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EntityIdValueImpl.java
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EntityIdValueImpl.java
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package org.wikidata.wdtk.datamodel.implementation;
/*
* #%L
* Wikidata Toolkit Data Model
* %%
* Copyright (C) 2014 Wikidata Toolkit Developers
* %%
* 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 org.apache.commons.lang3.Validate;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.wikidata.wdtk.datamodel.interfaces.EntityIdValue;
/**
* Generic implementation of {@link EntityIdValue} that works with arbitrary
* Wikibase instances: it requires a baseIri that identifies the site globally.
*
* TODO It would be cleaner to have an object that manages the site context
* instead of passing a base IRI string that is simply concatenated.
*
* TODO For our common use case that Wikidata entities are processed, it might
* be useful to have a more lightweight object that does not store this known
* base IRI.
*
* @author Markus Kroetzsch
*
*/
public abstract class EntityIdValueImpl implements EntityIdValue {
final String id;
final String baseIri;
/**
* Constructor.
*
* @param id
* the ID string, e.g., "Q1234". The required format depends on
* the specific type of entity
* @param baseIri
* the first part of the entity IRI of the site this belongs to,
* e.g., "http://www.wikidata.org/entity/"
*/
EntityIdValueImpl(String id, String baseIri) {
Validate.notNull(id, "Entity ids cannot be null");
Validate.notNull(baseIri, "Entity base IRIs cannot be null");
this.id = id;
this.baseIri = baseIri;
}
@Override
public String getIri() {
return baseIri.concat(id);
}
@Override
public String getId() {
return id;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return new HashCodeBuilder(773, 241).append(baseIri).append(id)
.toHashCode();
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (obj == this) {
return true;
}
if (!(obj instanceof EntityIdValueImpl)) {
return false;
}
EntityIdValueImpl other = (EntityIdValueImpl) obj;
return id.equals(other.id) && baseIri.equals(other.baseIri);
}
}