Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/*
* Copyright (c) 2020, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
* copyright rights in the Software, and any and all patent rights owned or
* freely licensable by each licensor hereunder covering either (i) the
* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
*
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
* is contributed by such licensors),
*
* without restriction, including without limitation the rights to copy, create
* derivative works of, display, perform, and distribute the Software and make,
* use, sell, offer for sale, import, export, have made, and have sold the
* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
*
* The above copyright notice and either this complete permission notice or at a
* minimum a reference to the UPL must be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.graalvm.polyglot.proxy;
import org.graalvm.polyglot.Value;
import java.util.ConcurrentModificationException;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Objects;
/**
* Interface to be implemented to mimic guest language iterators.
*
* @see Proxy
* @see ProxyIterable
* @since 21.1
*/
public interface ProxyIterator extends Proxy {
/**
* Returns true if the iterator has more elements, else false.
* Multiple calls to the {@link #hasNext()} might lead to different results if the underlying
* data structure is modified.
*
* @see #getNext()
* @since 21.1
*/
boolean hasNext();
/**
* Returns the next element in the iteration. When the underlying data structure is modified the
* {@link #getNext()} may throw the {@link NoSuchElementException} even when the
* {@link #hasNext()} returned {@code true}.
*
* @throws NoSuchElementException if the iteration has no more elements, the {@link #hasNext()}
* returns false.
* @throws UnsupportedOperationException when the underlying iterator element exists but is not
* readable.
*
* @see #hasNext()
* @since 21.1
*/
Object getNext() throws NoSuchElementException, UnsupportedOperationException;
/**
* Creates a proxy iterator backed by a Java {@link Iterator}. If the set values are host values
* then they will be {@link Value#asHostObject() unboxed}. If the Java {@link Iterator} throws
* the {@link ConcurrentModificationException} the exception is translated into the host
* exception.
*
* @since 21.1
*/
static ProxyIterator from(Iterator iterator) {
Objects.requireNonNull(iterator, "Iterator must be non null.");
return new DefaultProxyIterator(iterator);
}
}
final class DefaultProxyIterator implements ProxyIterator {
private final Iterator iterator;
DefaultProxyIterator(Iterator iterator) {
this.iterator = iterator;
}
@Override
public boolean hasNext() {
return iterator.hasNext();
}
@Override
public Object getNext() {
return iterator.next();
}
}
