PojoMetadata.java

/*
 * Copyright (c) 2012-2014 Savoir Technologies, Inc.
 *
 * 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.savoirtech.hecate.cql3.meta;


import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import com.savoirtech.hecate.cql3.ReflectionUtils;
import com.savoirtech.hecate.cql3.exception.HecateException;
import com.savoirtech.hecate.cql3.util.HecateUtils;
import org.apache.commons.lang3.Validate;

public class PojoMetadata {
//----------------------------------------------------------------------------------------------------------------------
// Fields
//----------------------------------------------------------------------------------------------------------------------

    private final Class<?> pojoType;
    private final String defaultTableName;
    private final int timeToLive;
    private final Map<String, FacetMetadata> facets = new HashMap<>();
    private FacetMetadata identifierFacet;

//----------------------------------------------------------------------------------------------------------------------
// Constructors
//----------------------------------------------------------------------------------------------------------------------

    public PojoMetadata(Class<?> pojoType) {
        this.pojoType = Validate.notNull(pojoType, "POJO type cannot be null.");
        Validate.isTrue(ReflectionUtils.isInstantiable(pojoType), "Unable to instantiate POJOs of type %s", pojoType.getName());
        this.defaultTableName = HecateUtils.tableName(pojoType);
        this.timeToLive = HecateUtils.ttl(pojoType);
    }

//----------------------------------------------------------------------------------------------------------------------
// Getter/Setter Methods
//----------------------------------------------------------------------------------------------------------------------

    public String getDefaultTableName() {
        return defaultTableName;
    }

    public int getTimeToLive() {
        return timeToLive;
    }

    public FacetMetadata getIdentifierFacet() {
        return identifierFacet;
    }

    public Class<?> getPojoType() {
        return pojoType;
    }

//----------------------------------------------------------------------------------------------------------------------
// Canonical Methods
//----------------------------------------------------------------------------------------------------------------------

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

        PojoMetadata that = (PojoMetadata) o;

        if (!pojoType.equals(that.pojoType)) {
            return false;
        }

        return true;
    }

    @Override
    public int hashCode() {
        return pojoType.hashCode();
    }

//----------------------------------------------------------------------------------------------------------------------
// Other Methods
//----------------------------------------------------------------------------------------------------------------------

    public void addFacet(FacetMetadata facetMetadata) {
        final String facetName = facetMetadata.getFacet().getName();
        if (facets.containsKey(facetName)) {
            throw new HecateException(String.format("Duplicate facets found (%s).", facetName));
        }
        facets.put(facetName, facetMetadata);
        if (facetMetadata.isIdentifier()) {
            if (identifierFacet != null) {
                throw new HecateException(String.format("Duplicate identifiers found %s and %s.", facetName, identifierFacet.getFacet().getName()));
            }
            identifierFacet = facetMetadata;
        }
    }

    /**
     * Returns a mapping from the facet's name to the facet.
     *
     * @return a mapping from the facet's name to the facet
     */
    public Map<String, FacetMetadata> getFacets() {
        return Collections.unmodifiableMap(facets);
    }

    public Object newPojo(Object identifier) {
        Object pojo = ReflectionUtils.instantiate(pojoType);
        getIdentifierFacet().getFacet().set(pojo, identifier);
        return pojo;
    }
}