RalleYTN / SimpleJSON / 46

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Committed by Ralph Niemitz

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Implemented a solution for issue #5

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/src/main/java/de/ralleytn/simple/json/JSONArray.java

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package de.ralleytn.simple.json;

import java.io.IOException;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Array;
import java.text.DateFormat;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Map;

import de.ralleytn.simple.json.internal.Util;

/**
 * Represents a JSON array.
 * @author FangYidong(fangyidong@yahoo.com.cn)
 * @author Ralph Niemitz/RalleYTN(ralph.niemitz@gmx.de)
 * @version 2.1.0
 * @since 1.0.0
 */
public class JSONArray extends ArrayList<Object> {

        private static final long serialVersionUID = 3957988303675231981L;
        
        /**
         * Constructs an empty {@linkplain JSONArray}.
         * @since 1.0.0
         */
        public JSONArray() {}
        
        /**
         * Constructs a {@linkplain JSONArray} with the elements of the given {@linkplain Collection}.
         * @param collection the {@linkplain Collection}
         * @since 1.0.0
         */
        public JSONArray(Collection<?> collection){
                
                super(collection);
        }
        
        /**
         * Constructs a {@linkplain JSONArray} with the elements of the given array.
         * @param array the array
         * @param <T> the array type
         * @since 1.0.0
         */
        public <T>JSONArray(T[] array) {
                
                for(T element : array) {
                        
                        this.add(element);
                }
        }
        
        /**
         * Constructs a {@linkplain JSONArray} with the elements of the given array.
         * @param array the array
         * @since 1.0.0
         */
        public JSONArray(byte[] array) {
                
                for(byte element : array) {
                        
                        this.add(element);
                }
        }
        
        /**
         * Constructs a {@linkplain JSONArray} with the elements of the given array.
         * @param array the array
         * @since 1.0.0
         */
        public JSONArray(boolean[] array) {
                
                for(boolean element : array) {
                        
                        this.add(element);
                }
        }
        
        /**
         * Constructs a {@linkplain JSONArray} with the elements of the given array.
         * @param array the array
         * @since 1.0.0
         */
        public JSONArray(char[] array) {
                
                for(char element : array) {
                        
                        this.add(element);
                }
        }
        
        /**
         * Constructs a {@linkplain JSONArray} with the elements of the given array.
         * @param array the array
         * @since 1.0.0
         */
        public JSONArray(short[] array) {
                
                for(short element : array) {
                        
                        this.add(element);
                }
        }
        
        /**
         * Constructs a {@linkplain JSONArray} with the elements of the given array.
         * @param array the array
         * @since 1.0.0
         */
        public JSONArray(int[] array) {
                
                for(int element : array) {
                        
                        this.add(element);
                }
        }
        
        /**
         * Constructs a {@linkplain JSONArray} with the elements of the given array.
         * @param array the array
         * @since 1.0.0
         */
        public JSONArray(long[] array) {
                
                for(long element : array) {
                        
                        this.add(element);
                }
        }
        
        /**
         * Constructs a {@linkplain JSONArray} with the elements of the given array.
         * @param array the array
         * @since 1.0.0
         */
        public JSONArray(float[] array) {
                
                for(float element : array) {
                        
                        this.add(element);
                }
        }
        
        /**
         * Constructs a {@linkplain JSONArray} with the elements of the given array.
         * @param array the array
         * @since 1.0.0
         */
        public JSONArray(double[] array) {
                
                for(double element : array) {
                        
                        this.add(element);
                }
        }
        
        /**
         * Constructs a {@linkplain JSONArray} with the elements of the given array.
         * This constructor is a little slower than the others because it uses the Reflection API.
         * @param array the array
         * @since 1.0.0
         */
        public JSONArray(Object array) {

                if(array != null && array.getClass().isArray()) {
                        
                        int length = Array.getLength(array);
                        
                        for(int index = 0; index < length; index++) {
                                
                                this.add(Array.get(array, index));
                        }
                }
        }
        
