com.gs.obevo.util.hash.CompoundHashingStrategy Maven / Gradle / Ivy
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/**
* Copyright 2017 Goldman Sachs.
* 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 com.gs.obevo.util.hash;
import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.eclipse.collections.api.block.HashingStrategy;
import org.eclipse.collections.api.block.function.Function;
import org.eclipse.collections.api.block.procedure.Procedure;
import org.eclipse.collections.api.list.ImmutableList;
class CompoundHashingStrategy implements HashingStrategy {
private final ImmutableList> keyAttrs;
CompoundHashingStrategy(ImmutableList extends Function> keyAttrs) {
this.keyAttrs = (ImmutableList>) keyAttrs;
}
public int computeHashCode(final T object) {
final HashCodeBuilder hash = new HashCodeBuilder(17, 37);
this.keyAttrs.forEach(new Procedure>() {
@Override
public void value(Function attr) {
hash.append(attr.valueOf(object));
}
});
return hash.toHashCode();
}
public boolean equals(final T object1, final T object2) {
final EqualsBuilder equals = new EqualsBuilder();
this.keyAttrs.forEach(new Procedure>() {
@Override
public void value(Function attr) {
equals.append(attr.valueOf(object1), attr.valueOf(object2));
}
});
return equals.isEquals();
}
}
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