diff options
Diffstat (limited to 'eaaf_core/src/main/java/at/gv/egiz/eaaf/core/impl/idp/process/springweb/SpringWebExpressionEvaluator.java')
| -rw-r--r-- | eaaf_core/src/main/java/at/gv/egiz/eaaf/core/impl/idp/process/springweb/SpringWebExpressionEvaluator.java | 227 |
1 files changed, 96 insertions, 131 deletions
diff --git a/eaaf_core/src/main/java/at/gv/egiz/eaaf/core/impl/idp/process/springweb/SpringWebExpressionEvaluator.java b/eaaf_core/src/main/java/at/gv/egiz/eaaf/core/impl/idp/process/springweb/SpringWebExpressionEvaluator.java index 5ebc1b58..afcc0a58 100644 --- a/eaaf_core/src/main/java/at/gv/egiz/eaaf/core/impl/idp/process/springweb/SpringWebExpressionEvaluator.java +++ b/eaaf_core/src/main/java/at/gv/egiz/eaaf/core/impl/idp/process/springweb/SpringWebExpressionEvaluator.java @@ -1,43 +1,31 @@ -/******************************************************************************* - * Copyright 2017 Graz University of Technology - * EAAF-Core Components has been developed in a cooperation between EGIZ, - * A-SIT Plus, A-SIT, and Graz University of Technology. +/* + * Copyright 2017 Graz University of Technology EAAF-Core Components has been developed in a + * cooperation between EGIZ, A-SIT Plus, A-SIT, and Graz University of Technology. * - * Licensed under the EUPL, Version 1.2 or - as soon they will be approved by - * the European Commission - subsequent versions of the EUPL (the "Licence"); - * You may not use this work except in compliance with the Licence. - * You may obtain a copy of the Licence at: + * Licensed under the EUPL, Version 1.2 or - as soon they will be approved by the European + * Commission - subsequent versions of the EUPL (the "Licence"); You may not use this work except in + * compliance with the Licence. You may obtain a copy of the Licence at: * https://joinup.ec.europa.eu/news/understanding-eupl-v12 * - * Unless required by applicable law or agreed to in writing, software - * distributed under the Licence is distributed on an "AS IS" basis, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the Licence for the specific language governing permissions and - * limitations under the Licence. - * - * This product combines work with different licenses. See the "NOTICE" text - * file for details on the various modules and licenses. - * The "NOTICE" text file is part of the distribution. Any derivative works - * that you distribute must include a readable copy of the "NOTICE" text file. - *******************************************************************************/ -/******************************************************************************* - *******************************************************************************/ -/******************************************************************************* - *******************************************************************************/ + * Unless required by applicable law or agreed to in writing, software distributed under the Licence + * is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express + * or implied. See the Licence for the specific language governing permissions and limitations under + * the Licence. + * + * This product combines work with different licenses. See the "NOTICE" text file for details on the + * various modules and licenses. The "NOTICE" text file is part of the distribution. Any derivative + * works that you distribute must include a readable copy of the "NOTICE" text file. +*/ + package at.gv.egiz.eaaf.core.impl.idp.process.springweb; import java.io.Serializable; -import java.util.Collections; -import java.util.HashMap; -import java.util.Iterator; import java.util.Map; -import java.util.Map.Entry; import java.util.Objects; import javax.annotation.PostConstruct; import javax.servlet.http.HttpServletRequest; -import org.apache.commons.lang3.ArrayUtils; import org.apache.commons.lang3.BooleanUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; @@ -55,115 +43,92 @@ import at.gv.egiz.eaaf.core.api.idp.process.ExpressionEvaluator; import at.gv.egiz.eaaf.core.impl.idp.process.model.Transition; /** - * Expression evaluator for processing {@link Transition} conditions allowing to + * Expression evaluator for processing {@link Transition} conditions allowing + * to. * <ul> - * <li>reference Spring beans from the application context using {@code @myBeanName...},</li> + * <li>reference Spring beans from the application context using + * {@code @myBeanName...