001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *   http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing,
013     * software distributed under the License is distributed on an
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     * KIND, either express or implied.  See the License for the
016     * specific language governing permissions and limitations
017     * under the License.
018     */
019    
020    package org.apache.myfaces.tobago.layout;
021    
022    import org.apache.commons.lang.StringUtils;
023    import org.apache.myfaces.tobago.util.LayoutUtil;
024    
025    /*
026     * User: lofwyr
027     * Date: 23.01.2008 20:12:30
028     */
029    public abstract class Measure {
030    
031      // todo: refactor and consolidate with LayoutToken
032    
033      public static Measure parse(String value) {
034        if (StringUtils.isEmpty(value)) {
035          return new PixelMeasure(0); // fixme: may return a "default measure", or is Pixel the default?
036        }
037        // XXX improve code sharing with LayoutTokens.parse
038        if (LayoutUtil.isNumberAndSuffix(value.toLowerCase(), "px")) {
039          return new PixelMeasure(Integer.parseInt(LayoutUtil.removeSuffix(value, "px")));
040        }
041        throw new IllegalArgumentException("Can't parse to any measure: '" + value + "'");
042      }
043    
044      public abstract Measure add(Measure m);
045    
046      @Deprecated
047      public abstract Measure substractNotNegative(Measure m);
048    
049      public abstract Measure subtractNotNegative(Measure m);
050    
051      public abstract int getPixel();
052    }