com.scudata.ide.spl.etl.element.AJoin Maven / Gradle / Ivy

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SPL(Structured Process Language) A programming language specially for structured data computing.
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package com.scudata.ide.spl.etl.element;

import java.util.ArrayList;
import java.util.StringTokenizer;

import com.scudata.chart.Consts;
import com.scudata.common.StringUtils;
import com.scudata.ide.spl.etl.EtlConsts;
import com.scudata.ide.spl.etl.FieldDefine;
import com.scudata.ide.spl.etl.ObjectElement;
import com.scudata.ide.spl.etl.ParamInfo;
import com.scudata.ide.spl.etl.ParamInfoList;

/**
 * ?????????༭ A.join()
 * ??????ǰ׺A??ʾ???
 * 
 * @author Joancy
 *
 */
public class AJoin extends ObjectElement {
	public ArrayList foreignKeys;
	public String joinTable;
	public ArrayList joinKeys;// ???ӵ???????ú???????A.keys(keys)ʱ?????????ʡ??

	public ArrayList attachFields;// ???Ӻ󸽼??ڵ?ǰA??ı???ʽ?Լ?????ֶ???????ʹ??FieldDefine?ĵ?????

	public boolean i;

	// public boolean o;//?Ȳ?ʵ??oѡ??

	/**
	 * ??ȡ???ڽ???༭?Ĳ?????Ϣ?б?
	 */
	public ParamInfoList getParamInfoList() {
		ParamInfoList paramInfos = new ParamInfoList();
		ParamInfo.setCurrent(AJoin.class, this);

		paramInfos
				.add(new ParamInfo("foreignKeys", EtlConsts.INPUT_STRINGLIST));
		paramInfos.add(new ParamInfo("joinTable", EtlConsts.INPUT_CELLA, true));
		paramInfos.add(new ParamInfo("joinKeys", EtlConsts.INPUT_STRINGLIST));
		paramInfos.add(new ParamInfo("attachFields",
				EtlConsts.INPUT_FIELDDEFINE_EXP_FIELD));

		String group = "options";
		paramInfos.add(group, new ParamInfo("i", Consts.INPUT_CHECKBOX));

		return paramInfos;
	}

	/**
	 * ??ȡ??????
	 * ???͵ĳ???????Ϊ
	 * EtlConsts.TYPE_XXX
	 * @return ǰ׺A??ͷ?ĺ???????????EtlConsts.TYPE_SEQUENCE
	 */
	public byte getParentType() {
		return EtlConsts.TYPE_SEQUENCE;
	}

	/**
	 * ??ȡ?ú????ķ???????
	 * @return EtlConsts.TYPE_SEQUENCE
	 */
	public byte getReturnType() {
		return EtlConsts.TYPE_SEQUENCE;
	}

	/**
	 * ??ȡ????????SPL????ʽ??ѡ?
	 */
	public String optionString() {
		StringBuffer options = new StringBuffer();
		if (i) {
			options.append("i");
		}
		return options.toString();
	}

	/**
	 * ??ȡ????????SPL????ʽ?ĺ?????
	 */
	public String getFuncName() {
		return "join";
	}

	/**
	 * ??ȡ????????SPL????ʽ?ĺ?????
	 * ??setFuncBody???溯????Ȼ?????ʽ?ĸ?ֵҲ???ǻ????
	 */
	public String getFuncBody() {
		StringBuffer sb = new StringBuffer();
		sb.append(getStringListExp(foreignKeys, ":"));
		sb.append(",");
		sb.append(getExpressionExp(joinTable));

		String buf = getStringListExp(joinKeys, ":");
		if (StringUtils.isValidString(buf)) {
			sb.append(":");
			sb.append(buf);
		}

		buf = getFieldDefineExp(attachFields);
		if (!buf.isEmpty()) {
			sb.append(",");
			sb.append(buf);
		}
		return sb.toString();
	}

	/**
	 * ???ú?????
	 * @param funcBody ??????
	 */
	public boolean setFuncBody(String funcBody) {
		StringTokenizer st = new StringTokenizer(funcBody, ",");
		String tmp = st.nextToken();
		foreignKeys = getStringList(tmp, ":");
		tmp = st.nextToken();
		int index = tmp.indexOf(":");
		if (index < 0) {
			return false;
		}
		joinTable = getExpression(tmp.substring(0, index));
		joinKeys = getStringList(tmp.substring(index + 1), ":");

		if (st.hasMoreTokens()) {
			tmp = st.nextToken();
			attachFields = getFieldDefine(tmp);
		}
		return true;
	}

}