001: /* ====================================================================
002: * The QueryForm License, Version 1.1
003: *
004: * Copyright (c) 1998 - 2003 David F. Glasser. All rights
005: * reserved.
006: *
007: * Redistribution and use in source and binary forms, with or without
008: * modification, are permitted provided that the following conditions
009: * are met:
010: *
011: * 1. Redistributions of source code must retain the above copyright
012: * notice, this list of conditions and the following disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The end-user documentation included with the redistribution,
020: * if any, must include the following acknowledgment:
021: * "This product includes software developed by
022: * David F. Glasser."
023: * Alternately, this acknowledgment may appear in the software itself,
024: * if and wherever such third-party acknowledgments normally appear.
025: *
026: * 4. The names "QueryForm" and "David F. Glasser" must
027: * not be used to endorse or promote products derived from this
028: * software without prior written permission. For written
029: * permission, please contact dglasser@pobox.com.
030: *
031: * 5. Products derived from this software may not be called "QueryForm",
032: * nor may "QueryForm" appear in their name, without prior written
033: * permission of David F. Glasser.
034: *
035: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
036: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038: * DISCLAIMED. IN NO EVENT SHALL DAVID F. GLASSER, THE APACHE SOFTWARE
039: * FOUNDATION OR ITS CONTRIBUTORS, OR ANY AUTHORS OR DISTRIBUTORS
040: * OF THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047: * SUCH DAMAGE.
048: * ====================================================================
049: *
050: * This product includes software developed by the
051: * Apache Software Foundation (http://www.apache.org/).
052: *
053: * ====================================================================
054: *
055: * $Source: /cvsroot/qform/qform/src/org/glasser/sql/ResultSetBufferEvent.java,v $
056: * $Revision: 1.2 $
057: * $Author: dglasser $
058: * $Date: 2003/05/01 00:47:41 $
059: *
060: * --------------------------------------------------------------------
061: */
062: package org.glasser.sql;
063:
064: import java.util.*;
065: import org.glasser.util.*;
066:
067: /**
068: * @author David F. Glasser
069: */
070: public final class ResultSetBufferEvent implements SmartEvent,
071: java.io.Serializable {
072:
073: public final static int MORE_ROWS_READ = 0;
074:
075: public final static int END_OF_RESULTS_REACHED = 1;
076:
077: public final static int BUFFER_SORTED = 2;
078:
079: private int type = MORE_ROWS_READ;
080:
081: private ResultSetBuffer source = null;
082:
083: /**
084: * Constructs a ResultSetBufferEvent objects.
085: *
086: * @param source the ResultSetBuffer which originated this event.
087: * @param type an it indicating what type of ResultSetBufferEvent this
088: * is, either MORE_ROWS_READ or END_OF_RESULTS_REACHED.
089: */
090: public ResultSetBufferEvent(ResultSetBuffer source, int type) {
091: this .source = source;
092: this .type = type;
093: }
094:
095: /**
096: * Returns the Class for the interface that receives this type of event; in this
097: * particular case is is ResultSetBufferListener.class.
098: */
099: public Class getListenerClass() {
100: return ResultSetBufferListener.class;
101: }
102:
103: /**
104: * Returns an int indicating the type of ResultSetBufferEvent this is, either
105: * MORE_ROWS_READ or END_OF_RESULTS_REACHED.
106: */
107: public int getType() {
108: return type;
109: }
110:
111: /**
112: * This method, specified by the org.glasser.util.SmartEventListener interface,
113: * is passed a reference to one of the listeners registered to receive this
114: * event. It then calls the appropriate method on the listener interface,
115: * notifying the object of the event.
116: */
117: public void notifyListener(EventListener listener) {
118:
119: ResultSetBufferListener bufferListener = (ResultSetBufferListener) listener;
120:
121: switch (type) {
122: case MORE_ROWS_READ:
123: bufferListener.moreRowsRead(this );
124: break;
125: case END_OF_RESULTS_REACHED:
126: bufferListener.endOfResultsReached(this );
127: break;
128: case BUFFER_SORTED:
129: bufferListener.bufferSorted(this );
130: break;
131: default:
132: throw new RuntimeException(
133: "ResultSetBufferEvent: Invalid Type: " + type);
134: }
135:
136: }
137:
138: }
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