org.ros.internal.message.new_style.MessageContext.java Source code

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Here is the source code for org.ros.internal.message.new_style.MessageContext.java

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/*
 * Copyright (C) 2011 Google Inc.
 * 
 * Licensed 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.ros.internal.message.new_style;

import java.util.Collections;
import java.util.List;
import java.util.Map;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

/**
 * @author damonkohler@google.com (Damon Kohler)
 */
class MessageContext {

    private final String name;
    private final Map<String, Field> fields;
    private final List<Field> orderedFields;

    MessageContext(String name) {
        this.name = name;
        this.fields = Maps.newConcurrentMap();
        this.orderedFields = Lists.newArrayList();
    }

    String getName() {
        return name;
    }

    <T> void addConstantField(String name, FieldType type, T value) {
        ScalarField<T> field = ScalarField.newConstant(name, type, value);
        fields.put(name, field);
        orderedFields.add(field);
    }

    <T> void addConstantListField(String name, FieldType type, List<T> value) {
        ListField<T> field = ListField.newConstant(name, type, value);
        fields.put(name, field);
        orderedFields.add(field);
    }

    void addValueField(String name, FieldType type) {
        ScalarField<?> field = ScalarField.newValue(name, type);
        fields.put(name, field);
        orderedFields.add(field);
    }

    void addValueListField(String name, FieldType type) {
        ListField<?> field = ListField.newValue(name, type);
        fields.put(name, field);
        orderedFields.add(field);
    }

    boolean hasField(String name, FieldType type) {
        return fields.containsKey(name) && fields.get(name).getType().equals(type);
    }

    Field getField(String name) {
        return fields.get(name);
    }

    /**
     * @return the {@link List} of {@link ScalarField}s in the order they were added
     */
    List<Field> getFields() {
        return Collections.unmodifiableList(orderedFields);
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((fields == null) ? 0 : fields.hashCode());
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        result = prime * result + ((orderedFields == null) ? 0 : orderedFields.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        MessageContext other = (MessageContext) obj;
        if (fields == null) {
            if (other.fields != null)
                return false;
        } else if (!fields.equals(other.fields))
            return false;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        if (orderedFields == null) {
            if (other.orderedFields != null)
                return false;
        } else if (!orderedFields.equals(other.orderedFields))
            return false;
        return true;
    }
}