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/*
 *  Copyright 2001-2005 Stephen Colebourne
 *
 *  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 org.joda.time.field;

import org.joda.time.DurationField;
import org.joda.time.DurationFieldType;

/**
 * Scales a DurationField such that it's unit millis becomes larger in
 * magnitude.
 * 

* ScaledDurationField is thread-safe and immutable. * * @see PreciseDurationField * * @author Brian S O'Neill * @since 1.0 */ public class ScaledDurationField extends DecoratedDurationField { private static final long serialVersionUID = -3205227092378684157L; private final int iScalar; /** * Constructor * * @param field the field to wrap, like "year()". * @param type the type this field will actually use * @param scalar scalar, such as 100 years in a century * @throws IllegalArgumentException if scalar is zero or one. */ public ScaledDurationField(DurationField field, DurationFieldType type, int scalar) { super(field, type); if (scalar == 0 || scalar == 1) { throw new IllegalArgumentException("The scalar must not be 0 or 1"); } iScalar = scalar; } public int getValue(long duration) { return getWrappedField().getValue(duration) / iScalar; } public long getValueAsLong(long duration) { return getWrappedField().getValueAsLong(duration) / iScalar; } public int getValue(long duration, long instant) { return getWrappedField().getValue(duration, instant) / iScalar; } public long getValueAsLong(long duration, long instant) { return getWrappedField().getValueAsLong(duration, instant) / iScalar; } public long getMillis(int value) { long scaled = ((long) value) * ((long) iScalar); return getWrappedField().getMillis(scaled); } public long getMillis(long value) { long scaled = FieldUtils.safeMultiply(value, iScalar); return getWrappedField().getMillis(scaled); } public long getMillis(int value, long instant) { long scaled = ((long) value) * ((long) iScalar); return getWrappedField().getMillis(scaled, instant); } public long getMillis(long value, long instant) { long scaled = FieldUtils.safeMultiply(value, iScalar); return getWrappedField().getMillis(scaled, instant); } public long add(long instant, int value) { long scaled = ((long) value) * ((long) iScalar); return getWrappedField().add(instant, scaled); } public long add(long instant, long value) { long scaled = FieldUtils.safeMultiply(value, iScalar); return getWrappedField().add(instant, scaled); } public int getDifference(long minuendInstant, long subtrahendInstant) { return getWrappedField().getDifference(minuendInstant, subtrahendInstant) / iScalar; } public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) { return getWrappedField().getDifferenceAsLong(minuendInstant, subtrahendInstant) / iScalar; } public long getUnitMillis() { return getWrappedField().getUnitMillis() * iScalar; } //----------------------------------------------------------------------- /** * Returns the scalar applied, in the field's units. * * @return the scalar */ public int getScalar() { return iScalar; } /** * Compares this duration field to another. * Two fields are equal if of the same type and duration. * * @param obj the object to compare to * @return if equal */ public boolean equals(Object obj) { if (this == obj) { return true; } else if (obj instanceof ScaledDurationField) { ScaledDurationField other = (ScaledDurationField) obj; return (getWrappedField().equals(other.getWrappedField())) && (getType() == other.getType()) && (iScalar == other.iScalar); } return false; } /** * Gets a hash code for this instance. * * @return a suitable hashcode */ public int hashCode() { long scalar = iScalar; int hash = (int) (scalar ^ (scalar >>> 32)); hash += getType().hashCode(); hash += getWrappedField().hashCode(); return hash; } }





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