StackAddressFunction.java

package org.maltparser.parser.algorithm.stack;

import org.maltparser.core.exception.MaltChainedException;
import org.maltparser.core.feature.function.AddressFunction;
import org.maltparser.core.feature.value.AddressValue;
import org.maltparser.parser.Algorithm;
import org.maltparser.parser.ParsingException;

/**
 * @author Johan Hall
 *
 */
public class StackAddressFunction extends AddressFunction {

    public enum StackSubFunction {

        STACK, INPUT, LOOKAHEAD
    };
    private String subFunctionName;
    private StackSubFunction subFunction;
    private Algorithm parsingAlgorithm;
    private int index;

    public StackAddressFunction(String subFunctionName, Algorithm parsingAlgorithm) {
        super();
        setSubFunctionName(subFunctionName);
        setAlgorithm(parsingAlgorithm);
    }

    public void initialize(Object[] arguments) throws MaltChainedException {
        if (arguments.length != 1) {
            throw new ParsingException("Could not initialize " + this.getClass().getName() + ": number of arguments are not correct. ");
        }
        if (!(arguments[0] instanceof Integer)) {
            throw new ParsingException("Could not initialize " + this.getClass().getName() + ": the first argument is not an integer. ");
        }

        setIndex(((Integer) arguments[0]).intValue());
    }

    public Class<?>[] getParameterTypes() {
        Class<?>[] paramTypes = {java.lang.Integer.class};
        return paramTypes;
    }

    public void update() throws MaltChainedException {
        update((StackConfig) parsingAlgorithm.getCurrentParserConfiguration());
    }

    public void update(Object[] arguments) throws MaltChainedException {
//		if (arguments.length != 1 || !(arguments[0] instanceof StackConfig)) {
//			throw new ParsingException("Arguments to the Stack address function is not correct. ");
//		}
//		update((StackConfig)arguments[0]);

        if (subFunction == StackSubFunction.STACK) {
            address.setAddress(((StackConfig) arguments[0]).getStackNode(index));
        } else if (subFunction == StackSubFunction.LOOKAHEAD) {
            address.setAddress(((StackConfig) arguments[0]).getLookaheadNode(index));
        } else if (subFunction == StackSubFunction.INPUT) {
            address.setAddress(((StackConfig) arguments[0]).getInputNode(index));
        } else {
            address.setAddress(null);
        }
    }

    private void update(StackConfig config) throws MaltChainedException {
        if (subFunction == StackSubFunction.STACK) {
            address.setAddress(config.getStackNode(index));
        } else if (subFunction == StackSubFunction.LOOKAHEAD) {
            address.setAddress(config.getLookaheadNode(index));
        } else if (subFunction == StackSubFunction.INPUT) {
            address.setAddress(config.getInputNode(index));
        } else {
            address.setAddress(null);
        }
    }

    public String getSubFunctionName() {
        return subFunctionName;
    }

    public void setSubFunctionName(String subFunctionName) {
        this.subFunctionName = subFunctionName;
        subFunction = StackSubFunction.valueOf(subFunctionName.toUpperCase());
    }

    public StackSubFunction getSubFunction() {
        return subFunction;
    }

    @Override
    public AddressValue getAddressValue() {
        return address;
    }

    public Algorithm getParsingAlgorithm() {
        return parsingAlgorithm;
    }

    public void setAlgorithm(Algorithm parsingAlgorithm) {
        this.parsingAlgorithm = parsingAlgorithm;
    }

    public int getIndex() {
        return index;
    }

    public void setIndex(int index) {
        this.index = index;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }

        StackAddressFunction other = (StackAddressFunction) obj;
        if (index != other.index) {
            return false;
        }
        if (parsingAlgorithm == null) {
            if (other.parsingAlgorithm != null) {
                return false;
            }
        } else if (!parsingAlgorithm.equals(other.parsingAlgorithm)) {
            return false;
        }
        if (subFunction == null) {
            if (other.subFunction != null) {
                return false;
            }
        } else if (!subFunction.equals(other.subFunction)) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        sb.append(subFunctionName);
        sb.append('[');
        sb.append(index);
        sb.append(']');
        return sb.toString();
    }
}