Example usage for java.util Deque getFirst

Introduction

In this page you can find the example usage for java.util Deque getFirst.

Prototype

E getFirst();

Source Link

Document

Retrieves, but does not remove, the first element of this deque.

Usage

From source file:Main.java

public static void main(String[] args) {

    Deque<Integer> deque = new ArrayDeque<Integer>(8);

    deque.add(15);/*from  w w w.j  a v  a 2  s.c o m*/
    deque.add(30);
    deque.add(20);
    deque.add(18);

    System.out.println(deque);

    int retval = deque.getFirst();
    System.out.println("Retrieved Element is = " + retval);
}

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From source file:Main.java

public static void main(String[] args) {
    Deque<String> deque = new LinkedList<>();
    deque.addLast("Oracle");
    deque.offerLast("Java");
    deque.offerLast("CSS");
    deque.offerLast("XML");

    System.out.println("Deque: " + deque);

    // remove elements from the Deque until it is empty
    while (deque.peekFirst() != null) {
        System.out.println("Head  Element: " + deque.peekFirst());
        deque.removeFirst();//from   w  ww  . j  a  va  2  s . c om
        System.out.println("Removed one  element from  Deque");
        System.out.println("Deque: " + deque);
    }

    // the Deque is empty. Try to call its peekFirst(),
    // getFirst(), pollFirst() and removeFirst() methods
    System.out.println("deque.isEmpty(): " + deque.isEmpty());

    System.out.println("deque.peekFirst(): " + deque.peekFirst());
    System.out.println("deque.pollFirst(): " + deque.pollFirst());

    String str = deque.getFirst();
    System.out.println("deque.getFirst(): " + str);
    str = deque.removeFirst();
    System.out.println("deque.removeFirst(): " + str);

}

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From source file:org.openscore.lang.compiler.scorecompiler.ExecutionPlanBuilder.java

public ExecutionPlan createFlowExecutionPlan(Flow compiledFlow) {
    ExecutionPlan executionPlan = new ExecutionPlan();
    executionPlan.setName(compiledFlow.getName());
    executionPlan.setLanguage(SLANG_NAME);
    executionPlan.setFlowUuid(compiledFlow.getId());

    executionPlan.setBeginStep(FLOW_START_STEP_ID);
    //flow start step
    executionPlan.addStep(stepFactory.createStartStep(FLOW_START_STEP_ID, compiledFlow.getPreExecActionData(),
            compiledFlow.getInputs(), compiledFlow.getName()));
    //flow end step
    executionPlan.addStep(stepFactory.createEndStep(FLOW_END_STEP_ID, compiledFlow.getPostExecActionData(),
            compiledFlow.getOutputs(), compiledFlow.getResults(), compiledFlow.getName()));

    Map<String, Long> taskReferences = new HashMap<>();
    for (Result result : compiledFlow.getResults()) {
        taskReferences.put(result.getName(), FLOW_END_STEP_ID);
    }/*from   ww  w  . j  a v  a  2  s  .  c  o  m*/

    Deque<Task> tasks = compiledFlow.getWorkflow().getTasks();

    if (CollectionUtils.isEmpty(tasks)) {
        throw new RuntimeException("Flow: " + compiledFlow.getName() + " has no tasks");
    }

    List<ExecutionStep> taskExecutionSteps = buildTaskExecutionSteps(tasks.getFirst(), taskReferences, tasks);
    executionPlan.addSteps(taskExecutionSteps);

    return executionPlan;
}

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From source file:io.cloudslang.lang.compiler.CompileAsyncLoopFlowTest.java

@Test
public void testPreCompileAsyncLoopFlowNavigate() throws Exception {
    Deque<Task> tasks = getTasksAfterPrecompileFlow("/loops/async_loop/async_loop_navigate.sl");
    assertEquals(2, tasks.size());//from   w  w  w.j a  v a  2 s.c  om

    Task asyncTask = tasks.getFirst();

    verifyAsyncLoopStatement(asyncTask);

    List<Output> aggregateValues = getAggregateOutputs(asyncTask);
    assertEquals(0, aggregateValues.size());

    List<Output> publishValues = getPublishOutputs(asyncTask);
    assertEquals("aggregate list is not empty", 0, publishValues.size());

    Map<String, String> expectedNavigationStrings = new HashMap<>();
    expectedNavigationStrings.put("SUCCESS", "print_list");
    expectedNavigationStrings.put("FAILURE", "FAILURE");
    verifyNavigationStrings(expectedNavigationStrings, asyncTask);

    assertTrue(asyncTask.isAsync());
}

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From source file:io.cloudslang.lang.compiler.CompileAsyncLoopFlowTest.java

@Test
public void testPreCompileAsyncLoopFlowAggregateNavigate() throws Exception {
    Deque<Task> tasks = getTasksAfterPrecompileFlow("/loops/async_loop/async_loop_aggregate_navigate.sl");
    assertEquals(2, tasks.size());//from   www  .ja  v a2s  . c  o m

    Task asyncTask = tasks.getFirst();

    verifyAsyncLoopStatement(asyncTask);

    List<Output> aggregateValues = getAggregateOutputs(asyncTask);
    assertEquals(2, aggregateValues.size());
    assertEquals("${ map(lambda x:str(x['name']), branches_context) }", aggregateValues.get(0).getValue());

    List<Output> publishValues = getPublishOutputs(asyncTask);
    assertEquals("aggregate list is not empty", 2, publishValues.size());
    assertEquals("${name}", publishValues.get(0).getValue());

