/**
 * 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.camel.builder;

import java.util.Map;

import org.apache.camel.Expression;
import org.apache.camel.builder.xml.Namespaces;
import org.apache.camel.model.ExpressionNode;
import org.apache.camel.model.language.ExpressionDefinition;

/**
 * Represents an expression clause within the DSL which when the expression is
 * complete the clause continues to another part of the DSL
 * 
 * @version $Revision$
 */
public class ExpressionClause<T> extends ExpressionDefinition {
    private ExpressionClauseSupport<T> delegate;

    public ExpressionClause(T result) {
        this.delegate = new ExpressionClauseSupport<T>(result);
    }

    public static <T extends ExpressionNode> ExpressionClause<T> createAndSetExpression(T result) {
        ExpressionClause<T> clause = new ExpressionClause<T>(result);
        result.setExpression(clause);
        return clause;
    }

    // Helper expressions
    // -------------------------------------------------------------------------

    /**
     * Specify an {@link Expression} instance
     */
    public T expression(Expression expression) {
        return delegate.expression(expression);
    }

    /**
     * Specify the constant expression value
     */
    public T constant(Object value) {
        return delegate.constant(value);
    }

    /**
     * An expression of the exchange
     */
    public T exchange() {
        return delegate.exchange();
    }

    /**
     * An expression of an inbound message
     */
    public T inMessage() {
        return delegate.inMessage();
    }

    /**
     * An expression of an inbound message
     */
    public T outMessage() {
        return delegate.outMessage();
    }

    /**
     * An expression of an inbound message body
     */
    public T body() {
        return delegate.body();
    }

    /**
     * An expression of an inbound message body converted to the expected type
     */
    public T body(Class<?> expectedType) {
        return delegate.body(expectedType);
    }

    /**
     * An expression of an outbound message body
     */
    public T outBody() {
        return delegate.outBody();
    }

    /**
     * An expression of an outbound message body converted to the expected type
     */
    public T outBody(Class expectedType) {
        return delegate.outBody(expectedType);
    }

    /**
     * An expression of an inbound message header of the given name
     */
    public T header(String name) {
        return delegate.header(name);
    }

    /**
     * An expression of the inbound headers
     */
    public T headers() {
        return delegate.headers();
    }

    /**
     * An expression of an outbound message header of the given name
     */
    public T outHeader(String name) {
        return delegate.outHeader(name);
    }

    /**
     * An expression of the outbound headers
     */
    public T outHeaders() {
        return delegate.outHeaders();
    }

    /**
     * An expression of an exchange property of the given name
     */
    public T property(String name) {
        return delegate.property(name);
    }

    /**
     * An expression of the exchange properties
     */
    public T properties() {
        return delegate.properties();
    }

    // Languages
    // -------------------------------------------------------------------------

    /**
     * Evaluates an expression using the <a
     * href="http://camel.apache.org/bean-language.html>bean language</a>
     * which basically means the bean is invoked to determine the expression
     * value.
     * 
     * @param bean the name of the bean looked up the registry
     * @return the builder to continue processing the DSL
     */
    public T method(String bean) {
        return delegate.method(bean);
    }
    
    /**
     * Evaluates an expression using the <a
     * href="http://camel.apache.org/bean-language.html>bean language</a>
     * which basically means the bean is invoked to determine the expression
     * value.
     *
     * @param instance the instance of the bean
     * @return the builder to continue processing the DSL
     */
    public T method(Object instance) {
        return delegate.method(instance);
    }

    /**
     * Evaluates an expression using the <a
     * href="http://camel.apache.org/bean-language.html>bean language</a>
     * which basically means the bean is invoked to determine the expression
     * value.
     * 
     * @param beanType the Class of the bean which we want to invoke
     * @return the builder to continue processing the DSL
     */
    public T method(Class<?> beanType) {
        return delegate.method(beanType);
    }

    /**
     * Evaluates an expression using the <a
     * href="http://camel.apache.org/bean-language.html>bean language</a>
     * which basically means the bean is invoked to determine the expression
     * value.
     * 
     * @param bean the name of the bean looked up the registry
     * @param method the name of the method to invoke on the bean
     * @return the builder to continue processing the DSL
     */
    public T method(String bean, String method) {
        return delegate.method(bean, method);
    }
    
    /**
     * Evaluates an expression using the <a
     * href="http://camel.apache.org/bean-language.html>bean language</a>
     * which basically means the bean is invoked to determine the expression
     * value.
     *
     * @param instance the instance of the bean
     * @param method the name of the method to invoke on the bean
     * @return the builder to continue processing the DSL
     */
    public T method(Object instance, String method) {
        return delegate.method(instance, method);
    }

