Java tutorial
/* * This code is distributed under The GNU Lesser General Public License (LGPLv3) * Please visit GNU site for LGPLv3 http://www.gnu.org/copyleft/lesser.html * * Copyright Denis Pavlov 2009 * Web: http://www.genericdtoassembler.org * SVN: https://svn.code.sf.net/p/geda-genericdto/code/trunk/ * SVN (mirror): http://geda-genericdto.googlecode.com/svn/trunk/ */ package com.inspiresoftware.lib.dto.geda.interceptor; import com.inspiresoftware.lib.dto.geda.DTOSupport; import com.inspiresoftware.lib.dto.geda.annotations.Occurrence; import com.inspiresoftware.lib.dto.geda.config.GeDAInfrastructure; import org.aopalliance.intercept.MethodInterceptor; import org.aopalliance.intercept.MethodInvocation; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.util.CollectionUtils; import java.lang.reflect.Method; import java.util.Collection; import java.util.Map; /** * The workhorse of the whole enterprise - interceptor that will use dto support facade * in order to enrich DTO/Entities whist method invocation takes place. * <p/> * User: denispavlov * Date: Jan 25, 2012 * Time: 8:03:32 PM */ public class GeDAInterceptor implements MethodInterceptor, GeDAInfrastructure { private static final Logger LOG = LoggerFactory.getLogger(GeDAInterceptor.class); private DTOSupport support; private AdviceConfigResolver resolver; public GeDAInterceptor() { } public void setSupport(final DTOSupport support) { this.support = support; } public void setResolver(final AdviceConfigResolver resolver) { this.resolver = resolver; } /** {@inheritDoc} */ public Object invoke(final MethodInvocation invocation) throws Throwable { final Method method = invocation.getMethod(); final Class<?> targetClass = (invocation.getThis() != null ? invocation.getThis().getClass() : null); final Map<Occurrence, AdviceConfig> cfg = this.resolver.resolve(method, targetClass); if (CollectionUtils.isEmpty(cfg)) { if (LOG.isDebugEnabled()) { LOG.debug("skipping method {} because it is not advised", invocation.getMethod()); } return invocation.proceed(); // unadvised } final Object[] args = invocation.getArguments(); if (cfg.containsKey(Occurrence.BEFORE_METHOD_INVOCATION)) { final AdviceConfig configuration = cfg.get(Occurrence.BEFORE_METHOD_INVOCATION); if (LOG.isDebugEnabled()) { LOG.debug("performing transfer in mode {} before invocation of {} ", configuration.getDtoSupportMode().name(), invocation.getMethod()); } this.invokeTransferBefore(args, configuration); } final Object result = invocation.proceed(); if (cfg.containsKey(Occurrence.AFTER_METHOD_INVOCATION)) { final AdviceConfig configuration = cfg.get(Occurrence.AFTER_METHOD_INVOCATION); if (LOG.isDebugEnabled()) { LOG.debug("performing transfer in mode {} after invocation of {}", configuration.getDtoSupportMode().name(), invocation.getMethod()); } return this.invokeTransferAfter(args, result, configuration); } return result; } /** * Perform actual assembly of the DTO/Entity * * @param args current invocation arguments * @param cfg configuration mode */ protected void invokeTransferBefore(final Object[] args, final AdviceConfig cfg) { final AdviceConfig.DTOSupportMode mode = cfg.getDtoSupportMode(); switch (mode) { case DTO_TO_ENTITY: this.support.assembleEntity(args[cfg.getDtoSourceIndex()], args[cfg.getEntityTargetIndex()], cfg.getContext()); break; case DTO_TO_ENTITY_KEY: this.support.assembleEntityByKey(args[cfg.getDtoSourceIndex()], cfg.getEntityKey(), cfg.getContext()); break; case DTO_BY_FILTER_TO_ENTITY: this.support.assembleEntity(cfg.getDtoFilterKey(), args[cfg.getDtoSourceIndex()], args[cfg.getEntityTargetIndex()], cfg.getContext()); break; case DTO_BY_FILTER_TO_ENTITY_KEY: this.support.assembleEntityByKey(cfg.getDtoFilterKey(), args[cfg.getDtoSourceIndex()], cfg.getEntityKey(), cfg.getContext()); break; case DTOS_TO_ENTITIES: this.support.assembleEntities(cfg.getEntityKey(), (Collection) args[cfg.getDtoSourceIndex()], (Collection) args[cfg.getEntityTargetIndex()], cfg.getContext()); break; case DTOS_TO_ENTITIES_BY_FILTER: this.support.assembleEntities(cfg.getDtoFilterKey(), cfg.getEntityKey(), (Collection) args[cfg.getDtoSourceIndex()], (Collection) args[cfg.getEntityTargetIndex()], cfg.getContext()); break; case