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/*
 * Licensed to ElasticSearch and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. ElasticSearch licenses this
 * file to you 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 org.elasticsearch.common.xcontent;

import org.apache.lucene.util.BytesRef;

import java.io.Closeable;
import java.io.IOException;
import java.util.Map;

/**
 *
 */
public interface XContentParser extends Closeable {

    enum Token {
        START_OBJECT {
            @Override
            public boolean isValue() {
                return false;
            }
        },

        END_OBJECT {
            @Override
            public boolean isValue() {
                return false;
            }
        },

        START_ARRAY {
            @Override
            public boolean isValue() {
                return false;
            }
        },

        END_ARRAY {
            @Override
            public boolean isValue() {
                return false;
            }
        },

        FIELD_NAME {
            @Override
            public boolean isValue() {
                return false;
            }
        },

        VALUE_STRING {
            @Override
            public boolean isValue() {
                return true;
            }
        },

        VALUE_NUMBER {
            @Override
            public boolean isValue() {
                return true;
            }
        },

        VALUE_BOOLEAN {
            @Override
            public boolean isValue() {
                return true;
            }
        },

        // usually a binary value
        VALUE_EMBEDDED_OBJECT {
            @Override
            public boolean isValue() {
                return true;
            }
        },

        VALUE_NULL {
            @Override
            public boolean isValue() {
                return false;
            }
        };

        public abstract boolean isValue();
    }

    enum NumberType {
        INT, LONG, FLOAT, DOUBLE
    }

    XContentType contentType();

    Token nextToken() throws IOException;

    void skipChildren() throws IOException;

    Token currentToken();

    String currentName() throws IOException;

    Map map() throws IOException;

    Map mapOrdered() throws IOException;

    Map mapAndClose() throws IOException;

    Map mapOrderedAndClose() throws IOException;

    String text() throws IOException;

    String textOrNull() throws IOException;

    BytesRef bytesOrNull() throws IOException;

    BytesRef bytes() throws IOException;

    Object objectText() throws IOException;

    Object objectBytes() throws IOException;

    boolean hasTextCharacters();

    char[] textCharacters() throws IOException;

    int textLength() throws IOException;

    int textOffset() throws IOException;

    Number numberValue() throws IOException;

    NumberType numberType() throws IOException;

    /**
     * Is the number type estimated or not (i.e. an int might actually be a long, its just low enough
     * to be an int).
     */
    boolean estimatedNumberType();

    short shortValue() throws IOException;

    int intValue() throws IOException;

    long longValue() throws IOException;

    float floatValue() throws IOException;

    double doubleValue() throws IOException;

    boolean booleanValue() throws IOException;

    byte[] binaryValue() throws IOException;

    void close();
}