Source Code Cross Referenced for IntervalTimeInstance.java in  » 6.0-JDK-Modules » j2me » com » sun » perseus » model » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.perseus.model 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *
003:         *
004:         * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation.
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt).
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions.
025:         */
026:        package com.sun.perseus.model;
027:
028:        /**
029:         * This specialized <code>TimeInstance</code> is created by 
030:         * <code>SyncBaseCondition</code> time conditions.
031:         *
032:         * <p><code>IntervalTimeInstance</code> instances can be notified
033:         * of updates by the <code>TimeCondition</code> which created it.
034:         * This update can result on a <code>Time</code> update on the
035:         * instance depending on context.
036:         *
037:         * @see <a href="http://www.w3.org/TR/smil20/smil-timing.html#Timing-PropagatingTimes">
038:         *      SMIL 2 Timing: Propagating changes to time</a>
039:         *
040:         * @version $Id: IntervalTimeInstance.java,v 1.3 2006/06/29 10:47:32 ln156897 Exp $
041:         */
042:        final class IntervalTimeInstance extends TimeInstance {
043:            /**
044:             * Offset from the interval sync base.
045:             */
046:            long offset;
047:
048:            /**
049:             * Associated interval.
050:             */
051:            TimeInterval timeInterval;
052:
053:            /**
054:             * Controls whether the instance synchronizes on begin or end
055:             */
056:            boolean isBeginSync;
057:
058:            /**
059:             * Associated syncBase
060:             */
061:            TimedElementSupport syncBase;
062:
063:            /**
064:             * Builds an instance time for the input <code>TimedElementSupport</code>
065:             * and time. The constructor will insert the instance
066:             * automatically into the <code>TimeInterval</code>'s corresponding
067:             * dependent list
068:             *
069:             * @param timedElement the associated <code>TimedElementSupport</code>. 
070:             *        Should not be null.
071:             * @param syncBase the <code>TimedElementSupport</code> this time instance
072:             *        synchronizes with.
073:             * @param offset this instance offset from the synch base.
074:             * @param clearOnReset defines whether or not this instance should
075:             *        be cleared from instance times lists on reset.
076:             * @param isBegin true if this object is part of the 
077:             *        timedElement's begin instance list.
078:             * @param isBeginSync true if this instance is synchronized on the 
079:             *        interval's begin time. False if this instance is synchronized 
080:             *        on the interval's end time.
081:             */
082:            IntervalTimeInstance(final TimedElementSupport timedElement,
083:                    final TimedElementSupport syncBase, final long offset,
084:                    final boolean clearOnReset, final boolean isBegin,
085:                    final boolean isBeginSync) {
086:                super (timedElement, getTime(syncBase.currentInterval,
087:                        isBeginSync, offset, timedElement, syncBase),
088:                        clearOnReset, isBegin);
089:
090:                this .offset = offset;
091:                this .syncBase = syncBase;
092:                this .timeInterval = syncBase.currentInterval;
093:                this .isBeginSync = isBeginSync;
094:
095:                timeInterval.addDependent(this );
096:            }
097:
098:            /**
099:             * Invoke when this instance is no longer in a begin or end instance list,
100:             * i.e., when it is removed from one of these lists.
101:             *
102:             */
103:            void dispose() {
104:                timeInterval.removeDependent(this );
105:            }
106:
107:            /**
108:             * Implementation helpers. 
109:             *
110:             * @param interval the interval to get
111:             * @param isBeginSync the time to get
112:             * @param offset offset from the sync base value.
113:             * @param timedElement the TimedElementSupport to which the interval
114:             *        belongs
115:             * @param syncBase the TimedElementSupport with which the timedElement
116:             *        is synchronized.
117:             *
118:             * @return the input interval's begin or end time. This method accounts for
119:             * the offset from the syncBase and for the time convertion between the
120:             * syncBase and the instance's timedElement.
121:             */
122:            private static Time getTime(final TimeInterval interval,
123:                    final boolean isBeginSync, final long offset,
124:                    final TimedElementSupport timedElement,
125:                    final TimedElementSupport syncBase) {
126:                if (isBeginSync && !interval.begin.isResolved()) {
127:                    // 'unresolved' and 'indefinite' times are not
128:                    // legal begin time for intervals. This is an illegal
129:                    // state, so we throw an exception.
130:                    throw new IllegalStateException();
131:                }
132:
133:                Time t = interval.begin;
134:                if (!isBeginSync) {
135:                    t = interval.end;
136:                }
137:
138:                if (!t.isResolved()) {
139:                    return t;
140:                } else {
141:                    // Convert the time value from the syncBase's time space
142:                    // to the timedElement time space.
143:                    Time time = new Time(t.value + offset);
144:                    return timedElement.toContainerSimpleTime(syncBase
145:                            .toRootContainerSimpleTime(time));
146:                }
147:            }
148:
149:            /**
150:             * Used to synchronize this instance's time with its syncBase time. This is 
151:             * used when resetting timed elements.
152:             */
153:            void syncTime() {
154:                setTime(getTime(timeInterval, isBeginSync, offset,
155:                        timedElement, syncBase));
156:            }
157:
158:            /**
159:             * Must be called by the <code>TimeInterval</code>'s begin
160:             * or end time this instance depends on changes.
161:             * 
162:             * <p>This method update this time instance with a new
163:             * time, accounting for the offset from the sync base.</p>
164:             *
165:             */
166:            void onIntervalUpdate() {
167:                setTime(getTime(timeInterval, isBeginSync, offset,
168:                        timedElement, syncBase));
169:            }
170:
171:        }
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