Java tutorial
/******************************************************************************* * Copyright (C) 2011 The University of Manchester * * Modifications to the initial code base are copyright of their * respective authors, or their employers as appropriate. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 ******************************************************************************/ package net.sf.taverna.t2.activities.apiconsumer; import java.io.IOException; import java.net.URI; import java.util.HashSet; import java.util.Set; import net.sf.taverna.t2.workflowmodel.Edits; import net.sf.taverna.t2.workflowmodel.processor.activity.ActivityFactory; import net.sf.taverna.t2.workflowmodel.processor.activity.ActivityInputPort; import net.sf.taverna.t2.workflowmodel.processor.activity.ActivityOutputPort; import uk.org.taverna.configuration.app.ApplicationConfiguration; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.ObjectMapper; /** * An {@link ActivityFactory} for creating <code>ApiConsumerActivity</code>. * * @author David Withers */ public class ApiConsumerActivityFactory implements ActivityFactory { private ApplicationConfiguration applicationConfiguration; private Edits edits; @Override public ApiConsumerActivity createActivity() { return new ApiConsumerActivity(applicationConfiguration); } @Override public URI getActivityType() { return URI.create(ApiConsumerActivity.URI); } @Override public JsonNode getActivityConfigurationSchema() { ObjectMapper objectMapper = new ObjectMapper(); try { return objectMapper.readTree(getClass().getResource("/schema.json")); } catch (IOException e) { return objectMapper.createObjectNode(); } } @Override public Set<ActivityInputPort> getInputPorts(JsonNode json) { Set<ActivityInputPort> inputPorts = new HashSet<>(); // All non-static methods need the object to invoke the method on and it is // passed through the input port called 'object'. Non-static methods and constructors // also return the same object through the output port called 'object' if (!json.get("isMethodStatic").asBoolean() && !json.get("isMethodConstructor").asBoolean()) { inputPorts.add(edits.createActivityInputPort("object", 0, false, null, null)); } // Add input ports for method's parameters JsonNode parameterNames = json.get("parameterNames"); JsonNode parameterTypes = json.get("parameterTypes"); JsonNode parameterDimensions = json.get("parameterDimensions"); for (int i = 0; i < parameterNames.size(); i++) { // Create input ports... if (ApiConsumerActivity.canRegisterAsString(parameterTypes.get(i).textValue())) { if (parameterTypes.get(i).textValue().equals("char")) { // char, char[] are treated as a string (where char is a string with only one character), // so the port depth for char[] is 0 rather than 1 as is expected for an array if (parameterDimensions.get(i).intValue() == 0 || parameterDimensions.get(i).intValue() == 1) { inputPorts.add(edits.createActivityInputPort(parameterNames.get(i).textValue(), 0, true, null, String.class)); } // char[][], etc. else { inputPorts.add(edits.createActivityInputPort(parameterNames.get(i).textValue(), parameterDimensions.get(i).intValue() - 1, true, null, String.class)); } } else { inputPorts.add(edits.createActivityInputPort(parameterNames.get(i).textValue(), parameterDimensions.get(i).intValue(), true, null, String.class)); } } else if (parameterTypes.get(i).textValue().equals("byte")) { // byte, byte[] are treated as a stream of depth 0 rather that array of bytes of depth 1. // byte is treated as byte[] with only one element. // Note that the port depth is set to 0 rather than 1 as is expected for an array if (parameterDimensions.get(i).intValue() == 0 || parameterDimensions.get(i).intValue() == 1) { inputPorts.add(edits.createActivityInputPort(parameterNames.get(i).textValue(), 0, true, null, byte[].class)); } // byte[][], etc. else { inputPorts.add(edits.createActivityInputPort(parameterNames.get(i).textValue(), parameterDimensions.get(i).intValue() - 1, true, null, byte[].class)); } } else { //POJO inputPorts.add(edits.createActivityInputPort(parameterNames.get(i).textValue(), parameterDimensions.get(i).intValue(), false, null, null)); } } return inputPorts; } @Override public Set<ActivityOutputPort> getOutputPorts(JsonNode json) { Set<ActivityOutputPort> outputPorts = new HashSet<>(); // All non-static methods need the object to invoke the method on and it is // passed through the input port called 'object'. Non-static methods and constructors // also return the same object through the output port called 'object' if (!json.get("isMethodStatic").asBoolean()) { outputPorts.add(edits.createActivityOutputPort("object", 0, 0)); } // Add output port 'result' for the return value of non-void methods String returnType = json.get("returnType").textValue(); int returnDimension = json.get("returnDimension").intValue(); if (!returnType.equals("void") && !json.get("isMethodConstructor").asBoolean()) { // byte[] return type maps to port dimension 0! It is treated as a stream rather than a list of bytes. // Similar for char and char[] - not implemented yet if (returnType.equals("byte") && returnDimension == 1) { outputPorts.add(edits.createActivityOutputPort("result", 0, 0)); } else outputPorts.add(edits.createActivityOutputPort("result", returnDimension, returnDimension)); } return outputPorts; } public void setEdits(Edits edits) { this.edits = edits; } public void setApplicationConfiguration(ApplicationConfiguration applicationConfiguration) { this.applicationConfiguration = applicationConfiguration; } }