| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file, and Oracle licenses the original version of this file under the BSD |
| * license: |
| */ |
| /* |
| Copyright 2009-2013 Attila Szegedi |
| |
| Licensed under both the Apache License, Version 2.0 (the "Apache License") |
| and the BSD License (the "BSD License"), with licensee being free to |
| choose either of the two at their discretion. |
| |
| You may not use this file except in compliance with either the Apache |
| License or the BSD License. |
| |
| If you choose to use this file in compliance with the Apache License, the |
| following notice applies to you: |
| |
| You may obtain a copy of the Apache 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. |
| |
| If you choose to use this file in compliance with the BSD License, the |
| following notice applies to you: |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are |
| met: |
| * Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| * Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| * Neither the name of the copyright holder nor the names of |
| contributors may be used to endorse or promote products derived from |
| this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
| PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
| BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package jdk.internal.dynalink.beans; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.lang.invoke.MethodType; |
| import java.lang.reflect.Array; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Map; |
| import jdk.internal.dynalink.CallSiteDescriptor; |
| import jdk.internal.dynalink.beans.GuardedInvocationComponent.ValidationType; |
| import jdk.internal.dynalink.linker.GuardedInvocation; |
| import jdk.internal.dynalink.linker.LinkerServices; |
| import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker; |
| import jdk.internal.dynalink.support.Guards; |
| import jdk.internal.dynalink.support.Lookup; |
| import jdk.internal.dynalink.support.TypeUtilities; |
| |
| /** |
| * A class that provides linking capabilities for a single POJO class. Normally not used directly, but managed by |
| * {@link BeansLinker}. |
| * |
| * @author Attila Szegedi |
| */ |
| class BeanLinker extends AbstractJavaLinker implements TypeBasedGuardingDynamicLinker { |
| BeanLinker(final Class<?> clazz) { |
| super(clazz, Guards.getClassGuard(clazz), Guards.getInstanceOfGuard(clazz)); |
| if(clazz.isArray()) { |
| // Some languages won't have a notion of manipulating collections. Exposing "length" on arrays as an |
| // explicit property is beneficial for them. |
| // REVISIT: is it maybe a code smell that "dyn:getLength" is not needed? |
| setPropertyGetter("length", GET_ARRAY_LENGTH, ValidationType.IS_ARRAY); |
| } else if(List.class.isAssignableFrom(clazz)) { |
| setPropertyGetter("length", GET_COLLECTION_LENGTH, ValidationType.INSTANCE_OF); |
| } |
| } |
| |
| @Override |
| public boolean canLinkType(final Class<?> type) { |
| return type == clazz; |
| } |
| |
| @Override |
| FacetIntrospector createFacetIntrospector() { |
| return new BeanIntrospector(clazz); |
| } |
| |
| @Override |
| protected GuardedInvocationComponent getGuardedInvocationComponent(final CallSiteDescriptor callSiteDescriptor, |
| final LinkerServices linkerServices, final List<String> operations) throws Exception { |
| final GuardedInvocationComponent superGic = super.getGuardedInvocationComponent(callSiteDescriptor, |
| linkerServices, operations); |
| if(superGic != null) { |
| return superGic; |
| } |
| if(operations.isEmpty()) { |
| return null; |
| } |
| final String op = operations.get(0); |
| // dyn:getElem(this, id) |
