├── .gitignore ├── LICENSE ├── README.md ├── build.gradle ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── settings.gradle └── src ├── main └── kotlin │ └── com │ └── bennyhuo │ └── kotlin │ └── delegates │ └── Delegates.kt └── test └── kotlin └── com └── bennyhuo └── kotlin └── delegates └── DelegatesTest.kt /.gitignore: -------------------------------------------------------------------------------- 1 | build 2 | .gradle 3 | *.iml 4 | .idea 5 | jcenter.properties -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2018 Bennyhuo 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # ObjectPropertyDelegate 2 | ObjectPropertyDelegate for Kotlin class properties & functions. 3 | 4 | # Demo 5 | 6 | Suppose you have a class called `Wrapped` which owns some properties and functions. 7 | 8 | ```kotlin 9 | class Wrapped(var x: Boolean) { 10 | val z = 10L 11 | fun setY(y: Int) { 12 | 13 | } 14 | 15 | fun getY() = 12 16 | } 17 | ``` 18 | 19 | Now you want to wrap it into another class called `Wrapper`, and you may need to delegate properties or functions with properties declared in `Wrapper`. 20 | 21 | You can use this library to handle that easily. 22 | 23 | ```kotlin 24 | class Wrapper { 25 | private val wrapped: Wrapped = Wrapped(false) 26 | 27 | var x by wrapped::x.delegator() 28 | var y by wrapped::setY.delegator(defaultValue = 0) 29 | val yGetter by wrapped::getY.delegator() 30 | val z by wrapped::z.delegator() 31 | } 32 | ``` 33 | 34 | For those who want to delegate lazy initialized properties, such as: 35 | 36 | ```kotlin 37 | class MainActivity: Activity() { 38 | // This would lead to null pointer exception. 39 | val name by delegateOf(TextView::getText, TextView::setText, textView) 40 | // or 41 | val name by delegateOf(textView::getText, textView::setText) 42 | 43 | } 44 | ``` 45 | 46 | `nameView` may be initialized after the content view setting up, so we need a lazy delegate for that: 47 | 48 | ```kotlin 49 | class MainActivity: Activity() { 50 | 51 | val name by delegateLazyOf(TextView::getText, TextView::setText) { textView } 52 | 53 | } 54 | ``` 55 | 56 | Only accessing `nameView` when `name` is accessed. 57 | 58 | Works like a charm. 59 | 60 | # Use in your project 61 | 62 | It has been deployed to jCenter. 63 | 64 | ``` 65 | implementation("com.bennyhuo.kotlin:delegates:1.0") 66 | ``` 67 | 68 | # Issue 69 | 70 | Please feel free to issue and pull request. 71 | 72 | # License 73 | 74 | [MIT License](LICENSE) -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | buildscript { 2 | ext.kotlin_version = '1.3.71' 3 | 4 | repositories { 5 | jcenter() 6 | } 7 | dependencies { 8 | classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" 9 | classpath 'com.novoda:bintray-release:0.9.2' 10 | } 11 | } 12 | 13 | group 'com.bennyhuo.kotlin' 14 | version '1.0' 15 | 16 | apply plugin: 'java' 17 | apply plugin: 'kotlin' 18 | 19 | sourceCompatibility = 1.8 20 | 21 | repositories { 22 | jcenter() 23 | } 24 | 25 | dependencies { 26 | compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version" 27 | testCompile group: 'junit', name: 'junit', version: '4.12' 28 | } 29 | 30 | compileKotlin { 31 | kotlinOptions.jvmTarget = "1.8" 32 | } 33 | compileTestKotlin { 34 | kotlinOptions.jvmTarget = "1.8" 35 | } 36 | 37 | def props = new Properties() 38 | file("jcenter.properties").withInputStream { props.load(it) } 39 | 40 | ext { 41 | userName = props.getProperty("bintray.user") 42 | apiKey = props.getProperty("bintray.key") 43 | repoName = "bennyhuo" 44 | groupId = project.group 45 | publishVersion = project.version 46 | desc = "" 47 | website = 'https://github.com/enbandari/ObjectPropertyDelegate' 48 | dryRun = "false" 49 | } 50 | 51 | 52 | task