pl.softech.eav.domain.value.AbstractValue.java Source code

Introduction

Here is the source code for pl.softech.eav.domain.value.AbstractValue.java

Source

/*
 * Copyright 2013 Sawomir led <slawomir.sledz@sof-tech.pl>.
 *
 * 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 pl.softech.eav.domain.value;

import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;

/**
 * @author Sawomir led <slawomir.sledz@sof-tech.pl>
 * @since 1.0
 */
public abstract class AbstractValue<T> {

    public abstract T getValue();

    public String asString() {
        return isSet() ? getValue().toString() : "null";
    }

    public boolean isSet() {
        return getValue() != null;
    };

    public abstract void accept(ValueVisitor visitor);

    @Override
    public String toString() {
        ToStringBuilder sb = new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE);
        sb.append("value", getValue());
        return sb.toString();
    }

    @Override
    public int hashCode() {
        return 31 * 2 + (isSet() ? 0 : getValue().hashCode());
    }

    @Override
    public boolean equals(Object obj) {

        if (this == obj)
            return true;

        if (obj == null)
            return false;

        if (getClass() != obj.getClass())
            return false;

        return new EqualsBuilder().append(getValue(), ((AbstractValue<?>) obj).getValue()).isEquals();

    }

}