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/rs/java/android/renderscript/BaseObj.java

https://github.com/aizuzi/platform_frameworks_base
Java | 196 lines | 112 code | 21 blank | 63 comment | 29 complexity | 9d50401cd2416ec44cf091d0d589d60f MD5 | raw file
  1/*
  2 * Copyright (C) 2008 The Android Open Source Project
  3 *
  4 * Licensed under the Apache License, Version 2.0 (the "License");
  5 * you may not use this file except in compliance with the License.
  6 * You may obtain a copy of the License at
  7 *
  8 *      http://www.apache.org/licenses/LICENSE-2.0
  9 *
 10 * Unless required by applicable law or agreed to in writing, software
 11 * distributed under the License is distributed on an "AS IS" BASIS,
 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 13 * See the License for the specific language governing permissions and
 14 * limitations under the License.
 15 */
 16
 17package android.renderscript;
 18
 19import java.util.concurrent.locks.ReentrantReadWriteLock;
 20
 21/**
 22 * BaseObj is the base class for all RenderScript objects owned by a RS context.
 23 * It is responsible for lifetime management and resource tracking. This class
 24 * should not be used by a user application.
 25 *
 26 **/
 27public class BaseObj {
 28    BaseObj(long id, RenderScript rs) {
 29        rs.validate();
 30        mRS = rs;
 31        mID = id;
 32        mDestroyed = false;
 33    }
 34
 35    void setID(long id) {
 36        if (mID != 0) {
 37            throw new RSRuntimeException("Internal Error, reset of object ID.");
 38        }
 39        mID = id;
 40    }
 41
 42    /**
 43     * Lookup the native object ID for this object.  Primarily used by the
 44     * generated reflected code.
 45     *
 46     * @param rs Context to verify against internal context for
 47     *           match.
 48     *
 49     * @return long
 50     */
 51    long getID(RenderScript rs) {
 52        mRS.validate();
 53        if (mDestroyed) {
 54            throw new RSInvalidStateException("using a destroyed object.");
 55        }
 56        if (mID == 0) {
 57            throw new RSRuntimeException("Internal error: Object id 0.");
 58        }
 59        if ((rs != null) && (rs != mRS)) {
 60            throw new RSInvalidStateException("using object with mismatched context.");
 61        }
 62        return mID;
 63    }
 64
 65    void checkValid() {
 66        if (mID == 0) {
 67            throw new RSIllegalArgumentException("Invalid object.");
 68        }
 69    }
 70
 71    private long mID;
 72    private boolean mDestroyed;
 73    private String mName;
 74    RenderScript mRS;
 75
 76    /**
 77     * setName assigns a name to an object.  This object can later be looked up
 78     * by this name.
 79     *
 80     * @param name The name to assign to the object.
 81     */
 82    public void setName(String name) {
 83        if (name == null) {
 84            throw new RSIllegalArgumentException(
 85                "setName requires a string of non-zero length.");
 86        }
 87        if(name.length() < 1) {
 88            throw new RSIllegalArgumentException(
 89                "setName does not accept a zero length string.");
 90        }
 91        if(mName != null) {
 92            throw new RSIllegalArgumentException(
 93                "setName object already has a name.");
 94        }
 95
 96        try {
 97            byte[] bytes = name.getBytes("UTF-8");
 98            mRS.nAssignName(mID, bytes);
 99            mName = name;
100        } catch (java.io.UnsupportedEncodingException e) {
101            throw new RuntimeException(e);
102        }
103    }
104
105    /**
106     * @return name of the renderscript object
107     */
108    public String getName() {
109        return mName;
110    }
111
112    private void helpDestroy() {
113        boolean shouldDestroy = false;
114        synchronized(this) {
115            if (!mDestroyed) {
116                shouldDestroy = true;
117                mDestroyed = true;
118            }
119        }
120
121        if (shouldDestroy) {
122            // must include nObjDestroy in the critical section
123            ReentrantReadWriteLock.ReadLock rlock = mRS.mRWLock.readLock();
124            rlock.lock();
125            // AllocationAdapters are BaseObjs with an ID of 0 but should not be passed to nObjDestroy
126            if(mRS.isAlive() && mID != 0) {
127                mRS.nObjDestroy(mID);
128            }
129            rlock.unlock();
130            mRS = null;
131            mID = 0;
132        }
133    }
134
135    protected void finalize() throws Throwable {
136        helpDestroy();
137        super.finalize();
138    }
139
140    /**
141     * Frees any native resources associated with this object.  The
142     * primary use is to force immediate cleanup of resources when it is
143     * believed the GC will not respond quickly enough.
144     */
145    public void destroy() {
146        if(mDestroyed) {
147            throw new RSInvalidStateException("Object already destroyed.");
148        }
149        helpDestroy();
150    }
151
152    /**
153     * If an object came from an a3d file, java fields need to be
154     * created with objects from the native layer
155     */
156    void updateFromNative() {
157        mRS.validate();
158        mName = mRS.nGetName(getID(mRS));
159    }
160
161    /**
162     * Calculates the hash code value for a BaseObj.
163     *
164     * @return int
165     */
166    @Override
167    public int hashCode() {
168        return (int)((mID & 0xfffffff) ^ (mID >> 32));
169    }
170
171    /**
172     * Compare the current BaseObj with another BaseObj for equality.
173     *
174     * @param obj The object to check equality with.
175     *
176     * @return boolean
177     */
178    @Override
179    public boolean equals(Object obj) {
180        // Early-out check to see if both BaseObjs are actually the same
181        if (this == obj)
182            return true;
183
184        if (obj == null) {
185            return false;
186        }
187
188        if (getClass() != obj.getClass()) {
189            return false;
190        }
191
192        BaseObj b = (BaseObj) obj;
193        return mID == b.mID;
194    }
195}
196