com.iqiny.silly.spring.spel.SillySpelPropertyHandle Maven / Gradle / Ivy

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/*
 *  Copyright  iqiny.com
 *
 *  https://gitee.com/iqiny/silly
 *
 *  project name：silly-spring
 *  project description：top silly project pom.xml file
 */
package com.iqiny.silly.spring.spel;

import com.iqiny.silly.common.SillyConstant;
import com.iqiny.silly.common.exception.SillyException;
import com.iqiny.silly.common.util.SillyAssert;
import com.iqiny.silly.common.util.StringUtils;
import com.iqiny.silly.core.base.SillyContext;
import com.iqiny.silly.core.config.property.SillyPropertyHandle;
import org.springframework.expression.Expression;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;

import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

/**
 * 集成 SPEL 表达式配置
 */
public class SillySpelPropertyHandle implements SillyPropertyHandle {

    public static final String EL_START = "${" ;
    public static final String EL_END = "}" ;

    private StandardEvaluationContext context;
    private SillyContext sillyContext;
    private Map values;
    private Map root;
    private Map nodeRoot;

    public StandardEvaluationContext getContext() {
        if (context == null) {
            HashMap rootMap = new HashMap<>(256);
            if (root != null) {
                rootMap.putAll(root);
            }
            if (nodeRoot != null) {
                rootMap.putAll(nodeRoot);
            }
            context = new StandardEvaluationContext(rootMap);
            context.setBeanResolver(new SillyBeanResolver(sillyContext));
            context.setVariables(getValues());
        }
        return context;
    }

    public SillySpelPropertyHandle setContext(StandardEvaluationContext context) {
        this.context = context;
        return this;
    }

    @Override
    public Map getValues() {
        return values;
    }

    public SillySpelPropertyHandle setValues(Map values) {
        this.values = values;
        return this;
    }

    public boolean isSillySpel(String str) {
        if (StringUtils.isEmpty(str)) {
            return false;
        }

        int start = str.indexOf(EL_START);
        int end = str.lastIndexOf(EL_END);
        return start < end;
    }

    public Object getSpelValue(String expression) {
        int start = expression.indexOf(EL_START);
        int end = expression.lastIndexOf(EL_END);
        String substring = expression.substring(start + EL_START.length(), end);
        return doGetSpelValue(substring);
    }

    protected Object doGetSpelValue(String expression) {
        ExpressionParser parser = new SpelExpressionParser();
        Expression exp = parser.parseExpression(expression);
        try {
            return exp.getValue(getContext());
        } catch (Exception e) {
            if (e.getCause() != null) {
                throw new SillyException("[" + expression + "]:" + e.getCause().getMessage(), e);
            } else {
                throw new SillyException("SPEL解析异常[" + expression + "]:" + e.getMessage(), e);
            }
        }
    }

    @Override
    public void setRoot(Map root) {
        this.root = root;
    }

    public Map getNodeRoot() {
        return nodeRoot;
    }

    @Override
    public void setNodeRoot(Map nodeRoot) {
        this.nodeRoot = nodeRoot;
    }

    @Override
    public Object getValue(String expression) {
        return isSillySpel(expression) ? getSpelValue(expression) : expression;
    }

    @Override
    public boolean getBooleanValue(String expression) {
        if (StringUtils.isEmpty(expression)) {
            return false;
        }

        Object value = getValue(expression);
        if (value instanceof Boolean) {
            return (boolean) value;
        }

        if (Objects.equals(value, SillyConstant.YesOrNo.YES)) {
            return true;
        }
        return Boolean.parseBoolean(expression);
    }

    @Override
    public void setValues(Object values) {
        SillyAssert.notNull(values, "配置处理器上下文对象不可为null");
        SillyAssert.isTrue(values instanceof Map, "配置处理器类型不支持" + values.getClass());
        setValues((Map) values);
    }

    @Override
    public void setSillyContext(SillyContext sillyContext) {
        this.sillyContext = sillyContext;
    }

    @Override
    public  T updateValue(String key, T value) {
        T oldValue = (T) values.put(key, value);
        getContext().setVariable(key, value);
        return oldValue;
    }

    @Override
    public void updateIfAbsent(String key, Object value) {
        Object o = values.putIfAbsent(key, value);
        if (o == null) {
            getContext().setVariable(key, value);
        }
    }

    @Override
    public String warpFieldToExpression(String fieldName) {
        return EL_START + "#" + fieldName + EL_END;
    }

}