sourcesJar(type: Jar) { 53 | from sourceSets.main.java.srcDirs 54 | classifier = 'sources' 55 | } 56 | 57 | artifacts { 58 | archives sourcesJar 59 | } 60 | 61 | apply plugin: 'com.novoda.bintray-release' 62 | 63 | publish { 64 | userOrg = project.userName 65 | groupId = project.groupId 66 | repoName = project.repoName 67 | artifactId = 'delegates' 68 | publishVersion = project.publishVersion 69 | desc = project.desc//描述，不重要 70 | website = project.website 71 | bintrayUser = project.userName 72 | bintrayKey = project.apiKey 73 | dryRun = project.dryRun 74 | } -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/bennyhuo/ObjectPropertyDelegate/a8518c0bfac100deda8dbd627e83fface9006ca5/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | distributionBase=GRADLE_USER_HOME 2 | distributionPath=wrapper/dists 3 | zipStoreBase=GRADLE_USER_HOME 4 | zipStorePath=wrapper/dists 5 | distributionUrl=https\://services.gradle.org/distributions/gradle-6.2-all.zip 6 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env sh 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Attempt to set APP_HOME 10 | # Resolve links: $0 may be a link 11 | PRG="$0" 12 | # Need this for relative symlinks. 13 | while [ -h "$PRG" ] ; do 14 | ls=`ls -ld "$PRG"` 15 | link=`expr "$ls" : '.*-> \(.*\)$'` 16 | if expr "$link" : '/.*' > /dev/null; then 17 | PRG="$link" 18 | else 19 | PRG=`dirname "$PRG"`"/$link" 20 | fi 21 | done 22 | SAVED="`pwd`" 23 | cd "`dirname \"$PRG\"`/" >/dev/null 24 | APP_HOME="`pwd -P`" 25 | cd "$SAVED" >/dev/null 26 | 27 | APP_NAME="Gradle" 28 | APP_BASE_NAME=`basename "$0"` 29 | 30 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 31 | DEFAULT_JVM_OPTS="" 32 | 33 | # Use the maximum available, or set MAX_FD != -1 to use that value. 34 | MAX_FD="maximum" 35 | 36 | warn () { 37 | echo "$*" 38 | } 39 | 40 | die () { 41 | echo 42 | echo "$*" 43 | echo 44 | exit 1 45 | } 46 | 47 | # OS specific support (must be 'true' or 'false'). 48 | cygwin=false 49 | msys=false 50 | darwin=false 51 | nonstop=false 52 | case "`uname`" in 53 | CYGWIN* ) 54 | cygwin=true 55 | ;; 56 | Darwin* ) 57 | darwin=true 58 | ;; 59 | MINGW* ) 60 | msys=true 61 | ;; 62 | NONSTOP* ) 63 | nonstop=true 64 | ;; 65 | esac 66 | 67 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 68 | 69 | # Determine the Java command to use to start the JVM. 70 | if [ -n "$JAVA_HOME" ] ; then 71 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 72 | # IBM's JDK on AIX uses strange locations for the executables 73 | JAVACMD="$JAVA_HOME/jre/sh/java" 74 | else 75 | JAVACMD="$JAVA_HOME/bin/java" 76 | fi 77 | if [ ! -x "$JAVACMD" ] ; then 78 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 79 | 80 | Please set the JAVA_HOME variable in your environment to match the 81 | location of your Java installation." 82 | fi 83 | else 84 | JAVACMD="java" 85 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 86 | 87 | Please set the JAVA_HOME variable in your environment to match the 88 | location of your Java installation." 89 | fi 90 | 91 | # Increase the maximum file descriptors if we can. 92 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 93 | MAX_FD_LIMIT=`ulimit -H -n` 94 | if [ $? -eq 0 ] ; then 95 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 96 | MAX_FD="$MAX_FD_LIMIT" 97 | fi 98 | ulimit -n $MAX_FD 99 | if [ $? -ne 0 ] ; then 100 | warn "Could not set maximum file descriptor limit: $MAX_FD" 101 | fi 102 | else 103 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 104 | fi 105 | fi 106 | 107 | # For Darwin, add options to specify how the application appears in the dock 108 | if $darwin; then 109 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 110 | fi 111 | 112 | # For