Example usage for edu.stanford.nlp.trees HeadFinder determineHead

Introduction

In this page you can find the example usage for edu.stanford.nlp.trees HeadFinder determineHead.

Prototype

public Tree determineHead(Tree t);

Source Link

Document

Determine which daughter of the current parse tree is the head.

Usage

From source file:edu.jhu.hlt.concrete.stanford.PreNERCoreMapWrapper.java

License:Open Source License

/**
*
* @param root//from w w w.  j a  v  a 2s.  c o  m
* @param left
* @param right
* @param n
*          is the length of the sentence is tokens.
* @param p
* @param tokenizationUUID
* @return The constituent ID
* @throws AnalyticException
*/
private static int constructConstituent(Tree root, int left, int right, int n, Parse p, UUID tokenizationUUID,
        HeadFinder hf) throws AnalyticException {

    Constituent constituent = new Constituent();
    constituent.setId(p.getConstituentListSize());
    constituent.setTag(root.value());
    constituent.setStart(left);
    constituent.setEnding(right);
    p.addToConstituentList(constituent);
    Tree headTree = null;
    if (!root.isLeaf()) {
        try {
            headTree = hf.determineHead(root);
        } catch (java.lang.IllegalArgumentException iae) {
            LOGGER.warn("Failed to find head, falling back on rightmost constituent.");
            headTree = root.children()[root.numChildren() - 1];
        }
    }
    int i = 0, headTreeIdx = -1;

    int leftPtr = left;
    for (Tree child : root.getChildrenAsList()) {
        int width = child.getLeaves().size();
        int childId = constructConstituent(child, leftPtr, leftPtr + width, n, p, tokenizationUUID, hf);
        constituent.addToChildList(childId);

        leftPtr += width;
        if (headTree != null && child == headTree) {
            assert (headTreeIdx < 0);
            headTreeIdx = i;
        }
        i++;
    }

    if (headTreeIdx >= 0)
        constituent.setHeadChildIndex(headTreeIdx);

    if (!constituent.isSetChildList())
        constituent.setChildList(new ArrayList<Integer>());
    return constituent.getId();
}

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