},</li> * <li>{@link ExecutionContext} properties using {@code ctx['property']},</li> - * <li>Multi valued {@link HttpServletRequest} parameters using {@code requestParameters['foo']} (keep in mind that this - * expression returns an array of String values) and</li> - * <li>Single valued {@link HttpServletRequest} parameters using {@code requestParameter['foo']}</li> + * <li>Multi valued {@link HttpServletRequest} parameters using + * {@code requestParameters['foo']} (keep in mind that this expression returns + * an array of String values) and</li> + * <li>Single valued {@link HttpServletRequest} parameters using + * {@code requestParameter['foo']}</li> * </ul> - * + * * @author tknall - * + * */ public class SpringWebExpressionEvaluator implements ExpressionEvaluator { - private Logger log = LoggerFactory.getLogger(getClass()); - private ExpressionParser parser = new SpelExpressionParser(); - private StandardEvaluationContext evaluationContext = new StandardEvaluationContext(); - - @Autowired(required = false) - private ApplicationContext ctx; - - @Autowired(required = false) - private HttpServletRequest request; - - @PostConstruct - private void init() { - if (ctx != null) { - evaluationContext.setBeanResolver(new BeanFactoryResolver(ctx)); - } - } - - /** - * Evaluation context that provides access to {@link HttpServletRequest} parameters using - * {@code requestParameter['foo']} for single value parameters or {@code requestParameters['foo']} for multi value - * parameters. Basic calls to {@code ctx} will be delegated. - * - * @author tknall - * - */ - private class SpringWebExpressionEvaluationContext implements ExpressionEvaluationContext { - - private static final long serialVersionUID = 1L; - - /** - * Creates a new expression evaluation context, providing access to HttpServletRequest parameter(s). - * - * @param delegate - * The original {@link ExpressionEvaluationContext} to be delegated to for {@code ctx['foo']} - * expressions. - */ - public SpringWebExpressionEvaluationContext(ExpressionEvaluationContext delegate) { - this.delegate = delegate; - } - - private ExpressionEvaluationContext delegate; - - @Override - public Map<String, Serializable> getCtx() { - return delegate.getCtx(); - } - - @SuppressWarnings("unused") - public Map<String, String> getRequestParameter() { - if (request != null) { - Map<String, String> singleValueMap = new HashMap<String, String>(); - Iterator<Entry<String, String[]>> it = request.getParameterMap().entrySet().iterator(); - while (it.hasNext()) { - Entry<String, String[]> entry = it.next(); - if (ArrayUtils.isNotEmpty(entry.getValue())) { - singleValueMap.put(entry.getKey(), entry.getValue()[0]); - } - } - return singleValueMap; - } else { - return Collections.<String, String> emptyMap(); - } - } - - @SuppressWarnings("unused") - public Map<String, String[]> getRequestParameters() { - if (request != null) { - return request.getParameterMap(); - } else { - return Collections.<String, String[]> emptyMap(); - } - } - - } - - @Override - public boolean evaluate(ExpressionEvaluationContext expressionContext, String expression) { - Objects.requireNonNull(expression, "Expression must not be null."); - log.trace("Evaluating '{}'.", expression); - - Expression expr = parser.parseExpression(expression); - Boolean result = null; - try { - result = expr.getValue(evaluationContext, new SpringWebExpressionEvaluationContext(expressionContext), - Boolean.class); - if (result == null) { - log.debug("Evaluation of '{}' results in null-value.", expression); - } else { - log.debug("Expression '{}' -> {}", expression, result); - } - } catch (Exception e) { - log.warn("Expression '{}' could not be processed.", expression, e); - } - - return BooleanUtils.isTrue(result); - } + private final Logger log = LoggerFactory.getLogger(getClass()); + private final ExpressionParser parser = new SpelExpressionParser(); + private final StandardEvaluationContext evaluationContext = new StandardEvaluationContext(); + + @Autowired(required = false) + private ApplicationContext ctx; + + @PostConstruct + private void init() { + if (ctx != null) { + evaluationContext.setBeanResolver(new BeanFactoryResolver(ctx)); + } + } + + /** + * Evaluation context that provides access to {@link HttpServletRequest} + * parameters using {@code requestParameter['foo']} for single value parameters + * or {@code requestParameters['foo']} for multi value parameters. Basic calls + * to {@code ctx} will be delegated. + * + * @author tknall + * + */ + private static class SpringWebExpressionEvaluationContext implements ExpressionEvaluationContext { + + private static final long serialVersionUID = 1L; + + /** + * Creates a new expression evaluation context, providing access to + * HttpServletRequest parameter(s). + * + * @param delegate The original {@link ExpressionEvaluationContext} to be + * delegated to for {@code ctx['foo']} expressions. + */ + public SpringWebExpressionEvaluationContext(final ExpressionEvaluationContext delegate) { + this.delegate = delegate; + } + + private final ExpressionEvaluationContext delegate; + + @Override + public Map<String, Serializable> getCtx() { + return delegate.getCtx(); + } + + } + + @Override + public boolean evaluate(final ExpressionEvaluationContext expressionContext, + final String expression) { + Objects.requireNonNull(expression, "Expression must not be null."); + log.trace("Evaluating '{}'.", expression); + + final Expression expr = parser.parseExpression(expression); + Boolean result = null; + try { + result = expr.getValue(evaluationContext, + new SpringWebExpressionEvaluationContext(expressionContext), Boolean.class); + if (result == null) { + log.debug("Evaluation of '{}' results in null-value.", expression); + } else { + log.debug("Expression '{}' -> {}", expression, result); + } + } catch (final Exception e) { + log.warn("Expression '{}' could not be processed.", expression, e); + } + + return BooleanUtils.isTrue(result); + } } |