--- /dev/null
+/*\r
+ * Copyright (C) 2007-2012 Argeo GmbH\r
+ *\r
+ * Licensed under the Apache License, Version 2.0 (the "License");\r
+ * you may not use this file except in compliance with the License.\r
+ * You may obtain a copy of the License at\r
+ *\r
+ * http://www.apache.org/licenses/LICENSE-2.0\r
+ *\r
+ * Unless required by applicable law or agreed to in writing, software\r
+ * distributed under the License is distributed on an "AS IS" BASIS,\r
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+ * See the License for the specific language governing permissions and\r
+ * limitations under the License.\r
+ */\r
+package org.argeo.slc.core.execution;\r
+\r
+import java.beans.PropertyDescriptor;\r
+import java.util.HashSet;\r
+import java.util.Iterator;\r
+import java.util.List;\r
+import java.util.Map;\r
+import java.util.Set;\r
+\r
+import org.apache.commons.logging.Log;\r
+import org.apache.commons.logging.LogFactory;\r
+import org.argeo.slc.SlcException;\r
+import org.argeo.slc.execution.ExecutionContext;\r
+import org.argeo.slc.execution.ExecutionFlow;\r
+import org.springframework.beans.BeansException;\r
+import org.springframework.beans.MutablePropertyValues;\r
+import org.springframework.beans.PropertyValue;\r
+import org.springframework.beans.PropertyValues;\r
+import org.springframework.beans.factory.BeanDefinitionStoreException;\r
+import org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessorAdapter;\r
+import org.springframework.beans.factory.config.TypedStringValue;\r
+import org.springframework.beans.factory.support.ManagedList;\r
+import org.springframework.beans.factory.support.ManagedMap;\r
+import org.springframework.beans.factory.support.ManagedSet;\r
+import org.springframework.util.ObjectUtils;\r
+import org.springframework.util.StringUtils;\r
+\r
+/**\r
+ * Spring post processor which ensures that execution parameters are properly\r
+ * set. It is used at two levels: first during instantiation for instantiation\r
+ * parameters which allow to implement templates, then at runtime in order to\r
+ * interpret @{} placeholders when object of scope execution are instantiated.\r
+ */\r
+public class ExecutionParameterPostProcessor extends\r
+ InstantiationAwareBeanPostProcessorAdapter {\r
+\r
+ private final static Log log = LogFactory\r
+ .getLog(ExecutionParameterPostProcessor.class);\r
+\r
+ private ExecutionContext executionContext;\r
+ private InstantiationManager instantiationManager;\r
+\r
+ private String placeholderPrefix = "@{";\r
+ private String placeholderSuffix = "}";\r
+ private String nullValue;\r
+\r
+ @Override\r
+ public PropertyValues postProcessPropertyValues(PropertyValues pvs,\r
+ PropertyDescriptor[] pds, Object bean, String beanName)\r
+ throws BeansException {\r
+\r
+ // TODO: resolve at execution only if scope is execution\r
+ // TODO: deal with placeholders in RuntimeBeanReference and\r
+ // RuntimeBeanNameReference\r
+\r
+ MutablePropertyValues newPvs = new MutablePropertyValues();\r
+\r
+ boolean changesOccured = false;\r
+\r
+ for (PropertyValue pv : pvs.getPropertyValues()) {\r
+ Object convertedValue = resolveValue(beanName, bean, pv.getValue());\r
+ newPvs.addPropertyValue(new PropertyValue(pv, convertedValue));\r
+ if (convertedValue != pv.getValue()) {\r
+ changesOccured = true;\r
+ }\r
+ }\r
+\r
+ return changesOccured ? newPvs : pvs;\r
+ }\r
+\r
+ @Override\r
+ public boolean postProcessAfterInstantiation(Object bean, String beanName)\r
+ throws BeansException {\r
+ if (bean instanceof ExecutionFlow)\r
+ instantiationManager.flowInitializationStarted(\r