Cygwin, switch paths to Windows format before running java 113 | if $cygwin ; then 114 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 115 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 116 | JAVACMD=`cygpath --unix "$JAVACMD"` 117 | 118 | # We build the pattern for arguments to be converted via cygpath 119 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 120 | SEP="" 121 | for dir in $ROOTDIRSRAW ; do 122 | ROOTDIRS="$ROOTDIRS$SEP$dir" 123 | SEP="|" 124 | done 125 | OURCYGPATTERN="(^($ROOTDIRS))" 126 | # Add a user-defined pattern to the cygpath arguments 127 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 128 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 129 | fi 130 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 131 | i=0 132 | for arg in "$@" ; do 133 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 134 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 135 | 136 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 137 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 138 | else 139 | eval `echo args$i`="\"$arg\"" 140 | fi 141 | i=$((i+1)) 142 | done 143 | case $i in 144 | (0) set -- ;; 145 | (1) set -- "$args0" ;; 146 | (2) set -- "$args0" "$args1" ;; 147 | (3) set -- "$args0" "$args1" "$args2" ;; 148 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 149 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 150 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 151 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 152 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 153 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 154 | esac 155 | fi 156 | 157 | # Escape application args 158 | save () { 159 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done 160 | echo " " 161 | } 162 | APP_ARGS=$(save "$@") 163 | 164 | # Collect all arguments for the java command, following the shell quoting and substitution rules 165 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" 166 | 167 | # by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong 168 | if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then 169 | cd "$(dirname "$0")" 170 | fi 171 | 172 | exec "$JAVACMD" "$@" 173 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @if "%DEBUG%" == "" @echo off 2 | @rem ########################################################################## 3 | @rem 4 | @rem Gradle startup script for Windows 5 | @rem 6 | @rem ########################################################################## 7 | 8 | @rem Set local scope for the variables with windows NT shell 9 | if "%OS%"=="Windows_NT" setlocal 10 | 11 | set DIRNAME=%~dp0 12 | if "%DIRNAME%" == "" set DIRNAME=. 13 | set APP_BASE_NAME=%~n0 14 | set APP_HOME=%DIRNAME% 15 | 16 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 17 | set DEFAULT_JVM_OPTS= 18 | 19 | @rem Find java.exe 20 | if defined JAVA_HOME goto findJavaFromJavaHome 21 | 22 | set JAVA_EXE=java.exe 23 | %JAVA_EXE% -version >NUL 2>&1 24 | if "%ERRORLEVEL%" == "0" goto init 25 | 26 | echo. 27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 28 | echo. 29 | echo Please set the JAVA_HOME variable in your environment to match the 30 | echo location of your Java installation. 31 | 32 | goto fail 33 | 34 | :findJavaFromJavaHome 35 | set JAVA_HOME=%JAVA_HOME:"=% 36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 37 | 38 | if exist "%JAVA_EXE%" goto init 39 | 40 | echo. 41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 42 | echo. 43 | echo Please set the JAVA_HOME variable in your environment to match the 44 | echo location of your Java installation. 45 | 46 | goto fail 47 | 48 | :init 49 | @rem Get command-line arguments, handling Windows variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | 53 | :win9xME_args 54 | @rem Slurp the command line arguments. 