    /**
     * Evaluates an expression using the <a
     * href="http://camel.apache.org/bean-language.html>bean language</a>
     * which basically means the bean is invoked to determine the expression
     * value.
     * 
     * @param beanType the Class of the bean which we want to invoke
     * @param method the name of the method to invoke on the bean
     * @return the builder to continue processing the DSL
     */
    public T method(Class<?> beanType, String method) {
        return delegate.method(beanType, method);
    }

    /**
     * Evaluates the <a href="http://camel.apache.org/el.html">EL
     * Language from JSP and JSF</a> using the <a
     * href="http://camel.apache.org/juel.html">JUEL library</a>
     * 
     * @param text the expression to be evaluated
     * @return the builder to continue processing the DSL
     */
    public T el(String text) {
        return delegate.el(text);
    }

    /**
     * Evaluates a <a href="http://camel.apache.org/groovy.html">Groovy
     * expression</a>
     * 
     * @param text the expression to be evaluated
     * @return the builder to continue processing the DSL
     */
    public T groovy(String text) {
        return delegate.groovy(text);
    }

    /**
     * Evaluates a <a
     * href="http://camel.apache.org/java-script.html">JavaScript
     * expression</a>
     * 
     * @param text the expression to be evaluated
     * @return the builder to continue processing the DSL
     */
    public T javaScript(String text) {
        return delegate.javaScript(text);
    }

    /**
     * Evaluates a <a href="http://commons.apache.org/jxpath/">JXPath expression</a>
     * 
     * @param text the expression to be evaluated
     * @return the builder to continue processing the DSL
     */
    public T jxpath(String text) {
        return delegate.jxpath(text);
    }

    /**
     * Evaluates an <a href="http://camel.apache.org/ognl.html">OGNL
     * expression</a>
     * 
     * @param text the expression to be evaluated
     * @return the builder to continue processing the DSL
     */
    public T ognl(String text) {
        return delegate.ognl(text);
    }

    /**
     * Evaluates a <a href="http://camel.apache.org/mvel.html">MVEL
     * expression</a>
     *
     * @param text the expression to be evaluated
     * @return the builder to continue processing the DSL
     */
    public T mvel(String text) {
        return delegate.mvel(text);
    }

    /**
     * Evaluates a <a href="http://camel.apache.org/php.html">PHP
     * expression</a>
     * 
     * @param text the expression to be evaluated
     * @return the builder to continue processing the DSL
     */
    public T php(String text) {
        return delegate.php(text);
    }

    /**
     * Evaluates a <a href="http://camel.apache.org/python.html">Python
     * expression</a>
     * 
     * @param text the expression to be evaluated
     * @return the builder to continue processing the DSL
     */
    public T python(String text) {
        return delegate.python(text);
    }

    /**
     * Evaluates a <a href="http://camel.apache.org/ruby.html">Ruby
     * expression</a>
     * 
     * @param text the expression to be evaluated
     * @return the builder to continue processing the DSL
     */
    public T ruby(String text) {
        return delegate.ruby(text);
    }

    /**
     * Evaluates an <a href="http://camel.apache.org/sql.html">SQL
     * expression</a>
     * 
     * @param text the expression to be evaluated
     * @return the builder to continue processing the DSL
     */
    public T sql(String text) {
        return delegate.sql(text);
    }

    /**
     * Evaluates a <a href="http://camel.apache.org/simple.html">Simple
     * expression</a>
     * 
     * @param text the expression to be evaluated
     * @return the builder to continue processing the DSL
     */
    public T simple(String text) {
        return delegate.simple(text);
    }

    /**
     * Evaluates an <a href="http://camel.apache.org/xpath.html">XPath
     * expression</a>
     * 
     * @param text the expression to be evaluated
     * @return the builder to continue processing the DSL
     */
    public T xpath(String text) {
        return delegate.xpath(text);
    }

    /**
     * Evaluates an <a href="http://camel.apache.org/xpath.html">XPath
     * expression</a> with the specified result type
     * 
     * @param text the expression to be evaluated
     * @param resultType the return type expected by the expression
     * @return the builder to continue processing the DSL
     */
    public T xpath(String text, Class<?> resultType) {
        return delegate.xpath(text, resultType);
    }

    /**
     * Evaluates an <a href="http://camel.apache.org/xpath.html">XPath
     * expression</a> with the specified result type and set of namespace
     * prefixes and URIs
     * 
     * @param text the expression to be evaluated
     * @param resultType the return type expected by the expression
     * @param namespaces the namespace prefix and URIs to use
     * @return the builder to continue processing the DSL
     */
    public T xpath(String text, Class<?> resultType, Namespaces namespaces) {
        return delegate.xpath(text, resultType, namespaces);
    }

