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8210031: implementation for JVM Constants API

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Co-authored-by: Brian Goetz <brian.goetz@oracle.com>
Reviewed-by: jrose, mcimadamore, darcy, mchung, rriggs, dholmes, forax
This commit is contained in:
Vicente Romero 2018-12-09 12:36:24 -05:00
parent b80d335354
commit 9846588b31
72 changed files with 6719 additions and 103 deletions
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33
src/java.base/share/classes/java/lang/String.java
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@ -28,6 +28,9 @@ package java.lang;
import java.io.ObjectStreamField;
import java.io.UnsupportedEncodingException;
import java.lang.annotation.Native;
import java.lang.invoke.MethodHandles;
import java.lang.constant.Constable;
import java.lang.constant.ConstantDesc;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
@ -35,6 +38,7 @@ import java.util.Comparator;
import java.util.Formatter;
import java.util.Locale;
import java.util.Objects;
import java.util.Optional;
import java.util.Spliterator;
import java.util.StringJoiner;
import java.util.function.Function;
@ -127,7 +131,8 @@ import static java.util.function.Predicate.not;
*/
public final class String
implements java.io.Serializable, Comparable<String>, CharSequence {
implements java.io.Serializable, Comparable<String>, CharSequence,
Constable, ConstantDesc {
/**
* The value is used for character storage.
@ -3538,4 +3543,30 @@ public final class String
throw new IllegalArgumentException(
format("Not a valid Unicode code point: 0x%X", codePoint));
}
/**
* Returns a nominal descriptor for this instance, which is the instance
* itself.
*
* @return an {@link Optional} describing the {@linkplain String} instance
* @since 12
*/
@Override
public Optional<String> describeConstable() {
return Optional.of(this);
}
/**
* Resolves this instance as a {@link ConstantDesc}, the result of which is
* the instance itself.
*
* @param lookup ignored
* @return the {@linkplain String} instance
* @since 12
*/
@Override
public String resolveConstantDesc(MethodHandles.Lookup lookup) {
return this;
}
}