FunctionDescription.java

package org.maltparser.core.feature.system;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import org.maltparser.core.config.ConfigurationRegistry;
import org.maltparser.core.exception.MaltChainedException;
import org.maltparser.core.feature.AbstractFeatureFactory;
import org.maltparser.core.feature.FeatureException;
import org.maltparser.core.feature.function.Function;

/**
 *
 *
 * @author Johan Hall
 * @since 1.0
*
 */
public class FunctionDescription {

    private String name;
    private Class<?> functionClass;
    private boolean hasSubfunctions;
    private boolean hasFactory;

//	public FunctionDescription(String name, Class<?> functionClass, boolean hasSubfunctions) {
//		setName(name);
//		setFunctionClass(functionClass);
//		setHasSubfunctions(hasSubfunctions);
//	}
    public FunctionDescription(String name, Class<?> functionClass, boolean hasSubfunctions, boolean hasFactory) {
        setName(name);
        setFunctionClass(functionClass);
        setHasSubfunctions(hasSubfunctions);
        setHasFactory(hasFactory);
    }

    public Function newFunction(ConfigurationRegistry registry) throws MaltChainedException {
        if (hasFactory) {
            for (Class<?> c : registry.keySet()) {
                try {
                    c.asSubclass(functionClass);
                } catch (ClassCastException e) {
                    continue;
                }
                return ((AbstractFeatureFactory) registry.get(c)).makeFunction(name);
            }
            return null;
        }
        Constructor<?>[] constructors = functionClass.getConstructors();
        if (constructors.length == 0) {
            try {
                return (Function) functionClass.newInstance();
            } catch (InstantiationException e) {
                throw new FeatureException("The function '" + functionClass.getName() + "' cannot be initialized. ", e);
            } catch (IllegalAccessException e) {
                throw new FeatureException("The function '" + functionClass.getName() + "' cannot be initialized. ", e);
            }
        }
        Class<?>[] params = constructors[0].getParameterTypes();
        if (params.length == 0) {
            try {
                return (Function) functionClass.newInstance();
            } catch (InstantiationException e) {
                throw new FeatureException("The function '" + functionClass.getName() + "' cannot be initialized. ", e);
            } catch (IllegalAccessException e) {
                throw new FeatureException("The function '" + functionClass.getName() + "' cannot be initialized. ", e);
            }
        }
        Object[] arguments = new Object[params.length];
        for (int i = 0; i < params.length; i++) {
            if (hasSubfunctions && params[i] == java.lang.String.class) {
                arguments[i] = name;
            } else {
                arguments[i] = registry.get(params[i]);
                if (arguments[i] == null) {
                    return null;
                }
            }
        }
        try {
            return (Function) constructors[0].newInstance(arguments);
        } catch (InstantiationException e) {
            throw new FeatureException("The function '" + functionClass.getName() + "' cannot be initialized. ", e);
        } catch (IllegalAccessException e) {
            throw new FeatureException("The function '" + functionClass.getName() + "' cannot be initialized. ", e);
        } catch (InvocationTargetException e) {
            throw new FeatureException("The function '" + functionClass.getName() + "' cannot be initialized. ", e);
        }
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Class<?> getFunctionClass() {
        return functionClass;
    }

    public void setFunctionClass(Class<?> functionClass) {
        this.functionClass = functionClass;
    }

    public boolean isHasSubfunctions() {
        return hasSubfunctions;
    }

    public void setHasSubfunctions(boolean hasSubfunctions) {
        this.hasSubfunctions = hasSubfunctions;
    }

    public boolean isHasFactory() {
        return hasFactory;
    }

    public void setHasFactory(boolean hasFactory) {
        this.hasFactory = hasFactory;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        if (!(name.equalsIgnoreCase(((FunctionDescription) obj).getName()))) {
            return false;
        } else if (!(functionClass.equals(((FunctionDescription) obj).getFunctionClass()))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        sb.append(name);
        sb.append("->");
        sb.append(functionClass.getName());
        return sb.toString();
    }
}