/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.isis.core.runtime.persistence.query;
import java.io.IOException;
import org.apache.isis.core.commons.encoding.DataInputExtended;
import org.apache.isis.core.commons.encoding.DataOutputExtended;
import org.apache.isis.core.commons.encoding.Encodable;
import org.apache.isis.core.metamodel.spec.ObjectSpecification;
import org.apache.isis.core.metamodel.specloader.SpecificationLoader;
import org.apache.isis.core.runtime.system.persistence.PersistenceQuery;
public abstract class PersistenceQueryAbstract implements PersistenceQuery, Encodable {
//region > constructor, fields
protected final long start;
protected final long count;
private final ObjectSpecification specification;
private final SpecificationLoader specificationLoader;
public PersistenceQueryAbstract(
final ObjectSpecification specification,
final SpecificationLoader specificationLoader,
final long... range) {
this.specificationLoader = specificationLoader;
this.start = range.length > 0 ? range[0]:0;
this.count = range.length > 1 ? range[1]:0;
this.specification = specification;
// nothing to do
}
protected PersistenceQueryAbstract(
final DataInputExtended input,
final SpecificationLoader specificationLoader,
final long... range) throws IOException {
this.specificationLoader = specificationLoader;
final String specName = input.readUTF();
this.start = range.length > 0 ? range[0]:0;
this.count = range.length > 1 ? range[1]:0;
specification = specificationLoader.loadSpecification(specName);
// nothing to do
}
//endregion
@Override
public void encode(final DataOutputExtended output) throws IOException {
output.writeUTF(specification.getFullIdentifier());
}
/**
* The start index into the set table
* @return
*/
public long getStart() {
return start;
}
/**
* The number of items to return, starting at {@link #getStart()}
*/
public long getCount() {
return count;
}
@Override
public ObjectSpecification getSpecification() {
return specification;
}
//region > equals, hashCode
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final PersistenceQueryAbstract other = (PersistenceQueryAbstract) obj;
if (specification == null) {
if (other.specification != null) {
return false;
}
} else if (!specification.equals(other.specification)) {
return false;
}
return true;
}
@Override
public int hashCode() {
final int PRIME = 31;
int result = 1;
result = PRIME * result + 1231;
result = PRIME * result + ((specification == null) ? 0 : specification.hashCode());
return result;
}
//endregion
}