LayoutBinder.java revision fead9ca09b117136b35bc5bf137340a754f9eddd
1/* 2 * Copyright (C) 2015 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.databinding.tool; 18 19import com.google.common.base.Preconditions; 20 21import android.databinding.tool.expr.Dependency; 22import android.databinding.tool.expr.Expr; 23import android.databinding.tool.expr.ExprModel; 24import android.databinding.tool.expr.IdentifierExpr; 25import android.databinding.tool.store.ResourceBundle; 26import android.databinding.tool.util.ParserHelper; 27import android.databinding.tool.writer.LayoutBinderWriter; 28 29import java.util.ArrayList; 30import java.util.HashMap; 31import java.util.List; 32import java.util.Map; 33 34/** 35 * Keeps all information about the bindings per layout file 36 */ 37public class LayoutBinder { 38 39 /* 40 * val pkg: String, val projectPackage: String, val baseClassName: String, 41 val layoutName:String, val lb: LayoutExprBinding*/ 42 private final ExprModel mExprModel; 43 private final ExpressionParser mExpressionParser; 44 private final List<BindingTarget> mBindingTargets; 45 private String mPackage; 46 private String mModulePackage; 47 private String mProjectPackage; 48 private String mBaseClassName; 49 private final HashMap<String, String> mUserDefinedVariables = new HashMap<String, String>(); 50 51 private LayoutBinderWriter mWriter; 52 private ResourceBundle.LayoutFileBundle mBundle; 53 54 public LayoutBinder(ResourceBundle resourceBundle, 55 ResourceBundle.LayoutFileBundle layoutBundle) { 56 mExprModel = new ExprModel(); 57 mExpressionParser = new ExpressionParser(mExprModel); 58 mBindingTargets = new ArrayList<BindingTarget>(); 59 mBundle = layoutBundle; 60 mProjectPackage = resourceBundle.getAppPackage(); 61 mModulePackage = layoutBundle.getModulePackage(); 62 mPackage = layoutBundle.getModulePackage() + ".generated"; 63 mBaseClassName = ParserHelper.INSTANCE$.toClassName(layoutBundle.getFileName()) + "Binding"; 64 // copy over data. 65 for (Map.Entry<String, String> variable : mBundle.getVariables().entrySet()) { 66 addVariable(variable.getKey(), variable.getValue()); 67 } 68 69 for (Map.Entry<String, String> userImport : mBundle.getImports().entrySet()) { 70 mExprModel.addImport(userImport.getKey(), userImport.getValue()); 71 } 72 for (ResourceBundle.BindingTargetBundle targetBundle : mBundle.getBindingTargetBundles()) { 73 final BindingTarget bindingTarget = createBindingTarget(targetBundle); 74 for (ResourceBundle.BindingTargetBundle.BindingBundle bindingBundle : targetBundle 75 .getBindingBundleList()) { 76 bindingTarget.addBinding(bindingBundle.getName(), parse(bindingBundle.getExpr())); 77 } 78 } 79 } 80 81 public void resolveWhichExpressionsAreUsed() { 82 List<Expr> used = new ArrayList<Expr>(); 83 for (BindingTarget target : mBindingTargets) { 84 for (Binding binding : target.getBindings()) { 85 binding.getExpr().setIsUsed(true); 86 used.add(binding.getExpr()); 87 } 88 } 89 while (!used.isEmpty()) { 90 Expr e = used.remove(used.size() - 1); 91 for (Dependency dep : e.getDependencies()) { 92 if (!dep.getOther().isUsed()) { 93 used.add(dep.getOther()); 94 dep.getOther().setIsUsed(true); 95 } 96 } 97 } 98 } 99 100 public IdentifierExpr addVariable(String name, String type) { 101 Preconditions.checkState(!mUserDefinedVariables.containsKey(name), 102 "%s has already been defined as %s", name, type); 103 final IdentifierExpr id = mExprModel.identifier(name); 104 id.setUserDefinedType(type); 105 id.enableDirectInvalidation(); 106 mUserDefinedVariables.put(name, type); 107 return id; 108 } 109 110 public HashMap<String, String> getUserDefinedVariables() { 111 return mUserDefinedVariables; 112 } 113 114 public BindingTarget createBindingTarget(ResourceBundle.BindingTargetBundle targetBundle) { 115 final BindingTarget target = new BindingTarget(targetBundle); 116 mBindingTargets.add(target); 117 target.setModel(mExprModel); 118 return target; 119 } 120 121 public Expr parse(String input) { 122 final Expr parsed = mExpressionParser.parse(input); 123 parsed.setBindingExpression(true); 124 return parsed; 125 } 126 127 public List<BindingTarget> getBindingTargets() { 128 return mBindingTargets; 129 } 130 131 public boolean isEmpty() { 132 return mExprModel.size() == 0; 133 } 134 135 public ExprModel getModel() { 136 return mExprModel; 137 } 138 139 private void ensureWriter() { 140 if (mWriter == null) { 141 mWriter = new LayoutBinderWriter(this); 142 } 143 } 144 145 public String writeViewBinderInterface() { 146 ensureWriter(); 147 return mWriter.writeBaseClass(); 148 } 149 150 151 public String writeViewBinder() { 152 mExprModel.seal(); 153 ensureWriter(); 154 Preconditions.checkNotNull(mPackage, "package cannot be null"); 155 Preconditions.checkNotNull(mProjectPackage, "project package cannot be null"); 156 Preconditions.checkNotNull(mBaseClassName, "base class name cannot be null"); 157 return mWriter.write(); 158 } 159 160 public String getPackage() { 161 return mPackage; 162 } 163 164 public String getModulePackage() { 165 return mModulePackage; 166 } 167 168 public void setPackage(String aPackage) { 169 mPackage = aPackage; 170 } 171 172 public String getProjectPackage() { 173 return mProjectPackage; 174 } 175 176 public String getLayoutname() { 177 return mBundle.getFileName(); 178 } 179 180 public String getClassName() { 181 final String suffix; 182 if (hasVariations()) { 183 suffix = mBundle.getConfigName(); 184 } else { 185 suffix = ""; 186 } 187 return mBaseClassName + suffix + "Impl"; 188 189 } 190 191 public String getInterfaceName() { 192 return mBaseClassName; 193 } 194 195 public int getId() { 196 return mBundle.getLayoutId(); 197 } 198 199 public boolean hasVariations() { 200 return mBundle.hasVariations(); 201 } 202 203} 204