javax.json.JsonArray Maven / Gradle / Ivy
Show all versions of javax.json-api Show documentation
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2011-2013 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.json;
import java.util.List;
/**
* {@code JsonArray} represents an immutable JSON array
* (an ordered sequence of zero or more values).
* It also provides an unmodifiable list view of the values in the array.
*
* A {@code JsonArray} object can be created by reading JSON data from
* an input source or it can be built from scratch using an array builder
* object.
*
*
The following example demonstrates how to create a {@code JsonArray}
* object from an input source using the method {@link JsonReader#readArray()}:
*
* JsonReader jsonReader = Json.createReader(...);
* JsonArray array = jsonReader.readArray();
* jsonReader.close();
*
*
* The following example demonstrates how to build an empty JSON array
* using the class {@link JsonArrayBuilder}:
*
* JsonArray array = Json.createArrayBuilder().build();
*
*
* The example code below demonstrates how to create the following JSON array:
*
* [
* { "type": "home", "number": "212 555-1234" },
* { "type": "fax", "number": "646 555-4567" }
* ]
*
*
* JsonArray value = Json.createArrayBuilder()
* .add(Json.createObjectBuilder()
* .add("type", "home")
* .add("number", "212 555-1234"))
* .add(Json.createObjectBuilder()
* .add("type", "fax")
* .add("number", "646 555-4567"))
* .build();
*
*
* The following example demonstrates how to write a {@code JsonArray} object
* as JSON data:
*
* JsonArray arr = ...;
* JsonWriter writer = Json.createWriter(...)
* writer.writeArray(arr);
* writer.close();
*
*
* The values in a {@code JsonArray} can be of the following types:
* {@link JsonObject}, {@link JsonArray},
* {@link JsonString}, {@link JsonNumber}, {@link JsonValue#TRUE},
* {@link JsonValue#FALSE}, and {@link JsonValue#NULL}.
* {@code JsonArray} provides various accessor methods to access the values
* in an array.
*
*
The following example shows how to obtain the home phone number
* "212 555-1234" from the array built in the previous example:
*
* JsonObject home = array.getValue(0, JsonObject.class);
* String number = home.getStringValue("number");
*
*
* {@code JsonArray} instances are list objects that provide read-only
* access to the values in the JSON array. Any attempt to modify the list,
* whether directly or using its collection views, results in an
* {@code UnsupportedOperationException}.
*
* @author Jitendra Kotamraju
*/
public interface JsonArray extends JsonStructure, List {
/**
* Returns the value of the array at the specified position.
* This is a convenience method for {@code (T)get(index)}.
*
* @param index index of the value to return
* @param clazz value class
* @return the value of the array at the specified position
* @throws IndexOutOfBoundsException if the index is out of range
* @throws ClassCastException if the value at the specified position is not
* assignable to the type T
*/
T getValue(int index, Class clazz);
/**
* A convenience method for
* {@code getValue(index, JsonString.class).getStringValue()}.
*
* @param index index of the {@code JsonString} value
* @return the String value at the specified position
* @throws IndexOutOfBoundsException if the index is out of range
* @throws ClassCastException if the value at the specified position is not
* assignable to {@code JsonString}
*/
String getStringValue(int index);
/**
* Returns the {@code String} value of {@code JsonString} at the specified
* position in this JSON array values. If {@code JsonString} is found,
* its {@link javax.json.JsonString#getStringValue()} is returned. Otherwise,
* the specified default value is returned.
*
* @param index index of the JsonString value
* @return the String value at the specified position in this array,
* or the specified default value
*/
String getStringValue(int index, String defaultValue);
/**
* A convenience method for
* {@code getValue(index, JsonNumber.class).getIntValue()}.
*
* @param index index of the {@code JsonNumber} value
* @return the int value at the specified position
* @throws IndexOutOfBoundsException if the index is out of range
* @throws ClassCastException if the value at the specified position is not
* assignable to {@code JsonNumber}
*/
int getIntValue(int index);
/**
* Returns the int value of the {@code JsonNumber} at the specified position.
* If the value at that position is a {@code JsonNumber},
* this method returns {@link javax.json.JsonNumber#getIntValue()}. Otherwise
* this method returns the specified default value.
*
* @param index index of the {@code JsonNumber} value
* @return the int value at the specified position in this array,
* or the specified default value
*/
int getIntValue(int index, int defaultValue);
/**
* Returns the boolean value at the specified position.
* If the value at the specified position is {@code JsonValue.TRUE}
* this method returns {@code true}. If the value at the specified position
* is {@code JsonValue.FALSE} this method returns {@code false}.
*
* @param index index of the JSON boolean value
* @return the boolean value at the specified position
* @throws IndexOutOfBoundsException if the index is out of range
* @throws ClassCastException if the value at the specified position is not
* assignable to {@code JsonValue.TRUE} or {@code JsonValue.FALSE}
*/
boolean getBooleanValue(int index);
/**
* Returns the boolean value at the specified position.
* If the value at the specified position is {@code JsonValue.TRUE}
* this method returns {@code true}. If the value at the specified position
* is {@code JsonValue.FALSE} this method returns {@code false}.
* Otherwise this method returns the specified default value.
*
* @param index index of the JSON boolean value
* @return the boolean value at the specified position,
* or the specified default value
*/
boolean getBooleanValue(int index, boolean defaultValue);
}