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1: /* =========================================================== 2: * JFreeChart : a free chart library for the Java(tm) platform 3: * =========================================================== 4: * 5: * (C) Copyright 2000-2007, 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 2002-2007, 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: * 41: */ 42: 43: package org.jfree.data.time; 44: 45: import java.io.Serializable; 46: import java.text.DateFormat; 47: import java.util.Date; 48: 49: import org.jfree.data.Range; 50: 51: /** 52: * A range specified in terms of two <code>java.util.Date</code> objects. 53: * Instances of this class are immutable. 54: */ 55: public class DateRange extends Range implements Serializable { 56: 57: /** For serialization. */ 58: private static final long serialVersionUID = -4705682568375418157L; 59: 60: /** The lower bound for the range. */ 61: private Date lowerDate; 62: 63: /** The upper bound for the range. */ 64: private Date upperDate; 65: 66: /** 67: * Default constructor. 68: */ 69: public DateRange() { 70: this(new Date(0), new Date(1)); 71: } 72: 73: /** 74: * Constructs a new range. 75: * 76: * @param lower the lower bound (<code>null</code> not permitted). 77: * @param upper the upper bound (<code>null</code> not permitted). 78: */ 79: public DateRange(Date lower, Date upper) { 80: 81: super(lower.getTime(), upper.getTime()); 82: this.lowerDate = lower; 83: this.upperDate = upper; 84: 85: } 86: 87: /** 88: * Constructs a new range using two values that will be interpreted as 89: * "milliseconds since midnight GMT, 1-Jan-1970". 90: * 91: * @param lower the lower (oldest) date. 92: * @param upper the upper (most recent) date. 93: */ 94: public DateRange(double lower, double upper) { 95: super(lower, upper); 96: this.lowerDate = new Date((long) lower); 97: this.upperDate = new Date((long) upper); 98: } 99: 100: /** 101: * Constructs a new range that is based on another {@link Range}. The 102: * other range does not have to be a {@link DateRange}. If it is not, the 103: * upper and lower bounds are evaluated as milliseconds since midnight 104: * GMT, 1-Jan-1970. 105: * 106: * @param other the other range (<code>null</code> not permitted). 107: */ 108: public DateRange(Range other) { 109: this(other.getLowerBound(), other.getUpperBound()); 110: } 111: 112: /** 113: * Returns the lower (earlier) date for the range. 114: * 115: * @return The lower date for the range. 116: */ 117: public Date getLowerDate() { 118: return this.lowerDate; 119: } 120: 121: /** 122: * Returns the upper (later) date for the range. 123: * 124: * @return The upper date for the range. 125: */ 126: public Date getUpperDate() { 127: return this.upperDate; 128: } 129: 130: /** 131: * Returns a string representing the date range (useful for debugging). 132: * 133: * @return A string representing the date range. 134: */ 135: public String toString() { 136: DateFormat df = DateFormat.getDateTimeInstance(); 137: return "[" + df.format(this.lowerDate) + " --> " 138: + df.format(this.upperDate) + "]"; 139: } 140: 141: }