com.feilong.lib.ezmorph.array.ObjectArrayMorpher Maven / Gradle / Ivy

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/*
 * Copyright (C) 2008 feilong
 *
 * 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.feilong.lib.ezmorph.array;

import java.lang.reflect.Array;
import java.lang.reflect.Method;

import com.feilong.lib.ezmorph.MorphException;
import com.feilong.lib.ezmorph.Morpher;

/**
 * Morphs an array to another array using a Morpher.
 *
 * @author Andres Almiray
 */
public final class ObjectArrayMorpher extends AbstractArrayMorpher{

    /** The morpher. */
    private Morpher  morpher;

    /** The morph method. */
    private Method   morphMethod;

    /** The target. */
    private Class target;

    /** The target array class. */
    private Class targetArrayClass;

    //---------------------------------------------------------------

    /**
     * Creates a new ArrayMorpher which will use another Morpher for its inner
     * type.

     * The inner morpher can not morph to an array. Multiple dimension arrays are
     * already handled by this class.
     *
     * @param morpher
     *            the Morpher that will handle the array's inner type.
     */
    public ObjectArrayMorpher(Morpher morpher){
        super(false);
        setMorpher(morpher);
    }

    /**
     * Morph.
     *
     * @param array
     *            the array
     * @return the object
     */
    @Override
    public Object morph(Object array){
        if (array == null){
            return null;
        }

        if (array.getClass().isArray()){
            int length = Array.getLength(array);
            int dims = getDimensions(array.getClass());
            int[] dimensions = createDimensions(dims, length);
            Object result = Array.newInstance(this.target, dimensions);

            if (dims == 1){
                for (int index = 0; index < length; index++){
                    try{
                        Object value = Array.get(array, index);
                        if (value != null && !morpher.supports(value.getClass())){
                            throw new MorphException(value.getClass() + " is not supported");
                        }
                        Object morphed = morphMethod.invoke(morpher, new Object[] { value });
                        Array.set(result, index, morphed);
                    }catch (MorphException me){
                        throw me;
                    }catch (Exception e){
                        throw new MorphException(e);
                    }
                }
            }else{
                for (int index = 0; index < length; index++){
                    Array.set(result, index, morph(Array.get(array, index)));
                }
            }

            return result;
        }
        throw new MorphException("argument is not an array: " + array.getClass());
    }

    /**
     * Morphs to.
     *
     * @return the class
     */
    @Override
    public Class morphsTo(){
        return targetArrayClass;
    }

    /**
     * Supports.
     *
     * @param clazz
     *            the clazz
     * @return true, if successful
     */
    @Override
    public boolean supports(Class clazz){
        if (clazz == null){
            return false;
        }
        if (!clazz.isArray()){
            return false;
        }

        //---------------------------------------------------------------
        while (clazz.isArray()){
            clazz = clazz.getComponentType();
        }
        return morpher.supports(clazz);
    }

    /**
     * Sets the morpher.
     *
     * @param morpher
     *            the new morpher
     */
    private void setMorpher(Morpher morpher){
        if (morpher == null){
            throw new IllegalArgumentException("morpher can not be null");
        }
        if (morpher.morphsTo().isArray()){
            throw new IllegalArgumentException("morpher target class can not be an array");
        }
        this.morpher = morpher;
        this.targetArrayClass = Array.newInstance(morpher.morphsTo(), 1).getClass();
        this.target = morpher.morphsTo();

        // cache the morph method
        try{
            morphMethod = morpher.getClass().getDeclaredMethod("morph", new Class[] { Object.class });
        }catch (NoSuchMethodException nsme){
            throw new IllegalArgumentException(nsme.getMessage());
        }
    }
}