        /**
         * Constructs a {@linkplain JSONArray} from a JSON string.
         * @param json the JSON string
         * @throws JSONParseException if the JSON is invalid
         * @since 1.0.0
         */
        public JSONArray(String json) throws JSONParseException {
                
                super((JSONArray)new JSONParser().parse(json));
        }
        
        /**
         * Constructs a {@linkplain JSONArray} from a JSON string.
         * @param json the JSON string
         * @param strict {@code true} for strict validation of JSON data; {@code false} if missing colons and commas should be tolerated
         * @throws JSONParseException if the JSON is invalid
         * @since 2.1.0
         */
        public JSONArray(String json, boolean strict) throws JSONParseException {
                
                super((JSONArray)new JSONParser().parse(json, strict));
        }
        
        /**
         * Constructs a {@linkplain JSONArray} from JSON data read from a {@linkplain Reader}.
         * @param reader the {@linkplain Reader}
         * @throws JSONParseException if the JSON is invalid
         * @throws IOException if an I/O error occurred
         * @since 1.0.0
         */
        public JSONArray(Reader reader) throws JSONParseException, IOException {
                
                super((JSONArray)new JSONParser().parse(reader));
        }
        
        /**
         * Constructs a {@linkplain JSONArray} from JSON data read from a {@linkplain Reader}.
         * @param reader the {@linkplain Reader}
         * @param strict {@code true} for strict validation of JSON data; {@code false} if missing colons and commas should be tolerated
         * @throws JSONParseException if the JSON is invalid
         * @throws IOException if an I/O error occurred
         * @since 2.1.0
         */
        public JSONArray(Reader reader, boolean strict) throws JSONParseException, IOException {
                
                super((JSONArray)new JSONParser().parse(reader));
        }
        
        /**
         * Writes this {@linkplain JSONArray} as a JSON string on the given {@linkplain Writer}.
         * @param writer the {@linkplain Writer}
         * @throws IOException if an I/O error occurred
         * @since 1.0.0
         */
        public void write(Writer writer) throws IOException {
                
                Util.write(this, writer);
        }

        /**
         * Converts this {@linkplain JSONArray} to a JSON string.
         * @return this {@linkplain JSONArray} as a JSON string
         * @since 1.0.0
         */
        @Override
        public String toString() {
                
                try(StringWriter writer = new StringWriter()) {
                        
                        Util.write(this, writer);
                        return writer.toString();
                        
                } catch(IOException exception) {

                        // WILL NEVER HAPPEN!
                        // DO NOTHING!
                }
                
                return null;
        }
        
        @Override
        public boolean equals(Object object) {
                
                if(object != null) {
                        
                        if(object instanceof Collection) {
                                
                                Collection<?> collection = (Collection<?>)object;
                                
                                if(collection.size() == this.size()) {
                                        
                                        int index = 0;
                                        
                                        for(Object element : collection) {
                                                
                                                if(!((element == null && this.get(index) == null) || this.get(index).equals(element))) {
                                                        
                                                        return false;
                                                }
                                                
                                                index++;
                                        }
                                        
                                        return true;
                                }
                                
                        } else if(object.getClass().isArray()) {
                                
                                int length = Array.getLength(object);
                                
                                if(length == this.size()) {
                                        
                                        for(int index = 0; index < length; index++) {
                                                
                                                Object element = Array.get(object, index);

                                                if(!((element == null && this.get(index) == null) || this.get(index).equals(element))) {
                                                        
                                                        return false;
                                                }
                                        }
                                        
                                        return true;
                                }
                        }
                }
                
                return false;
        }
        
        /**
         * If the value is a {@linkplain JSONObject} already, it will be casted and returned.
         * If the value is a {@linkplain Map}, it will be wrapped in a {@linkplain JSONObject}. The wrapped {@linkplain JSONObject} will be returned.
         * In any other case this method returns {@code null}.
         * @param index index of the value
         * @return a {@code JSONObject} or {@code null}
         * @since 1.0.0
         */
        public JSONObject getObject(int index) {
                
