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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed 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 android.renderscript;
import java.util.concurrent.locks.ReentrantReadWriteLock;
/**
* BaseObj is the base class for all RenderScript objects owned by a RS context.
* It is responsible for lifetime management and resource tracking. This class
* should not be used by a user application.
*
**/
public class BaseObj {
BaseObj(long id, RenderScript rs) {
rs.validate();
mRS = rs;
mID = id;
mDestroyed = false;
}
void setID(long id) {
if (mID != 0) {
throw new RSRuntimeException("Internal Error, reset of object ID.");
}
mID = id;
}
/**
* Lookup the native object ID for this object. Primarily used by the
* generated reflected code.
*
* @param rs Context to verify against internal context for
* match.
*
* @return long
*/
long getID(RenderScript rs) {
mRS.validate();
if (mDestroyed) {
throw new RSInvalidStateException("using a destroyed object.");
}
if (mID == 0) {
throw new RSRuntimeException("Internal error: Object id 0.");
}
if ((rs != null) && (rs != mRS)) {
throw new RSInvalidStateException("using object with mismatched context.");
}
return mID;
}
void checkValid() {
if (mID == 0) {
throw new RSIllegalArgumentException("Invalid object.");
}
}
private long mID;
private boolean mDestroyed;
private String mName;
RenderScript mRS;
/**
* setName assigns a name to an object. This object can later be looked up
* by this name.
*
* @param name The name to assign to the object.
*/
public void setName(String name) {
if (name == null) {
throw new RSIllegalArgumentException(
"setName requires a string of non-zero length.");
}
if(name.length() < 1) {
throw new RSIllegalArgumentException(
"setName does not accept a zero length string.");
}
if(mName != null) {
throw new RSIllegalArgumentException(
"setName object already has a name.");
}
try {
byte[] bytes = name.getBytes("UTF-8");
mRS.nAssignName(mID, bytes);
mName = name;
} catch (java.io.UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
/**
* @return name of the renderscript object
*/
public String getName() {
return mName;
}
private void helpDestroy() {
boolean shouldDestroy = false;
synchronized(this) {
if (!mDestroyed) {
shouldDestroy = true;
mDestroyed = true;
}
}
if (shouldDestroy) {
// must include nObjDestroy in the critical section
ReentrantReadWriteLock.ReadLock rlock = mRS.mRWLock.readLock();
rlock.lock();
// AllocationAdapters are BaseObjs with an ID of 0 but should not be passed to nObjDestroy
if(mRS.isAlive() && mID != 0) {
mRS.nObjDestroy(mID);
}
rlock.unlock();
mRS = null;
mID = 0;
}
}
protected void finalize() throws Throwable {
helpDestroy();
super.finalize();
}
/**
* Frees any native resources associated with this object. The
* primary use is to force immediate cleanup of resources when it is
* believed the GC will not respond quickly enough.
*/
public void destroy() {
if(mDestroyed) {
throw new RSInvalidStateException("Object already destroyed.");
}
helpDestroy();
}
/**
* If an object came from an a3d file, java fields need to be
* created with objects from the native layer
*/
void updateFromNative() {
mRS.validate();
mName = mRS.nGetName(getID(mRS));
}
/**
* Calculates the hash code value for a BaseObj.
*
* @return int
*/
@Override
public int hashCode() {
return (int)((mID & 0xfffffff) ^ (mID >> 32));
}
/**
* Compare the current BaseObj with another BaseObj for equality.
*
* @param obj The object to check equality with.
*
* @return boolean
*/
@Override
public boolean equals(Object obj) {
// Early-out check to see if both BaseObjs are actually the same
if (this == obj)
return true;
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
BaseObj b = (BaseObj) obj;
return mID == b.mID;
}
}
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