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

Go to download

Show more of this group Show more artifacts with this name
Show all versions of fop Show documentation

Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF.

There is a newer version: 2.10

Show newest version

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

package org.apache.fop.fo.properties;

import org.apache.fop.fo.FObj;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.expr.PropertyException;
import org.apache.fop.util.CompareUtil;

/**
 * Superclass for properties that wrap an enumeration value
 */
public final class EnumProperty extends Property {

    /** cache holding all canonical EnumProperty instances */
    private static final PropertyCache CACHE
            = new PropertyCache();

    /**
     * Inner class for creating EnumProperty instances
     */
    public static class Maker extends PropertyMaker {

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

        /**
         * Called by subclass if no match found.
         * @param value string containing the value to be checked
         * @return null (indicates that an appropriate match was not found)
         */
        public Property checkEnumValues(String value) {
            //log.error("Unknown enumerated value for property '"
            //                       + getPropName() + "': " + value);
            return super.checkEnumValues(value);
        }

        /**
         * Convert a property.
         * @param p the property to convert
         * @param propertyList the property list to use in conversion
         * @param fo the FO to use in conversion
         * @return the converted property
         * @throws PropertyException if a property conversion exception occurs
         */
        public Property convertProperty(Property p,
                                        PropertyList propertyList,
                                        FObj fo) throws PropertyException {
            if (p instanceof EnumProperty) {
                return p;
            } else {
                return super.convertProperty(p, propertyList, fo);
            }
        }
    }

    private final int value;
    private final String text;

    /**
     * @param explicitValue enumerated value to be set for this property
     * @param text the string value of the enum.
     */
    private EnumProperty(int explicitValue, String text) {
        this.value = explicitValue;
        this.text = text;
    }

    /**
     * Construct an enumeration property.
     * @param explicitValue the value
     * @param text the text
     * @return an enumeration property
     */
    public static EnumProperty getInstance(int explicitValue, String text) {
        return CACHE.fetch(new EnumProperty(explicitValue, text));
    }

    /**
     * @return this.value
     */
    public int getEnum() {
        return this.value;
    }

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

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof EnumProperty) {
            EnumProperty ep = (EnumProperty)obj;
            return this.value == ep.value
                    && CompareUtil.equal(text, ep.text);
        } else {
            return false;
        }
    }

    @Override
    public int hashCode() {
        return value + text.hashCode();
    }
}