com.evrythng.commons.domain.Value.java Source code

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Here is the source code for com.evrythng.commons.domain.Value.java

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/*
 * (c) Copyright Reserved EVRYTHNG Limited 2016. All rights reserved.
 * Use of this material is subject to license.
 * Copying and unauthorised use of this material strictly prohibited.
 */
package com.evrythng.commons.domain;

import com.evrythng.commons.validation.Precondition;
import com.evrythng.commons.validation.preconditions.NotNull;
import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;

import static com.evrythng.commons.validation.EnsureThat.ensureThat;

public abstract class Value<V> {

    private final V value;

    @SafeVarargs
    protected Value(final V value, final Precondition<V>... additionalPreconditions) {

        ensureThat(value, NotNull.<V>notNull(), additionalPreconditions);
        this.value = value;
    }

    protected final V internalValue() {

        return value;
    }

    @Override
    public final boolean equals(final Object other) {

        if (other == null || other.getClass() != getClass()) {
            return false;
        }
        Value<V> that = (Value<V>) other;
        EqualsBuilder equals = new EqualsBuilder();
        equals.append(value, that.value);
        return equals.build();
    }

    @Override
    public final int hashCode() {

        HashCodeBuilder hashCode = new HashCodeBuilder();
        hashCode.append(value);
        return hashCode.build();
    }

    @Override
    public final String toString() {

        ToStringBuilder toString = new ToStringBuilder(this, ToStringStyle.SIMPLE_STYLE);
        toString.append("value", value);
        return toString.build();
    }
}