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Broke out StringValue implementations
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47 changes: 47 additions & 0 deletions
47
community/values/src/main/java/org/neo4j/values/storable/StringWrappingStringValue.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| /* | ||
| * Copyright (c) 2002-2017 "Neo Technology," | ||
| * Network Engine for Objects in Lund AB [http://neotechnology.com] | ||
| * | ||
| * This file is part of Neo4j. | ||
| * | ||
| * Neo4j is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program 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 for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package org.neo4j.values.storable; | ||
|
|
||
| /** | ||
| * Implementation of StringValue that wraps a `java.lang.String` and | ||
| * delegates methods to that instance. | ||
| */ | ||
| final class StringWrappingStringValue extends StringValue | ||
| { | ||
| final String value; | ||
|
|
||
| StringWrappingStringValue( String value ) | ||
| { | ||
| assert value != null; | ||
| this.value = value; | ||
| } | ||
|
|
||
| @Override | ||
| String value() | ||
| { | ||
| return value; | ||
| } | ||
|
|
||
| @Override | ||
| public int length() | ||
| { | ||
| return value.codePointCount( 0, value.length() ); | ||
| } | ||
| } |
117 changes: 117 additions & 0 deletions
117
community/values/src/main/java/org/neo4j/values/storable/UTF8StringValue.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| /* | ||
| * Copyright (c) 2002-2017 "Neo Technology," | ||
| * Network Engine for Objects in Lund AB [http://neotechnology.com] | ||
| * | ||
| * This file is part of Neo4j. | ||
| * | ||
| * Neo4j is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program 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 for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package org.neo4j.values.storable; | ||
|
|
||
| import java.nio.charset.StandardCharsets; | ||
| import java.util.Arrays; | ||
|
|
||
| /* | ||
| * Just as a normal StringValue but is backed by a byte array and does string | ||
| * serialization lazily. | ||
| * | ||
| * TODO in this implementation most operations will actually load the string | ||
| * such as hashCode, length. These could be implemented using | ||
| * the byte array directly in later optimizations | ||
| */ | ||
| public final class UTF8StringValue extends StringValue | ||
| { | ||
| private volatile String value; | ||
| private final byte[] bytes; | ||
| private final int offset; | ||
| private final int length; | ||
|
|
||
| UTF8StringValue( byte[] bytes, int offset, int length ) | ||
| { | ||
| assert bytes != null; | ||
| this.bytes = bytes; | ||
| this.offset = offset; | ||
| this.length = length; | ||
| } | ||
|
|
||
| @Override | ||
| public <E extends Exception> void writeTo( ValueWriter<E> writer ) throws E | ||
| { | ||
| writer.writeUTF8( bytes, offset, length ); | ||
| } | ||
|
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||
| @Override | ||
| public boolean equals( Value value ) | ||
| { | ||
| if ( value instanceof org.neo4j.values.storable.UTF8StringValue ) | ||
| { | ||
| return Arrays.equals( bytes, ((org.neo4j.values.storable.UTF8StringValue) value).bytes ); | ||
| } | ||
| else | ||
| { | ||
| return super.equals( value ); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| String value() | ||
| { | ||
| String s = value; | ||
| if ( s == null ) | ||
| { | ||
| synchronized ( this ) | ||
| { | ||
| s = value; | ||
| if ( s == null ) | ||
| { | ||
| s = value = new String( bytes, offset, length, StandardCharsets.UTF_8 ); | ||
|
|
||
| } | ||
| } | ||
| } | ||
| return s; | ||
| } | ||
|
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||
| @Override | ||
| public int length() | ||
| { | ||
| int count = 0, i = offset, len = offset + length; | ||
| while ( i < len ) | ||
| { | ||
| byte b = bytes[i]; | ||
| //If high bit is zero (equivalent to the byte being positive in two's complement) | ||
| //we are dealing with an ascii value and use a single byte for storing the value. | ||
| if ( b >= 0 ) | ||
| { | ||
| i++; | ||
| } | ||
|
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| //The number of high bits tells us how many bytes we use to store the value | ||
| //e.g. 110xxxx -> need two bytes, 1110xxxx -> need three bytes, 11110xxx -> needs | ||
| //four bytes | ||
| while ( b < 0 ) | ||
| { | ||
| i++; | ||
| b = (byte) (b << 1); | ||
| } | ||
| count++; | ||
| } | ||
| return count; | ||
| } | ||
|
|
||
| public byte[] bytes() | ||
| { | ||
| return bytes; | ||
| } | ||
| } |
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