| // id is typically either an int (for arrays and lists) or an object (for maps). linkerServices can provide |
| // conversion from call site argument type though. |
| if("getElem".equals(op)) { |
| return getElementGetter(callSiteDescriptor, linkerServices, pop(operations)); |
| } |
| if("setElem".equals(op)) { |
| return getElementSetter(callSiteDescriptor, linkerServices, pop(operations)); |
| } |
| // dyn:getLength(this) (works on Java arrays, collections, and maps) |
| if("getLength".equals(op)) { |
| return getLengthGetter(callSiteDescriptor); |
| } |
| return null; |
| } |
| |
| private static MethodHandle GET_LIST_ELEMENT = Lookup.PUBLIC.findVirtual(List.class, "get", |
| MethodType.methodType(Object.class, int.class)); |
| |
| private static MethodHandle GET_MAP_ELEMENT = Lookup.PUBLIC.findVirtual(Map.class, "get", |
| MethodType.methodType(Object.class, Object.class)); |
| |
| private static MethodHandle LIST_GUARD = Guards.getInstanceOfGuard(List.class); |
| private static MethodHandle MAP_GUARD = Guards.getInstanceOfGuard(Map.class); |
| |
| private enum CollectionType { |
| ARRAY, LIST, MAP |
| }; |
| |
| private GuardedInvocationComponent getElementGetter(final CallSiteDescriptor callSiteDescriptor, |
| final LinkerServices linkerServices, final List<String> operations) throws Exception { |
| final MethodType callSiteType = callSiteDescriptor.getMethodType(); |
| final Class<?> declaredType = callSiteType.parameterType(0); |
| final GuardedInvocationComponent nextComponent = getGuardedInvocationComponent(callSiteDescriptor, |
| linkerServices, operations); |
| |
| // If declared type of receiver at the call site is already an array, a list or map, bind without guard. Thing |
| // is, it'd be quite stupid of a call site creator to go though invokedynamic when it knows in advance they're |
| // dealing with an array, or a list or map, but hey... |
| // Note that for arrays and lists, using LinkerServices.asType() will ensure that any language specific linkers |
| // in use will get a chance to perform any (if there's any) implicit conversion to integer for the indices. |
| final GuardedInvocationComponent gic; |
| final CollectionType collectionType; |
| if(declaredType.isArray()) { |
| gic = createInternalFilteredGuardedInvocationComponent(MethodHandles.arrayElementGetter(declaredType), linkerServices); |
| collectionType = CollectionType.ARRAY; |
| } else if(List.class.isAssignableFrom(declaredType)) { |
| gic = createInternalFilteredGuardedInvocationComponent(GET_LIST_ELEMENT, linkerServices); |
| collectionType = CollectionType.LIST; |
| } else if(Map.class.isAssignableFrom(declaredType)) { |
| gic = createInternalFilteredGuardedInvocationComponent(GET_MAP_ELEMENT, linkerServices); |
| collectionType = CollectionType.MAP; |
| } else if(clazz.isArray()) { |
| gic = getClassGuardedInvocationComponent(linkerServices.filterInternalObjects(MethodHandles.arrayElementGetter(clazz)), callSiteType); |
| collectionType = CollectionType.ARRAY; |
| } else if(List.class.isAssignableFrom(clazz)) { |
| gic = createInternalFilteredGuardedInvocationComponent(GET_LIST_ELEMENT, Guards.asType(LIST_GUARD, callSiteType), List.class, ValidationType.INSTANCE_OF, |
| linkerServices); |
| collectionType = CollectionType.LIST; |
| } else if(Map.class.isAssignableFrom(clazz)) { |
| gic = createInternalFilteredGuardedInvocationComponent(GET_MAP_ELEMENT, Guards.asType(MAP_GUARD, callSiteType), Map.class, ValidationType.INSTANCE_OF, |
| linkerServices); |
| collectionType = CollectionType.MAP; |
| } else { |
| // Can't retrieve elements for objects that are neither arrays, nor list, nor maps. |
| return nextComponent; |
| } |
| |
