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Bonita Common is the useful layer common to bonita-client and bonita-server
There is a newer version: 10.2.0
/**
 * Copyright (C) 2019 Bonitasoft S.A.
 * Bonitasoft, 32 rue Gustave Eiffel - 38000 Grenoble
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation
 * version 2.1 of the License.
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
 * Floor, Boston, MA 02110-1301, USA.
 **/
package org.bonitasoft.engine.bdm.model.field;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlIDREF;
import javax.xml.bind.annotation.XmlType;

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 org.bonitasoft.engine.bdm.model.BusinessObject;

/**
 * @author Colin PUY
 */
@XmlType
public class RelationField extends Field {

    // required, package-info doesn't apply to inner class
    @XmlType(namespace = "http://documentation.bonitasoft.com/bdm-xml-schema/1.0")
    public enum Type {
        AGGREGATION, COMPOSITION;
    }

    // required, package-info doesn't apply to inner class
    @XmlType(namespace = "http://documentation.bonitasoft.com/bdm-xml-schema/1.0")
    public enum FetchType {
        EAGER, LAZY
    }

    @XmlAttribute(required = true)
    private Type type;

    @XmlIDREF
    @XmlAttribute(required = true)
    private BusinessObject reference;

    @XmlAttribute(required = true)
    private FetchType fetchType = FetchType.EAGER;

    public Type getType() {
        return type;
    }

    public void setType(final Type type) {
        this.type = type;
    }

    public BusinessObject getReference() {
        return reference;
    }

    public void setReference(final BusinessObject reference) {
        this.reference = reference;
    }

    public FetchType getFetchType() {
        return fetchType;
    }

    public void setFetchType(final FetchType fetchType) {
        this.fetchType = fetchType;
    }

    public boolean isLazy() {
        return fetchType == FetchType.LAZY;
    }

    @Override
    public int hashCode() {
        HashCodeBuilder hashCodeBuilder = new HashCodeBuilder(17, 37).appendSuper(super.hashCode()).append(type);
        if (reference != null) {
            hashCodeBuilder = hashCodeBuilder.append(reference.getQualifiedName()).append(reference.getDescription());
        }
        return hashCodeBuilder.toHashCode();
    }

    @Override
    public boolean equals(final Object obj) {
        if (obj instanceof RelationField) {
            final RelationField other = (RelationField) obj;
            if (reference == null ^ other.reference == null) {
                return false;
            }
            EqualsBuilder builder = new EqualsBuilder().appendSuper(super.equals(obj)).append(type, other.type);
            if (reference != null && other.reference != null) {
                builder = builder.append(reference.getQualifiedName(), other.reference.getQualifiedName());
            }
            return builder.isEquals();
        }
        return false;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE).append("name", getName())
                .append("type", type).append("reference", reference)
                .toString();
    }

}