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Protempa Framework is the core of Protempa.
There is a newer version: 5.2-Alpha-2
package org.protempa;

/*
 * #%L
 * Protempa Framework
 * %%
 * Copyright (C) 2012 - 2015 Emory University
 * %%
 * 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.
 * #L%
 */

import java.util.Objects;
import org.apache.commons.lang3.builder.ToStringBuilder;

/**
 *
 * @author Andrew Post
 */
public final class KeySetSpec {
    public static final KeySetSpec[] EMPTY_KEY_SET_SPEC_ARRAY = new KeySetSpec[0];
    
    private final SourceSystem sourceSystem;
    private final String id;
    private final String displayName;
    private final String description;

    public KeySetSpec(SourceSystem sourceSystem, String id, String displayName, String description) {
        if (sourceSystem == null) {
            throw new IllegalArgumentException("sourceSystem cannot be null");
        }
        if (id == null) {
            throw new IllegalArgumentException("id cannot be null");
        }
        this.sourceSystem = sourceSystem;
        this.id = id;
        this.displayName = displayName;
        this.description = description;
    }

    public SourceSystem getSourceSystem() {
        return sourceSystem;
    }

    public String getId() {
        return id;
    }

    public String getDisplayName() {
        return displayName;
    }

    public String getDescription() {
        return description;
    }

    @Override
    public int hashCode() {
        int hash = 3;
        hash = 29 * hash + Objects.hashCode(this.sourceSystem);
        hash = 29 * hash + Objects.hashCode(this.id);
        hash = 29 * hash + Objects.hashCode(this.displayName);
        hash = 29 * hash + Objects.hashCode(this.description);
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final KeySetSpec other = (KeySetSpec) obj;
        if (!Objects.equals(this.sourceSystem, other.sourceSystem)) {
            return false;
        }
        if (!Objects.equals(this.id, other.id)) {
            return false;
        }
        if (!Objects.equals(this.displayName, other.displayName)) {
            return false;
        }
        if (!Objects.equals(this.description, other.description)) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return ToStringBuilder.reflectionToString(this);
    }
    
}