icu/tools/srcgen/currysrc/src/main/java/com/google/currysrc/api/process/ast/MethodLocator.java

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.currysrc.api.process.ast;

import org.eclipse.jdt.core.dom.AbstractTypeDeclaration;
import org.eclipse.jdt.core.dom.BodyDeclaration;
import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jdt.core.dom.MethodDeclaration;

import java.util.List;

/**
 * Locates the {@link org.eclipse.jdt.core.dom.BodyDeclaration} associated with a method
 * declaration.
 */
public final class MethodLocator implements BodyDeclarationLocator {

  static final String LOCATOR_TYPE_NAME = "method";

  private final TypeLocator typeLocator;

  private final String methodName;

  private final ParameterMatcher parameterMatcher;

  public MethodLocator(TypeLocator typeLocator, String methodName, List<String> parameterTypes) {
    this.typeLocator = typeLocator;
    this.methodName = methodName;
    this.parameterMatcher = new ParameterMatcher(parameterTypes);
  }

  @Override public TypeLocator getTypeLocator() {
    return typeLocator;
  }

  @Override
  public boolean matches(BodyDeclaration node) {
    if (node instanceof MethodDeclaration) {
      BodyDeclaration parentNode = (BodyDeclaration) node.getParent();
      MethodDeclaration methodDeclaration = (MethodDeclaration) node;
      return typeLocator.matches(parentNode)
          && methodDeclaration.getName().getFullyQualifiedName().equals(methodName)
          && parameterMatcher.matches(methodDeclaration);
    }
    return false;
  }

  @Override
  public MethodDeclaration find(CompilationUnit cu) {
    AbstractTypeDeclaration typeDeclaration = typeLocator.find(cu);
    if (typeDeclaration == null) {
      return null;
    }
    for (BodyDeclaration bodyDeclaration
        : (List<BodyDeclaration>) typeDeclaration.bodyDeclarations()) {
      if (bodyDeclaration instanceof MethodDeclaration) {
        MethodDeclaration methodDeclaration = (MethodDeclaration) bodyDeclaration;
        if (methodDeclaration.getName().getFullyQualifiedName().equals(methodName)) {
          if (parameterMatcher.matches(methodDeclaration)) {
            return methodDeclaration;
          }
        }
      }
    }
    return null;
  }

  @Override public String getStringFormType() {
    return LOCATOR_TYPE_NAME;
  }

  @Override public String getStringFormTarget() {
    return typeLocator.getStringFormTarget() + "#" + methodName
        + "(" + parameterMatcher.toStringForm() + ")";
  }

  @Override
  public String toString() {
    return "MethodLocator{" +
        "typeLocator=" + typeLocator +
        ", methodName='" + methodName + '\'' +
        ", parameterMatcher=" + parameterMatcher +
        '}';
  }
}