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 GLPropertyAccessor(int contextId, List<GLPropertyExtractor> extractors)36 private GLPropertyAccessor(int contextId, List<GLPropertyExtractor> extractors) { 37 mContextId = contextId; 38 mExtractors = extractors; 39 } 40 41 @Override getProperty(IGLProperty state)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 */ makeAccessor(int contextId, Object...accessors)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 { getProperty(IGLProperty p)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 GLNamePropertyExtractor(GLStateType type)91 public GLNamePropertyExtractor(GLStateType type) { 92 mType = type; 93 } 94 95 @Override getProperty(IGLProperty p)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 GLIndexPropertyExtractor(int index)109 public GLIndexPropertyExtractor(int index) { 110 mIndex = index; 111 } 112 113 @Override getProperty(IGLProperty p)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 getPath()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