package org.jboss.resteasy.core.request;
import java.math.BigDecimal;
import java.math.MathContext;
/**
* A individual variant quality bean for the <span title="Remote Variant Selection Algorithm">RVSA</span>.
@see "RFC 2296"
@author Pascal S. de Kloe
*/
public class VariantQuality {
private QualityValue mediaTypeQualityValue = QualityValue.DEFAULT;
private QualityValue characterSetQualityValue = QualityValue.DEFAULT;
private QualityValue encodingQualityValue = QualityValue.DEFAULT;
private QualityValue languageQualityValue = QualityValue.DEFAULT;
public VariantQuality() {
}
public void setMediaTypeQualityValue(QualityValue value) {
if (value == null)
mediaTypeQualityValue = QualityValue.DEFAULT;
else
mediaTypeQualityValue = value;
}
public void setCharacterSetQualityValue(QualityValue value) {
if (value == null)
characterSetQualityValue = QualityValue.DEFAULT;
else
characterSetQualityValue = value;
}
public void setEncodingQualityValue(QualityValue value) {
if (value == null)
encodingQualityValue = QualityValue.DEFAULT;
else
encodingQualityValue = value;
}
public void setLanguageQualityValue(QualityValue value) {
if (value == null)
languageQualityValue = QualityValue.DEFAULT;
else
languageQualityValue = value;
}
/**
@return the quality value between zero and one with five decimal places after the point.
@see "3.3 Computing overall quality values"
*/
public BigDecimal getOverallQuality() {
BigDecimal qt = BigDecimal.valueOf(mediaTypeQualityValue.intValue(), 3);
BigDecimal qc = BigDecimal.valueOf(characterSetQualityValue.intValue(), 3);
BigDecimal qe = BigDecimal.valueOf(encodingQualityValue.intValue(), 3);
BigDecimal ql = BigDecimal.valueOf(languageQualityValue.intValue(), 3);
assert qt.compareTo(BigDecimal.ZERO) >= 0 && qt.compareTo(BigDecimal.ONE) <= 0;
assert qc.compareTo(BigDecimal.ZERO) >= 0 && qc.compareTo(BigDecimal.ONE) <= 0;
assert qe.compareTo(BigDecimal.ZERO) >= 0 && qe.compareTo(BigDecimal.ONE) <= 0;
assert ql.compareTo(BigDecimal.ZERO) >= 0 && ql.compareTo(BigDecimal.ONE) <= 0;
BigDecimal result = qt;
result = result.multiply(qc, MathContext.DECIMAL32);
result = result.multiply(qe, MathContext.DECIMAL32);
result = result.multiply(ql, MathContext.DECIMAL32);
assert result.compareTo(BigDecimal.ZERO) >= 0 && result.compareTo(BigDecimal.ONE) <= 0;
long round5 = result.scaleByPowerOfTen(5).longValue();
result = BigDecimal.valueOf(round5, 5);
assert result.compareTo(BigDecimal.ZERO) >= 0 && result.compareTo(BigDecimal.ONE) <= 0;
return result;
}
}