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src/java.base/share/classes/java/lang/constant/AsTypeMethodHandleDesc.java

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   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.lang.constant;
  26 


  27 import java.lang.invoke.MethodHandle;
  28 import java.lang.invoke.MethodHandles;
  29 import java.lang.invoke.MethodType;

  30 
  31 import static java.lang.constant.ConstantDescs.BSM_INVOKE;
  32 import static java.lang.constant.ConstantDescs.CD_MethodHandle;
  33 import static java.util.Objects.requireNonNull;
  34 
  35 /**
  36  * A <a href="package-summary.html#nominal">nominal descriptor</a> for a
  37  * {@link MethodHandle} constant that performs a {@link MethodHandle#asType(MethodType)}
  38  * adaptation on another {@link MethodHandle}.
  39  */
  40 final class AsTypeMethodHandleDesc extends DynamicConstantDesc<MethodHandle>
  41         implements MethodHandleDesc {
  42 
  43     private final MethodHandleDesc underlying;
  44     private final MethodTypeDesc type;
  45 
  46     AsTypeMethodHandleDesc(MethodHandleDesc underlying, MethodTypeDesc type) {
  47         super(BSM_INVOKE, ConstantDescs.DEFAULT_NAME, CD_MethodHandle,
  48               ConstantDescs.MHD_METHODHANDLE_ASTYPE, underlying, type);
  49         this.underlying = requireNonNull(underlying);
  50         this.type = requireNonNull(type);
  51     }
  52 
  53     @Override

  54     public MethodTypeDesc invocationType() {
  55         return type;
  56     }
  57 
  58     @Override
  59     public MethodHandle resolveConstantDesc(MethodHandles.Lookup lookup)
  60             throws ReflectiveOperationException {
  61         MethodHandle handle = (MethodHandle) underlying.resolveConstantDesc(lookup);
  62         MethodType methodType = (MethodType) type.resolveConstantDesc(lookup);
  63         return handle.asType(methodType);
  64     }
  65 
  66     @Override
  67     public String toString() {
  68         return  String.format("%s.asType%s", underlying.toString(), type.displayDescriptor());





  69     }
  70 }


   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.lang.constant;
  26 
  27 import jdk.internal.lang.annotation.Foldable;
  28 
  29 import java.lang.invoke.MethodHandle;
  30 import java.lang.invoke.MethodHandles;
  31 import java.lang.invoke.MethodType;
  32 import java.util.Optional;
  33 
  34 import static java.lang.constant.ConstantDescs.BSM_INVOKE;
  35 import static java.lang.constant.ConstantDescs.CD_MethodHandle;
  36 import static java.util.Objects.requireNonNull;
  37 
  38 /**
  39  * A <a href="package-summary.html#nominal">nominal descriptor</a> for a
  40  * {@link MethodHandle} constant that performs a {@link MethodHandle#asType(MethodType)}
  41  * adaptation on another {@link MethodHandle}.
  42  */
  43 final class AsTypeMethodHandleDesc extends DynamicConstantDesc<MethodHandle>
  44         implements MethodHandleDesc {
  45 
  46     private final MethodHandleDesc underlying;
  47     private final MethodTypeDesc type;
  48 
  49     AsTypeMethodHandleDesc(MethodHandleDesc underlying, MethodTypeDesc type) {
  50         super(BSM_INVOKE, ConstantDescs.DEFAULT_NAME, CD_MethodHandle,
  51               ConstantDescs.MHD_METHODHANDLE_ASTYPE, underlying, type);
  52         this.underlying = requireNonNull(underlying);
  53         this.type = requireNonNull(type);
  54     }
  55 
  56     @Override
  57     @Foldable
  58     public MethodTypeDesc invocationType() {
  59         return type;
  60     }
  61 
  62     @Override
  63     public MethodHandle resolveConstantDesc(MethodHandles.Lookup lookup)
  64             throws ReflectiveOperationException {
  65         MethodHandle handle = (MethodHandle) underlying.resolveConstantDesc(lookup);
  66         MethodType methodType = (MethodType) type.resolveConstantDesc(lookup);
  67         return handle.asType(methodType);
  68     }
  69 
  70     @Override
  71     public String toString() {
  72         return  String.format("%s.asType%s", underlying.toString(), type.displayDescriptor());
  73     }
  74 
  75     @Override
  76     public Optional<? extends ConstantDesc> describeConstable() {
  77         return Optional.empty();
  78     }
  79 }
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