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      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 
     17 package android.databinding.tool.expr;
     18 
     19 import android.databinding.tool.processing.Scope;
     20 import android.databinding.tool.reflection.Callable;
     21 import android.databinding.tool.reflection.Callable.Type;
     22 import android.databinding.tool.reflection.ModelAnalyzer;
     23 import android.databinding.tool.reflection.ModelClass;
     24 import android.databinding.tool.reflection.ModelMethod;
     25 import android.databinding.tool.util.L;
     26 
     27 import java.util.ArrayList;
     28 import java.util.Arrays;
     29 import java.util.List;
     30 import static android.databinding.tool.reflection.Callable.STATIC;
     31 import static android.databinding.tool.reflection.Callable.DYNAMIC;
     32 import static android.databinding.tool.reflection.Callable.CAN_BE_INVALIDATED;
     33 
     34 
     35 public class MethodCallExpr extends Expr {
     36     final String mName;
     37 
     38     Callable mGetter;
     39 
     40     static List<Expr> concat(Expr e, List<Expr> list) {
     41         List<Expr> merged = new ArrayList<>();
     42         merged.add(e);
     43         merged.addAll(list);
     44         return merged;
     45     }
     46 
     47     MethodCallExpr(Expr target, String name, List<Expr> args) {
     48         super(concat(target, args));
     49         mName = name;
     50     }
     51 
     52     @Override
     53     public void updateExpr(ModelAnalyzer modelAnalyzer) {
     54         try {
     55             Scope.enter(this);
     56             resolveType(modelAnalyzer);
     57             super.updateExpr(modelAnalyzer);
     58         } finally {
     59             Scope.exit();
     60         }
     61     }
     62 
     63     @Override
     64     protected ModelClass resolveType(ModelAnalyzer modelAnalyzer) {
     65         if (mGetter == null) {
     66             List<ModelClass> args = new ArrayList<ModelClass>();
     67             for (Expr expr : getArgs()) {
     68                 args.add(expr.getResolvedType());
     69             }
     70 
     71             Expr target = getTarget();
     72             boolean isStatic = target instanceof StaticIdentifierExpr;
     73             ModelMethod method = target.getResolvedType().getMethod(mName, args, isStatic);
     74             if (method == null) {
     75                 String message = "cannot find method '" + mName + "' in class " +
     76                         target.getResolvedType().toJavaCode();
     77                 IllegalArgumentException e = new IllegalArgumentException(message);
     78                 L.e(e, "cannot find method %s in class %s", mName,
     79                         target.getResolvedType().toJavaCode());
     80                 throw e;
     81             }
     82             if (!isStatic && method.isStatic()) {
     83                 // found a static method on an instance. Use class instead
     84                 target.getParents().remove(this);
     85                 getChildren().remove(target);
     86                 StaticIdentifierExpr staticId = getModel()
     87                         .staticIdentifierFor(target.getResolvedType());
     88                 getChildren().add(staticId);
     89                 staticId.getParents().add(this);
     90                 // make sure we update this in case we access it below
     91                 target = getTarget();
     92             }
     93             int flags = DYNAMIC;
     94             if (method.isStatic()) {
     95                 flags |= STATIC;
     96             }
     97             mGetter = new Callable(Type.METHOD, method.getName(), method.getReturnType(args), flags);
     98         }
     99         return mGetter.resolvedType;
    100     }
    101 
    102     @Override
    103     protected List<Dependency> constructDependencies() {
    104         final List<Dependency> dependencies = constructDynamicChildrenDependencies();
    105         for (Dependency dependency : dependencies) {
    106             if (dependency.getOther() == getTarget()) {
    107                 dependency.setMandatory(true);
    108             }
    109         }
    110         return dependencies;
    111     }
    112 
    113     @Override
    114     protected String computeUniqueKey() {
    115         return join(getTarget().computeUniqueKey(), mName,
    116                 super.computeUniqueKey());
    117     }
    118 
    119     public Expr getTarget() {
    120         return getChildren().get(0);
    121     }
    122 
    123     public String getName() {
    124         return mName;
    125     }
    126 
    127     public List<Expr> getArgs() {
    128         return getChildren().subList(1, getChildren().size());
    129     }
    130 
    131     public Callable getGetter() {
    132         return mGetter;
    133     }
    134 }
    135