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/*
* Copyright 2015-2017 UnboundID Corp.
* All Rights Reserved.
*/
/*
* Copyright (C) 2015-2017 UnboundID Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPLv2 only)
* or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
package com.unboundid.util.json;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import com.unboundid.util.NotMutable;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;
/**
* This class provides an implementation of a JSON value that represents an
* ordered collection of zero or more values. An array can contain elements of
* any type, including a mix of types, and including nested arrays. The same
* value may appear multiple times in an array.
*
* The string representation of a JSON array is an open square bracket (U+005B)
* followed by a comma-delimited list of the string representations of the
* values in that array and a closing square bracket (U+005D). There must not
* be a comma between the last item in the array and the closing square bracket.
* There may optionally be any amount of whitespace (where whitespace characters
* include the ASCII space, horizontal tab, line feed, and carriage return
* characters) after the open square bracket, on either or both sides of commas
* separating values, and before the close square bracket.
*
* The string representation returned by the {@link #toString()} method (or
* appended to the buffer provided to the {@link #toString(StringBuilder)}
* method) will include one space before each value in the array and one space
* before the closing square bracket. There will not be any space between a
* value and the comma that follows it. The string representation of each value
* in the array will be obtained using that value's {@code toString} method.
*
* The normalized string representation will not include any optional spaces,
* and the normalized string representation of each value in the array will be
* obtained using that value's {@code toNormalizedString} method.
*/
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class JSONArray
extends JSONValue
{
/**
* A pre-allocated empty JSON array.
*/
public static final JSONArray EMPTY_ARRAY = new JSONArray();
/**
* The serial version UID for this serializable class.
*/
private static final long serialVersionUID = -5493008945333225318L;
// The hash code for this JSON array.
private Integer hashCode;
// The list of values for this array.
private final List values;
// The string representation for this JSON array.
private String stringRepresentation;
/**
* Creates a new JSON array with the provided values.
*
* @param values The set of values to include in this JSON array. It may be
* {@code null} or empty to indicate that the array should be
* empty.
*/
public JSONArray(final JSONValue... values)
{
this((values == null) ? null : Arrays.asList(values));
}
/**
* Creates a new JSON array with the provided values.
*
* @param values The set of values to include in this JSON array. It may be
* {@code null} or empty to indicate that the array should be
* empty.
*/
public JSONArray(final List values)
{
if (values == null)
{
this.values = Collections.emptyList();
}
else
{
this.values =
Collections.unmodifiableList(new ArrayList(values));
}
hashCode = null;
stringRepresentation = null;
}
/**
* Retrieves the set of values contained in this JSON array.
*
* @return The set of values contained in this JSON array.
*/
public List getValues()
{
return values;
}
/**
* Indicates whether this array is empty.
*
* @return {@code true} if this array does not contain any values, or
* {@code false} if this array contains at least one value.
*/
public boolean isEmpty()
{
return values.isEmpty();
}
/**
* Retrieves the number of values contained in this array.
*
* @return The number of values contained in this array.
*/
public int size()
{
return values.size();
}
/**
* {@inheritDoc}
*/
@Override()
public int hashCode()
{
if (hashCode == null)
{
int hc = 0;
for (final JSONValue v : values)
{
hc = (hc * 31) + v.hashCode();
}
hashCode = hc;
}
return hashCode;
}
/**
* {@inheritDoc}
*/
@Override()
public boolean equals(final Object o)
{
if (o == this)
{
return true;
}
if (o instanceof JSONArray)
{
final JSONArray a = (JSONArray) o;
return values.equals(a.values);
}
return false;
}
/**
* Indicates whether this JSON array is considered equivalent to the provided
* array, subject to the specified constraints.
*
* @param array The array for which to make the determination.
* @param ignoreFieldNameCase Indicates whether to ignore differences in
* capitalization in field names for any JSON
* objects contained in the array.
* @param ignoreValueCase Indicates whether to ignore differences in
* capitalization for array elements that are
* JSON strings, as well as for the string values
* of any JSON objects and arrays contained in
* the array.
