org.apache.fop.fo.properties.LengthProperty Maven / Gradle / Ivy

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Tool to convert CSV and XLS to XML, to transform XML and to convert XML to CSV, HTML, other text files, PDF etc., useful as command line tool and integrated in other projects.

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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: LengthProperty.java 1303891 2012-03-22 17:04:12Z vhennebert $ */

package org.apache.fop.fo.properties;

import org.apache.xmlgraphics.util.UnitConv;

import org.apache.fop.datatypes.Length;
import org.apache.fop.datatypes.Numeric;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.expr.PropertyException;

/**
 * Superclass for properties wrapping a Length value.
 */
public abstract class LengthProperty extends Property
    implements Length, Numeric {

    /**
     * Inner class for making instances of LengthProperty
     */
    public static class Maker extends PropertyMaker {

        /**
         * Constructor
         *
         * @param propId the id of the property for which a Maker should be created
         */
        public Maker(int propId) {
            super(propId);
        }

        /** {@inheritDoc} */
        @Override
        public Property convertProperty(Property p,
                                        PropertyList propertyList,
                                        FObj fo) throws PropertyException {
            if (p instanceof EnumProperty) {
                return new EnumLength(p);
            }
            if (p instanceof LengthProperty) {
                return p;
            }
            if (p instanceof NumberProperty) {
                //Assume pixels (like in HTML) when there's no unit
                float resolution = propertyList.getFObj().getUserAgent().getSourceResolution();
                return FixedLength.getInstance(
                        p.getNumeric().getNumericValue(), "px",
                        UnitConv.IN2PT / resolution);
            }
            Length val = p.getLength();
            if (val != null) {
                return (Property) val;
            }
            /* always null ?? */
            return convertPropertyDatatype(p, propertyList, fo);
        }

    }

    /** @return the numeric dimension. Length always a dimension of 1 */
    public int getDimension() {
        return 1;
    }

    /** @return this.length cast as a Numeric */
    @Override
    public Numeric getNumeric() {
        return this;
    }

    /** @return this.length */
    @Override
    public Length getLength() {
        return this;
    }

    /** @return this.length cast as an Object */
    @Override
    public Object getObject() {
        return this;
    }

}