaProxy();
if (oj != null && oj instanceof Set) {
Set otherSet = (Set) oj;
return selfSet.containsAll(otherSet);
} else if (isPySet(other)) {
Set otherPySet = ((BaseSet) other).getSet();
for (PyObject pyobj : otherPySet) {
if (!selfSet.contains(pyobj.__tojava__(Object.class))) {
return false;
}
}
return true;
}
return false;
}
public boolean isSubset(PyObject other) {
Set selfSet = asSet();
Object oj = other.getJavaProxy();
if (oj != null && oj instanceof Set) {
@SuppressWarnings("unchecked")
Set otherSet = (Set) oj;
return otherSet.containsAll(selfSet);
} else if (isPySet(other)) {
Set otherPySet = ((BaseSet) other).getSet();
for (Object obj : selfSet) {
if (!otherPySet.contains(Py.java2py(obj))) {
return false;
}
}
return true;
}
return false;
}
protected Set difference(Collection other) {
Set selfSet = asSet();
Set diff = new HashSet<>(selfSet);
diff.removeAll(other);
return diff;
}
protected void differenceUpdate(Collection other) {
asSet().removeAll(other);
}
protected Set intersect(Collection[] others) {
Set selfSet = asSet();
Set intersection = new HashSet<>(selfSet);
for (Collection other : others) {
intersection.retainAll(other);
}
return intersection;
}
protected void intersectUpdate(Collection[] others) {
Set selfSet = asSet();
for (Collection other : others) {
selfSet.retainAll(other);
}
}
protected Set union(Collection other) {
Set selfSet = asSet();
Set u = new HashSet<>(selfSet);
u.addAll(other);
return u;
}
protected void update(Collection other) {
asSet().addAll(other);
}
protected Set symDiff(Collection other) {
Set selfSet = asSet();
Set symDiff = new HashSet<>(selfSet);
symDiff.addAll(other);
Set intersection = new HashSet<>(selfSet);
intersection.retainAll(other);
symDiff.removeAll(intersection);
return symDiff;
}
protected void symDiffUpdate(Collection other) {
Set selfSet = asSet();
Set intersection = new HashSet<>(selfSet);
intersection.retainAll(other);
selfSet.addAll(other);
selfSet.removeAll(intersection);
}
}
@Untraversable
private static class SetMethodVarargs extends SetMethod {
protected SetMethodVarargs(String name) {
super(name, 0, -1);
}
@Override
public PyObject __call__() {
return __call__(Py.EmptyObjects);
}
@Override
public PyObject __call__(PyObject obj) {
return __call__(new PyObject[] {obj});
}
@Override
public PyObject __call__(PyObject obj1, PyObject obj2) {
return __call__(new PyObject[] {obj1, obj2});
}
@Override
public PyObject __call__(PyObject obj1, PyObject obj2, PyObject obj3) {
return __call__(new PyObject[] {obj1, obj2, obj3});
}
@Override
public PyObject __call__(PyObject obj1, PyObject obj2, PyObject obj3, PyObject obj4) {
return __call__(new PyObject[] {obj1, obj2, obj3, obj4});
}
}
private static boolean isPySet(PyObject obj) {
PyType type = obj.getType();
return type.isSubType(PySet.TYPE) || type.isSubType(PyFrozenSet.TYPE);
}
private static Collection getJavaSet(PyObject self, String op, PyObject obj) {
Collection items;
if (isPySet(obj)) {
Set otherPySet = ((BaseSet) obj).getSet();
items = new ArrayList<>(otherPySet.size());
for (PyObject pyobj : otherPySet) {
items.add(pyobj.__tojava__(Object.class));
}
} else {
Object oj = obj.getJavaProxy();
if (oj instanceof Set) {
@SuppressWarnings("unchecked")
Set jSet = (Set) oj;
items = jSet;
} else {
throw Py.TypeError(
String.format("unsupported operand type(s) for %s: '%.200s' and '%.200s'",
op, self.getType().fastGetName(), obj.getType().fastGetName()));
}
}
return items;
}
private static Collection getJavaCollection(PyObject obj) {
Collection items;
Object oj = obj.getJavaProxy();
if (oj != null) {
if (oj instanceof Collection) {
@SuppressWarnings("unchecked")
Collection jCollection = (Collection) oj;
items = jCollection;
} else if (oj instanceof Iterable) {
items = new HashSet<>();
for (Object item : (Iterable) oj) {
items.add(item);
}
} else {
throw Py.TypeError(String.format("unsupported operand type(s): '%.200s'",
obj.getType().fastGetName()));
}
} else {
// This step verifies objects are hashable
items = new HashSet<>();
for (PyObject pyobj : obj.asIterable()) {
items.add(pyobj.__tojava__(Object.class));
}
}
return items;
}
private static Collection[] getJavaCollections(PyObject[] objs) {
Collection[] collections = new Collection[objs.length];
int i = 0;
for (PyObject obj : objs) {
collections[i++] = getJavaCollection(obj);
}
return collections;
}
private static Collection getCombinedJavaCollections(PyObject[] objs) {
if (objs.length == 0) {
return Collections.emptyList();
}
if (objs.length == 1) {
return getJavaCollection(objs[0]);
}
Set items = new HashSet<>();
for (PyObject obj : objs) {
Object oj = obj.getJavaProxy();
if (oj != null) {
if (oj instanceof Iterable) {
for (Object item : (Iterable) oj) {
items.add(item);
}
} else {
throw Py.TypeError(String.format("unsupported operand type(s): '%.200s'",
obj.getType().fastGetName()));
}
} else {
for (PyObject pyobj : obj.asIterable()) {
items.add(pyobj.__tojava__(Object.class));
}
}
}
return items;
}
private static final SetMethod cmpProxy = new SetMethod("__cmp__", 1) {
@Override
public PyObject __call__(PyObject value) {
throw Py.TypeError("cannot compare sets using cmp()");
}
};
private static final SetMethod eqProxy = new SetMethod("__eq__", 1) {
@Override
public PyObject __call__(PyObject other) {
return isEqual(other);
}
};
private static final SetMethod neProxy = new SetMethod("__ne__", 1) {
@Override
public PyObject __call__(PyObject other) {
// isEqual may return null if we don't know how to compare to other.
