001/**
002 * Copyright (c) 2025-2026, Michael Yang 杨福海 (fuhai999@gmail.com).
003 * <p>
004 * Licensed under the GNU Lesser General Public License (LGPL) ,Version 3.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 * <p>
008 * http://www.gnu.org/licenses/lgpl-3.0.txt
009 * <p>
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package dev.tinyflow.core.node;
017
018import com.jfinal.template.Engine;
019import com.jfinal.template.Template;
020import dev.tinyflow.core.chain.Chain;
021import dev.tinyflow.core.chain.Parameter;
022import dev.tinyflow.core.util.Maps;
023import dev.tinyflow.core.util.StringUtil;
024
025import java.io.ByteArrayOutputStream;
026import java.util.List;
027import java.util.Map;
028
029public class TemplateNode extends BaseNode {
030
031    private static final Engine engine;
032    private String template;
033
034    static {
035        engine = Engine.create("template", e -> {
036            e.addSharedStaticMethod(StringUtil.class);
037        });
038    }
039
040    public String getTemplate() {
041        return template;
042    }
043
044    public void setTemplate(String template) {
045        this.template = template;
046    }
047
048
049    @Override
050    public Map<String, Object> execute(Chain chain) {
051        Map<String, Object> parameters = chain.getState().resolveParameters(this);
052
053        ByteArrayOutputStream result = new ByteArrayOutputStream();
054
055        Template templateByString = engine.getTemplateByString(template);
056        templateByString.render(parameters, result);
057
058        String outputDef = "output";
059        List<Parameter> outputDefs = getOutputDefs();
060        if (outputDefs != null && !outputDefs.isEmpty()) {
061            String parameterName = outputDefs.get(0).getName();
062            if (StringUtil.hasText(parameterName)) outputDef = parameterName;
063        }
064
065        return Maps.of(outputDef, result.toString());
066    }
067
068
069    @Override
070    public String toString() {
071        return "TemplateNode{" +
072                "template='" + template + '\'' +
073                ", parameters=" + parameters +
074                ", outputDefs=" + outputDefs +
075                ", id='" + id + '\'' +
076                ", name='" + name + '\'' +
077                ", description='" + description + '\'' +
078                ", condition=" + condition +
079                ", validator=" + validator +
080                ", loopEnable=" + loopEnable +
081                ", loopIntervalMs=" + loopIntervalMs +
082                ", loopBreakCondition=" + loopBreakCondition +
083                ", maxLoopCount=" + maxLoopCount +
084                ", retryEnable=" + retryEnable +
085                ", resetRetryCountAfterNormal=" + resetRetryCountAfterNormal +
086                ", maxRetryCount=" + maxRetryCount +
087                ", retryIntervalMs=" + retryIntervalMs +
088                ", computeCostExpr='" + computeCostExpr + '\'' +
089                '}';
090    }
091}