com.subakva.formicid.options.ParameterHandler.java Source code

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Here is the source code for com.subakva.formicid.options.ParameterHandler.java

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/*
 * Copyright 2007 Jason Wadsworth
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.subakva.formicid.options;

import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.HashSet;

import com.subakva.formicid.Container;

import org.apache.commons.beanutils.Converter;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;

public class ParameterHandler implements OptionHandler {

    private static HashSet<String> excluded = new HashSet<String>();
    private final Container container;

    static {
        PropertyDescriptor[] taskProps = PropertyUtils.getPropertyDescriptors(Task.class);
        for (PropertyDescriptor descriptor : taskProps) {
            if (descriptor.getWriteMethod() != null) {
                ParameterHandler.excluded.add(descriptor.getName());
            }
        }
    }

    public ParameterHandler(Container container) {
        this.container = container;
    }

    public void handleOption(Task task, String optionName, Object value) {
        HashMap<String, PropertyDescriptor> properties = getWritableProperties(task.getClass());
        PropertyDescriptor descriptor = properties.get(optionName.toLowerCase());
        if (descriptor == null) {
            throw new RuntimeException("Unknown property for " + task.getTaskType() + " task: " + optionName);
        }
        Class<?> type = descriptor.getPropertyType();
        Converter converter = container.getConverter(type);
        Object converted = converter.convert(type, value);
        try {
            task.log("converting property: " + descriptor.getName(), Project.MSG_DEBUG);
            task.log("converter: " + converter, Project.MSG_DEBUG);
            task.log("converted: " + converted, Project.MSG_DEBUG);

            descriptor.getWriteMethod().invoke(task, new Object[] { converted });
        } catch (IllegalArgumentException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e);
        }
    }

    protected HashMap<String, PropertyDescriptor> getWritableProperties(Class taskClass) {
        HashMap<String, PropertyDescriptor> writableProperties = new HashMap<String, PropertyDescriptor>();
        PropertyDescriptor[] descriptors = PropertyUtils.getPropertyDescriptors(taskClass);
        for (PropertyDescriptor descriptor : descriptors) {
            if (descriptor.getWriteMethod() != null && !excluded.contains(descriptor.getName())) {
                writableProperties.put(descriptor.getName().toLowerCase(), descriptor);
            }
        }
        return writableProperties;
    }
}