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/*******************************************************************************
 * Copyright 2012 Anteros Tecnologia
 *  
 * 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 br.com.anteros.bean.validation;

import br.com.anteros.bean.validation.model.MetaBean;
import br.com.anteros.bean.validation.model.MetaProperty;
import static br.com.anteros.bean.validation.model.Features.Property.*;

/**
 * Description: Default implementation for the interface to find, register and
 * create MetaBeans. In most situations a single instance of this class is
 * sufficient and you can get this instance from the
 * {@link MetaBeanManagerFactory}. 

 */
public class MetaBeanManager implements MetaBeanFinder {

    /** MetaBean cache */
    protected final MetaBeanCache cache = new MetaBeanCache();
    /** MetaBean builder */
    protected final MetaBeanBuilder builder;
    /** Complete flag */
    protected boolean complete = false;

    /**
     * Create a new MetaBeanManager instance.
     */
    public MetaBeanManager() {
        builder = new MetaBeanBuilder();
    }

    /**
     * Create a new MetaBeanManager instance.
     * 
     * @param builder
     */
    public MetaBeanManager(MetaBeanBuilder builder) {
        this.builder = builder;
    }

    /**
     * Get the builder used.
     * 
     * @return {@link MetaBeanBuilder}
     */
    public MetaBeanBuilder getBuilder() {
        return builder;
    }

    /**
     * Get the cache used.
     * 
     * @return {@link MetaBeanCache}
     */
    public MetaBeanCache getCache() {
        return cache;
    }

    /**
     * {@inheritDoc}
     */
    public MetaBean findForId(String beanInfoId) {
        MetaBean beanInfo = cache.findForId(beanInfoId);
        if (beanInfo != null)
            return beanInfo;
        try {
            beanInfo = builder.buildForId(beanInfoId);
            cache.cache(beanInfo);
            computeRelationships(beanInfo);
            return beanInfo;
        } catch (RuntimeException e) {
            throw e; // do not wrap runtime exceptions
        } catch (Exception e) {
            throw new IllegalArgumentException("error creating beanInfo with id: " + beanInfoId, e);
        }
    }

    /**
     * {@inheritDoc}
     */
    public MetaBean findForClass(Class clazz) {
        if (clazz == null)
            return null;
        MetaBean beanInfo = cache.findForClass(clazz);
        if (beanInfo != null)
            return beanInfo;
        try {
            beanInfo = builder.buildForClass(clazz);
            cache.cache(beanInfo);
            computeRelationships(beanInfo);
            return beanInfo;
        } catch (RuntimeException e) {
            throw e; // do not wrap runtime exceptions
        } catch (Exception e) {
            throw new IllegalArgumentException("error creating beanInfo for " + clazz, e);
        }
    }

    /**
     * Compute all known relationships for beanInfo. must be called
     * AFTER cache.cache() to avoid endless loop
     * 
     * @param beanInfo
     *            - the bean for which to compute relationships
     */
    protected void computeRelationships(MetaBean beanInfo) {
        for (MetaProperty prop : beanInfo.getProperties()) {
            String beanRef = (String) prop.getFeature(REF_BEAN_ID);
            computeRelatedMetaBean(prop, beanRef);
        }
    }

    /**
     * Compute a single related {@link MetaBean}.
     * 
     * @param prop
     * @param beanRef
     */
    protected void computeRelatedMetaBean(MetaProperty prop, String beanRef) {
        Class beanType = prop.getFeature(REF_BEAN_TYPE);
        if (beanType != null) {
            prop.setMetaBean(findForClass(beanType));
        } else if (prop.getFeature(REF_CASCADE) != null) { // dynamic type
                                                           // resolution:
            prop.setMetaBean(new DynamicMetaBean(this));
        }
    }

}