ENTITY_TO_DTO: this.support.assembleDto(args[cfg.getDtoTargetIndex()], args[cfg.getEntitySourceIndex()], cfg.getContext()); break; case ENTITY_TO_DTO_KEY: this.support.assembleDtoByKey(cfg.getDtoKey(), args[cfg.getEntitySourceIndex()], cfg.getContext()); break; case ENTITY_TO_DTO_BY_FILTER: this.support.assembleDto(cfg.getDtoFilterKey(), args[cfg.getDtoTargetIndex()], args[cfg.getEntitySourceIndex()], cfg.getContext()); break; case ENTITY_TO_DTO_KEY_BY_FILTER: this.support.assembleDtoByKey(cfg.getDtoFilterKey(), cfg.getDtoKey(), args[cfg.getEntitySourceIndex()], cfg.getContext()); break; case ENTITIES_TO_DTOS: this.support.assembleDtos(cfg.getDtoKey(), (Collection) args[cfg.getDtoTargetIndex()], (Collection) args[cfg.getEntitySourceIndex()], cfg.getContext()); break; case ENTITIES_TO_DTOS_BY_FILTER: this.support.assembleDtos(cfg.getDtoFilterKey(), cfg.getDtoKey(), (Collection) args[cfg.getDtoTargetIndex()], (Collection) args[cfg.getEntitySourceIndex()], cfg.getContext()); break; default: LOG.warn("Unknown support mode [{}]", cfg); break; } } /** * Perform actual assembly of the DTO/Entity * * @param args current invocation arguments * @param result result of the method invocation * @param cfg configuration mode */ protected Object invokeTransferAfter(final Object[] args, final Object result, final AdviceConfig cfg) { final AdviceConfig.DTOSupportMode mode = cfg.getDtoSupportMode(); switch (mode) { case DTO_TO_ENTITY: if (cfg.getEntityTargetIndex() == -1) { return this.support.assembleEntity(args[cfg.getDtoSourceIndex()], result, cfg.getContext()); } else { this.support.assembleEntity(args[cfg.getDtoSourceIndex()], args[cfg.getEntityTargetIndex()], cfg.getContext()); return result; } case DTO_TO_ENTITY_KEY: return this.support.assembleEntityByKey(args[cfg.getDtoSourceIndex()], cfg.getEntityKey(), cfg.getContext()); case DTO_BY_FILTER_TO_ENTITY: if (cfg.getEntityTargetIndex() == -1) { return this.support.assembleEntity(cfg.getDtoFilterKey(), args[cfg.getDtoSourceIndex()], result, cfg.getContext()); } else { this.support.assembleEntity(cfg.getDtoFilterKey(), args[cfg.getDtoSourceIndex()], args[cfg.getEntityTargetIndex()], cfg.getContext()); return result; } case DTO_BY_FILTER_TO_ENTITY_KEY: return this.support.assembleEntityByKey(cfg.getDtoFilterKey(), args[cfg.getDtoSourceIndex()], cfg.getEntityKey(), cfg.getContext()); case DTOS_TO_ENTITIES: this.support.assembleEntities(cfg.getEntityKey(), (Collection) args[cfg.getDtoSourceIndex()], (Collection) args[cfg.getEntityTargetIndex()], cfg.getContext()); return result; case DTOS_TO_ENTITIES_BY_FILTER: this.support.assembleEntities(cfg.getDtoFilterKey(), cfg.getEntityKey(), (Collection) args[cfg.getDtoSourceIndex()], (Collection) args[cfg.getEntityTargetIndex()], cfg.getContext()); return result; case ENTITY_TO_DTO: if (cfg.getDtoTargetIndex() == -1) { return this.support.assembleDto(result, args[cfg.getEntitySourceIndex()], cfg.getContext()); } else { this.support.assembleDto(args[cfg.getDtoTargetIndex()], args[cfg.getEntitySourceIndex()], cfg.getContext()); return result; } case ENTITY_TO_DTO_KEY: return this.support.assembleDtoByKey(cfg.getDtoKey(), args[cfg.getEntitySourceIndex()], cfg.getContext()); case ENTITY_TO_DTO_BY_FILTER: if (cfg.getDtoTargetIndex() == -1) { return this.support.assembleDto(cfg.getDtoFilterKey(), result, args[cfg.getEntitySourceIndex()], cfg.getContext()); } else { this.support.assembleDto(cfg.getDtoFilterKey(), args[cfg.getDtoTargetIndex()], args[cfg.getEntitySourceIndex()], cfg.getContext()); return result; } case ENTITY_TO_DTO_KEY_BY_FILTER: return this.support.assembleDtoByKey(cfg.getDtoFilterKey(), cfg.getDtoKey(), args[cfg.getEntitySourceIndex()], cfg.getContext()); case ENTITIES_TO_DTOS: this.support.assembleDtos(cfg.getDtoKey(), (Collection) args[cfg.getDtoTargetIndex()], (Collection) args[cfg.getEntitySourceIndex()], cfg.getContext()); return result; case ENTITIES_TO_DTOS_BY_FILTER: this.support.assembleDtos(cfg.getDtoFilterKey(), cfg.getDtoKey(), (Collection) args[cfg.getDtoTargetIndex()], (Collection) args[cfg.getEntitySourceIndex()], cfg.getContext()); return result; default: LOG.warn("Unknown support mode [{}]", cfg); return result; } } }