/**
* Copyright (c) 2013-2014, jcabi.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met: 1) Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer. 2) Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution. 3) Neither the name of the jcabi.com nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jcabi.github;
import com.jcabi.aspects.Immutable;
import com.jcabi.aspects.Loggable;
import java.io.IOException;
import javax.json.JsonNumber;
import javax.json.JsonObject;
import javax.json.JsonString;
import javax.json.JsonValue;
import javax.json.JsonValue.ValueType;
import javax.validation.constraints.NotNull;
import lombok.EqualsAndHashCode;
import lombok.ToString;
/**
* Smart JSON (supplementary help class).
*
* @author Yegor Bugayenko (yegor@tpc2.com)
* @version $Id$
* @since 0.5
*/
@Immutable
@ToString
@Loggable(Loggable.DEBUG)
@EqualsAndHashCode(of = "object")
@SuppressWarnings("PMD.AvoidDuplicateLiterals")
final class SmartJson {
/**
* Encapsulated JSON object.
*/
private final transient JsonReadable object;
/**
* Public ctor.
* @param obj Readable object
*/
SmartJson(@NotNull(message = "obj can't be NULL") final JsonReadable obj) {
this.object = obj;
}
/**
* Get its property as string.
* @param name Name of the property
* @return Value
* @throws IOException If there is any I/O problem
*/
@NotNull(message = "text is never NULL")
public String text(
@NotNull(message = "name can't be NULL") final String name
) throws IOException {
return this.value(name, JsonString.class).getString();
}
/**
* Get its property as number.
* @param name Name of the property
* @return Value
* @throws IOException If there is any I/O problem
*/
public int number(
@NotNull(message = "name can't be NULL") final String name
) throws IOException {
return this.value(name, JsonNumber.class).intValue();
}
/**
* Get JSON.
* @return JSON
* @throws IOException If there is any I/O problem
* @since 0.14
*/
@NotNull(message = "JSON is never NULL")
public JsonObject json() throws IOException {
return this.object.json();
}
/**
* Get its property as custom type.
* @param name Name of the property
* @param type Type of result expected
* @return Value
* @throws IOException If there is any I/O problem
* @param <T> Type expected
*/
@NotNull(message = "T is never NULL")
public <T> T value(
@NotNull(message = "name can't be NULL") final String name,
@NotNull(message = "type can't be NULL") final Class<T> type
) throws IOException {
final JsonObject json = this.json();
if (!json.containsKey(name)) {
throw new IllegalStateException(
String.format(
"'%s' is absent in JSON: %s", name, json
)
);
}
final JsonValue value = json.get(name);
if (value == null) {
throw new IllegalStateException(
String.format(
"'%s' is NULL in %s", name, json
)
);
}
if (value.getClass().isAssignableFrom(type)) {
throw new IllegalStateException(
String.format(
"'%s' is not of type %s", name, type
)
);
}
return type.cast(value);
}
/**
* Checks if a certain key is present
* AND its ValueType isn't ValueType.NULL.
* @param name Name of the key which ValueType should be checked.
* @return Returns <code>true</code> if key <code>name</code> is present
* and its ValueType isn't ValueType.NULL, <code>false</code> otherwise.
* @throws IOException If there is any I/O problem
*/
public boolean hasNotNull(
@NotNull(message = "name can't be NULL") final String name
) throws IOException {
final JsonValue value = this.object.json().get(name);
return value != null
&& !ValueType.NULL.equals(value.getValueType());
}
}