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      1 /*
      2  * Copyright (C) 2011 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 
     17 package com.android.ide.eclipse.gltrace.state.transforms;
     18 
     19 import com.android.ide.eclipse.gltrace.state.GLCompositeProperty;
     20 import com.android.ide.eclipse.gltrace.state.GLListProperty;
     21 import com.android.ide.eclipse.gltrace.state.GLSparseArrayProperty;
     22 import com.android.ide.eclipse.gltrace.state.GLStateType;
     23 import com.android.ide.eclipse.gltrace.state.IGLProperty;
     24 
     25 import java.util.ArrayList;
     26 import java.util.List;
     27 
     28 /**
     29  * GLPropertyAccessor's can be used to extract a certain property from the provided
     30  * OpenGL State hierarchy.
     31  */
     32 public class GLPropertyAccessor implements IGLPropertyAccessor {
     33     private final int mContextId;
     34     private final List<GLPropertyExtractor> mExtractors;
     35 
     36     private GLPropertyAccessor(int contextId, List<GLPropertyExtractor> extractors) {
     37         mContextId = contextId;
     38         mExtractors = extractors;
     39     }
     40 
     41     @Override
     42     public IGLProperty getProperty(IGLProperty state) {
     43         IGLProperty root = ((GLListProperty) state).get(mContextId);
     44 
     45         for (GLPropertyExtractor e : mExtractors) {
     46             IGLProperty successor = e.getProperty(root);
     47             if (successor == null) {
     48                 root = null;
     49                 break;
     50             }
     51             root = successor;
     52         }
     53 
     54         return root;
     55     }
     56 
     57     /**
     58      * Factory method used to construct a {@link GLPropertyAccessor}.
     59      * @param contextId id of affected context
     60      * @param accessors list of accessor's to be used to navigate the property hierarchy. The
     61      *                  accessors are either Integers or {@link GLStateType} objects. Integers
     62      *                  are assumed to be indexes in a {@link GLListProperty} or
     63      *                  {@link GLSparseArrayProperty}, and the GLStateType enum objects are
     64      *                  used to query {@link GLCompositeProperty}'s.
     65      */
     66     public static IGLPropertyAccessor makeAccessor(int contextId, Object...accessors) {
     67         List<GLPropertyExtractor> extractors = new ArrayList<GLPropertyExtractor>();
     68 
     69         for (Object accessor : accessors) {
     70             if (accessor instanceof GLStateType) {
     71                 extractors.add(new GLNamePropertyExtractor((GLStateType) accessor));
     72             } else if (accessor instanceof Integer) {
     73                 extractors.add(new GLIndexPropertyExtractor((Integer) accessor));
     74             } else {
     75                 throw new IllegalArgumentException("Unknown property (" + accessor
     76                         + ") used to access members of IGLProperty");
     77             }
     78         }
     79 
     80         return new GLPropertyAccessor(contextId, extractors);
     81     }
     82 
     83     private interface GLPropertyExtractor {
     84         IGLProperty getProperty(IGLProperty p);
     85     }
     86 
     87     /** Extract properties by name. */
     88     private static class GLNamePropertyExtractor implements GLPropertyExtractor {
     89         private final GLStateType mType;
     90 
     91         public GLNamePropertyExtractor(GLStateType type) {
     92             mType = type;
     93         }
     94 
     95         @Override
     96         public IGLProperty getProperty(IGLProperty p) {
     97             if (p instanceof GLCompositeProperty) {
     98                 return ((GLCompositeProperty) p).getProperty(mType);
     99             }
    100 
    101             return null;
    102         }
    103     }
    104 
    105     /** Extract properties by index. */
    106     private static class GLIndexPropertyExtractor implements GLPropertyExtractor {
    107         private final int mIndex;
    108 
    109         public GLIndexPropertyExtractor(int index) {
    110             mIndex = index;
    111         }
    112 
    113         @Override
    114         public IGLProperty getProperty(IGLProperty p) {
    115             if (p instanceof GLListProperty && mIndex >= 0) {
    116                 return ((GLListProperty) p).get(mIndex);
    117             }
    118             if (p instanceof GLSparseArrayProperty) {
    119                 return ((GLSparseArrayProperty) p).getProperty(mIndex);
    120             }
    121             return null;
    122         }
    123     }
    124 
    125     @Override
    126     public String getPath() {
    127         StringBuilder sb = new StringBuilder(mExtractors.size() * 10);
    128         for (GLPropertyExtractor e: mExtractors) {
    129             if (e instanceof GLNamePropertyExtractor) {
    130                 sb.append(((GLNamePropertyExtractor) e).mType);
    131             } else {
    132                 sb.append(((GLIndexPropertyExtractor) e).mIndex);
    133             }
    134             sb.append('/');
    135         }
    136 
    137         return sb.toString();
    138     }
    139 }
    140