com.pietschy.gwt.pectin.client.form.metadata.binding.MetadataBindingBuilder.java Source code

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Here is the source code for com.pietschy.gwt.pectin.client.form.metadata.binding.MetadataBindingBuilder.java

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/*
 * Copyright 2009 Andrew Pietsch 
 *
 * 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.pietschy.gwt.pectin.client.form.metadata.binding;

import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.pietschy.gwt.pectin.client.form.Field;
import com.pietschy.gwt.pectin.client.form.metadata.Metadata;
import com.pietschy.gwt.pectin.client.form.metadata.MetadataPlugin;
import com.pietschy.gwt.pectin.client.value.ValueModel;

import java.util.Collection;

/**
 * Created by IntelliJ IDEA.
 * User: andrew
 * Date: Jul 1, 2009
 * Time: 8:03:21 PM
 * To change this template use File | Settings | File Templates.
 */
public class MetadataBindingBuilder<T> {
    private Collection<Field<?>> fields;
    private Action action;

    public MetadataBindingBuilder(Collection<Field<?>> fields, Action action) {
        this.fields = fields;
        this.action = action;
    }

    public void when(ValueModel<Boolean> condition) {
        condition.addValueChangeHandler(new ValueChangeHandler<Boolean>() {
            public void onValueChange(ValueChangeEvent<Boolean> event) {
                Boolean conditionValue = event.getValue();
                configureMetadata(conditionValue != null ? conditionValue : false);
            }
        });

        Boolean conditionValue = condition.getValue();
        configureMetadata(conditionValue != null ? conditionValue : false);
    }

    private void configureMetadata(Boolean value) {
        for (Field<?> field : fields) {
            action.apply(MetadataPlugin.getMetadata(field), value);
        }
    }

    public interface Action {
        public void apply(Metadata metadata, boolean value);
    }

}