org.jclouds.atmos.domain.internal.BoundedLinkedHashSet.java Source code

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Here is the source code for org.jclouds.atmos.domain.internal.BoundedLinkedHashSet.java

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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.jclouds.atmos.domain.internal;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.LinkedHashSet;

import org.jclouds.atmos.domain.BoundedSet;
import org.jclouds.javax.annotation.Nullable;

import com.google.common.collect.Iterables;

/**
 * 
 * @author Adrian Cole
 * 
 */
public class BoundedLinkedHashSet<T> extends LinkedHashSet<T> implements BoundedSet<T> {

    protected final String token;

    public BoundedLinkedHashSet(Iterable<T> contents, @Nullable String token) {
        Iterables.addAll(this, checkNotNull(contents, "contents"));
        this.token = token;
    }

    @Nullable
    public String getToken() {
        return token;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = super.hashCode();
        result = prime * result + ((token == null) ? 0 : token.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (!super.equals(obj))
            return false;
        if (getClass() != obj.getClass())
            return false;
        BoundedLinkedHashSet<?> other = (BoundedLinkedHashSet<?>) obj;
        if (token == null) {
            if (other.token != null)
                return false;
        } else if (!token.equals(other.token))
            return false;
        return true;
    }

    @Override
    public String toString() {
        return "[token=" + token + ", contents=" + super.toString() + "]";
    }

}