                return Util.getObject(this.get(index));
        }
        
        /**
         * If the value already is a {@linkplain JSONArray}, it will be casted and returned.
         * If the value is an array or {@linkplain Collection}, it will be wrapped in a {@linkplain JSONArray}.
         * The {@linkplain JSONArray} will be returned.
         * In any other case this method returns {@code null}.
         * @param index index of the value
         * @return a {@linkplain JSONArray} or {@code null}
         * @since 1.0.0
         */
        public JSONArray getArray(int index) {
                
                return Util.getArray(this.get(index));
        }
        
        /**
         * If the value is already a {@linkplain Boolean}, it will be casted and returned.
         * If the value is a {@linkplain String}, it will be parsed. The result is returned.
         * If the value is a {@linkplain Number}, this method will return {@code true} in case its {@code long} value is {@code 1}.
         * It will return {@code false} if it is a number but the {@code long} value is <u>not</u> {@code 1}.
         * In any other case this method returns {@code null}.
         * @param index index of the value
         * @return a {@linkplain Boolean} or {@code null}
         * @since 1.0.0
         */
        public Boolean getBoolean(int index) {
                
                return Util.getBoolean(this.get(index));
        }
        
        /**
         * If the value is a {@linkplain Number}, its {@code byte} value is returned.
         * If the value is a {@linkplain String}, it will be parsed. The result is returned.
         * If the value is a {@linkplain Boolean}, this method returns {@code 1} in case the value is {@code true} otherwise {@code 0}.
         * In any other case this method returns {@code null}.
         * @param index index of the value
         * @return a {@linkplain Byte} or {@code null}
         * @since 1.0.0
         */
        public Byte getByte(int index) {
                
                return Util.getByte(this.get(index));
        }
        
        /**
         * If the value is a {@linkplain Number}, its {@code short} value is returned.
         * If the value is a {@linkplain String}, it will be parsed. The result is returned.
         * If the value is a {@linkplain Boolean}, this method returns {@code 1} in case the value is {@code true} otherwise {@code 0}.
         * In any other case this method returns {@code null}.
         * @param index index of the value
         * @return a {@linkplain Short} or {@code null}
         * @since 1.0.0
         */
        public Short getShort(int index) {
                
                return Util.getShort(this.get(index));
        }
        
        /**
         * If the value is a {@linkplain Number}, its {@code int} value is returned.
         * If the value is a {@linkplain String}, it will be parsed. The result is returned.
         * If the value is a {@linkplain Boolean}, this method returns {@code 1} in case the value is {@code true} otherwise {@code 0}.
         * In any other case this method returns {@code null}.
         * @param index index of the value
         * @return a {@linkplain Integer} or {@code null}
         * @since 1.0.0
         */
        public Integer getInteger(int index) {
                
                return Util.getInteger(this.get(index));
        }
        
        /**
         * If the value is a {@linkplain Number}, its {@code long} value is returned.
         * If the value is a {@linkplain String}, it will be parsed. The result is returned.
         * If the value is a {@linkplain Boolean}, this method returns {@code 1} in case the value is {@code true} otherwise {@code 0}.
         * In any other case this method returns {@code null}.
         * @param index index of the value
         * @return a {@linkplain Long} or {@code null}
         * @since 1.0.0
         */
        public Long getLong(int index) {
                
                return Util.getLong(this.get(index));
        }
        
        /**
         * If the value is a {@linkplain Number}, its {@code float} value is returned.
         * If the value is a {@linkplain String}, it will be parsed. The result is returned.
         * If the value is a {@linkplain Boolean}, this method returns {@code 1} in case the value is {@code true} otherwise {@code 0}.
         * In any other case this method returns {@code null}.
         * @param index index of the value
         * @return a {@linkplain Float} or {@code null}
         * @since 1.0.0
         */
        public Float getFloat(int index) {
                
                return Util.getFloat(this.get(index));
        }
        
        /**
         * If the value is a {@linkplain Number}, its {@code double} value is returned.
         * If the value is a {@linkplain String}, it will be parsed. The result is returned.
         * If the value is a {@linkplain Boolean}, this method returns {@code 1} in case the value is {@code true} otherwise {@code 0}.
         * In any other case this method returns {@code null}.
         * @param index index of the value
         * @return a {@linkplain Double} or {@code null}
         * @since 1.0.0
         */
        public Double getDouble(int index) {
                