55 | set CMD_LINE_ARGS= 56 | set _SKIP=2 57 | 58 | :win9xME_args_slurp 59 | if "x%~1" == "x" goto execute 60 | 61 | set CMD_LINE_ARGS=%* 62 | 63 | :execute 64 | @rem Setup the command line 65 | 66 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 67 | 68 | @rem Execute Gradle 69 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 70 | 71 | :end 72 | @rem End local scope for the variables with windows NT shell 73 | if "%ERRORLEVEL%"=="0" goto mainEnd 74 | 75 | :fail 76 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 77 | rem the _cmd.exe /c_ return code! 78 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 79 | exit /b 1 80 | 81 | :mainEnd 82 | if "%OS%"=="Windows_NT" endlocal 83 | 84 | :omega 85 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | rootProject.name = 'ObjectPropertyDelegate' 2 | 3 | -------------------------------------------------------------------------------- /src/main/kotlin/com/bennyhuo/kotlin/delegates/Delegates.kt: -------------------------------------------------------------------------------- 1 | package com.bennyhuo.kotlin.delegates 2 | 3 | import kotlin.jvm.internal.PropertyReference 4 | import kotlin.properties.ReadWriteProperty 5 | import kotlin.reflect.* 6 | 7 | fun delegateOf(setter: ((T) -> Unit), initializedValue: T? = null): ReadWriteProperty = ObjectPropertyDelegateNoGetter0(setter, initializedValue) 8 | fun delegateOf(getter: (() -> T), setter: ((T) -> Unit)? = null, initializedValue: T? = null): ReadWriteProperty = ObjectPropertyDelegate0(getter, setter, initializedValue) 9 | 10 | fun delegateOf(setter: ((R, T) -> Unit), receiver: R, initializedValue: T? = null): ReadWriteProperty = ObjectPropertyDelegateNoGetter1(receiver, setter, initializedValue) 11 | fun delegateOf(getter: ((R) -> T), setter: ((R, T) -> Unit)? = null, receiver: R, initializedValue: T? = null): ReadWriteProperty = ObjectPropertyDelegate1(receiver, getter, setter, initializedValue) 12 | 13 | fun delegateLazyOf(setter: ((R, T) -> Unit), initializedValue: T? = null, lazyReceiver: () -> R): ReadWriteProperty = ObjectPropertyDelegateNoGetterLazy1(lazyReceiver, setter, initializedValue) 14 | fun delegateLazyOf(getter: ((R) -> T), setter: ((R, T) -> Unit)? = null, initializedValue: T? = null, lazyReceiver: () -> R): ReadWriteProperty = ObjectPropertyDelegateLazy1(lazyReceiver, getter, setter, initializedValue) 15 | 16 | @Deprecated(message = "Please use delegateOf instead.", 17 | replaceWith = ReplaceWith("delegateOf(setter, receiver, initializedValue)", "com.bennyhuo.kotlin.delegates")) 18 | fun delegateWithReceiverOf(receiver: R, setter: ((R, T) -> Unit), initializedValue: T? = null): ReadWriteProperty = ObjectPropertyDelegateNoGetter1(receiver, setter, initializedValue) 19 | @Deprecated(message = "Please use delegateOf instead.", 20 | replaceWith = ReplaceWith("delegateOf(getter, setter, receiver, initializedValue)", "com.bennyhuo.kotlin.delegates")) 21 | fun delegateWithReceiverOf(receiver: R, getter: ((R) -> T), setter: ((R, T) -> Unit)? = null, initializedValue: T? = null): ReadWriteProperty = ObjectPropertyDelegate1(receiver, getter, setter, initializedValue) 22 | 23 | fun KProperty0.delegator(initializedValue: T? = null): ReadWriteProperty = ObjectPropertyDelegate0(propertyRef = this as PropertyReference, initializedValue = initializedValue) 24 | fun KProperty1.delegator(receiver: R, initializedValue: T? = null): ReadWriteProperty = ObjectPropertyDelegate1(receiver, property = this, initializedValue = initializedValue) 25 | fun KProperty1.delegatorLazy(initializedValue: T? = null, lazyReceiver: () -> R): ReadWriteProperty = ObjectPropertyDelegateLazy1(lazyReceiver, property = this, initializedValue = initializedValue) 26 | 27 | @JvmName("delegatorGetter") 28 | fun KFunction0.delegator(initializedValue: T? = null): ReadWriteProperty = ObjectPropertyDelegate0(this, initializedValue = initializedValue) 29 | 30 | @JvmName("delegatorGetter") 31 | fun KFunction1.delegator(receiver: R, initializedValue: T? = null): ReadWriteProperty = ObjectPropertyDelegate1(receiver, this, initializedValue = initializedValue) 32 | 33 | @JvmName("delegatorGetterLazy") 34 | fun KFunction1.delegatorLazy(initializedValue: T? = null, lazyReceiver: () -> R): ReadWriteProperty = ObjectPropertyDelegateLazy1(lazyReceiver, this, initializedValue = initializedValue) 35 | 36 | fun KFunction1.delegator(initializedValue: T? = null): ReadWriteProperty = ObjectPropertyDelegateNoGetter0(setter = this, initializedValue = initializedValue) 37 | fun KFunction2.delegator(receiver: R, initializedValue: T? = null): ReadWriteProperty = ObjectPropertyDelegateNoGetter1(receiver, setter = this, initializedValue = initializedValue) 38 | fun KFunction2.delegatorLazy(initializedValue: T? = null, lazyReceiver: () -> R): ReadWriteProperty = ObjectPropertyDelegateNoGetterLazy1(lazyReceiver, setter = this, initializedValue = initializedValue) 39 | 40 | internal class ObjectPropertyDelegateNoGetter0(val setter: ((T) -> Unit), initializedValue: T? = null) : ReadWriteProperty { 41 | private var value: T? = initializedValue 42 | 43 | init { 44 | initializedValue?.let { setter.invoke(it) } 45 | } 46 | 47 | override operator fun getValue(thisRef: Any, property: KProperty<*>): T { 48 | return value!! 49 | } 50 | 51 | override operator fun setValue(thisRef: Any, property: KProperty<*>, value: T) { 52 | setter.invoke(value) 53 | this.value = value 54 | } 55 | } 56 | 57 | @Suppress("UNCHECKED_CAST") 58 | internal class ObjectPropertyDelegate0(val getter: (() -> T), val setter: ((T) -> Unit)? = null, initializedValue: T? = null) : ReadWriteProperty { 59 | 60 | constructor(propertyRef: PropertyReference, initializedValue: T? = null) 61 | : this((propertyRef as KProperty0)::get, if (propertyRef is KMutableProperty0<*>) (propertyRef as KMutableProperty0)::set else null, initializedValue) 62 | 63 | init { 64 | initializedValue?.let { setter?.invoke(it) } 65 | } 66 | 67 | override operator fun getValue(thisRef: Any, property: KProperty<*>): T { 68 | return getter.invoke() 69 | } 70 | 71 | override operator fun setValue(thisRef: Any, property: KProperty<*>, value: T) { 72 | setter?.invoke(value) 73 | } 74 | } 75 | 76 | internal abstract class AbsObjectPropertyDelegateNoGetter1(val setter: ((R, T) -> Unit), initializedValue: T? = null) : ReadWriteProperty { 77 | private var value: T? = initializedValue 78 | 79 | protected abstract val receiver: R 80 | 81 | final override operator fun getValue(thisRef: Any, property: KProperty<*>): T { 82 | return value!! 83 | } 84 | 85 | final override operator fun setValue(thisRef: Any, property: KProperty<*>, value: T) { 86 | setter.invoke(receiver, value) 87 | this.value = value 88 | } 89 | } 90 | 91 | internal class ObjectPropertyDelegateNoGetter1(override val receiver: R, setter: ((R, T) -> Unit), initializedValue: T? = null) 92 | : AbsObjectPropertyDelegateNoGetter1(setter, initializedValue) { 93 | 94 | init { 95 | initializedValue?.let { setter.invoke(receiver, it) } 96 | } 97 | } 98 | 99 | internal class ObjectPropertyDelegateNoGetterLazy1(lazyReceiver: () -> R, setter: ((R, T) -> Unit), initializedValue: T? = null) 100 | : AbsObjectPropertyDelegateNoGetter1(setter, initializedValue) { 101 | 102 | override val receiver by lazy { 103 | lazyReceiver().also { receiver -> 104 | initializedValue?.let { setter.invoke(receiver, it) } 105 | } 106 | } 107 | } 108 | 109 | internal abstract class AbsObjectPropertyDelegate1(val getter: ((R) -> T), val setter: ((R, T) -> Unit)? = null) : ReadWriteProperty { 110 | 111 | protected abstract val receiver: R 112 | 113 | final override operator fun getValue(thisRef: Any, property: KProperty<*>): T { 114 | return getter.invoke(receiver) 115 | } 116 | 117 | final override operator fun setValue(thisRef: Any, property: KProperty<*>, value: T) { 118 | setter?.invoke(receiver, value) 119 | } 120 | } 121 | 122 | internal class ObjectPropertyDelegate1(override val receiver: R, getter: ((R) -> T), setter: ((R, T) -> Unit)? = null, initializedValue: T? = null) 123 | : AbsObjectPropertyDelegate1(getter, setter) { 124 | 125 | constructor(receiver: R, property: KProperty1, initializedValue: T? = null) 126 | : this(receiver, property, if (property is KMutableProperty1<*, *>) (property as KMutableProperty1)::set else null, initializedValue) 127 | 128 | init { 129 | initializedValue?.let { setter?.invoke(receiver, it) } 130 | } 131 | } 132 | 133 | internal class ObjectPropertyDelegateLazy1(lazyReceiver: () -> R, getter: ((R) -> T), setter: ((R, T) -> Unit)? = null, initializedValue: T? = null) 134 | : AbsObjectPropertyDelegate1(getter, setter) { 135 | 136 | constructor(lazyReceiver: () -> R, property: KProperty1, initializedValue: T? = null) 137 | : this(lazyReceiver, property, if (property is KMutableProperty1<*, *>) (property as KMutableProperty1)::set else null, initializedValue) 138 | 139 | override val receiver by lazy { 140 | lazyReceiver().also { receiver -> 141 | initializedValue?.let { setter?.invoke(receiver, it) } 142 | } 143 | } 144 | } -------------------------------------------------------------------------------- /src/test/kotlin/com/bennyhuo/kotlin/delegates/DelegatesTest.kt: -------------------------------------------------------------------------------- 1 | package com.bennyhuo.kotlin.delegates 2 | 3 | import org.junit.Assert 4 | import org.junit.Test 5 | import java.lang.AssertionError 6 | 7 | class Test{ 8 | @Test 9 | fun test() { 10 | val wrapper = Wrapper() 11 | Assert.assertTrue(!wrapper.x) 12 | wrapper.x = true 13 | Assert.assertEquals(wrapper.y, 0) 14 | wrapper.y = 1 15 | Assert.assertTrue(wrapper.x) 16 | Assert.assertEquals(wrapper.y, 1) 17 | Assert.assertEquals(wrapper.yGetter, 12) 18 | Assert.assertEquals(wrapper.z, 10) 19 | 20 | Assert.assertFalse(wrapper.wrappedLazyInitialized) 21 | Assert.assertFalse(wrapper.xLazy) 22 | Assert.assertTrue(wrapper.wrappedLazyInitialized) 23 | 24 | Assert.assertEquals(wrapper.z, 10) 25 | } 26 | } 27 | 28 | class Wrapper { 29 | private val wrapped: Wrapped = Wrapped(false) 30 | 31 | var wrappedLazyInitialized = false 32 | private val wrappedLazy by lazy { 33 | wrappedLazyInitialized = true 34 | Wrapped(true) 35 | } 36 | 37 | var x by wrapped::x.delegator() 38 | var y by wrapped::setY.delegator(initializedValue = 0) 39 | val yGetter by wrapped::getY.delegator() 40 | val z by wrapped::z.delegator() 41 | 42 | var x0 by delegateOf(wrapped::x, wrapped::x::set) 43 | var x1 by delegateOf(wrapped::setY) 44 | 45 | var y1 by delegateWithReceiverOf(wrapped, Wrapped::setY) 46 | var y2 by delegateOf(Wrapped::setY, wrapped) 47 | 48 | var y3 by delegateWithReceiverOf(wrapped, Wrapped::getY, Wrapped::setY) 49 | var y4 by delegateOf(Wrapped::getY, Wrapped::setY, wrapped) 50 | 51 | var xLazy by delegateLazyOf(Wrapped::x, Wrapped::x::set, false) { 52 | wrappedLazy 53 | } 54 | } 55 | 56 | class Wrapped(var x: Boolean) { 57 | val z = 10L 58 | fun setY(y: Int) { 59 | 60 | } 61 | 62 | fun getY() = 12 63 | } --------------------------------------------------------------------------------