+ (ExecutionFlow) bean, beanName);\r
+ return true;\r
+ }\r
+\r
+ @Override\r
+ public Object postProcessAfterInitialization(Object bean, String beanName)\r
+ throws BeansException {\r
+ if (bean instanceof ExecutionFlow)\r
+ instantiationManager.flowInitializationFinished(\r
+ (ExecutionFlow) bean, beanName);\r
+ return bean;\r
+ }\r
+\r
+ protected String resolvePlaceholder(Object bean, String placeholder) {\r
+ if (instantiationManager.isInFlowInitialization())\r
+ return instantiationManager.getInitializingFlowParameter(\r
+ placeholder).toString();\r
+\r
+ else {// execution\r
+ // next call fail if no execution context available\r
+ Object obj = executionContext.getVariable(placeholder);\r
+ if (obj != null) {\r
+ return obj.toString();\r
+ }\r
+ }\r
+\r
+ return null;\r
+ }\r
+\r
+ public Object resolveValue(String beanName, Object bean, Object value) {\r
+ if (value instanceof TypedStringValue) {\r
+ TypedStringValue tsv = (TypedStringValue) value;\r
+ String originalValue = tsv.getValue();\r
+\r
+ String convertedValue = resolveString(beanName, bean, originalValue);\r
+ if (convertedValue == null)\r
+ return null;\r
+ return convertedValue.equals(originalValue) ? value\r
+ : new TypedStringValue(convertedValue);\r
+ } else if (value instanceof String) {\r
+ String originalValue = value.toString();\r
+ String convertedValue = resolveString(beanName, bean, originalValue);\r
+ if (convertedValue == null)\r
+ return null;\r
+ return convertedValue.equals(originalValue) ? value\r
+ : convertedValue;\r
+ } else if (value instanceof ManagedMap) {\r
+ Map<?, ?> mapVal = (Map<?, ?>) value;\r
+\r
+ Map<Object, Object> newContent = new ManagedMap<Object, Object>();\r
+ boolean entriesModified = false;\r
+ for (Iterator<?> it = mapVal.entrySet().iterator(); it.hasNext();) {\r
+ Map.Entry<?, ?> entry = (Map.Entry<?, ?>) it.next();\r
+ Object key = entry.getKey();\r
+ int keyHash = (key != null ? key.hashCode() : 0);\r
+ Object newKey = resolveValue(beanName, bean, key);\r
+ int newKeyHash = (newKey != null ? newKey.hashCode() : 0);\r
+ Object val = entry.getValue();\r
+ Object newVal = resolveValue(beanName, bean, val);\r
+ newContent.put(newKey, newVal);\r
+ entriesModified = entriesModified\r
+ || (newVal != val || newKey != key || newKeyHash != keyHash);\r
+ }\r
+\r
+ return entriesModified ? newContent : value;\r
+ } else if (value instanceof ManagedList) {\r
+ List<?> listVal = (List<?>) value;\r
+ List<Object> newContent = new ManagedList<Object>();\r
+ boolean valueModified = false;\r
+\r
+ for (int i = 0; i < listVal.size(); i++) {\r
+ Object elem = listVal.get(i);\r
+ Object newVal = resolveValue(beanName, bean, elem);\r
+ newContent.add(newVal);\r
+ if (!ObjectUtils.nullSafeEquals(newVal, elem)) {\r
+ valueModified = true;\r
+ }\r
+ }\r
+ return valueModified ? newContent : value;\r
+ } else if (value instanceof ManagedSet) {\r
+ Set<?> setVal = (Set<?>) value;\r
+ Set<Object> newContent = new ManagedSet<Object>();\r
+ boolean entriesModified = false;\r
+ for (Iterator<?> it = setVal.iterator(); it.hasNext();) {\r
+ Object elem = it.next();\r
+ int elemHash = (elem != null ? elem.hashCode() : 0);\r
+ Object newVal = resolveValue(beanName, bean, elem);\r
+ int newValHash = (newVal != null ? newVal.hashCode() : 0);\r
+ newContent.add(newVal);\r
+ entriesModified = entriesModified\r
+ || (newVal != elem || newValHash != elemHash);\r
+ }\r
+ return entriesModified ? newContent : value;\r
+ } else {\r
+ // log.debug(beanName + ": " + value.getClass() + " : " + value);\r
+ return value;\r
+ }\r
+\r
+ }\r
+\r
