package com.doumee.lib_coremodel.binding.command;
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import io.reactivex.functions.Function;
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/**
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* About : kelin的ResponseCommand
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* 执行的命令事件转换
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*/
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public class ResponseCommand<T, R> {
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private BindingFunction<R> execute;
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private Function<T, R> function;
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private BindingFunction<Boolean> canExecute;
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/**
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* like {@link BindingCommand},but ResponseCommand can return result when command has executed!
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*
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* @param execute function to execute when event occur.
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*/
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public ResponseCommand(BindingFunction<R> execute) {
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this.execute = execute;
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}
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public ResponseCommand(Function<T, R> execute) {
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this.function = execute;
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}
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public ResponseCommand(BindingFunction<R> execute, BindingFunction<Boolean> canExecute) {
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this.execute = execute;
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this.canExecute = canExecute;
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}
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public ResponseCommand(Function<T, R> execute, BindingFunction<Boolean> canExecute) {
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this.function = execute;
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this.canExecute = canExecute;
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}
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public R execute() {
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if (execute != null && canExecute()) {
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return execute.call();
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}
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return null;
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}
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private boolean canExecute() {
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if (canExecute == null) {
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return true;
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}
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return canExecute.call();
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}
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public R execute(T parameter) throws Exception {
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if (function != null && canExecute()) {
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return function.apply(parameter);
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}
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return null;
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}
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}
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