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QLExpress is a powerful, lightweight, dynamic language for the Java platform aimed at improving developers’ productivity in different business scenes.
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package com.ql.util.express;

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

import com.ql.util.express.exception.QLException;
import com.ql.util.express.instruction.OperateDataCacheManager;

public class InstructionSetContext implements IExpressContext {
    /**
     * 没有知道数据类型的变量定义是否传递到最外层的Context
     */
    private boolean isExpandToParent = true;

    private IExpressContext parent = null;
    private Map content;

    /**
     * 符号表
     */
    private final Map symbolTable = new HashMap<>();

    private ExpressLoader expressLoader;

    private boolean isSupportDynamicFieldName = false;

    private ExpressRunner runner;

    public ExpressRunner getRunner() {
        return runner;
    }

    public InstructionSetContext(boolean isExpandToParent, ExpressRunner expressRunner,
        IExpressContext parent, ExpressLoader expressLoader, boolean isSupportDynamicFieldName) {
        this.initial(isExpandToParent, expressRunner, parent, expressLoader, isSupportDynamicFieldName);
    }

    public void initial(boolean isExpandToParent, ExpressRunner expressRunner, IExpressContext parent,
        ExpressLoader expressLoader, boolean isSupportDynamicFieldName) {
        this.isExpandToParent = isExpandToParent;
        this.runner = expressRunner;
        this.parent = parent;
        this.expressLoader = expressLoader;
        this.isSupportDynamicFieldName = isSupportDynamicFieldName;
    }

    public void clear() {
        isExpandToParent = true;
        parent = null;
        content = null;
        expressLoader = null;
        isSupportDynamicFieldName = false;
        runner = null;
        symbolTable.clear();
    }

    public void exportSymbol(String varName, Object aliasNameObject) throws Exception {
        if (this.parent instanceof InstructionSetContext) {
            ((InstructionSetContext)this.parent).exportSymbol(varName, aliasNameObject);
        } else {
            this.addSymbol(varName, aliasNameObject);
        }
    }

    public void addSymbol(String varName, Object aliasNameObject) throws Exception {
        if (this.symbolTable.containsKey(varName)) {
            throw new QLException("变量" + varName + "已经存在，不能重复定义，也不能再从函数内部 export");
        }
        this.symbolTable.put(varName, aliasNameObject);
    }

    public void addSymbol(Map aliasNameObjects) {
        this.symbolTable.putAll(aliasNameObjects);
    }

    public void setSupportDynamicFieldName(boolean isSupportDynamicFieldName) {
        this.isSupportDynamicFieldName = isSupportDynamicFieldName;
    }

    public boolean isSupportDynamicFieldName() {
        return this.isSupportDynamicFieldName;
    }

    public ExpressRunner getExpressRunner() {
        return this.runner;
    }

    public Object findAliasOrDefSymbol(String varName) {
        Object result = this.symbolTable.get(varName);
        if (result == null && this.parent instanceof InstructionSetContext) {
            result = ((InstructionSetContext)this.parent).findAliasOrDefSymbol(varName);
        }
        return result;
    }

    public Object getSymbol(String varName) throws Exception {
        Object result = this.symbolTable.get(varName);
        if (result == null && this.expressLoader != null) {
            result = this.expressLoader.getInstructionSet(varName);
        }
        if (result == null) {
            if (this.isExpandToParent && this.parent != null
                && this.parent instanceof InstructionSetContext) {
                result = ((InstructionSetContext)this.parent).getSymbol(varName);
            } else {
                result = OperateDataCacheManager.fetchOperateDataAttr(varName, null);
                this.addSymbol(varName, result);
            }
        }
        return result;
    }

    public ExpressLoader getExpressLoader() {
        return expressLoader;
    }

    public IExpressContext getParent() {
        return this.parent;
    }

    @Override
    public Object get(Object key) {
        if (this.content != null && this.content.containsKey(key)) {
            return this.content.get(key);
        } else if (this.isExpandToParent && this.parent != null) {
            return this.parent.get(key);
        }
        return null;
    }

    @Override
    public Object put(String key, Object value) {
        if (this.content != null && this.content.containsKey(key)) {
            return this.content.put(key, value);
        } else if (!this.isExpandToParent) {
            if (this.content == null) {
                this.content = new HashMap<>();
            }
            return this.content.put(key, value);
        } else if (this.parent != null) {
            return this.parent.put(key, value);
        } else {
            throw new RuntimeException("没有定义局部变量：" + key + ",而且没有全局上下文");
        }
    }
}