content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.camel.language.csimple.joor;
  
  import java.util.Map;
  import java.util.Optional;
  import java.util.Set;
  import java.util.TreeSet;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.apache.camel.CamelContext;
  import org.apache.camel.CamelContextAware;
  import org.apache.camel.StaticService;
  import org.apache.camel.language.csimple.CSimpleCodeGenerator;
  import org.apache.camel.language.csimple.CSimpleCompiler;
  import org.apache.camel.language.csimple.CSimpleExpression;
  import org.apache.camel.language.csimple.CSimpleGeneratedCode;
  import org.apache.camel.spi.SimpleLanguageFunctionFactory;
  import org.apache.camel.spi.annotations.JdkService;
  import org.apache.camel.support.ResolverHelper;
  import org.apache.camel.support.ScriptHelper;
  import org.apache.camel.support.service.ServiceSupport;
  import org.apache.camel.util.StopWatch;
  import org.apache.camel.util.TimeUtils;
  import org.joor.Reflect;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * jOOR compiler for csimple language.
   */
  @JdkService(CSimpleCompiler.FACTORY)
  public class JoorCSimpleCompiler extends ServiceSupport implements CSimpleCompiler, CamelContextAware, StaticService {
  
      private static final Logger LOG = LoggerFactory.getLogger(JoorCSimpleCompiler.class);
      private static final AtomicInteger UUID = new AtomicInteger();
      private CamelContext camelContext;
      private Set<String> imports = new TreeSet<>();
      private Map<String, String> aliases;
      private int counter;
      private long taken;
  
      @Override
      public CamelContext getCamelContext() {
          return camelContext;
      }
  
      @Override
      public void setCamelContext(CamelContext camelContext) {
          this.camelContext = camelContext;
      }
  
      public Set<String> getImports() {
          return imports;
      }
  
      public void setImports(Set<String> imports) {
          this.imports = imports;
      }
  
      public Map<String, String> getAliases() {
          return aliases;
      }
  
      public void setAliases(Map<String, String> aliases) {
          this.aliases = aliases;
      }
  
      @Override
      public void addImport(String imports) {
          this.imports.add(imports);
      }
  
      @Override
      public void addAliases(String key, String value) {
          this.aliases.put(key, value);
      }
  
      @Override
      public CSimpleExpression compileExpression(CamelContext camelContext, String script) {
          return doCompile(camelContext, script, false);
      }
  
      @Override
      public CSimpleExpression compilePredicate(CamelContext camelContext, String script) {
          return doCompile(camelContext, script, true);
      }
  
      private CSimpleExpression doCompile(CamelContext camelContext, String script, boolean predicate) {
          StopWatch watch = new StopWatch();
  
          CSimpleExpression answer;
          String className = nextFQN();
          CSimpleGeneratedCode code;
          if (predicate) {
              code = evalCodePredicate(camelContext, className, script);
          } else {
              code = evalCodeExpression(camelContext, className, script);
          }
          try {
              if (LOG.isDebugEnabled()) {
                  LOG.debug("Compiling code:\n\n{}\n", code.getCode());
              }
              Reflect ref = Reflect.compile(code.getFqn(), code.getCode());
              Class<?> clazz = ref.type();
              answer = (CSimpleExpression) clazz.getConstructor().newInstance();
          } catch (Exception e) {
              throw new JoorCSimpleCompilationException(code.getFqn(), code.getCode(), e);
          }
  
          counter++;
          taken += watch.taken();
          return answer;
      }
  
      private CSimpleGeneratedCode evalCodeExpression(CamelContext camelContext, String fqn, String script) {
          return doEvalCode(camelContext, fqn, script, false);
      }
  
      private CSimpleGeneratedCode evalCodePredicate(CamelContext camelContext, String fqn, String script) {
          return doEvalCode(camelContext, fqn, script, true);
      }
  
      private CSimpleGeneratedCode doEvalCode(CamelContext camelContext, String fqn, String script, boolean predicate) {
          // reload script
          script = ScriptHelper.resolveOptionalExternalScript(camelContext, script);
          // trim text
          script = script.trim();
  
          CSimpleCodeGenerator generator = new CSimpleCodeGenerator();
          generator.setCamelContext(camelContext);
          if (aliases != null && !aliases.isEmpty()) {
              generator.setAliases(aliases);
          }
          if (imports != null && !imports.isEmpty()) {
              generator.setImports(imports);
          }
  
          CSimpleGeneratedCode code;
          if (predicate) {
              code = generator.generatePredicate(fqn, script);
          } else {
              code = generator.generateExpression(fqn, script);
          }
  
          return code;
      }
  
      private static String nextFQN() {
          return "org.apache.camel.language.csimple.joor.compiled.CSimpleJoorScript" + UUID.incrementAndGet();
      }
  
      @Override
      protected void doStart() throws Exception {
          // check if camel-attachment is on classpath which then includes custom csimple functions
          if (camelContext != null) {
              Optional<SimpleLanguageFunctionFactory> factory = ResolverHelper.resolveService(
                      camelContext,
                      camelContext.getCamelContextExtension().getBootstrapFactoryFinder(),
                      SimpleLanguageFunctionFactory.FACTORY + "/camel-attachments",
                      SimpleLanguageFunctionFactory.class);
              if (factory.isPresent()) {
                  addImport("import static org.apache.camel.attachment.CSimpleAttachmentHelper.*");
              }
          }
      }
  
      @Override
      protected void doStop() throws Exception {
          super.doStop();
          if (counter > 0) {
              LOG.info("csimple-joor compiled {} scripts in {}", counter, TimeUtils.printDuration(taken, true));
          }
      }
  
  }
  