                return Util.getDouble(this.get(index));
        }
        
        /**
         * Returns the same as the value's {@link Object#toString()} method.
         * If the actual value is {@code null}, this method will return {@code null}.
         * @param index index of the value
         * @return a {@linkplain String} or {@code null}
         * @since 1.0.0
         */
        public String getString(int index) {
                
                return Util.getString(this.get(index));
        }

        /**
         * If the value already is a {@linkplain Date}, it will be casted and returned.
         * Otherwise the result of the value's {@link Object#toString()} will be parsed by the given
         * {@linkplain DateFormat}. The result is returned.
         * If the actual value is {@code null}, this method will return {@code null}.
         * @param index index of the value
         * @param format the {@linkplain DateFormat} used to parse the date
         * @return a {@linkplain Date} or {@code null}
         * @throws ParseException if the date could not be parsed
         * @since 1.0.0
         */
        public Date getDate(int index, DateFormat format) throws ParseException {
                
                return Util.getDate(this.get(index), format);
        }
        
        /**
         * If the {@linkplain String} representation of the value equals the name of the enum constant
         * in the given enum type, it will return the enum constant.
         * In any other case this method returns {@code null}.
         * @param index index of the value
         * @param type the enum type
         * @param <T> the return type
         * @return an {@linkplain Enum} or {@code null}
         * @since 1.0.0
         */
        public <T extends Enum<T>>T getEnum(int index, Class<T> type) {
                
                return Util.getEnum(this.get(index), type);
        }

        /**
         * Converts this {@linkplain JSONArray} into an array of {@linkplain Boolean}s using the {@link #getBoolean(int)} method.
         * @return an array {@linkplain Boolean}s
         * @since 1.0.0
         */
        public Boolean[] toBooleanArray() {
                
                Boolean[] array = new Boolean[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getBoolean(index);
                }
                
                return array;
        }

        /**
         * Converts this {@linkplain JSONArray} into an array of {@linkplain Byte}s using the {@link #getByte(int)} method.
         * @return an array of {@linkplain Byte}s
         * @since 1.0.0
         */
        public Byte[] toByteArray() {
                
                Byte[] array = new Byte[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getByte(index);
                }
                
                return array;
        }

        /**
         * Converts this {@linkplain JSONArray} into an array of {@linkplain Short}s using the {@link #getShort(int)} method.
         * @return an array of {@linkplain Short}s
         * @since 1.0.0
         */
        public Short[] toShortArray() {
                
                Short[] array = new Short[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getShort(index);
                }
                
                return array;
        }

        /**
         * Converts this {@linkplain JSONArray} into an array of {@linkplain Integer}s using the {@link #getInteger(int)} method.
         * @return an array of {@linkplain Integer}s
         * @since 1.0.0
         */
        public Integer[] toIntegerArray() {
                
                Integer[] array = new Integer[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getInteger(index);
                }
                
                return array;
        }

        /**
         * Converts this {@linkplain JSONArray} into an array of {@linkplain Long}s using the {@link #getLong(int)} method.
         * @return an array of {@linkplain Long}s
         * @since 1.0.0
         */
        public Long[] toLongArray() {
                
                Long[] array = new Long[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getLong(index);
                }
                
                return array;
        }

        /**
         * Converts this {@linkplain JSONArray} into an array of {@linkplain Float}s using the {@link #getFloat(int)} method.
         * @return an array of {@linkplain Float}s
         * @since 1.0.0
         */
        public Float[] toFloatArray() {
                
                Float[] array = new Float[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getFloat(index);
                }
                
                return array;
        }
        
        /**
         * Converts this {@linkplain JSONArray} into an array of {@linkplain Double}s using the {@link #getDouble(int)} method.
         * @return an array of {@linkplain Double}s
         * @since 1.0.0
         */
        public Double[] toDoubleArray() {
                
                Double[] array = new Double[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getDouble(index);
                }
                
                return array;
        }
        
        /**
         * Converts this {@linkplain JSONArray} into an array of {@linkplain String}s using the {@link #getString(int)} method.
         * @return an array of {@linkplain String}s
         * @since 1.0.0
         */
        public String[] toStringArray() {
                