    Map<String, String> expectedNavigationStrings = new HashMap<>();
    expectedNavigationStrings.put("SUCCESS", "print_list");
    expectedNavigationStrings.put("FAILURE", "FAILURE");
    verifyNavigationStrings(expectedNavigationStrings, asyncTask);

    assertTrue(asyncTask.isAsync());
}

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From source file:io.cloudslang.lang.compiler.scorecompiler.ExecutionPlanBuilder.java

public ExecutionPlan createFlowExecutionPlan(Flow compiledFlow) {
    ExecutionPlan executionPlan = new ExecutionPlan();
    executionPlan.setName(compiledFlow.getName());
    executionPlan.setLanguage(CLOUDSLANG_NAME);
    executionPlan.setFlowUuid(compiledFlow.getId());
    executionPlan.setWorkerGroup(compiledFlow.getWorkerGroup());

    executionPlan.setBeginStep(FLOW_START_STEP_ID);
    //flow start step
    executionPlan.addStep(stepFactory.createStartStep(FLOW_START_STEP_ID, compiledFlow.getPreExecActionData(),
            compiledFlow.getInputs(), compiledFlow.getName(), ExecutableType.FLOW));
    //flow end step
    executionPlan.addStep(stepFactory.createEndStep(FLOW_END_STEP_ID, compiledFlow.getPostExecActionData(),
            compiledFlow.getOutputs(), compiledFlow.getResults(), compiledFlow.getName(), ExecutableType.FLOW));

    Map<String, Long> stepReferences = getStepReferences(compiledFlow);

    Deque<Step> steps = compiledFlow.getWorkflow().getSteps();

    if (CollectionUtils.isEmpty(steps)) {
        throw new RuntimeException("Flow: " + compiledFlow.getName() + " has no steps");
    }/*from w w w. j  a  v  a 2s . c om*/

    List<ExecutionStep> stepExecutionSteps = buildStepExecutionSteps(steps.getFirst(), stepReferences, steps,
            compiledFlow);
    executionPlan.addSteps(stepExecutionSteps);

    return executionPlan;
}

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From source file:io.cloudslang.lang.compiler.CompileParallelLoopFlowTest.java

@Test
public void testPreCompileParallelLoopFlowNavigate() throws Exception {
    Deque<Step> steps = getStepsAfterPrecompileFlow("/loops/parallel_loop/parallel_loop_navigate.sl");
    assertEquals(2, steps.size());// w w w.ja  va 2s .  c o m

    Step parallelStep = steps.getFirst();

    verifyParallelLoopStatement(parallelStep);

    List<Output> publishValues = getPublishOutputs(parallelStep);
    assertEquals(0, publishValues.size());

    List<Map<String, String>> expectedNavigationStrings = new ArrayList<>();
    Map<String, String> successMap = new HashMap<>();
    successMap.put(ScoreLangConstants.SUCCESS_RESULT, "print_list");
    Map<String, String> failureMap = new HashMap<>();
    failureMap.put(ScoreLangConstants.FAILURE_RESULT, "FAILURE");
    expectedNavigationStrings.add(successMap);
    expectedNavigationStrings.add(failureMap);
    verifyNavigationStrings(expectedNavigationStrings, parallelStep);

    assertTrue(parallelStep.isParallelLoop());
}

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From source file:io.cloudslang.lang.compiler.CompileParallelLoopFlowTest.java

@Test
public void testPreCompileParallelLoopFlowPublishNavigate() throws Exception {
    Deque<Step> steps = getStepsAfterPrecompileFlow("/loops/parallel_loop/parallel_loop_publish_navigate.sl");
    assertEquals(2, steps.size());//from  w ww . ja  v  a  2 s  .  c  om

    Step parallelStep = steps.getFirst();

    verifyParallelLoopStatement(parallelStep);

    List<Output> publishValues = getPublishOutputs(parallelStep);
    assertEquals(2, publishValues.size());
    assertEquals("${ map(lambda x:str(x['name']), branches_context) }", publishValues.get(0).getValue().get());

    List<Map<String, String>> expectedNavigationStrings = new ArrayList<>();
    Map<String, String> successMap = new HashMap<>();
    successMap.put(ScoreLangConstants.SUCCESS_RESULT, "print_list");
    Map<String, String> failureMap = new HashMap<>();
    failureMap.put(ScoreLangConstants.FAILURE_RESULT, "FAILURE");
    expectedNavigationStrings.add(successMap);
    expectedNavigationStrings.add(failureMap);
    verifyNavigationStrings(expectedNavigationStrings, parallelStep);

    assertTrue(parallelStep.isParallelLoop());
}

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From source file:ninja.undertow.NinjaUndertowContext.java

@Override
public String getParameter(String name) {
    // Returns the value of a request parameter as a String, or null if the
    // parameter does not exist. Request parameters are extra information sent
    // with the request. For ninja (following servlet rule), parameters are contained in the
    // query string or posted form data.
    Deque<String> queryParameterValues = exchange.getQueryParameters().get(name);

    if (queryParameterValues != null && !queryParameterValues.isEmpty()) {
        return queryParameterValues.getFirst();
    } else {/*from w ww  . ja  va  2s  . c o  m*/
        // fallback to form data
        if (this.formData != null) {
            FormData.FormValue value = this.formData.getFirst(name);
            if (value != null) {
                return value.getValue();
            }
        }
    }

    return null;
}

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