/*-
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.sling.query.impl.selector.parser;

import java.util.ArrayList;
import java.util.List;

public class ParserContext {
    private final List<Selector> selectors = new ArrayList<Selector>();

    private final List<SelectorSegment> segments = new ArrayList<SelectorSegment>();

    private final List<Attribute> attributes = new ArrayList<Attribute>();

    private final List<Modifier> modifiers = new ArrayList<Modifier>();

    private char hierarchyOperator;

    private State state = State.START;

    private StringBuilder builder = new StringBuilder();

    private String type;

    private String name;

    private String attributeKey;

    private String attributeOperator;

    private String attributeValue;

    private String currentModifierName;

    private int parenthesesCount = 0;

    List<Attribute> getAttributes() {
        return attributes;
    }

    List<Modifier> getModifiers() {
        return modifiers;
    }

    String getType() {
        return type;
    }

    String getName() {
        return name;
    }

    char getHierarchyOperator() {
        return hierarchyOperator;
    }

    public State getState() {
        return state;
    }

    void increaseParentheses() {
        parenthesesCount++;
    }

    int decreaseParentheses() {
        return --parenthesesCount;
    }

    void setType() {
        type = builder.toString();
        builder = new StringBuilder();
    }

    void setName() {
        name = builder.toString();
        builder = new StringBuilder();
    }

    void setAttributeKey() {
        attributeKey = builder.toString();
        builder = new StringBuilder();
    }

    void setAttributeOperator() {
        attributeOperator = builder.toString();
        builder = new StringBuilder();
    }

    void setAttributeValue() {
        attributeValue = builder.toString();
        builder = new StringBuilder();
    }

    void addAttribute() {
        attributes.add(new Attribute(attributeKey, attributeOperator, attributeValue));
        attributeKey = null;
        attributeOperator = null;
        attributeValue = null;
    }

    void setModifierName() {
        currentModifierName = builder.toString();
        builder = new StringBuilder();
    }

    void addModifier() {
        Modifier modifier;
        if (currentModifierName == null) {
            modifier = new Modifier(builder.toString(), null);
        } else {
            modifier = new Modifier(currentModifierName, builder.toString());
            currentModifierName = null;
        }
        modifiers.add(modifier);
        builder = new StringBuilder();
    }

    void setState(State state) {
        this.state = state;
    }

    void setHierarchyOperator(char hierarchyOperator) {
        this.hierarchyOperator = hierarchyOperator;
    }

    void finishSelectorSegment() {
        segments.add(new SelectorSegment(this, segments.isEmpty()));
        attributes.clear();
        modifiers.clear();
        hierarchyOperator = ' ';
        type = null;
        name = null;
    }

    void finishSelector() {
        selectors.add(new Selector(segments));
        segments.clear();
    }

    void append(char c) {
        builder.append(c);
    }

    public List<Selector> getSelectors() {
        return selectors;
    }
}