Source Code Cross Referenced for MinLeafNodeEntry.java in  » Search-Engine » Jofti » com » jofti » btree » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Search Engine » Jofti » com.jofti.btree 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * NodeEntry.java
003:         *
004:         * Created on 25 May 2003, 09:36
005:         */
006:
007:        package com.jofti.btree;
008:
009:        /**
010:         * 
011:         * This is a special object in the tree and is used to represent an absolute minimum leaf entry for the whole tree. <br>
012:         * Class cast issues are taken care of in the Value Object class .<p>
013:         * 
014:         * @author Steve Woodcock
015:         * @version 1.3<br>
016:         */
017:        final class MinLeafNodeEntry extends LeafNodeEntry {
018:
019:            /**
020:             * 
021:             */
022:            private static final long serialVersionUID = -4155706530136083168L;
023:            private final Comparable value = new ValueObject(Integer.MIN_VALUE,
024:                    ValueObject.MIN_COMAPARBLE_VALUE);
025:
026:            public MinLeafNodeEntry() {
027:
028:            }
029:
030:            public Comparable getValue() {
031:                return value;
032:            }
033:
034:            /** Setter for property value.
035:             * @param value New value of property value.
036:             *
037:             */
038:
039:            public void setValue(Comparable value) {
040:                //not supported
041:            }
042:
043:            public String toString() {
044:                StringBuffer buf = new StringBuffer();
045:                buf.append("value:" + value);
046:                buf.append(",");
047:
048:                return buf.toString();
049:            }
050:
051:            /** Compares this object with the specified object for order.  Returns a
052:             * negative integer, zero, or a positive integer as this object is less
053:             * than, equal to, or greater than the specified object.<p>
054:             *
055:             * In the foregoing description, the notation
056:             * <tt>sgn(</tt><i>expression</i><tt>)</tt> designates the mathematical
057:             * <i>signum</i> function, which is defined to return one of <tt>-1</tt>,
058:             * <tt>0</tt>, or <tt>1</tt> according to whether the value of <i>expression</i>
059:             * is negative, zero or positive.
060:             *
061:             * The implementor must ensure <tt>sgn(x.compareTo(y)) ==
062:             * -sgn(y.compareTo(x))</tt> for all <tt>x</tt> and <tt>y</tt>.  (This
063:             * implies that <tt>x.compareTo(y)</tt> must throw an exception iff
064:             * <tt>y.compareTo(x)</tt> throws an exception.)<p>
065:             *
066:             * The implementor must also ensure that the relation is transitive:
067:             * <tt>(x.compareTo(y)&gt;0 &amp;&amp; y.compareTo(z)&gt;0)</tt> implies
068:             * <tt>x.compareTo(z)&gt;0</tt>.<p>
069:             *
070:             * Finally, the implementer must ensure that <tt>x.compareTo(y)==0</tt>
071:             * implies that <tt>sgn(x.compareTo(z)) == sgn(y.compareTo(z))</tt>, for
072:             * all <tt>z</tt>.<p>
073:             *
074:             * It is strongly recommended, but <i>not</i> strictly required that
075:             * <tt>(x.compareTo(y)==0) == (x.equals(y))</tt>.  Generally speaking, any
076:             * class that implements the <tt>Comparable</tt> interface and violates
077:             * this condition should clearly indicate this fact.  The recommended
078:             * language is "Note: this class has a natural ordering that is
079:             * inconsistent with equals."
080:             *
081:             * @param   o the Object to be compared.
082:             * @return  a negative integer, zero, or a positive integer as this object
083:             * 		is less than, equal to, or greater than the specified object.
084:             *
085:             * @throws ClassCastException if the specified object's type prevents it
086:             *         from being compared to this Object.
087:             *
088:             */
089:            public int compareTo(Object o) {
090:                if (o instanceof  MinLeafNodeEntry) {
091:                    return 0;
092:                }
093:                return -1;
094:            }
095:
096:            public boolean equals(Object o) {
097:                if (o == this ) {
098:                    return true;
099:                }
100:                return false;
101:            }
102:
103:        }
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