org.apache.openjpa.meta.LifecycleMetaData Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.openjpa.meta;
import java.io.Serializable;
import java.util.Arrays;
import org.apache.openjpa.event.LifecycleCallbacks;
import org.apache.openjpa.event.LifecycleEvent;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.util.InternalException;
/**
* Information about lifecycle events for a managed type.
*
* @author Steve Kim
* @author Abe White
*/
public class LifecycleMetaData
implements Serializable {
public static final int IGNORE_NONE = 0;
public static final int IGNORE_HIGH = 2 << 0;
public static final int IGNORE_LOW = 2 << 1;
private static final LifecycleCallbacks[] EMPTY_CALLBACKS =
new LifecycleCallbacks[0];
private static final Localizer _loc = Localizer.forPackage
(LifecycleMetaData.class);
private final ClassMetaData _meta;
private LifecycleCallbacks[][] _declared = null;
private LifecycleCallbacks[][] _super = null;
private LifecycleCallbacks[][] _all = null;
private int[] _high = null;
private int[] _superHigh = null;
private boolean _resolved = false;
private boolean _ignoreSystem = false;
private int _ignoreSups = 0;
private boolean _activated = false;
/**
* Construct with owning metadata.
*/
LifecycleMetaData(ClassMetaData meta) {
_meta = meta;
}
/**
* Whether the LifeCycleMetaData has had any callbacks or listeners registered. Used
* for a quick test to determine whether to attempt to fire any events.
* @return boolean
*/
public boolean is_activated() {
return _activated;
}
/**
* Whether to exclude system listeners from events.
*/
public boolean getIgnoreSystemListeners() {
return _ignoreSystem;
}
/**
* Whether to exclude system listeners from events.
*/
public void setIgnoreSystemListeners(boolean ignore) {
_ignoreSystem = ignore;
}
/**
* Whether to exclude superclass callbacks from events.
*/
public int getIgnoreSuperclassCallbacks() {
return _ignoreSups;
}
/**
* Whether to exclude superclass callbacks from events.
*/
public void setIgnoreSuperclassCallbacks(int ignore) {
_ignoreSups = ignore;
}
/**
* Return the declared callbacks for the given event type.
*/
public LifecycleCallbacks[] getDeclaredCallbacks(int eventType) {
return (_declared == null || _declared[eventType] == null)
? EMPTY_CALLBACKS : _declared[eventType];
}
/**
* Return all callbacks for the given event type, including superclass
* callbacks if appropriate.
*/
public LifecycleCallbacks[] getCallbacks(int eventType) {
resolve();
return (_all == null || _all[eventType] == null)
? EMPTY_CALLBACKS : _all[eventType];
}
/**
* Set the callbacks for the given event type.
*
* @param highPriority the first N given callbacks are high priority;
* high priority callbacks will be returned before
* non-high-priority superclass callbacks
*/
public void setDeclaredCallbacks(int eventType,
LifecycleCallbacks[] callbacks, int highPriority) {
if (_resolved)
throw new InternalException(_loc.get("lifecycle-resolved",
_meta, Arrays.asList(callbacks)));
if (_declared == null) {
_declared = new LifecycleCallbacks
[LifecycleEvent.ALL_EVENTS.length][];
_high = new int[LifecycleEvent.ALL_EVENTS.length];
}
_declared[eventType] = callbacks;
_high[eventType] = highPriority;
_activated = true;
}
/**
* Return the callbacks for the non-PC superclass.
*/
public LifecycleCallbacks[] getNonPCSuperclassCallbacks
(int eventType) {
return (_super == null || _super[eventType] == null)
? EMPTY_CALLBACKS : _super[eventType];
}
/**
* Set the callbacks for the given event type for non-persistent
* superclass. Note these callbacks will only be used where the
* non-persistent superclass is the direct ancestor of the described class.
*
* @param highPriority the first N given callbacks are high priority;
* high priority callbacks will be returned before
* non-high-priority superclass callbacks
*/
public void setNonPCSuperclassCallbacks(int eventType,
LifecycleCallbacks[] callbacks, int highPriority) {
if (_resolved)
throw new InternalException(_loc.get("lifecycle-resolved",
_meta, Arrays.asList(callbacks)));
if (_super == null) {
_super = new LifecycleCallbacks
[LifecycleEvent.ALL_EVENTS.length][];
_superHigh = new int[LifecycleEvent.ALL_EVENTS.length];
}
_super[eventType] = callbacks;
_superHigh[eventType] = highPriority;
_activated = true;
}
/**
* Resolve all callbacks.
*/
void resolve() {
if (!_resolved) {
_all = combineCallbacks();
_resolved = true;
}
}
/**
* Combine our callbacks with superclass callbacks as necessary.
* This method has the side effect of manipulating the _high array to
* reflect the combined callbacks rather than the declared ones.
*/
private LifecycleCallbacks[][] combineCallbacks() {
if (_ignoreSups == (IGNORE_HIGH | IGNORE_LOW))
return _declared;
LifecycleMetaData supMeta = (_meta.getPCSuperclass() == null) ? null
: _meta.getPCSuperclassMetaData().getLifecycleMetaData();
if (supMeta == null && _super == null)
return _declared;
if (supMeta != null) {
supMeta.resolve();
if (supMeta._all == null)
return _declared;
if (_declared == null && _ignoreSups == 0) {
_high = supMeta._high;
_activated = true;
return supMeta._all;
}
// don't hold strong refs onto redundant info
_super = null;
_superHigh = null;
}
LifecycleCallbacks[][] all = new LifecycleCallbacks
[LifecycleEvent.ALL_EVENTS.length][];
LifecycleCallbacks[] decs, sups;
int supStart, supEnd, supHigh;
int count;
for (int i = 0; i < all.length; i++) {
decs = getDeclaredCallbacks(i);
if (supMeta == null) {
sups = (_super[i] == null) ? EMPTY_CALLBACKS : _super[i];
supHigh = (_superHigh == null) ? 0 : _superHigh[i];
} else {
sups = supMeta.getCallbacks(i);
supHigh = (supMeta._high == null) ? 0 : supMeta._high[i];
}
supStart = ((_ignoreSups & IGNORE_HIGH) != 0) ? supHigh : 0;
supEnd = ((_ignoreSups & IGNORE_LOW) != 0) ? supHigh : sups.length;
if (supEnd - supStart == 0)
all[i] = decs;
else if (decs.length == 0) {
if (supEnd - supStart == sups.length)
all[i] = sups;
else {
all[i] = new LifecycleCallbacks[supEnd - supStart];
System.arraycopy(sups, supStart, all[i], 0, all[i].length);
}
if (_high == null)
_high = new int[all.length];
_high[i] = supHigh - supStart;
} else {
all[i] =
new LifecycleCallbacks[decs.length + supEnd - supStart];
count = 0;
// add superclass high priority callbacks first
if ((_ignoreSups & IGNORE_HIGH) == 0)
for (int j = 0; j < supHigh; j++)
all[i][count++] = sups[j];
// then our high priority
for (int j = 0; j < _high[i]; j++)
all[i][count++] = decs[j];
// then superclass low priority
if ((_ignoreSups & IGNORE_LOW) == 0)
for (int j = supHigh; j < sups.length; j++)
all[i][count++] = sups[j];
// then our low priority
for (int j = _high[i]; j < decs.length; j++)
all[i][count++] = decs[j];
if ((_ignoreSups & IGNORE_HIGH) == 0)
_high[i] += supHigh;
}
}
return all;
}
}