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/*
* 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.
*/
/* $Id$ */
package org.apache.fop.fo.properties;
import org.apache.fop.datatypes.PercentBaseContext;
/**
* An absolute length quantity in XSL
*/
public final class FixedLength extends LengthProperty {
/** Describes the unit pica. */
public static final String PICA = "pc";
/** Describes the unit point. */
public static final String POINT = "pt";
/** Describes the unit millimeter. */
public static final String MM = "mm";
/** Describes the unit centimeter. */
public static final String CM = "cm";
/** Describes the unit inch. */
public static final String INCH = "in";
/** Describes the unit millipoint. */
public static final String MPT = "mpt";
/** cache holding all canonical FixedLength instances */
private static final PropertyCache<FixedLength> CACHE = new PropertyCache<FixedLength>();
/** canonical zero-length instance */
public static final FixedLength ZERO_FIXED_LENGTH = new FixedLength(0, FixedLength.MPT, 1.0f);
private int millipoints;
/**
* Set the length given a number of units, a unit name and
* an assumed resolution (used in case the units are pixels)
*
* @param numUnits quantity of input units
* @param units input unit specifier
* @param res input/source resolution
*/
private FixedLength(double numUnits, String units, float res) {
this.millipoints = convert(numUnits, units, res);
}
/**
* Return the cached {@link FixedLength} instance corresponding
* to the computed value in base-units (millipoints).
*
* @param numUnits quantity of input units
* @param units input unit specifier
* @param sourceResolution input/source resolution (= ratio of pixels per pt)
* @return the canonical FixedLength instance corresponding
* to the given number of units and unit specifier
* in the given resolution
*/
public static FixedLength getInstance(double numUnits,
String units,
float sourceResolution) {
if (numUnits == 0.0) {
return ZERO_FIXED_LENGTH;
} else {
return CACHE.fetch(new FixedLength(numUnits, units, sourceResolution));
}
}
/**
* Return the cached {@link FixedLength} instance corresponding
* to the computed value
* This method assumes a source-resolution of 1 (1px = 1pt)
*
* @param numUnits input units
* @param units unit specifier
* @return the canonical FixedLength instance corresponding
* to the given number of units and unit specifier
*/
public static FixedLength getInstance(double numUnits,
String units) {
return getInstance(numUnits, units, 1.0f);
}
/**
* Return the cached {@link FixedLength} instance corresponding
* to the computed value.
* This method assumes 'millipoints' (non-standard) as units,
* and an implied source-resolution of 1 (1px = 1pt).
*
* @param numUnits input units
* @return the canonical FixedLength instance corresponding
* to the given number of units and unit specifier
*/
public static FixedLength getInstance(double numUnits) {
return getInstance(numUnits, FixedLength.MPT, 1.0f);
}
/**
* Convert the given length to a dimensionless integer representing
* a whole number of base units (milli-points).
*
* @param dvalue quantity of input units
* @param unit input unit specifier (in, cm, etc.)
* @param res the input/source resolution (in case the unit spec is "px")
*/
private static int convert(double dvalue, String unit, float res) {
// TODO: Maybe this method has a better place in org.apache.fop.util.UnitConv?.
if ("px".equals(unit)) {
//device-dependent units, take the resolution into account
dvalue *= (res * 1000);
} else {
if (FixedLength.INCH.equals(unit)) {
dvalue *= 72000;
} else if (FixedLength.CM.equals(unit)) {
dvalue *= 28346.4567;
} else if (FixedLength.MM.equals(unit)) {
dvalue *= 2834.64567;
} else if (FixedLength.POINT.equals(unit)) {
dvalue *= 1000;
} else if (FixedLength.PICA.equals(unit)) {
dvalue *= 12000;
} else if (!FixedLength.MPT.equals(unit)) {
dvalue = 0;
log.error("Unknown length unit '" + unit + "'");
}
}
return (int)dvalue;
}
/** {@inheritDoc} */
public int getValue() {
return millipoints;
}
/** {@inheritDoc} */
public int getValue(PercentBaseContext context) {
return millipoints;
}
/** {@inheritDoc} */
public double getNumericValue() {
return millipoints;
}
/** {@inheritDoc} */
public double getNumericValue(PercentBaseContext context) {
return millipoints;
}
/**
* Return true since a FixedLength is always absolute.
* {@inheritDoc}
*/
public boolean isAbsolute() {
return true;
}
/** {@inheritDoc} */
public String toString() {
return millipoints + FixedLength.MPT;
}
/** {@inheritDoc} */
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof FixedLength) {
return (((FixedLength)obj).millipoints == this.millipoints);
}
return false;
}
/** {@inheritDoc} */
public int hashCode() {
return millipoints;
}
}
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