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.logging.Log;
021    import org.apache.commons.logging.LogFactory;
022    
023    /*
024     * Date: 23.01.2008 20:21:08
025     */
026    public final class PixelMeasure extends Measure {
027    
028      private static final Log LOG = LogFactory.getLog(PixelMeasure.class);
029    
030      private static final PixelMeasure NULL = new PixelMeasure(0);
031    
032      private final int pixel;
033    
034      public PixelMeasure(int pixel) {
035        this.pixel = pixel;
036      }
037    
038      public Measure add(Measure m) {
039        return new PixelMeasure(pixel + m.getPixel());
040      }
041    
042      public Measure substractNotNegative(Measure m) {
043        if (m.getPixel() > pixel) {
044          LOG.warn("Not enough space! value=" + pixel);
045          return NULL;
046        } else {
047          return new PixelMeasure(pixel + m.getPixel());
048        }
049      }
050    
051      public int getPixel() {
052        return pixel;
053      }
054    
055      @Override
056      public String toString() {
057        return pixel + "px";
058      }
059    
060    }