* @param ignoreArrayOrder Indicates whether to ignore differences in the
* order of elements contained in the array.
*
* @return {@code true} if this JSON array is considered equivalent to the
* provided array (subject to the specified constraints), or
* {@code false} if not.
*/
public boolean equals(final JSONArray array,
final boolean ignoreFieldNameCase,
final boolean ignoreValueCase,
final boolean ignoreArrayOrder)
{
// See if we can do a straight-up List.equals. If so, just do that.
if ((! ignoreFieldNameCase) && (! ignoreValueCase) && (! ignoreArrayOrder))
{
return values.equals(array.values);
}
// Make sure the arrays have the same number of elements.
if (values.size() != array.values.size())
{
return false;
}
// Optimize for the case in which the order of values is significant.
if (! ignoreArrayOrder)
{
final Iterator thisIterator = values.iterator();
final Iterator thatIterator = array.values.iterator();
while (thisIterator.hasNext())
{
final JSONValue thisValue = thisIterator.next();
final JSONValue thatValue = thatIterator.next();
if (! thisValue.equals(thatValue, ignoreFieldNameCase, ignoreValueCase,
ignoreArrayOrder))
{
return false;
}
}
return true;
}
// If we've gotten here, then we know that we don't care about the order.
// Create a new list that we can remove values from as we find matches.
// This is important because arrays can have duplicate values, and we don't
// want to keep matching the same element.
final ArrayList thatValues =
new ArrayList(array.values);
final Iterator thisIterator = values.iterator();
while (thisIterator.hasNext())
{
final JSONValue thisValue = thisIterator.next();
boolean found = false;
final Iterator thatIterator = thatValues.iterator();
while (thatIterator.hasNext())
{
final JSONValue thatValue = thatIterator.next();
if (thisValue.equals(thatValue, ignoreFieldNameCase, ignoreValueCase,
ignoreArrayOrder))
{
found = true;
thatIterator.remove();
break;
}
}
if (! found)
{
return false;
}
}
return true;
}
/**
* {@inheritDoc}
*/
@Override()
public boolean equals(final JSONValue v, final boolean ignoreFieldNameCase,
final boolean ignoreValueCase,
final boolean ignoreArrayOrder)
{
return ((v instanceof JSONArray) &&
equals((JSONArray) v, ignoreFieldNameCase, ignoreValueCase,
ignoreArrayOrder));
}
/**
* Indicates whether this JSON array contains an element with the specified
* value.
*
* @param value The value for which to make the determination.
* @param ignoreFieldNameCase Indicates whether to ignore differences in
* capitalization in field names for any JSON
* objects contained in the array.
* @param ignoreValueCase Indicates whether to ignore differences in
* capitalization for array elements that are
* JSON strings, as well as for the string values
* of any JSON objects and arrays contained in
* the array.
* @param ignoreArrayOrder Indicates whether to ignore differences in the
* order of elements contained in arrays. This
* is only applicable if the provided value is
* itself an array or is a JSON object that
* contains values that are arrays.
* @param recursive Indicates whether to recursively look into any
* arrays contained inside this array.
*
* @return {@code true} if this JSON array contains an element with the
* specified value, or {@code false} if not.
*/
public boolean contains(final JSONValue value,
final boolean ignoreFieldNameCase,
final boolean ignoreValueCase,
final boolean ignoreArrayOrder,
final boolean recursive)
{
for (final JSONValue v : values)
{
if (v.equals(value, ignoreFieldNameCase, ignoreValueCase,
ignoreArrayOrder))
{
return true;
}
if (recursive && (v instanceof JSONArray) &&
((JSONArray) v).contains(value, ignoreFieldNameCase, ignoreValueCase,
ignoreArrayOrder, recursive))
{
return true;
}
}
return false;
}
/**
* Retrieves a string representation of this array as it should appear in a
* JSON object, including the surrounding square brackets. Appropriate
* encoding will also be used for all elements in the array. If the object
* containing this array was decoded from a string, then this method will use
* the same string representation as in that original object. Otherwise, the
* string representation will be constructed.
