content: /*
   * Copyright 2024-2025 the original author or authors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.alibaba.cloud.ai.graph.agent.flow.node;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import com.alibaba.cloud.ai.graph.OverAllState;
  import com.alibaba.cloud.ai.graph.action.NodeAction;
  
  /**
   * A node action that aggregates results from parallel execution of multiple agents. This
   * class collects outputs from parallel agents and combines them into a single result.
   */
  public class ParallelResultAggregator implements NodeAction {
  
  	private final String outputKey;
  
  	public ParallelResultAggregator(String outputKey) {
  		this.outputKey = outputKey;
  	}
  
  	@Override
  	public Map<String, Object> apply(OverAllState state) throws Exception {
  		Map<String, Object> updatedState = new HashMap<>();
  
  		// Collect all agent results
  		Map<String, Object> aggregatedResults = new HashMap<>();
  
  		// Iterate through all state data to find agent outputs
  		Map<String, Object> stateData = state.data();
  		for (Map.Entry<String, Object> entry : stateData.entrySet()) {
  			String key = entry.getKey();
  			Object value = entry.getValue();
  			if (value != null && !key.equals("messages")) { // Skip system keys like
  				// messages
  				aggregatedResults.put(key, value);
  			}
  		}
  
  		// Create a summary or combined result
  		StringBuilder combinedResult = new StringBuilder();
  		combinedResult.append("Parallel execution results:\n");
  
  		for (Map.Entry<String, Object> entry : aggregatedResults.entrySet()) {
  			combinedResult.append("- ").append(entry.getKey()).append(": ").append(entry.getValue()).append("\n");
  		}
  
  		updatedState.put(this.outputKey, combinedResult.toString());
  		return updatedState;
  	}
  
  	public static Builder builder() {
  		return new Builder();
  	}
  
  	public static class Builder {
  
  		private String outputKey;
  
  		public Builder outputKey(String outputKey) {
  			this.outputKey = outputKey;
  			return this;
  		}
  
  		public ParallelResultAggregator build() {
  			if (outputKey == null || outputKey.trim().isEmpty()) {
  				throw new IllegalArgumentException("outputKey must not be null or empty");
  			}
  			return new ParallelResultAggregator(outputKey);
  		}
  
  	}
  
  }
  