    /**
     * Evaluates an <a href="http://camel.apache.org/xpath.html">XPath
     * expression</a> with the specified result type and set of namespace
     * prefixes and URIs
     * 
     * @param text the expression to be evaluated
     * @param resultType the return type expected by the expression
     * @param namespaces the namespace prefix and URIs to use
     * @return the builder to continue processing the DSL
     */
    public T xpath(String text, Class<?> resultType, Map<String, String> namespaces) {
        return delegate.xpath(text, resultType, namespaces);
    }

    /**
     * Evaluates an <a href="http://camel.apache.org/xpath.html">XPath
     * expression</a> with the specified set of namespace prefixes and URIs
     * 
     * @param text the expression to be evaluated
     * @param namespaces the namespace prefix and URIs to use
     * @return the builder to continue processing the DSL
     */
    public T xpath(String text, Namespaces namespaces) {
        return delegate.xpath(text, namespaces);
    }

    /**
     * Evaluates an <a href="http://camel.apache.org/xpath.html">XPath
     * expression</a> with the specified set of namespace prefixes and URIs
     * 
     * @param text the expression to be evaluated
     * @param namespaces the namespace prefix and URIs to use
     * @return the builder to continue processing the DSL
     */
    public T xpath(String text, Map<String, String> namespaces) {
        return delegate.xpath(text, namespaces);
    }

    /**
     * Evaluates an <a
     * href="http://camel.apache.org/xquery.html">XQuery expression</a>
     * 
     * @param text the expression to be evaluated
     * @return the builder to continue processing the DSL
     */
    public T xquery(String text) {
        return delegate.xquery(text);
    }

    /**
     * Evaluates an <a
     * href="http://camel.apache.org/xquery.html">XQuery expression</a>
     * with the specified result type
     * 
     * @param text the expression to be evaluated
     * @param resultType the return type expected by the expression
     * @return the builder to continue processing the DSL
     */
    public T xquery(String text, Class<?> resultType) {
        return delegate.xquery(text, resultType);
    }

    /**
     * Evaluates an <a
     * href="http://camel.apache.org/xquery.html">XQuery expression</a>
     * with the specified result type and set of namespace prefixes and URIs
     * 
     * @param text the expression to be evaluated
     * @param resultType the return type expected by the expression
     * @param namespaces the namespace prefix and URIs to use
     * @return the builder to continue processing the DSL
     */
    public T xquery(String text, Class<?> resultType, Namespaces namespaces) {
        return delegate.xquery(text, resultType, namespaces);
    }

    /**
     * Evaluates an <a
     * href="http://camel.apache.org/xquery.html">XQuery expression</a>
     * with the specified result type and set of namespace prefixes and URIs
     * 
     * @param text the expression to be evaluated
     * @param resultType the return type expected by the expression
     * @param namespaces the namespace prefix and URIs to use
     * @return the builder to continue processing the DSL
     */
    public T xquery(String text, Class<?> resultType, Map<String, String> namespaces) {
        return delegate.xquery(text, resultType, namespaces);
    }

    /**
     * Evaluates an <a
     * href="http://camel.apache.org/xquery.html">XQuery expression</a>
     * with the specified set of namespace prefixes and URIs
     * 
     * @param text the expression to be evaluated
     * @param namespaces the namespace prefix and URIs to use
     * @return the builder to continue processing the DSL
     */
    public T xquery(String text, Namespaces namespaces) {
        return delegate.xquery(text, namespaces);
    }

    /**
     * Evaluates an <a
     * href="http://camel.apache.org/xquery.html">XQuery expression</a>
     * with the specified set of namespace prefixes and URIs
     * 
     * @param text the expression to be evaluated
     * @param namespaces the namespace prefix and URIs to use
     * @return the builder to continue processing the DSL
     */
    public T xquery(String text, Map<String, String> namespaces) {
        return delegate.xquery(text, namespaces);
    }

    /**
     * Evaluates a given language name with the expression text
     * 
     * @param language the name of the language
     * @param expression the expression in the given language
     * @return the builder to continue processing the DSL
     */
    public T language(String language, String expression) {
        return delegate.language(language, expression);
    }

    // Properties
    // -------------------------------------------------------------------------


    @Override
    public String getLanguage() {
        return delegate.getLanguage();
    }

    @Override
    public String getExpression() {
        return delegate.getExpression();
    }

    @Override
    public void setExpression(String expression) {
        delegate.setExpression(expression);
    }

    @Override
    public Expression getExpressionValue() {
        return delegate.getExpressionValue();
    }

    @Override
    protected void setExpressionValue(Expression expressionValue) {
        delegate.setExpressionValue(expressionValue);
    }

    @Override
    public ExpressionDefinition getExpressionType() {
        return delegate.getExpressionType();
    }

    @Override
    protected void setExpressionType(ExpressionDefinition expressionType) {
        delegate.setExpressionType(expressionType);
    }
}
