001    package org.apache.myfaces.tobago.layout;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one or more
005     * contributor license agreements.  See the NOTICE file distributed with
006     * this work for additional information regarding copyright ownership.
007     * The ASF licenses this file to You under the Apache License, Version 2.0
008     * (the "License"); you may not use this file except in compliance with
009     * the License.  You may obtain a copy of the License at
010     *
011     *      http://www.apache.org/licenses/LICENSE-2.0
012     *
013     * Unless required by applicable law or agreed to in writing, software
014     * distributed under the License is distributed on an "AS IS" BASIS,
015     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016     * See the License for the specific language governing permissions and
017     * limitations under the License.
018     */
019    
020    import org.apache.commons.lang.StringUtils;
021    import org.apache.myfaces.tobago.util.LayoutUtil;
022    
023    /*
024     * User: lofwyr
025     * Date: 23.01.2008 20:12:30
026     */
027    public abstract class Measure {
028    
029      // todo: refactor and consolidate with LayoutToken
030    
031      public static Measure parse(String value) {
032        if (StringUtils.isEmpty(value)) {
033          return new PixelMeasure(0); // fixme: may return a "default measure", or is Pixel the default?
034        }
035        // XXX improve code sharing with LayoutTokens.parse
036        if (LayoutUtil.isNumberAndSuffix(value.toLowerCase(), "px")) {
037          return new PixelMeasure(Integer.parseInt(LayoutUtil.removeSuffix(value, "px")));
038        }
039        throw new IllegalArgumentException("Can't parse to any measure: '" + value + "'");
040      }
041    
042      public abstract Measure add(Measure m);
043    
044      public abstract Measure substractNotNegative(Measure m);
045    
046      public abstract int getPixel();
047    }