| // We can have "dyn:getElem:foo", especially in composites, i.e. "dyn:getElem|getProp|getMethod:foo" |
| final String fixedKey = getFixedKey(callSiteDescriptor); |
| // Convert the key to a number if we're working with a list or array |
| final Object typedFixedKey; |
| if(collectionType != CollectionType.MAP && fixedKey != null) { |
| typedFixedKey = convertKeyToInteger(fixedKey, linkerServices); |
| if(typedFixedKey == null) { |
| // key is not numeric, it can never succeed |
| return nextComponent; |
| } |
| } else { |
| typedFixedKey = fixedKey; |
| } |
| |
| final GuardedInvocation gi = gic.getGuardedInvocation(); |
| final Binder binder = new Binder(linkerServices, callSiteType, typedFixedKey); |
| final MethodHandle invocation = gi.getInvocation(); |
| |
| if(nextComponent == null) { |
| return gic.replaceInvocation(binder.bind(invocation)); |
| } |
| |
| final MethodHandle checkGuard; |
| switch(collectionType) { |
| case LIST: |
| checkGuard = convertArgToInt(RANGE_CHECK_LIST, linkerServices, callSiteDescriptor); |
| break; |
| case MAP: |
| // TODO: A more complex solution could be devised for maps, one where we do a get() first, and fold it |
| // into a GWT that tests if it returned null, and if it did, do another GWT with containsKey() |
| // that returns constant null (on true), or falls back to next component (on false) |
| checkGuard = linkerServices.filterInternalObjects(CONTAINS_MAP); |
| break; |
| case ARRAY: |
| checkGuard = convertArgToInt(RANGE_CHECK_ARRAY, linkerServices, callSiteDescriptor); |
| break; |
| default: |
| throw new AssertionError(); |
| } |
| final MethodPair matchedInvocations = matchReturnTypes(binder.bind(invocation), |
| nextComponent.getGuardedInvocation().getInvocation()); |
| return nextComponent.compose(matchedInvocations.guardWithTest(binder.bindTest(checkGuard)), gi.getGuard(), |
| gic.getValidatorClass(), gic.getValidationType()); |
| } |
| |
| private static GuardedInvocationComponent createInternalFilteredGuardedInvocationComponent( |
| final MethodHandle invocation, final LinkerServices linkerServices) { |
| return new GuardedInvocationComponent(linkerServices.filterInternalObjects(invocation)); |
| } |
| |
| private static GuardedInvocationComponent createInternalFilteredGuardedInvocationComponent( |
| final MethodHandle invocation, final MethodHandle guard, final Class<?> validatorClass, |
| final ValidationType validationType, final LinkerServices linkerServices) { |
| return new GuardedInvocationComponent(linkerServices.filterInternalObjects(invocation), guard, |
| validatorClass, validationType); |
| } |
| |
| private static String getFixedKey(final CallSiteDescriptor callSiteDescriptor) { |
| return callSiteDescriptor.getNameTokenCount() == 2 ? null : callSiteDescriptor.getNameToken( |
| CallSiteDescriptor.NAME_OPERAND); |
| } |
| |
| private static Object convertKeyToInteger(final String fixedKey, final LinkerServices linkerServices) throws Exception { |
| try { |
| if(linkerServices.canConvert(String.class, Number.class)) { |
| try { |
| final Object val = linkerServices.getTypeConverter(String.class, Number.class).invoke(fixedKey); |
| if(!(val instanceof Number)) { |
| return null; // not a number |
| } |
| final Number n = (Number)val; |
| if(n instanceof Integer) { |
| return n; |
| } |
| final int intIndex = n.intValue(); |
| final double doubleValue = n.doubleValue(); |
| if(intIndex != doubleValue && !Double.isInfinite(doubleValue)) { // let infinites trigger IOOBE |
| return null; // not an exact integer |
| } |
| return Integer.valueOf(intIndex); |
| } catch(Exception|Error e) { |
| throw e; |
| } catch(final Throwable t) { |
