com.cognifide.slice.core.internal.execution.ExecutionContextStackImpl.java Source code

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Here is the source code for com.cognifide.slice.core.internal.execution.ExecutionContextStackImpl.java

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/*-
 * #%L
 * Slice - Core
 * %%
 * Copyright (C) 2012 Cognifide Limited
 * %%
 * 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.
 * #L%
 */

package com.cognifide.slice.core.internal.execution;

import java.util.Stack;

import org.apache.commons.lang.StringUtils;

import com.cognifide.slice.api.exceptions.InvalidExecutionContextException;
import com.cognifide.slice.api.execution.ExecutionContextStack;
import com.cognifide.slice.api.execution.ExecutionContext;

/**
 * This is internal class, should not be used outside of framework.
 * 
 * @author witoldsz
 */
public final class ExecutionContextStackImpl implements ExecutionContextStack {

    private final Stack<ExecutionContext> items = new Stack<ExecutionContext>();

    private final String rootPath;

    public ExecutionContextStackImpl(final String rootPath) {
        this.rootPath = rootPath;
    }

    @Override
    public ExecutionContext peek() {
        return items.peek();
    }

    @Override
    public void push(final ExecutionContext executionContext) {
        items.push(executionContext);
    }

    @Override
    public ExecutionContext pop() {
        return items.pop();
    }

    @Override
    public int size() {
        return items.size();
    }

    private String getRootPath() {
        return rootPath;
    }

    private boolean isEmpty() {
        return items.isEmpty();
    }

    private String joinPath(final Object... args) {
        return StringUtils.join(args, "/").replace("//", "/");
    }

    @Override
    public String getAbsolutePath(final String path) {
        if (path.charAt(0) == '/') {
            return path;
        }

        if (!path.startsWith("./")) {
            return joinPath(getRootPath(), path);
        }

        if (isEmpty()) {
            throw new InvalidExecutionContextException(
                    "Relative path not allowed on top of ExecutionContext: " + path);
        }

        // remove "./" from path
        return joinPath(peek().getPath(), path.substring(2));
    }

}