*
* @return A string representation of this array as it should appear in a
* JSON object, including the surrounding square brackets.
*/
@Override()
public String toString()
{
if (stringRepresentation == null)
{
final StringBuilder buffer = new StringBuilder();
toString(buffer);
stringRepresentation = buffer.toString();
}
return stringRepresentation;
}
/**
* Appends a string representation of this value as it should appear in a
* JSON object, including the surrounding square brackets,. to the provided
* buffer. Appropriate encoding will also be used for all elements in the
* array. If the object containing this array was decoded from a string,
* then this method will use the same string representation as in that
* original object. Otherwise, the string representation will be constructed.
*
* @param buffer The buffer to which the information should be appended.
*/
@Override()
public void toString(final StringBuilder buffer)
{
if (stringRepresentation != null)
{
buffer.append(stringRepresentation);
return;
}
buffer.append("[ ");
final Iterator iterator = values.iterator();
while (iterator.hasNext())
{
iterator.next().toString(buffer);
if (iterator.hasNext())
{
buffer.append(',');
}
buffer.append(' ');
}
buffer.append(']');
}
/**
* Retrieves a single-line string representation of this array as it should
* appear in a JSON object, including the surrounding square brackets.
* Appropriate encoding will also be used for all elements in the array.
*
* @return A string representation of this array as it should appear in a
* JSON object, including the surrounding square brackets.
*/
@Override()
public String toSingleLineString()
{
final StringBuilder buffer = new StringBuilder();
toSingleLineString(buffer);
return buffer.toString();
}
/**
* Appends a single-line string representation of this array as it should
* appear in a JSON object, including the surrounding square brackets, to the
* provided buffer. Appropriate encoding will also be used for all elements
* in the array.
*
* @param buffer The buffer to which the information should be appended.
*/
@Override()
public void toSingleLineString(final StringBuilder buffer)
{
buffer.append("[ ");
final Iterator iterator = values.iterator();
while (iterator.hasNext())
{
iterator.next().toSingleLineString(buffer);
if (iterator.hasNext())
{
buffer.append(',');
}
buffer.append(' ');
}
buffer.append(']');
}
/**
* Retrieves a normalized string representation of this array. The normalized
* representation will not contain any line breaks, will not include any
* spaces around the enclosing brackets or around commas used to separate the
* elements, and it will use the normalized representations of those elements.
* The order of elements in an array is considered significant, and will not
* be affected by the normalization process.
*
* @return A normalized string representation of this array.
*/
@Override()
public String toNormalizedString()
{
final StringBuilder buffer = new StringBuilder();
toNormalizedString(buffer);
return buffer.toString();
}
/**
* Appends a normalized string representation of this array to the provided
* buffer. The normalized representation will not contain any line breaks,
* will not include any spaces around the enclosing brackets or around commas
* used to separate the elements, and it will use the normalized
* representations of those elements. The order of elements in an array is
* considered significant, and will not be affected by the normalization
* process.
*
* @param buffer The buffer to which the information should be appended.
*/
@Override()
public void toNormalizedString(final StringBuilder buffer)
{
buffer.append('[');
final Iterator iterator = values.iterator();
while (iterator.hasNext())
{
iterator.next().toNormalizedString(buffer);
if (iterator.hasNext())
{
buffer.append(',');
}
}
buffer.append(']');
}
/**
* {@inheritDoc}
*/
@Override()
public void appendToJSONBuffer(final JSONBuffer buffer)
{
buffer.beginArray();
for (final JSONValue value : values)
{
value.appendToJSONBuffer(buffer);
}
buffer.endArray();
}
/**
* {@inheritDoc}
*/
@Override()
public void appendToJSONBuffer(final String fieldName,
final JSONBuffer buffer)
{
buffer.beginArray(fieldName);
for (final JSONValue value : values)
{
value.appendToJSONBuffer(buffer);
}
buffer.endArray();
}
}
