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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.sshd.common.util;

import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.Objects;
import java.util.Set;

/**
 * A dummy map that ignores all {@code put/remove} calls
 *
 * @param   Key type
 * @param   Value type
 * @author     Apache MINA SSHD Project
 */
public class IgnoringEmptyMap implements Map {
    @SuppressWarnings("rawtypes")
    private static final IgnoringEmptyMap INSTANCE = new IgnoringEmptyMap();

    public IgnoringEmptyMap() {
        super();
    }

    @Override
    public int size() {
        return 0;
    }

    @Override
    public boolean isEmpty() {
        return true;
    }

    @Override
    public boolean containsValue(Object value) {
        Objects.requireNonNull(value, "No value provided");
        return false;
    }

    @Override
    public boolean containsKey(Object key) {
        Objects.requireNonNull(key, "No key provided");
        return false;
    }

    @Override
    public V get(Object key) {
        Objects.requireNonNull(key, "No key provided");
        return null;
    }

    @Override
    public V put(K key, V value) {
        Objects.requireNonNull(key, "No key provided");
        Objects.requireNonNull(value, "No value provided");
        return null;
    }

    @Override
    public V remove(Object key) {
        Objects.requireNonNull(key, "No key provided");
        return null;
    }

    @Override
    public void putAll(Map m) {
        // ignored
    }

    @Override
    public void clear() {
        // ignored
    }

    @Override
    public Set keySet() {
        return Collections.emptySet();
    }

    @Override
    public Collection values() {
        return Collections.emptyList();
    }

    @Override
    public boolean equals(Object o) {
        return o instanceof IgnoringEmptyMap;
    }

    @Override
    public int hashCode() {
        return 0;
    }

    @Override
    public String toString() {
        return "{}";
    }

    @Override
    public Set> entrySet() {
        return Collections.emptySet();
    }

    @SuppressWarnings("unchecked")
    public static  IgnoringEmptyMap getInstance() {
        return INSTANCE;
    }
}