| throw new RuntimeException(t); |
| } |
| } |
| return Integer.valueOf(fixedKey); |
| } catch(final NumberFormatException e) { |
| // key is not a number |
| return null; |
| } |
| } |
| |
| private static MethodHandle convertArgToInt(final MethodHandle mh, final LinkerServices ls, final CallSiteDescriptor desc) { |
| final Class<?> sourceType = desc.getMethodType().parameterType(1); |
| if(TypeUtilities.isMethodInvocationConvertible(sourceType, Number.class)) { |
| return mh; |
| } else if(ls.canConvert(sourceType, Number.class)) { |
| final MethodHandle converter = ls.getTypeConverter(sourceType, Number.class); |
| return MethodHandles.filterArguments(mh, 1, converter.asType(converter.type().changeReturnType( |
| mh.type().parameterType(1)))); |
| } |
| return mh; |
| } |
| |
| /** |
| * Contains methods to adapt an item getter/setter method handle to the requested type, optionally binding it to a |
| * fixed key first. |
| * @author Attila Szegedi |
| * @version $Id: $ |
| */ |
| private static class Binder { |
| private final LinkerServices linkerServices; |
| private final MethodType methodType; |
| private final Object fixedKey; |
| |
| Binder(final LinkerServices linkerServices, final MethodType methodType, final Object fixedKey) { |
| this.linkerServices = linkerServices; |
| this.methodType = fixedKey == null ? methodType : methodType.insertParameterTypes(1, fixedKey.getClass()); |
| this.fixedKey = fixedKey; |
| } |
| |
| /*private*/ MethodHandle bind(final MethodHandle handle) { |
| return bindToFixedKey(linkerServices.asTypeLosslessReturn(handle, methodType)); |
| } |
| |
| /*private*/ MethodHandle bindTest(final MethodHandle handle) { |
| return bindToFixedKey(Guards.asType(handle, methodType)); |
| } |
| |
| private MethodHandle bindToFixedKey(final MethodHandle handle) { |
| return fixedKey == null ? handle : MethodHandles.insertArguments(handle, 1, fixedKey); |
| } |
| } |
| |
| private static MethodHandle RANGE_CHECK_ARRAY = findRangeCheck(Object.class); |
| private static MethodHandle RANGE_CHECK_LIST = findRangeCheck(List.class); |
| private static MethodHandle CONTAINS_MAP = Lookup.PUBLIC.findVirtual(Map.class, "containsKey", |
| MethodType.methodType(boolean.class, Object.class)); |
| |
| private static MethodHandle findRangeCheck(final Class<?> collectionType) { |
| return Lookup.findOwnStatic(MethodHandles.lookup(), "rangeCheck", boolean.class, collectionType, Object.class); |
| } |
| |
| @SuppressWarnings("unused") |
| private static final boolean rangeCheck(final Object array, final Object index) { |
| if(!(index instanceof Number)) { |
| return false; |
| } |
| final Number n = (Number)index; |
| final int intIndex = n.intValue(); |
| final double doubleValue = n.doubleValue(); |
| if(intIndex != doubleValue && !Double.isInfinite(doubleValue)) { // let infinite trigger IOOBE |
| return false; |
| } |
| if(0 <= intIndex && intIndex < Array.getLength(array)) { |
| return true; |
| } |
| throw new ArrayIndexOutOfBoundsException("Array index out of range: " + n); |
| } |
| |
| @SuppressWarnings("unused") |
| private static final boolean rangeCheck(final List<?> list, final Object index) { |
| if(!(index instanceof Number)) { |
| return false; |
| } |
| final Number n = (Number)index; |
| final int intIndex = n.intValue(); |
| final double doubleValue = n.doubleValue(); |
| if(intIndex != doubleValue && !Double.isInfinite(doubleValue)) { // let infinite trigger IOOBE |
| return false; |
| } |
| if(0 <= intIndex && intIndex < list.size()) { |
| return true; |
| } |
| throw new IndexOutOfBoundsException("Index: " + n + ", Size: " + list.size()); |
| } |
| |