+ private String resolveString(String beanName, Object bean, String strVal) {\r
+ // in case <null/> is passed\r
+ if (strVal == null)\r
+ return null;\r
+\r
+ String value = parseStringValue(bean, strVal, new HashSet<String>());\r
+\r
+ if (value == null)\r
+ throw new SlcException("Could not resolve placeholder '" + strVal\r
+ + "' in bean '" + beanName + "'");\r
+\r
+ return (value.equals(nullValue) ? null : value);\r
+ }\r
+\r
+ public void setPlaceholderPrefix(String placeholderPrefix) {\r
+ this.placeholderPrefix = placeholderPrefix;\r
+ }\r
+\r
+ public void setPlaceholderSuffix(String placeholderSuffix) {\r
+ this.placeholderSuffix = placeholderSuffix;\r
+ }\r
+\r
+ public void setNullValue(String nullValue) {\r
+ this.nullValue = nullValue;\r
+ }\r
+\r
+ public void setInstantiationManager(\r
+ InstantiationManager instantiationManager) {\r
+ this.instantiationManager = instantiationManager;\r
+ }\r
+\r
+ public void setExecutionContext(ExecutionContext executionContext) {\r
+ this.executionContext = executionContext;\r
+ }\r
+\r
+ //\r
+ // Following methods hacked from the internals of\r
+ // PropertyPlaceholderConfigurer\r
+ //\r
+\r
+ protected String parseStringValue(Object bean, String strVal,\r
+ Set<String> visitedPlaceholders)\r
+ throws BeanDefinitionStoreException {\r
+\r
+ // in case <null/> is passed\r
+ if (strVal == null)\r
+ return null;\r
+\r
+ StringBuffer buf = new StringBuffer(strVal);\r
+\r
+ int startIndex = strVal.indexOf(placeholderPrefix);\r
+ while (startIndex != -1) {\r
+ int endIndex = findPlaceholderEndIndex(buf, startIndex);\r
+ if (endIndex != -1) {\r
+ String placeholder = buf.substring(startIndex\r
+ + placeholderPrefix.length(), endIndex);\r
+ if (!visitedPlaceholders.add(placeholder)) {\r
+ throw new BeanDefinitionStoreException(\r
+ "Circular placeholder reference '" + placeholder\r
+ + "' in property definitions");\r
+ }\r
+ // Recursive invocation, parsing placeholders contained in\r
+ // the placeholder key.\r
+ placeholder = parseStringValue(bean, placeholder,\r
+ visitedPlaceholders);\r
+ // Now obtain the value for the fully resolved key...\r
+ String propVal = resolvePlaceholder(bean, placeholder);\r
+ if (propVal != null) {\r
+ // Recursive invocation, parsing placeholders contained\r
+ // in the\r
+ // previously resolved placeholder value.\r
+ propVal = parseStringValue(bean, propVal,\r
+ visitedPlaceholders);\r
+ buf.replace(startIndex,\r
+ endIndex + placeholderSuffix.length(), propVal);\r
+ if (log.isTraceEnabled()) {\r
+ log.trace("Resolved placeholder '" + placeholder + "'");\r
+ }\r
+ startIndex = buf.indexOf(placeholderPrefix, startIndex\r
+ + propVal.length());\r
+ } else {\r
+ throw new BeanDefinitionStoreException(\r
+ "Could not resolve placeholder '" + placeholder\r
+ + "'");\r
+ }\r
+ visitedPlaceholders.remove(placeholder);\r
+ } else {\r
+ startIndex = -1;\r
+ }\r
+ }\r
+\r
+ return buf.toString();\r
+ }\r
+\r
+ private int findPlaceholderEndIndex(CharSequence buf, int startIndex) {\r
+ int index = startIndex + placeholderPrefix.length();\r
+ int withinNestedPlaceholder = 0;\r
+ while (index < buf.length()) {\r
+ if (StringUtils.substringMatch(buf, index, placeholderSuffix)) {\r
+ if (withinNestedPlaceholder > 0) {\r
+ withinNestedPlaceholder--;\r
+ index = index + placeholderSuffix.length();\r
+ } else {\r
+ return index;\r
+ }\r
+ } else if (StringUtils\r
+ .substringMatch(buf, index, placeholderPrefix)) {\r
+ withinNestedPlaceholder++;\r
+ index = index + placeholderPrefix.length();\r
+ } else {\r
+ index++;\r
+ }\r
+ }\r
+ return -1;\r
+ }\r
+\r
+}\r
projects / gpl / argeo-slc.git / blobdiff