- GraalVM Development (Oracle Corporation)
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package org.graalvm.polyglot.proxy;
import java.util.List;
import org.graalvm.polyglot.Value;
Interface to be implemented to mimic guest language arrays. Arrays are always interpreted as
zero-based arrays, independent of whether the Graal language uses one-based arrays. For example
an access to array index one in a language with one-based arrays will access the proxy array at
index zero.
See Also: - Proxy
Since: 19.0
/**
* Interface to be implemented to mimic guest language arrays. Arrays are always interpreted as
* zero-based arrays, independent of whether the Graal language uses one-based arrays. For example
* an access to array index one in a language with one-based arrays will access the proxy array at
* index zero.
*
* @see Proxy
* @since 19.0
*/
public interface ProxyArray extends Proxy {
Returns the element at the given index.
Throws: - ArrayIndexOutOfBoundsException – if the index is out of bounds
- UnsupportedOperationException – if the operation is not supported
Since: 19.0
/**
* Returns the element at the given index.
*
* @throws ArrayIndexOutOfBoundsException if the index is out of bounds
* @throws UnsupportedOperationException if the operation is not supported
* @since 19.0
*/
Object get(long index);
Sets the element at the given index.
Throws: - ArrayIndexOutOfBoundsException – if the index is out of bounds
- UnsupportedOperationException – if the operation is not supported
Since: 19.0
/**
* Sets the element at the given index.
*
* @throws ArrayIndexOutOfBoundsException if the index is out of bounds
* @throws UnsupportedOperationException if the operation is not supported
* @since 19.0
*/
void set(long index, Value value);
Removes the element at the given index.
Throws: - ArrayIndexOutOfBoundsException – if the index is out of bounds
- UnsupportedOperationException – if the operation is not supported
Returns: true when the element was removed, false when the element
didn't exist.Since: 19.0
/**
* Removes the element at the given index.
*
* @return <code>true</code> when the element was removed, <code>false</code> when the element
* didn't exist.
* @throws ArrayIndexOutOfBoundsException if the index is out of bounds
* @throws UnsupportedOperationException if the operation is not supported
* @since 19.0
*/
@SuppressWarnings("unused")
default boolean remove(long index) {
throw new UnsupportedOperationException("remove() not supported.");
}
Returns the reported size of the array. The returned size of an array does not limit a guest
language to get and set values using arbitrary indices. The array size is typically used by
Graal languages to traverse the array.
Since: 19.0
/**
* Returns the reported size of the array. The returned size of an array does not limit a guest
* language to get and set values using arbitrary indices. The array size is typically used by
* Graal languages to traverse the array.
*
* @since 19.0
*/
long getSize();
Creates a proxy array backed by a Java Object array. If the set values of the array are host values then they will be unboxed. Note this function expects a variable number of arguments of type Object, thus might not work as expected on non-Object array types. For instance, an int array will be stored as the first element of the resulting proxy array. To flatten it out, convert it to an Object array first (e.g. with Arrays.stream( myIntArray ).boxed().toArray();). Params: - values – the Object[] array or the vararg arguments to be proxied.
Since: 19.0
/**
* Creates a proxy array backed by a Java Object array. If the set values of the array are host
* values then they will be {@link Value#asHostObject() unboxed}.
*
* Note this function expects a variable number of arguments of type Object, thus might not work
* as expected on non-Object array types. For instance, an int array will be stored as the first
* element of the resulting proxy array. To flatten it out, convert it to an Object array first
* (e.g. with {@code Arrays.stream( myIntArray ).boxed().toArray();}).
*
* @param values the Object[] array or the vararg arguments to be proxied.
*
* @since 19.0
*/
static ProxyArray fromArray(Object... values) {
return new ProxyArray() {
public Object get(long index) {
checkIndex(index);
return values[(int) index];
}
public void set(long index, Value value) {
checkIndex(index);
values[(int) index] = value.isHostObject() ? value.asHostObject() : value;
}
private void checkIndex(long index) {
if (index > Integer.MAX_VALUE || index < 0) {
throw new ArrayIndexOutOfBoundsException("invalid index.");
}
}
public long getSize() {
return values.length;
}
};
}
Creates a proxy array backed by a Java List. If the set values of the list are host values then the they will be unboxed. Since: 19.0
/**
* Creates a proxy array backed by a Java List. If the set values of the list are host values
* then the they will be {@link Value#asHostObject() unboxed}.
*
* @since 19.0
*/
static ProxyArray fromList(List<Object> values) {
return new ProxyArray() {
@Override
public Object get(long index) {
checkIndex(index);
return values.get((int) index);
}
@Override
public void set(long index, Value value) {
checkIndex(index);
values.set((int) index, value.isHostObject() ? value.asHostObject() : value);
}
@Override
public boolean remove(long index) {
checkIndex(index);
values.remove((int) index);
return true;
}
private void checkIndex(long index) {
if (index > Integer.MAX_VALUE || index < 0) {
throw new ArrayIndexOutOfBoundsException("invalid index.");
}
}
public long getSize() {
return values.size();
}
};
}
}