                String[] array = new String[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getString(index);
                }
                
                return array;
        }
        
        /**
         * Converts this {@linkplain JSONArray} into an array of {@linkplain JSONObject}s using the {@link #getObject(int)} method.
         * @return an array of {@linkplain JSONObject}s
         * @since 1.0.0
         */
        public JSONObject[] toObjectArray() {
                
                JSONObject[] array = new JSONObject[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getObject(index);
                }
                
                return array;
        }
        
        /**
         * Converts this {@linkplain JSONArray} into an array of {@linkplain JSONArray}s using the {@link #getArray(int)} method.
         * @return an array of {@linkplain JSONArray}s.
         * @since 1.0.0
         */
        public JSONArray[] toArrayArray() {
                
                JSONArray[] array = new JSONArray[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getArray(index);
                }
                
                return array;
        }
        
        /**
         * Converts this {@linkplain JSONArray} to a primitive {@code byte} array.
         * @return a primitive {@code byte} array
         * @since 2.0.0
         */
        public byte[] toPrimitiveByteArray() {
                
                byte[] array = new byte[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getByte(index);
                }
                
                return array;
        }
        
        /**
         * Converts this {@linkplain JSONArray} to a primitive {@code short} array.
         * @return a primitive {@code short} array
         * @since 2.0.0
         */
        public short[] toPrimitiveShortArray() {
                
                short[] array = new short[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getShort(index);
                }
                
                return array;
        }
        
        /**
         * Converts this {@linkplain JSONArray} to a primitive {@code int} array.
         * @return a primitive {@code int} array
         * @since 2.0.0
         */
        public int[] toPrimitiveIntArray() {
                
                int[] array = new int[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getInteger(index);
                }
                
                return array;
        }
        
        /**
         * Converts this {@linkplain JSONArray} to a primitive {@code long} array.
         * @return a primitive {@code long} array
         * @since 2.0.0
         */
        public long[] toPrimitiveLongArray() {
                
                long[] array = new long[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getLong(index);
                }
                
                return array;
        }
        
        /**
         * Converts this {@linkplain JSONArray} to a primitive {@code float} array.
         * @return a primitive {@code float} array
         * @since 2.0.0
         */
        public float[] toPrimitiveFloatArray() {
                
                float[] array = new float[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getFloat(index);
                }
                
                return array;
        }
        
        /**
         * Converts this {@linkplain JSONArray} to a primitive {@code double} array.
         * @return a primitive {@code double} array
         * @since 2.0.0
         */
        public double[] toPrimitiveDoubleArray() {
                
                double[] array = new double[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getDouble(index);
                }
                
                return array;
        }
        
        /**
         * Converts this {@linkplain JSONArray} to a primitive {@code boolean} array.
         * @return a primitive {@code boolean} array
         * @since 2.0.0
         */
        public boolean[] toPrimitiveBooleanArray() {
                
                boolean[] array = new boolean[this.size()];
                
                for(int index = 0; index < array.length; index++) {
                        
                        array[index] = this.getBoolean(index);
                }
                
                return array;
        }
        
        /**
         * Converts this {@linkplain JSONArray} to a XML string.
         * @param rootName name of the root element
         * @return this JSON array as a XML string
         * @since 1.1.0
         */
        public String toXML(String rootName) {
                
                StringBuilder builder = new StringBuilder();
                builder.append('<');
                builder.append(rootName);
                builder.append(" length=");
                builder.append(this.size());
                builder.append('>');
                
                for(Object element : this) {

                                   if(element instanceof JSONObject) {builder.append(((JSONObject)element).toXML("item"));
                        } else if(element instanceof JSONArray) {builder.append(((JSONArray)element).toXML("item"));
                        } else {
                                        
                                builder.append("<item>");
                                
                                if(element != null) {
                                        
                                        builder.append(String.valueOf(element));
                                }
                                
                                builder.append("</item>");
                        }
                }
                
                builder.append("</");
                builder.append(rootName);
                builder.append('>');
                
                return builder.toString();
        }
}

RalleYTN / SimpleJSON / 46

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