StackRegistry.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.kie.workbench.common.stunner.core.registry.impl;

import java.util.Stack;

import org.kie.workbench.common.stunner.core.registry.DynamicRegistry;

class StackRegistry<T> implements DynamicRegistry<T> {

    private final KeyProvider<T> keyProvider;
    private final Stack<T> items;

    public StackRegistry(final KeyProvider<T> keyProvider,
                         final Stack<T> items) {
        this.keyProvider = keyProvider;
        this.items = items;
    }

    public T peek() {
        return items.peek();
    }

    public T pop() {
        return items.pop();
    }

    @Override
    public void register(final T item) {
        items.add(item);
    }

    public boolean remove(final T item) {
        return items.remove(item);
    }

    @Override
    public boolean contains(final T item) {
        return items.contains(item);
    }

    @Override
    public boolean isEmpty() {
        return items.isEmpty();
    }

    public T getItemByKey(final String id) {
        if (null != id) {
            for (final T item : items) {
                final String itemId = getItemKey(item);
                if (id.equals(itemId)) {
                    return item;
                }
            }
        }
        return null;
    }

    public int indexOf(final T item) {
        return items.indexOf(item);
    }

    private String getItemKey(final T item) {
        return keyProvider.getKey(item);
    }

    Stack<T> getStack() {
        return items;
    }
}