/*-
 * #%L
 * AEM Rules for SonarQube
 * %%
 * Copyright (C) 2015-2019 Cognifide Limited
 * %%
 * 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.
 * #L%
 */
package com.cognifide.aemrules.java.checks.visitors;

import java.util.ArrayList;
import java.util.List;

import org.sonar.plugins.java.api.tree.BaseTreeVisitor;
import org.sonar.plugins.java.api.tree.MethodTree;
import org.sonar.plugins.java.api.tree.TryStatementTree;
import org.sonar.plugins.java.api.tree.VariableTree;

/**
 * Finds all injector variable declarations. Used in method's bodies only.
 */
public class FindVariableDeclarationVisitor extends BaseTreeVisitor {

    private final List<VariableTree> variables;

    private final String variableTypeName;

    public FindVariableDeclarationVisitor(String variableTypeName) {
        this.variableTypeName = variableTypeName;
        this.variables = new ArrayList<>();
    }

    public List<VariableTree> getDeclarations() {
        return variables;
    }

    @Override
    public void visitVariable(VariableTree variable) {
        if (isInjector(variable)) {
            variables.add(variable);
        }
        super.visitVariable(variable);
    }

    private boolean isInjector(VariableTree tree) {
        return tree.type().symbolType().fullyQualifiedName().equals(variableTypeName);
    }

    @Override
    public void visitMethod(MethodTree tree) {
        // omit all apart from block
        scan(tree.block());
    }

    @Override
    public void visitTryStatement(TryStatementTree tree) {
        // omit resources
        scan(tree.block());
        scan(tree.catches());
        scan(tree.finallyBlock());
    }
}