| private static MethodHandle SET_LIST_ELEMENT = Lookup.PUBLIC.findVirtual(List.class, "set", |
| MethodType.methodType(Object.class, int.class, Object.class)); |
| |
| private static MethodHandle PUT_MAP_ELEMENT = Lookup.PUBLIC.findVirtual(Map.class, "put", |
| MethodType.methodType(Object.class, Object.class, Object.class)); |
| |
| private GuardedInvocationComponent getElementSetter(final CallSiteDescriptor callSiteDescriptor, |
| final LinkerServices linkerServices, final List<String> operations) throws Exception { |
| final MethodType callSiteType = callSiteDescriptor.getMethodType(); |
| final Class<?> declaredType = callSiteType.parameterType(0); |
| |
| final GuardedInvocationComponent gic; |
| // If declared type of receiver at the call site is already an array, a list or map, bind without guard. Thing |
| // is, it'd be quite stupid of a call site creator to go though invokedynamic when it knows in advance they're |
| // dealing with an array, or a list or map, but hey... |
| // Note that for arrays and lists, using LinkerServices.asType() will ensure that any language specific linkers |
| // in use will get a chance to perform any (if there's any) implicit conversion to integer for the indices. |
| final CollectionType collectionType; |
| if(declaredType.isArray()) { |
| gic = createInternalFilteredGuardedInvocationComponent(MethodHandles.arrayElementSetter(declaredType), linkerServices); |
| collectionType = CollectionType.ARRAY; |
| } else if(List.class.isAssignableFrom(declaredType)) { |
| gic = createInternalFilteredGuardedInvocationComponent(SET_LIST_ELEMENT, linkerServices); |
| collectionType = CollectionType.LIST; |
| } else if(Map.class.isAssignableFrom(declaredType)) { |
| gic = createInternalFilteredGuardedInvocationComponent(PUT_MAP_ELEMENT, linkerServices); |
| collectionType = CollectionType.MAP; |
| } else if(clazz.isArray()) { |
| gic = getClassGuardedInvocationComponent(linkerServices.filterInternalObjects( |
| MethodHandles.arrayElementSetter(clazz)), callSiteType); |
| collectionType = CollectionType.ARRAY; |
| } else if(List.class.isAssignableFrom(clazz)) { |
| gic = createInternalFilteredGuardedInvocationComponent(SET_LIST_ELEMENT, Guards.asType(LIST_GUARD, callSiteType), List.class, ValidationType.INSTANCE_OF, |
| linkerServices); |
| collectionType = CollectionType.LIST; |
| } else if(Map.class.isAssignableFrom(clazz)) { |
| gic = createInternalFilteredGuardedInvocationComponent(PUT_MAP_ELEMENT, Guards.asType(MAP_GUARD, callSiteType), |
| Map.class, ValidationType.INSTANCE_OF, linkerServices); |
| collectionType = CollectionType.MAP; |
| } else { |
| // Can't set elements for objects that are neither arrays, nor list, nor maps. |
| gic = null; |
| collectionType = null; |
| } |
| |
| // In contrast to, say, getElementGetter, we only compute the nextComponent if the target object is not a map, |
| // as maps will always succeed in setting the element and will never need to fall back to the next component |
| // operation. |
| final GuardedInvocationComponent nextComponent = collectionType == CollectionType.MAP ? null : getGuardedInvocationComponent( |
| callSiteDescriptor, linkerServices, operations); |
| if(gic == null) { |
| return nextComponent; |
| } |
| |
| // We can have "dyn:setElem:foo", especially in composites, i.e. "dyn:setElem|setProp:foo" |
| final String fixedKey = getFixedKey(callSiteDescriptor); |
| // Convert the key to a number if we're working with a list or array |
| final Object typedFixedKey; |
| if(collectionType != CollectionType.MAP && fixedKey != null) { |
| typedFixedKey = convertKeyToInteger(fixedKey, linkerServices); |
| if(typedFixedKey == null) { |
| // key is not numeric, it can never succeed |