PyBoolean equal = isEqual(other);
if (equal != null) {
// implement NOT equal by the inverse of equal
return isEqual(other).__not__();
}
return null;
}
};
private static final SetMethod ltProxy = new SetMethod("__lt__", 1) {
@Override
public PyObject __call__(PyObject other) {
return isEqual(other).__not__().__and__(Py.newBoolean(isSubset(other)));
}
};
@Untraversable
private static class IsSubsetMethod extends SetMethod {
// __le__, issubset
protected IsSubsetMethod(String name) {
super(name, 1);
}
@Override
public PyObject __call__(PyObject other) {
return Py.newBoolean(isSubset(other));
}
}
@Untraversable
private static class IsSupersetMethod extends SetMethod {
// __ge__, issuperset
protected IsSupersetMethod(String name) {
super(name, 1);
}
@Override
public PyObject __call__(PyObject other) {
return Py.newBoolean(isSuperset(other));
}
}
private static final SetMethod gtProxy = new SetMethod("__gt__", 1) {
@Override
public PyObject __call__(PyObject other) {
return isEqual(other).__not__().__and__(Py.newBoolean(isSuperset(other)));
}
};
private static final SetMethod isDisjointProxy = new SetMethod("isdisjoint", 1) {
@Override
public PyObject __call__(PyObject other) {
Collection[] otherJava = new Collection[] {getJavaCollection(other)};
return Py.newBoolean(intersect(otherJava).size() == 0);
}
};
private static final SetMethod differenceProxy = new SetMethodVarargs("difference") {
@Override
public PyObject __call__(PyObject[] others) {
return makePySet(difference(getCombinedJavaCollections(others)));
}
};
private static final SetMethod differenceUpdateProxy =
new SetMethodVarargs("difference_update") {
@Override
public PyObject __call__(PyObject[] others) {
differenceUpdate(getCombinedJavaCollections(others));
return Py.None;
}
};
private static final SetMethod subProxy = new SetMethod("__sub__", 1) {
@Override
public PyObject __call__(PyObject other) {
return makePySet(difference(getJavaSet(self, "-", other)));
}
};
private static final SetMethod isubProxy = new SetMethod("__isub__", 1) {
@Override
public PyObject __call__(PyObject other) {
differenceUpdate(getJavaSet(self, "-=", other));
return self;
}
};
private static final SetMethod intersectionProxy = new SetMethodVarargs("intersection") {
@Override
public PyObject __call__(PyObject[] others) {
return makePySet(intersect(getJavaCollections(others)));
}
};
private static final SetMethod intersectionUpdateProxy =
new SetMethodVarargs("intersection_update") {
@Override
public PyObject __call__(PyObject[] others) {
intersectUpdate(getJavaCollections(others));
return Py.None;
}
};
private static final SetMethod andProxy = new SetMethod("__and__", 1) {
@Override
public PyObject __call__(PyObject other) {
return makePySet(intersect(new Collection[] {getJavaSet(self, "&", other)}));
}
};
private static final SetMethod iandProxy = new SetMethod("__iand__", 1) {
@Override
public PyObject __call__(PyObject other) {
intersectUpdate(new Collection[] {getJavaSet(self, "&=", other)});
return self;
}
};
private static final SetMethod symDiffProxy = new SetMethod("symmetric_difference", 1) {
@Override
public PyObject __call__(PyObject other) {
return makePySet(symDiff(getJavaCollection(other)));
}
};
private static final SetMethod symDiffUpdateProxy =
new SetMethod("symmetric_difference_update", 1) {
@Override
public PyObject __call__(PyObject other) {
symDiffUpdate(getJavaCollection(other));
return Py.None;
}
};
private static final SetMethod xorProxy = new SetMethod("__xor__", 1) {
@Override
public PyObject __call__(PyObject other) {
return makePySet(symDiff(getJavaSet(self, "^", other)));
}
};
private static final SetMethod ixorProxy = new SetMethod("__ixor__", 1) {
@Override
public PyObject __call__(PyObject other) {
symDiffUpdate(getJavaSet(self, "^=", other));
return self;
}
};
