io.parsingdata.metal.expression.comparison.Eq Maven / Gradle / Ivy
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/*
* Copyright 2013-2016 Netherlands Forensic Institute
*
* 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 io.parsingdata.metal.expression.comparison;
import io.parsingdata.metal.expression.value.Value;
import io.parsingdata.metal.expression.value.ValueExpression;
/**
* A {@link ComparisonExpression} that implements byte-level equality.
*
* Both values are interpreted as byte arrays. The
* {@link #compare(Value, Value)} method returns true if both
* values represent the same array. That is, if both arrays are exactly the
* same size and both arrays have the same byte value at every valid index.
*
* @see EqNum
* @see EqStr
*/
public class Eq extends ComparisonExpression {
public Eq(final ValueExpression value, final ValueExpression predicate) {
super(value, predicate);
}
@Override
public boolean compare(final Value left, final Value right) {
final byte[] leftBytes = left.getValue();
final byte[] rightBytes = right.getValue();
if (leftBytes.length != rightBytes.length) { return false; }
for (int i = 0; i < leftBytes.length; i++) {
if (leftBytes[i] != rightBytes[i]) { return false; }
}
return true;
}
}