| return nextComponent; |
| } |
| } else { |
| typedFixedKey = fixedKey; |
| } |
| |
| final GuardedInvocation gi = gic.getGuardedInvocation(); |
| final Binder binder = new Binder(linkerServices, callSiteType, typedFixedKey); |
| final MethodHandle invocation = gi.getInvocation(); |
| |
| if(nextComponent == null) { |
| return gic.replaceInvocation(binder.bind(invocation)); |
| } |
| |
| assert collectionType == CollectionType.LIST || collectionType == CollectionType.ARRAY; |
| final MethodHandle checkGuard = convertArgToInt(collectionType == CollectionType.LIST ? RANGE_CHECK_LIST : |
| RANGE_CHECK_ARRAY, linkerServices, callSiteDescriptor); |
| final MethodPair matchedInvocations = matchReturnTypes(binder.bind(invocation), |
| nextComponent.getGuardedInvocation().getInvocation()); |
| return nextComponent.compose(matchedInvocations.guardWithTest(binder.bindTest(checkGuard)), gi.getGuard(), |
| gic.getValidatorClass(), gic.getValidationType()); |
| } |
| |
| private static MethodHandle GET_ARRAY_LENGTH = Lookup.PUBLIC.findStatic(Array.class, "getLength", |
| MethodType.methodType(int.class, Object.class)); |
| |
| private static MethodHandle GET_COLLECTION_LENGTH = Lookup.PUBLIC.findVirtual(Collection.class, "size", |
| MethodType.methodType(int.class)); |
| |
| private static MethodHandle GET_MAP_LENGTH = Lookup.PUBLIC.findVirtual(Map.class, "size", |
| MethodType.methodType(int.class)); |
| |
| private static MethodHandle COLLECTION_GUARD = Guards.getInstanceOfGuard(Collection.class); |
| |
| private GuardedInvocationComponent getLengthGetter(final CallSiteDescriptor callSiteDescriptor) { |
| assertParameterCount(callSiteDescriptor, 1); |
| final MethodType callSiteType = callSiteDescriptor.getMethodType(); |
| final Class<?> declaredType = callSiteType.parameterType(0); |
| // If declared type of receiver at the call site is already an array, collection, or map, bind without guard. |
| // Thing is, it'd be quite stupid of a call site creator to go though invokedynamic when it knows in advance |
| // they're dealing with an array, collection, or map, but hey... |
| if(declaredType.isArray()) { |
| return new GuardedInvocationComponent(GET_ARRAY_LENGTH.asType(callSiteType)); |
| } else if(Collection.class.isAssignableFrom(declaredType)) { |
| return new GuardedInvocationComponent(GET_COLLECTION_LENGTH.asType(callSiteType)); |
| } else if(Map.class.isAssignableFrom(declaredType)) { |
| return new GuardedInvocationComponent(GET_MAP_LENGTH.asType(callSiteType)); |
| } |
| |
| // Otherwise, create a binding based on the actual type of the argument with an appropriate guard. |
| if(clazz.isArray()) { |
| return new GuardedInvocationComponent(GET_ARRAY_LENGTH.asType(callSiteType), Guards.isArray(0, |
| callSiteType), ValidationType.IS_ARRAY); |
| } if(Collection.class.isAssignableFrom(clazz)) { |
| return new GuardedInvocationComponent(GET_COLLECTION_LENGTH.asType(callSiteType), Guards.asType( |
| COLLECTION_GUARD, callSiteType), Collection.class, ValidationType.INSTANCE_OF); |
| } if(Map.class.isAssignableFrom(clazz)) { |
| return new GuardedInvocationComponent(GET_MAP_LENGTH.asType(callSiteType), Guards.asType(MAP_GUARD, |
| callSiteType), Map.class, ValidationType.INSTANCE_OF); |
| } |
| // Can't retrieve length for objects that are neither arrays, nor collections, nor maps. |
| return null; |
| } |
| |
| private static void assertParameterCount(final CallSiteDescriptor descriptor, final int paramCount) { |
| if(descriptor.getMethodType().parameterCount() != paramCount) { |
| throw new BootstrapMethodError(descriptor.getName() + " must have exactly " + paramCount + " parameters."); |
| } |
| } |
| } |