private static final SetMethod unionProxy = new SetMethodVarargs("union") {
@Override
public PyObject __call__(PyObject[] others) {
return makePySet(union(getCombinedJavaCollections(others)));
}
};
private static final SetMethod updateProxy = new SetMethodVarargs("update") {
@Override
public PyObject __call__(PyObject[] others) {
update(getCombinedJavaCollections(others));
return Py.None;
}
};
private static final SetMethod orProxy = new SetMethod("__or__", 1) {
@Override
public PyObject __call__(PyObject other) {
return makePySet(union(getJavaSet(self, "|", other)));
}
};
private static final SetMethod iorProxy = new SetMethod("__ior__", 1) {
@Override
public PyObject __call__(PyObject other) {
update(getJavaSet(self, "|=", other));
return self;
}
};
@Untraversable
private static class CopyMethod extends SetMethod {
protected CopyMethod(String name) {
super(name, 0);
}
@Override
public PyObject __call__() {
return makePySet(asSet());
}
}
private static final SetMethod deepcopyOverrideProxy = new SetMethod("__deepcopy__", 1) {
@Override
public PyObject __call__(PyObject memo) {
Set newSet = new HashSet<>();
for (Object obj : asSet()) {
PyObject pyobj = Py.java2py(obj);
PyObject newobj = pyobj.invoke("__deepcopy__", memo);
newSet.add(newobj.__tojava__(Object.class));
}
return makePySet(newSet);
}
};
private static final SetMethod reduceProxy = new SetMethod("__reduce__", 0) {
@Override
public PyObject __call__() {
PyObject args = new PyTuple(new PyList(new JavaIterator(asSet())));
PyObject dict = __findattr__("__dict__");
if (dict == null) {
dict = Py.None;
}
return new PyTuple(self.getType(), args, dict);
}
};
private static final SetMethod containsProxy = new SetMethod("__contains__", 1) {
@Override
public PyObject __call__(PyObject value) {
return Py.newBoolean(asSet().contains(value.__tojava__(Object.class)));
}
};
private static final SetMethod hashProxy = new SetMethod("__hash__", 0) {
// in general, we don't know if this is really true or not
@Override
public PyObject __call__(PyObject value) {
throw Py.TypeError(
String.format("unhashable type: '%.200s'", self.getType().fastGetName()));
}
};
private static final SetMethod discardProxy = new SetMethod("discard", 1) {
@Override
public PyObject __call__(PyObject value) {
asSet().remove(value.__tojava__(Object.class));
return Py.None;
}
};
private static final SetMethod popProxy = new SetMethod("pop", 0) {
@Override
public PyObject __call__() {
Set selfSet = asSet();
Iterator it;
if (selfSet instanceof NavigableSet) {
it = ((NavigableSet) selfSet).descendingIterator();
} else {
it = selfSet.iterator();
}
try {
PyObject value = Py.java2py(it.next());
it.remove();
return value;
} catch (NoSuchElementException ex) {
throw Py.KeyError("pop from an empty set");
}
}
};
private static final SetMethod removeOverrideProxy = new SetMethod("remove", 1) {
@Override
public PyObject __call__(PyObject value) {
boolean removed = asSet().remove(value.__tojava__(Object.class));
if (!removed) {
throw Py.KeyError(value);
}
return Py.None;
}
};
static PyBuiltinMethod[] getProxyMethods() {
//@formatter:off
return new PyBuiltinMethod[]{
cmpProxy,
eqProxy,
neProxy,
ltProxy,
new IsSubsetMethod("__le__"),
new IsSubsetMethod("issubset"),
new IsSupersetMethod("__ge__"),
new IsSupersetMethod("issuperset"),
gtProxy,
isDisjointProxy,
differenceProxy,
differenceUpdateProxy,
subProxy,
isubProxy,
intersectionProxy,
intersectionUpdateProxy,
andProxy,
iandProxy,
symDiffProxy,
symDiffUpdateProxy,
xorProxy,
ixorProxy,
unionProxy,
updateProxy,
orProxy,
iorProxy,
new CopyMethod("copy"),
new CopyMethod("__copy__"),
reduceProxy,
containsProxy,
hashProxy,
discardProxy,
popProxy
};
//@formatter:on
}
static PyBuiltinMethod[] getPostProxyMethods() {
//@formatter:off
return new PyBuiltinMethod[]{
deepcopyOverrideProxy,
removeOverrideProxy
};
//@formatter:on
}
}
