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com.mysema.query.alias.PropertyAccessInvocationHandler Maven / Gradle / Ivy
/*
* Copyright 2011, Mysema Ltd
*
* Licensed 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 com.mysema.query.alias;
import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.Timestamp;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.Nullable;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
import com.google.common.collect.ImmutableList;
import com.mysema.query.types.Expression;
import com.mysema.query.types.ParametrizedExpression;
import com.mysema.query.types.Path;
import com.mysema.query.types.PathMetadata;
import com.mysema.query.types.PathMetadataFactory;
import com.mysema.util.BeanUtils;
import com.mysema.util.ReflectionUtils;
/**
* PropertyAccessInvocationHandler is the main InvocationHandler class for the
* CGLIB alias proxies
*
* @author tiwe
*/
public class PropertyAccessInvocationHandler implements MethodInterceptor {
private static final int RETURN_VALUE = 42;
private final Expression hostExpression;
private final AliasFactory aliasFactory;
private final Map> propToExpr = new HashMap>();
private final Map propToObj = new HashMap();
private final PathFactory pathFactory;
private final TypeSystem typeSystem;
public PropertyAccessInvocationHandler(Expression host, AliasFactory aliasFactory,
PathFactory pathFactory, TypeSystem typeSystem) {
this.hostExpression = host;
this.aliasFactory = aliasFactory;
this.pathFactory = pathFactory;
this.typeSystem = typeSystem;
}
//CHECKSTYLE:OFF
public Object intercept(Object proxy, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
//CHECKSTYLE:ON
Object rv = null;
MethodType methodType = MethodType.get(method);
if (methodType == MethodType.GETTER) {
String ptyName = propertyNameForGetter(method);
Class ptyClass = method.getReturnType();
Type genericType = method.getGenericReturnType();
if (propToObj.containsKey(ptyName)) {
rv = propToObj.get(ptyName);
} else {
PathMetadata pm = createPropertyPath((Path) hostExpression, ptyName);
rv = newInstance(ptyClass, genericType, proxy, ptyName, pm);
}
aliasFactory.setCurrent(propToExpr.get(ptyName));
} else if (methodType == MethodType.SCALA_GETTER) {
String ptyName = method.getName();
Class ptyClass = method.getReturnType();
Type genericType = method.getGenericReturnType();
if (propToObj.containsKey(ptyName)) {
rv = propToObj.get(ptyName);
} else {
PathMetadata pm = createPropertyPath((Path) hostExpression, ptyName);
rv = newInstance(ptyClass, genericType, proxy, ptyName, pm);
}
aliasFactory.setCurrent(propToExpr.get(ptyName));
} else if (methodType == MethodType.LIST_ACCESS || methodType == MethodType.SCALA_LIST_ACCESS) {
// TODO : manage cases where the argument is based on a property invocation
Object propKey = ImmutableList.of(MethodType.LIST_ACCESS, args[0]);
if (propToObj.containsKey(propKey)) {
rv = propToObj.get(propKey);
} else {
PathMetadata pm = createListAccessPath((Path) hostExpression, (Integer) args[0]);
Class elementType = ((ParametrizedExpression) hostExpression).getParameter(0);
rv = newInstance(elementType, elementType, proxy, propKey, pm);
}
aliasFactory.setCurrent(propToExpr.get(propKey));
} else if (methodType == MethodType.MAP_ACCESS || methodType == MethodType.SCALA_MAP_ACCESS) {
Object propKey = ImmutableList.of(MethodType.MAP_ACCESS, args[0]);
if (propToObj.containsKey(propKey)) {
rv = propToObj.get(propKey);
} else {
PathMetadata pm = createMapAccessPath((Path)hostExpression, args[0]);
Class valueType = ((ParametrizedExpression) hostExpression).getParameter(1);
rv = newInstance(valueType, valueType, proxy, propKey, pm);
}
aliasFactory.setCurrent(propToExpr.get(propKey));
} else if (methodType == MethodType.TO_STRING) {
rv = hostExpression.toString();
} else if (methodType == MethodType.HASH_CODE) {
rv = hostExpression.hashCode();
} else if (methodType == MethodType.GET_MAPPED_PATH) {
rv = hostExpression;
} else {
throw new IllegalArgumentException(
"Invocation of " + method.getName() +
" with types " + Arrays.asList(method.getParameterTypes()) + " not supported");
}
return rv;
}
@SuppressWarnings({ "unchecked"})
@Nullable
protected T newInstance(Class type, Type genericType, Object parent, Object propKey,
PathMetadata metadata) {
Expression path;
Object rv;
if (String.class.equals(type)) {
path = pathFactory.createStringPath(metadata);
// null is used as a return value to block method invocations on Strings
