| // 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 |
| // 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 com.cloud.utils.db; |
| |
| import java.lang.reflect.Method; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import net.sf.cglib.proxy.MethodInterceptor; |
| import net.sf.cglib.proxy.MethodProxy; |
| |
| import com.cloud.utils.Ternary; |
| import com.cloud.utils.exception.CloudRuntimeException; |
| |
| public class UpdateBuilder implements MethodInterceptor { |
| protected Map<String, Ternary<Attribute, Boolean, Object>> _changes; |
| protected HashMap<Attribute, Object> _collectionChanges; |
| protected GenericDaoBase<?, ?> _dao; |
| |
| protected UpdateBuilder(GenericDaoBase<?, ?> dao) { |
| _dao = dao; |
| _changes = new HashMap<String, Ternary<Attribute, Boolean, Object>>(); |
| } |
| |
| @Override |
| public Object intercept(Object object, Method method, Object[] args, MethodProxy methodProxy) throws Throwable { |
| String name = method.getName(); |
| if (name.startsWith("set")) { |
| String field = methodToField(name, 3); |
| makeChange(field, args[0]); |
| } else if (name.startsWith("incr")) { |
| makeIncrChange(name, args); |
| } else if (name.startsWith("decr")) { |
| makeDecrChange(name, args); |
| } |
| return methodProxy.invokeSuper(object, args); |
| } |
| |
| private final String methodToField(String method, int start) { |
| char[] chs = method.toCharArray(); |
| chs[start] = Character.toLowerCase(chs[start]); |
| return new String(chs, start, chs.length - start); |
| } |
| |
| protected Attribute makeChange(String field, Object value) { |
| Attribute attr = _dao._allAttributes.get(field); |
| |
| assert (attr == null || attr.isUpdatable()) : "Updating an attribute that's not updatable: " + field; |
| if (attr != null) { |
| if (attr.attache == null) { |
| _changes.put(field, new Ternary<Attribute, Boolean, Object>(attr, null, value)); |
| } else { |
| if (_collectionChanges == null) { |
| _collectionChanges = new HashMap<Attribute, Object>(); |
| } |
| _collectionChanges.put(attr, value); |
| } |
| } |
| return attr; |
| } |
| |
| protected void makeIncrChange(String method, Object[] args) { |
| String field = methodToField(method, 4); |
| Attribute attr = _dao._allAttributes.get(field); |
| assert (attr != null && attr.isUpdatable()) : "Updating an attribute that's not updatable: " + field; |
| incr(attr, args == null || args.length == 0 ? 1 : args[0]); |
| } |
| |
| protected void makeDecrChange(String method, Object[] args) { |
| String field = methodToField(method, 4); |
| Attribute attr = _dao._allAttributes.get(field); |
| assert (attr != null && attr.isUpdatable()) : "Updating an attribute that's not updatable: " + field; |
| decr(attr, args == null || args.length == 0 ? 1 : args[0]); |
| } |
| |
| public void set(Object entity, String name, Object value) { |
| Attribute attr = makeChange(name, value); |
| |
| set(entity, attr, value); |
| } |
| |
| public void set(Object entity, Attribute attr, Object value) { |
| _changes.put(attr.field.getName(), new Ternary<Attribute, Boolean, Object>(attr, null, value)); |
| try { |
| attr.field.set(entity, value); |
| } catch (IllegalArgumentException e) { |
| throw new CloudRuntimeException("Unable to update " + attr.field.getName() + " with " + value, e); |
| } catch (IllegalAccessException e) { |
| throw new CloudRuntimeException("Unable to update " + attr.field.getName() + " with " + value, e); |
| } |
| } |
| |
| public void incr(Attribute attr, Object value) { |
| _changes.put(attr.field.getName(), new Ternary<Attribute, Boolean, Object>(attr, true, value)); |
| } |
| |
| public void decr(Attribute attr, Object value) { |
| _changes.put(attr.field.getName(), new Ternary<Attribute, Boolean, Object>(attr, false, value)); |
| } |
| |
| public boolean hasChanges() { |
| return (_changes.size() + (_collectionChanges != null ? _collectionChanges.size() : 0)) != 0; |
| } |
| |
| public boolean has(String name) { |
| return _changes.containsKey(name); |
| } |
| |
| public Map<Attribute, Object> getCollectionChanges() { |
| return _collectionChanges; |
| } |
| |
| public void clear() { |
| _changes.clear(); |
| if (_collectionChanges != null) { |
| _collectionChanges.clear(); |
| _collectionChanges = null; |
| } |
| } |
| |
| public StringBuilder toSql(String tables) { |
| if (_changes.isEmpty()) { |
| return null; |
| } |
| |
| return SqlGenerator.buildMysqlUpdateSql(tables, _changes.values()); |
| } |
| |
| public Collection<Ternary<Attribute, Boolean, Object>> getChanges() { |
| return _changes.values(); |
| } |
| } |