net.femtoparsec.remote.impl.DefaultViewDifference.java Source code

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Here is the source code for net.femtoparsec.remote.impl.DefaultViewDifference.java

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/*
 * Copyright (c) 2014, Bastien Aracil
 * All rights reserved.
 * New BSD license. See http://en.wikipedia.org/wiki/Bsd_license
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *    * The name of Bastien Aracil may not be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL BASTIEN ARACIL BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package net.femtoparsec.remote.impl;

import com.google.common.collect.ImmutableSet;
import net.femtoparsec.remote.Address;
import net.femtoparsec.remote.ViewDifference;
import net.femtoparsec.remote.View;

/**
 * Contains the differences between two views
 *
 * @author Bastien Aracil
 * @version 29/04/2014 - 16:05:46
 */
public class DefaultViewDifference implements ViewDifference {

    private final View firstView;
    private final View secondView;

    private final ImmutableSet<Address> newMembers;
    private final ImmutableSet<Address> leftMembers;
    private final ImmutableSet<Address> unchangedMembers;

    private final boolean sameMembers;

    DefaultViewDifference(View firstView, View secondView, ImmutableSet<Address> newMembers,
            ImmutableSet<Address> leftMembers, ImmutableSet<Address> unchangedMembers) {
        this.firstView = firstView;
        this.secondView = secondView;
        this.newMembers = newMembers;
        this.leftMembers = leftMembers;
        this.unchangedMembers = unchangedMembers;
        this.sameMembers = newMembers.isEmpty() && leftMembers.isEmpty();
    }

    @Override
    public ImmutableSet<Address> getNewMembers() {
        return this.newMembers;
    }

    @Override
    public ImmutableSet<Address> getLeftMembers() {
        return this.leftMembers;
    }

    @Override
    public ImmutableSet<Address> getUnchangedMembers() {
        return this.unchangedMembers;
    }

    @Override
    public View getFirstView() {
        return firstView;
    }

    @Override
    public View getSecondView() {
        return secondView;
    }

    @Override
    public boolean areIdentical() {
        return sameMembers;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("RemoteViewDifference{firstView=").append(firstView).append(", secondView=").append(secondView)
                .append(", sameMembers=").append(sameMembers);
        if (!sameMembers) {
            if (!unchangedMembers.isEmpty()) {
                sb.append(", unchanged=").append(unchangedMembers);
            }
            if (!newMembers.isEmpty()) {
                sb.append(", new=").append(newMembers);
            }
            if (!leftMembers.isEmpty()) {
                sb.append(", left=").append(leftMembers);
            }
        }
        sb.append("}");
        return sb.toString();
    }

    public static Builder builder() {
        return new Builder();
    }

    public static class Builder {
        private View from;
        private View to;
        private ImmutableSet<Address> newMembers;
        private ImmutableSet<Address> leftMembers;
        private ImmutableSet<Address> unchangedMembers;

        public Builder setFrom(View from) {
            this.from = from;
            return this;
        }

        public Builder setTo(View to) {
            this.to = to;
            return this;
        }

        public Builder setNewMembers(ImmutableSet<Address> newMembers) {
            this.newMembers = newMembers;
            return this;
        }

        public Builder setLeftMembers(ImmutableSet<Address> leftMembers) {
            this.leftMembers = leftMembers;
            return this;
        }

        public Builder setUnchangedMembers(ImmutableSet<Address> unchangedMembers) {
            this.unchangedMembers = unchangedMembers;
            return this;
        }

        public DefaultViewDifference build() {
            return new DefaultViewDifference(from, to, newMembers, leftMembers, unchangedMembers);
        }
    }
}