rv = null;
} else if (Integer.class.equals(type) || int.class.equals(type)) {
path = pathFactory.createNumberPath(Integer.class, metadata);
rv = Integer.valueOf(RETURN_VALUE);
} else if (Byte.class.equals(type) || byte.class.equals(type)) {
path = pathFactory.createNumberPath(Byte.class, metadata);
rv = Byte.valueOf((byte)RETURN_VALUE);
} else if (java.util.Date.class.equals(type)) {
path = pathFactory.createDateTimePath((Class)type, metadata);
rv = new Date();
} else if (java.sql.Timestamp.class.equals(type)) {
path = pathFactory.createDateTimePath((Class)type, metadata);
rv = new Timestamp(System.currentTimeMillis());
} else if (java.sql.Date.class.equals(type)) {
path = pathFactory.createDatePath((Class)type, metadata);
rv = new java.sql.Date(System.currentTimeMillis());
} else if (java.sql.Time.class.equals(type)) {
path = pathFactory.createTimePath((Class)type, metadata);
rv = new java.sql.Time(System.currentTimeMillis());
} else if (Long.class.equals(type) || long.class.equals(type)) {
path = pathFactory.createNumberPath(Long.class, metadata);
rv = Long.valueOf(RETURN_VALUE);
} else if (Short.class.equals(type) || short.class.equals(type)) {
path = pathFactory.createNumberPath(Short.class, metadata);
rv = Short.valueOf((short) RETURN_VALUE);
} else if (Double.class.equals(type) || double.class.equals(type)) {
path = pathFactory.createNumberPath(Double.class, metadata);
rv = Double.valueOf(RETURN_VALUE);
} else if (Float.class.equals(type) || float.class.equals(type)) {
path = pathFactory.createNumberPath(Float.class, metadata);
rv = Float.valueOf(RETURN_VALUE);
} else if (BigInteger.class.equals(type)) {
path = pathFactory.createNumberPath((Class)type, metadata);
rv = BigInteger.valueOf(RETURN_VALUE);
} else if (BigDecimal.class.equals(type)) {
path = pathFactory.createNumberPath((Class)type, metadata);
rv = BigDecimal.valueOf(RETURN_VALUE);
} else if (Boolean.class.equals(type) || boolean.class.equals(type)) {
path = pathFactory.createBooleanPath(metadata);
rv = Boolean.TRUE;
} else if (typeSystem.isMapType(type)) {
Class keyType = (Class)ReflectionUtils.getTypeParameter(genericType, 0);
Class valueType = (Class)ReflectionUtils.getTypeParameter(genericType, 1);
path = pathFactory.createMapPath(keyType, valueType, metadata);
rv = aliasFactory.createAliasForProperty(type, parent, path);
} else if (typeSystem.isListType(type)) {
Class elementType = (Class)ReflectionUtils.getTypeParameter(genericType, 0);
path = pathFactory.createListPath(elementType, metadata);
rv = aliasFactory.createAliasForProperty(type, parent, path);
} else if (typeSystem.isSetType(type)) {
Class elementType = ReflectionUtils.getTypeParameterAsClass(genericType, 0);
path = pathFactory.createSetPath(elementType, metadata);
rv = aliasFactory.createAliasForProperty(type, parent, path);
} else if (typeSystem.isCollectionType(type)) {
Class elementType = ReflectionUtils.getTypeParameterAsClass(genericType, 0);
path = pathFactory.createCollectionPath(elementType, metadata);
rv = aliasFactory.createAliasForProperty(type, parent, path);
} else if (Enum.class.isAssignableFrom(type)) {
path = pathFactory.createEnumPath((Class)type, metadata);
rv = type.getEnumConstants()[0];
} else if (type.isArray()) {
path = pathFactory.createArrayPath((Class)type, metadata);
rv = Array.newInstance(type.getComponentType(), 5);
} else {
if (Number.class.isAssignableFrom(type)) {
path = pathFactory.createNumberPath((Class)type, metadata);
} else if (Comparable.class.isAssignableFrom(type)) {
path = pathFactory.createComparablePath((Class)type, metadata);
} else {
path = pathFactory.createEntityPath(type, metadata);
}
if (!Modifier.isFinal(type.getModifiers())) {
rv = aliasFactory.createAliasForProperty(type, parent, path);
} else {
rv = null;
}
}
propToObj.put(propKey, rv);
propToExpr.put(propKey, path);
return (T) rv;
}
protected String propertyNameForGetter(Method method) {
String name = method.getName();
name = name.startsWith("is") ? name.substring(2) : name.substring(3);
return BeanUtils.uncapitalize(name);
}
protected PathMetadata createPropertyPath(Path path, String propertyName) {
return PathMetadataFactory.forProperty(path, propertyName);
}
protected PathMetadata createListAccessPath(Path path, Integer index) {
return PathMetadataFactory.forListAccess(path, index);
}
protected PathMetadata createMapAccessPath(Path path, Object key) {
return PathMetadataFactory.forMapAccess(path, key);
}
}
