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Elide Core

There is a newer version: 7.1.4

/*
 * Copyright 2015, Yahoo Inc.
 * Licensed under the Apache License, Version 2.0
 * See LICENSE file in project root for terms.
 */
package com.yahoo.elide.core;

import com.google.common.collect.UnmodifiableIterator;

import java.util.AbstractSet;
import java.util.Iterator;
import java.util.Spliterator;
import java.util.Spliterators;

/**
 * Stream iterable list as a set of PersistentResource.
 * @param  type of resource
 */
public class PersistentResourceSet extends AbstractSet> {

    final private PersistentResource parent;
    final private String parentRelationship;
    final private Iterable list;
    final private RequestScope requestScope;

    public PersistentResourceSet(PersistentResource parent, String parentRelationship,
                                 Iterable list, RequestScope requestScope) {
        this.parent = parent;
        this.parentRelationship = parentRelationship;
        this.list = list;
        this.requestScope = requestScope;
    }

    public PersistentResourceSet(Iterable list, RequestScope requestScope) {
        this(null, null, list, requestScope);
    }

    @Override
    public Iterator> iterator() {
        final Iterator iterator = list.iterator();
        return new UnmodifiableIterator>() {
            @Override
            public boolean hasNext() {
                return iterator.hasNext();
            }

            @Override
            public PersistentResource next() {
                T obj = iterator.next();
                return new PersistentResource<>(obj, parent, parentRelationship,
                        requestScope.getUUIDFor(obj), requestScope);
            }
        };
    }

    @Override
    public int size() {
        throw new UnsupportedOperationException();
    }

    @Override
    public Spliterator> spliterator() {
        return Spliterators.spliteratorUnknownSize(iterator(), 0);
    }
}