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1: /* =========================================================== 2: * JFreeChart : a free chart library for the Java(tm) platform 3: * =========================================================== 4: * 5: * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jfreechart/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * -------------- 28: * DateRange.java 29: * -------------- 30: * (C) Copyright 2002-2008, by Object Refinery Limited and Contributors. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): Bill Kelemen; 34: * 35: * Changes 36: * ------- 37: * 22-Apr-2002 : Version 1 based on code by Bill Kelemen (DG); 38: * 07-Oct-2002 : Fixed errors reported by Checkstyle (DG); 39: * 23-Sep-2003 : Minor Javadoc update (DG); 40: * 28-May-2008 : Fixed problem with immutability (DG); 41: * 42: */ 43: 44: package org.jfree.data.time; 45: 46: import java.io.Serializable; 47: import java.text.DateFormat; 48: import java.util.Date; 49: 50: import org.jfree.data.Range; 51: 52: /** 53: * A range specified in terms of two <code>java.util.Date</code> objects. 54: * Instances of this class are immutable. 55: */ 56: public class DateRange extends Range implements Serializable { 57: 58: /** For serialization. */ 59: private static final long serialVersionUID = -4705682568375418157L; 60: 61: /** The lower bound for the range. */ 62: private long lowerDate; 63: 64: /** The upper bound for the range. */ 65: private long upperDate; 66: 67: /** 68: * Default constructor. 69: */ 70: public DateRange() { 71: this(new Date(0), new Date(1)); 72: } 73: 74: /** 75: * Constructs a new range. 76: * 77: * @param lower the lower bound (<code>null</code> not permitted). 78: * @param upper the upper bound (<code>null</code> not permitted). 79: */ 80: public DateRange(Date lower, Date upper) { 81: super(lower.getTime(), upper.getTime()); 82: this.lowerDate = lower.getTime(); 83: this.upperDate = upper.getTime(); 84: } 85: 86: /** 87: * Constructs a new range using two values that will be interpreted as 88: * "milliseconds since midnight GMT, 1-Jan-1970". 89: * 90: * @param lower the lower (oldest) date. 91: * @param upper the upper (most recent) date. 92: */ 93: public DateRange(double lower, double upper) { 94: super(lower, upper); 95: this.lowerDate = (long) lower; 96: this.upperDate = (long) upper; 97: } 98: 99: /** 100: * Constructs a new range that is based on another {@link Range}. The 101: * other range does not have to be a {@link DateRange}. If it is not, the 102: * upper and lower bounds are evaluated as milliseconds since midnight 103: * GMT, 1-Jan-1970. 104: * 105: * @param other the other range (<code>null</code> not permitted). 106: */ 107: public DateRange(Range other) { 108: this(other.getLowerBound(), other.getUpperBound()); 109: } 110: 111: /** 112: * Returns the lower (earlier) date for the range. 113: * 114: * @return The lower date for the range. 115: */ 116: public Date getLowerDate() { 117: return new Date(this.lowerDate); 118: } 119: 120: /** 121: * Returns the upper (later) date for the range. 122: * 123: * @return The upper date for the range. 124: */ 125: public Date getUpperDate() { 126: return new Date(this.upperDate); 127: } 128: 129: /** 130: * Returns a string representing the date range (useful for debugging). 131: * 132: * @return A string representing the date range. 133: */ 134: public String toString() { 135: DateFormat df = DateFormat.getDateTimeInstance(); 136: return "[" + df.format(getLowerDate()) + " --> " 137: + df.format(getUpperDate()) + "]"; 138: } 139: 140: }